1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini tar implementation for busybox
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4 | *
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5 | * Modified to use common extraction code used by ar, cpio, dpkg-deb, dpkg
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6 | * by Glenn McGrath
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7 | *
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8 | * Note, that as of BusyBox-0.43, tar has been completely rewritten from the
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9 | * ground up. It still has remnants of the old code lying about, but it is
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10 | * very different now (i.e., cleaner, less global variables, etc.)
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11 | *
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12 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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13 | *
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14 | * Based in part in the tar implementation in sash
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15 | * Copyright (c) 1999 by David I. Bell
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16 | * Permission is granted to use, distribute, or modify this source,
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17 | * provided that this copyright notice remains intact.
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18 | * Permission to distribute sash derived code under GPL has been granted.
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19 | *
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20 | * Based in part on the tar implementation from busybox-0.28
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21 | * Copyright (C) 1995 Bruce Perens
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22 | *
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23 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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24 | */
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25 | /* TODO: security with -C DESTDIR option can be enhanced.
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26 | * Consider tar file created via:
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27 | * $ tar cvf bug.tar anything.txt
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28 | * $ ln -s /tmp symlink
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29 | * $ tar --append -f bug.tar symlink
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30 | * $ rm symlink
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31 | * $ mkdir symlink
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32 | * $ tar --append -f bug.tar symlink/evil.py
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33 | *
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34 | * This will result in an archive which contains:
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35 | * $ tar --list -f bug.tar
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36 | * anything.txt
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37 | * symlink
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38 | * symlink/evil.py
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39 | *
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40 | * Untarring it puts evil.py in '/tmp' even if the -C DESTDIR is given.
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41 | * This doesn't feel right, and IIRC GNU tar doesn't do that.
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42 | */
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43 |
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44 | //config:config TAR
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45 | //config: bool "tar"
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46 | //config: default y
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47 | //config: help
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48 | //config: tar is an archiving program. It's commonly used with gzip to
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49 | //config: create compressed archives. It's probably the most widely used
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50 | //config: UNIX archive program.
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51 | //config:
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52 | //config:config FEATURE_TAR_CREATE
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53 | //config: bool "Enable archive creation"
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54 | //config: default y
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55 | //config: depends on TAR
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56 | //config: help
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57 | //config: If you enable this option you'll be able to create
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58 | //config: tar archives using the `-c' option.
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59 | //config:
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60 | //config:config FEATURE_TAR_AUTODETECT
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61 | //config: bool "Autodetect compressed tarballs"
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62 | //config: default y
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63 | //config: depends on TAR && (FEATURE_SEAMLESS_Z || FEATURE_SEAMLESS_GZ || FEATURE_SEAMLESS_BZ2 || FEATURE_SEAMLESS_LZMA || FEATURE_SEAMLESS_XZ)
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64 | //config: help
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65 | //config: With this option tar can automatically detect compressed
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66 | //config: tarballs. Currently it works only on files (not pipes etc).
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67 | //config:
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68 | //config:config FEATURE_TAR_FROM
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69 | //config: bool "Enable -X (exclude from) and -T (include from) options)"
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70 | //config: default y
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71 | //config: depends on TAR
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72 | //config: help
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73 | //config: If you enable this option you'll be able to specify
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74 | //config: a list of files to include or exclude from an archive.
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75 | //config:
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76 | //config:config FEATURE_TAR_OLDGNU_COMPATIBILITY
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77 | //config: bool "Support for old tar header format"
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78 | //config: default y
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79 | //config: depends on TAR || DPKG
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80 | //config: help
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81 | //config: This option is required to unpack archives created in
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82 | //config: the old GNU format; help to kill this old format by
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83 | //config: repacking your ancient archives with the new format.
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84 | //config:
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85 | //config:config FEATURE_TAR_OLDSUN_COMPATIBILITY
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86 | //config: bool "Enable untarring of tarballs with checksums produced by buggy Sun tar"
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87 | //config: default y
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88 | //config: depends on TAR || DPKG
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89 | //config: help
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90 | //config: This option is required to unpack archives created by some old
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91 | //config: version of Sun's tar (it was calculating checksum using signed
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92 | //config: arithmetic). It is said to be fixed in newer Sun tar, but "old"
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93 | //config: tarballs still exist.
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94 | //config:
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95 | //config:config FEATURE_TAR_GNU_EXTENSIONS
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96 | //config: bool "Support for GNU tar extensions (long filenames)"
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97 | //config: default y
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98 | //config: depends on TAR || DPKG
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99 | //config: help
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100 | //config: With this option busybox supports GNU long filenames and
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101 | //config: linknames.
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102 | //config:
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103 | //config:config FEATURE_TAR_LONG_OPTIONS
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104 | //config: bool "Enable long options"
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105 | //config: default y
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106 | //config: depends on TAR && LONG_OPTS
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107 | //config: help
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108 | //config: Enable use of long options, increases size by about 400 Bytes
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109 | //config:
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110 | //config:config FEATURE_TAR_TO_COMMAND
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111 | //config: bool "Support for writing to an external program"
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112 | //config: default y
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113 | //config: depends on TAR && FEATURE_TAR_LONG_OPTIONS
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114 | //config: help
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115 | //config: If you enable this option you'll be able to instruct tar to send
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116 | //config: the contents of each extracted file to the standard input of an
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117 | //config: external program.
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118 | //config:
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119 | //config:config FEATURE_TAR_UNAME_GNAME
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120 | //config: bool "Enable use of user and group names"
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121 | //config: default y
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122 | //config: depends on TAR
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123 | //config: help
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124 | //config: Enables use of user and group names in tar. This affects contents
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125 | //config: listings (-t) and preserving permissions when unpacking (-p).
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126 | //config: +200 bytes.
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127 | //config:
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128 | //config:config FEATURE_TAR_NOPRESERVE_TIME
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129 | //config: bool "Enable -m (do not preserve time) option"
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130 | //config: default y
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131 | //config: depends on TAR
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132 | //config: help
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133 | //config: With this option busybox supports GNU tar -m
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134 | //config: (do not preserve time) option.
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135 | //config:
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136 | //config:config FEATURE_TAR_SELINUX
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137 | //config: bool "Support for extracting SELinux labels"
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138 | //config: default n
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139 | //config: depends on TAR && SELINUX
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140 | //config: help
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141 | //config: With this option busybox supports restoring SELinux labels
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142 | //config: when extracting files from tar archives.
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143 |
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144 | //applet:IF_TAR(APPLET(tar, BB_DIR_BIN, BB_SUID_DROP))
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145 | //kbuild:lib-$(CONFIG_TAR) += tar.o
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146 |
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147 | #include <fnmatch.h>
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148 | #include "libbb.h"
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149 | #include "common_bufsiz.h"
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150 | #include "bb_archive.h"
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151 | /* FIXME: Stop using this non-standard feature */
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152 | #ifndef FNM_LEADING_DIR
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153 | # define FNM_LEADING_DIR 0
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154 | #endif
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155 |
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156 | #if 0
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157 | # define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__)
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158 | #else
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159 | # define DBG(...) ((void)0)
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160 | #endif
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161 | #define DBG_OPTION_PARSING 0
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162 |
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163 |
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164 | #define block_buf bb_common_bufsiz1
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165 | #define INIT_G() do { setup_common_bufsiz(); } while (0)
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166 |
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167 |
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168 | #if ENABLE_FEATURE_TAR_CREATE
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169 |
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170 | /*
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171 | ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
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172 | ** the only functions that deal with the HardLinkInfo structure.
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173 | ** Even these functions use the xxxHardLinkInfo() functions.
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174 | */
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175 | typedef struct HardLinkInfo {
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176 | struct HardLinkInfo *next; /* Next entry in list */
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177 | dev_t dev; /* Device number */
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178 | ino_t ino; /* Inode number */
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179 | // short linkCount; /* (Hard) Link Count */
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180 | char name[1]; /* Start of filename (must be last) */
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181 | } HardLinkInfo;
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182 |
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183 | /* Some info to be carried along when creating a new tarball */
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184 | typedef struct TarBallInfo {
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185 | int tarFd; /* Open-for-write file descriptor
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186 | * for the tarball */
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187 | int verboseFlag; /* Whether to print extra stuff or not */
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188 | const llist_t *excludeList; /* List of files to not include */
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189 | HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
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190 | HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
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191 | //TODO: save only st_dev + st_ino
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192 | struct stat tarFileStatBuf; /* Stat info for the tarball, letting
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193 | * us know the inode and device that the
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194 | * tarball lives, so we can avoid trying
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195 | * to include the tarball into itself */
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196 | } TarBallInfo;
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197 |
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198 | /* A nice enum with all the possible tar file content types */
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199 | enum {
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200 | REGTYPE = '0', /* regular file */
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201 | REGTYPE0 = '\0', /* regular file (ancient bug compat) */
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202 | LNKTYPE = '1', /* hard link */
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203 | SYMTYPE = '2', /* symbolic link */
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204 | CHRTYPE = '3', /* character special */
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205 | BLKTYPE = '4', /* block special */
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206 | DIRTYPE = '5', /* directory */
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207 | FIFOTYPE = '6', /* FIFO special */
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208 | CONTTYPE = '7', /* reserved */
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209 | GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
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210 | GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
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211 | };
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212 |
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213 | /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
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214 | static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr,
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215 | struct stat *statbuf,
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216 | const char *fileName)
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217 | {
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218 | /* Note: hlInfoHeadPtr can never be NULL! */
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219 | HardLinkInfo *hlInfo;
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220 |
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221 | hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName));
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222 | hlInfo->next = *hlInfoHeadPtr;
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223 | *hlInfoHeadPtr = hlInfo;
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224 | hlInfo->dev = statbuf->st_dev;
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225 | hlInfo->ino = statbuf->st_ino;
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226 | // hlInfo->linkCount = statbuf->st_nlink;
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227 | strcpy(hlInfo->name, fileName);
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228 | }
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229 |
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230 | static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr)
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231 | {
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232 | HardLinkInfo *hlInfo;
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233 | HardLinkInfo *hlInfoNext;
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234 |
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235 | if (hlInfoHeadPtr) {
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236 | hlInfo = *hlInfoHeadPtr;
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237 | while (hlInfo) {
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238 | hlInfoNext = hlInfo->next;
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239 | free(hlInfo);
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240 | hlInfo = hlInfoNext;
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241 | }
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242 | *hlInfoHeadPtr = NULL;
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243 | }
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244 | }
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245 |
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246 | /* Might be faster (and bigger) if the dev/ino were stored in numeric order ;) */
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247 | static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf)
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248 | {
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249 | while (hlInfo) {
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250 | if (statbuf->st_ino == hlInfo->ino
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251 | && statbuf->st_dev == hlInfo->dev
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252 | ) {
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253 | DBG("found hardlink:'%s'", hlInfo->name);
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254 | break;
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255 | }
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256 | hlInfo = hlInfo->next;
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257 | }
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258 | return hlInfo;
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259 | }
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260 |
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261 | /* Put an octal string into the specified buffer.
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262 | * The number is zero padded and possibly null terminated.
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263 | * Stores low-order bits only if whole value does not fit. */
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264 | static void putOctal(char *cp, int len, off_t value)
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265 | {
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266 | char tempBuffer[sizeof(off_t)*3 + 1];
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267 | char *tempString = tempBuffer;
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268 | int width;
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269 |
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270 | width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value);
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271 | tempString += (width - len);
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272 |
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273 | /* If string has leading zeroes, we can drop one */
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274 | /* and field will have trailing '\0' */
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275 | /* (increases chances of compat with other tars) */
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276 | if (tempString[0] == '0')
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277 | tempString++;
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278 |
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279 | /* Copy the string to the field */
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280 | memcpy(cp, tempString, len);
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281 | }
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282 | #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
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283 |
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284 | static void chksum_and_xwrite(int fd, struct tar_header_t* hp)
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285 | {
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286 | /* POSIX says that checksum is done on unsigned bytes
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287 | * (Sun and HP-UX gets it wrong... more details in
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288 | * GNU tar source) */
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289 | const unsigned char *cp;
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290 | int chksum, size;
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291 |
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292 | strcpy(hp->magic, "ustar ");
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293 |
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294 | /* Calculate and store the checksum (i.e., the sum of all of the bytes of
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295 | * the header). The checksum field must be filled with blanks for the
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296 | * calculation. The checksum field is formatted differently from the
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297 | * other fields: it has 6 digits, a null, then a space -- rather than
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298 | * digits, followed by a null like the other fields... */
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299 | memset(hp->chksum, ' ', sizeof(hp->chksum));
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300 | cp = (const unsigned char *) hp;
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301 | chksum = 0;
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302 | size = sizeof(*hp);
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303 | do { chksum += *cp++; } while (--size);
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304 | putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum);
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305 |
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306 | /* Now write the header out to disk */
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307 | xwrite(fd, hp, sizeof(*hp));
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308 | }
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309 |
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310 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
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311 | static void writeLongname(int fd, int type, const char *name, int dir)
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312 | {
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313 | static const struct {
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314 | char mode[8]; /* 100-107 */
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315 | char uid[8]; /* 108-115 */
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316 | char gid[8]; /* 116-123 */
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317 | char size[12]; /* 124-135 */
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318 | char mtime[12]; /* 136-147 */
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319 | } prefilled = {
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320 | "0000000",
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321 | "0000000",
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322 | "0000000",
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323 | "00000000000",
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324 | "00000000000",
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325 | };
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326 | struct tar_header_t header;
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327 | int size;
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328 |
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329 | dir = !!dir; /* normalize: 0/1 */
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330 | size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
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331 | /* + dir: account for possible '/' */
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332 |
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333 | memset(&header, 0, sizeof(header));
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334 | strcpy(header.name, "././@LongLink");
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335 | memcpy(header.mode, prefilled.mode, sizeof(prefilled));
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336 | PUT_OCTAL(header.size, size);
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337 | header.typeflag = type;
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338 | chksum_and_xwrite(fd, &header);
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339 |
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340 | /* Write filename[/] and pad the block. */
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341 | /* dir=0: writes 'name<NUL>', pads */
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342 | /* dir=1: writes 'name', writes '/<NUL>', pads */
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343 | dir *= 2;
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344 | xwrite(fd, name, size - dir);
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345 | xwrite(fd, "/", dir);
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346 | size = (-size) & (TAR_BLOCK_SIZE-1);
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347 | memset(&header, 0, size);
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348 | xwrite(fd, &header, size);
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349 | }
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350 | #endif
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351 |
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352 | /* Write out a tar header for the specified file/directory/whatever */
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353 | static int writeTarHeader(struct TarBallInfo *tbInfo,
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354 | const char *header_name, const char *fileName, struct stat *statbuf)
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355 | {
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356 | struct tar_header_t header;
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357 |
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358 | memset(&header, 0, sizeof(header));
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359 |
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360 | strncpy(header.name, header_name, sizeof(header.name));
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361 |
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362 | /* POSIX says to mask mode with 07777. */
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363 | PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
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364 | PUT_OCTAL(header.uid, statbuf->st_uid);
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365 | PUT_OCTAL(header.gid, statbuf->st_gid);
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366 | memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
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367 | /* users report that files with negative st_mtime cause trouble, so: */
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368 | PUT_OCTAL(header.mtime, statbuf->st_mtime >= 0 ? statbuf->st_mtime : 0);
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369 |
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370 | /* Enter the user and group names */
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371 | safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
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372 | safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
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373 |
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374 | if (tbInfo->hlInfo) {
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375 | /* This is a hard link */
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376 | header.typeflag = LNKTYPE;
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377 | strncpy(header.linkname, tbInfo->hlInfo->name,
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378 | sizeof(header.linkname));
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379 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
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380 | /* Write out long linkname if needed */
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381 | if (header.linkname[sizeof(header.linkname)-1])
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382 | writeLongname(tbInfo->tarFd, GNULONGLINK,
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383 | tbInfo->hlInfo->name, 0);
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384 | #endif
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385 | } else if (S_ISLNK(statbuf->st_mode)) {
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386 | char *lpath = xmalloc_readlink_or_warn(fileName);
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387 | if (!lpath)
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388 | return FALSE;
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389 | header.typeflag = SYMTYPE;
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390 | strncpy(header.linkname, lpath, sizeof(header.linkname));
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391 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
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392 | /* Write out long linkname if needed */
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393 | if (header.linkname[sizeof(header.linkname)-1])
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394 | writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
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395 | #else
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396 | /* If it is larger than 100 bytes, bail out */
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397 | if (header.linkname[sizeof(header.linkname)-1]) {
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398 | free(lpath);
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399 | bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
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400 | return FALSE;
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401 | }
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402 | #endif
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403 | free(lpath);
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404 | } else if (S_ISDIR(statbuf->st_mode)) {
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405 | header.typeflag = DIRTYPE;
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406 | /* Append '/' only if there is a space for it */
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407 | if (!header.name[sizeof(header.name)-1])
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408 | header.name[strlen(header.name)] = '/';
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409 | } else if (S_ISCHR(statbuf->st_mode)) {
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410 | header.typeflag = CHRTYPE;
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411 | PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
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412 | PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
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413 | } else if (S_ISBLK(statbuf->st_mode)) {
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---|
414 | header.typeflag = BLKTYPE;
|
---|
415 | PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
|
---|
416 | PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
|
---|
417 | } else if (S_ISFIFO(statbuf->st_mode)) {
|
---|
418 | header.typeflag = FIFOTYPE;
|
---|
419 | } else if (S_ISREG(statbuf->st_mode)) {
|
---|
420 | /* header.size field is 12 bytes long */
|
---|
421 | /* Does octal-encoded size fit? */
|
---|
422 | uoff_t filesize = statbuf->st_size;
|
---|
423 | if (sizeof(filesize) <= 4
|
---|
424 | || filesize <= (uoff_t)0777777777777LL
|
---|
425 | ) {
|
---|
426 | PUT_OCTAL(header.size, filesize);
|
---|
427 | }
|
---|
428 | /* Does base256-encoded size fit?
|
---|
429 | * It always does unless off_t is wider than 64 bits.
|
---|
430 | */
|
---|
431 | else if (ENABLE_FEATURE_TAR_GNU_EXTENSIONS
|
---|
432 | #if ULLONG_MAX > 0xffffffffffffffffLL /* 2^64-1 */
|
---|
433 | && (filesize <= 0x3fffffffffffffffffffffffLL)
|
---|
434 | #endif
|
---|
435 | ) {
|
---|
436 | /* GNU tar uses "base-256 encoding" for very large numbers.
|
---|
437 | * Encoding is binary, with highest bit always set as a marker
|
---|
438 | * and sign in next-highest bit:
|
---|
439 | * 80 00 .. 00 - zero
|
---|
440 | * bf ff .. ff - largest positive number
|
---|
441 | * ff ff .. ff - minus 1
|
---|
442 | * c0 00 .. 00 - smallest negative number
|
---|
443 | */
|
---|
444 | char *p8 = header.size + sizeof(header.size);
|
---|
445 | do {
|
---|
446 | *--p8 = (uint8_t)filesize;
|
---|
447 | filesize >>= 8;
|
---|
448 | } while (p8 != header.size);
|
---|
449 | *p8 |= 0x80;
|
---|
450 | } else {
|
---|
451 | bb_error_msg_and_die("can't store file '%s' "
|
---|
452 | "of size %"OFF_FMT"u, aborting",
|
---|
453 | fileName, statbuf->st_size);
|
---|
454 | }
|
---|
455 | header.typeflag = REGTYPE;
|
---|
456 | } else {
|
---|
457 | bb_error_msg("%s: unknown file type", fileName);
|
---|
458 | return FALSE;
|
---|
459 | }
|
---|
460 |
|
---|
461 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
|
---|
462 | /* Write out long name if needed */
|
---|
463 | /* (we, like GNU tar, output long linkname *before* long name) */
|
---|
464 | if (header.name[sizeof(header.name)-1])
|
---|
465 | writeLongname(tbInfo->tarFd, GNULONGNAME,
|
---|
466 | header_name, S_ISDIR(statbuf->st_mode));
|
---|
467 | #endif
|
---|
468 |
|
---|
469 | /* Now write the header out to disk */
|
---|
470 | chksum_and_xwrite(tbInfo->tarFd, &header);
|
---|
471 |
|
---|
472 | /* Now do the verbose thing (or not) */
|
---|
473 | if (tbInfo->verboseFlag) {
|
---|
474 | FILE *vbFd = stdout;
|
---|
475 |
|
---|
476 | /* If archive goes to stdout, verbose goes to stderr */
|
---|
477 | if (tbInfo->tarFd == STDOUT_FILENO)
|
---|
478 | vbFd = stderr;
|
---|
479 | /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */
|
---|
480 | /* We don't have such excesses here: for us "v" == "vv" */
|
---|
481 | /* '/' is probably a GNUism */
|
---|
482 | fprintf(vbFd, "%s%s\n", header_name,
|
---|
483 | S_ISDIR(statbuf->st_mode) ? "/" : "");
|
---|
484 | }
|
---|
485 |
|
---|
486 | return TRUE;
|
---|
487 | }
|
---|
488 |
|
---|
489 | #if ENABLE_FEATURE_TAR_FROM
|
---|
490 | static int exclude_file(const llist_t *excluded_files, const char *file)
|
---|
491 | {
|
---|
492 | while (excluded_files) {
|
---|
493 | if (excluded_files->data[0] == '/') {
|
---|
494 | if (fnmatch(excluded_files->data, file,
|
---|
495 | FNM_PATHNAME | FNM_LEADING_DIR) == 0)
|
---|
496 | return 1;
|
---|
497 | } else {
|
---|
498 | const char *p;
|
---|
499 |
|
---|
500 | for (p = file; p[0] != '\0'; p++) {
|
---|
501 | if ((p == file || p[-1] == '/')
|
---|
502 | && p[0] != '/'
|
---|
503 | && fnmatch(excluded_files->data, p,
|
---|
504 | FNM_PATHNAME | FNM_LEADING_DIR) == 0
|
---|
505 | ) {
|
---|
506 | return 1;
|
---|
507 | }
|
---|
508 | }
|
---|
509 | }
|
---|
510 | excluded_files = excluded_files->link;
|
---|
511 | }
|
---|
512 |
|
---|
513 | return 0;
|
---|
514 | }
|
---|
515 | #else
|
---|
516 | # define exclude_file(excluded_files, file) 0
|
---|
517 | #endif
|
---|
518 |
|
---|
519 | static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statbuf,
|
---|
520 | void *userData, int depth UNUSED_PARAM)
|
---|
521 | {
|
---|
522 | struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
|
---|
523 | const char *header_name;
|
---|
524 | int inputFileFd = -1;
|
---|
525 |
|
---|
526 | DBG("writeFileToTarball('%s')", fileName);
|
---|
527 |
|
---|
528 | /* Strip leading '/' and such (must be before memorizing hardlink's name) */
|
---|
529 | header_name = strip_unsafe_prefix(fileName);
|
---|
530 |
|
---|
531 | if (header_name[0] == '\0')
|
---|
532 | return TRUE;
|
---|
533 |
|
---|
534 | /* It is against the rules to archive a socket */
|
---|
535 | if (S_ISSOCK(statbuf->st_mode)) {
|
---|
536 | bb_error_msg("%s: socket ignored", fileName);
|
---|
537 | return TRUE;
|
---|
538 | }
|
---|
539 |
|
---|
540 | /*
|
---|
541 | * Check to see if we are dealing with a hard link.
|
---|
542 | * If so -
|
---|
543 | * Treat the first occurance of a given dev/inode as a file while
|
---|
544 | * treating any additional occurances as hard links. This is done
|
---|
545 | * by adding the file information to the HardLinkInfo linked list.
|
---|
546 | */
|
---|
547 | tbInfo->hlInfo = NULL;
|
---|
548 | if (!S_ISDIR(statbuf->st_mode) && statbuf->st_nlink > 1) {
|
---|
549 | DBG("'%s': st_nlink > 1", header_name);
|
---|
550 | tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
|
---|
551 | if (tbInfo->hlInfo == NULL) {
|
---|
552 | DBG("'%s': addHardLinkInfo", header_name);
|
---|
553 | addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name);
|
---|
554 | }
|
---|
555 | }
|
---|
556 |
|
---|
557 | /* It is a bad idea to store the archive we are in the process of creating,
|
---|
558 | * so check the device and inode to be sure that this particular file isn't
|
---|
559 | * the new tarball */
|
---|
560 | if (tbInfo->tarFileStatBuf.st_dev == statbuf->st_dev
|
---|
561 | && tbInfo->tarFileStatBuf.st_ino == statbuf->st_ino
|
---|
562 | ) {
|
---|
563 | bb_error_msg("%s: file is the archive; skipping", fileName);
|
---|
564 | return TRUE;
|
---|
565 | }
|
---|
566 |
|
---|
567 | if (exclude_file(tbInfo->excludeList, header_name))
|
---|
568 | return SKIP;
|
---|
569 |
|
---|
570 | #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
|
---|
571 | if (strlen(header_name) >= NAME_SIZE) {
|
---|
572 | bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
|
---|
573 | return TRUE;
|
---|
574 | }
|
---|
575 | #endif
|
---|
576 |
|
---|
577 | /* Is this a regular file? */
|
---|
578 | if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
|
---|
579 | /* open the file we want to archive, and make sure all is well */
|
---|
580 | inputFileFd = open_or_warn(fileName, O_RDONLY);
|
---|
581 | if (inputFileFd < 0) {
|
---|
582 | return FALSE;
|
---|
583 | }
|
---|
584 | }
|
---|
585 |
|
---|
586 | /* Add an entry to the tarball */
|
---|
587 | if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
|
---|
588 | return FALSE;
|
---|
589 | }
|
---|
590 |
|
---|
591 | /* If it was a regular file, write out the body */
|
---|
592 | if (inputFileFd >= 0) {
|
---|
593 | size_t readSize;
|
---|
594 | /* Write the file to the archive. */
|
---|
595 | /* We record size into header first, */
|
---|
596 | /* and then write out file. If file shrinks in between, */
|
---|
597 | /* tar will be corrupted. So we don't allow for that. */
|
---|
598 | /* NB: GNU tar 1.16 warns and pads with zeroes */
|
---|
599 | /* or even seeks back and updates header */
|
---|
600 | bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
|
---|
601 | ////off_t readSize;
|
---|
602 | ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
|
---|
603 | ////if (readSize != statbuf->st_size && readSize >= 0) {
|
---|
604 | //// bb_error_msg_and_die("short read from %s, aborting", fileName);
|
---|
605 | ////}
|
---|
606 |
|
---|
607 | /* Check that file did not grow in between? */
|
---|
608 | /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */
|
---|
609 |
|
---|
610 | close(inputFileFd);
|
---|
611 |
|
---|
612 | /* Pad the file up to the tar block size */
|
---|
613 | /* (a few tricks here in the name of code size) */
|
---|
614 | readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1);
|
---|
615 | memset(block_buf, 0, readSize);
|
---|
616 | xwrite(tbInfo->tarFd, block_buf, readSize);
|
---|
617 | }
|
---|
618 |
|
---|
619 | return TRUE;
|
---|
620 | }
|
---|
621 |
|
---|
622 | #if SEAMLESS_COMPRESSION
|
---|
623 | /* Don't inline: vfork scares gcc and pessimizes code */
|
---|
624 | static void NOINLINE vfork_compressor(int tar_fd, const char *gzip)
|
---|
625 | {
|
---|
626 | pid_t gzipPid;
|
---|
627 |
|
---|
628 | // On Linux, vfork never unpauses parent early, although standard
|
---|
629 | // allows for that. Do we want to waste bytes checking for it?
|
---|
630 | # define WAIT_FOR_CHILD 0
|
---|
631 | volatile int vfork_exec_errno = 0;
|
---|
632 | struct fd_pair gzipDataPipe;
|
---|
633 | # if WAIT_FOR_CHILD
|
---|
634 | struct fd_pair gzipStatusPipe;
|
---|
635 | xpiped_pair(gzipStatusPipe);
|
---|
636 | # endif
|
---|
637 | xpiped_pair(gzipDataPipe);
|
---|
638 |
|
---|
639 | signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
|
---|
640 |
|
---|
641 | gzipPid = xvfork();
|
---|
642 |
|
---|
643 | if (gzipPid == 0) {
|
---|
644 | /* child */
|
---|
645 | /* NB: close _first_, then move fds! */
|
---|
646 | close(gzipDataPipe.wr);
|
---|
647 | # if WAIT_FOR_CHILD
|
---|
648 | close(gzipStatusPipe.rd);
|
---|
649 | /* gzipStatusPipe.wr will close only on exec -
|
---|
650 | * parent waits for this close to happen */
|
---|
651 | fcntl(gzipStatusPipe.wr, F_SETFD, FD_CLOEXEC);
|
---|
652 | # endif
|
---|
653 | xmove_fd(gzipDataPipe.rd, 0);
|
---|
654 | xmove_fd(tar_fd, 1);
|
---|
655 | /* exec gzip/bzip2 program/applet */
|
---|
656 | BB_EXECLP(gzip, gzip, "-f", (char *)0);
|
---|
657 | vfork_exec_errno = errno;
|
---|
658 | _exit(EXIT_FAILURE);
|
---|
659 | }
|
---|
660 |
|
---|
661 | /* parent */
|
---|
662 | xmove_fd(gzipDataPipe.wr, tar_fd);
|
---|
663 | close(gzipDataPipe.rd);
|
---|
664 | # if WAIT_FOR_CHILD
|
---|
665 | close(gzipStatusPipe.wr);
|
---|
666 | while (1) {
|
---|
667 | char buf;
|
---|
668 | int n;
|
---|
669 |
|
---|
670 | /* Wait until child execs (or fails to) */
|
---|
671 | n = full_read(gzipStatusPipe.rd, &buf, 1);
|
---|
672 | if (n < 0 /* && errno == EAGAIN */)
|
---|
673 | continue; /* try it again */
|
---|
674 | }
|
---|
675 | close(gzipStatusPipe.rd);
|
---|
676 | # endif
|
---|
677 | if (vfork_exec_errno) {
|
---|
678 | errno = vfork_exec_errno;
|
---|
679 | bb_perror_msg_and_die("can't execute '%s'", gzip);
|
---|
680 | }
|
---|
681 | }
|
---|
682 | #endif /* SEAMLESS_COMPRESSION */
|
---|
683 |
|
---|
684 |
|
---|
685 | #if !SEAMLESS_COMPRESSION
|
---|
686 | /* Do not pass gzip flag to writeTarFile() */
|
---|
687 | #define writeTarFile(tar_fd, verboseFlag, recurseFlags, include, exclude, gzip) \
|
---|
688 | writeTarFile(tar_fd, verboseFlag, recurseFlags, include, exclude)
|
---|
689 | #endif
|
---|
690 | /* gcc 4.2.1 inlines it, making code bigger */
|
---|
691 | static NOINLINE int writeTarFile(int tar_fd, int verboseFlag,
|
---|
692 | int recurseFlags, const llist_t *include,
|
---|
693 | const llist_t *exclude, const char *gzip)
|
---|
694 | {
|
---|
695 | int errorFlag = FALSE;
|
---|
696 | struct TarBallInfo tbInfo;
|
---|
697 |
|
---|
698 | tbInfo.hlInfoHead = NULL;
|
---|
699 | tbInfo.tarFd = tar_fd;
|
---|
700 | tbInfo.verboseFlag = verboseFlag;
|
---|
701 |
|
---|
702 | /* Store the stat info for the tarball's file, so
|
---|
703 | * can avoid including the tarball into itself.... */
|
---|
704 | xfstat(tbInfo.tarFd, &tbInfo.tarFileStatBuf, "can't stat tar file");
|
---|
705 |
|
---|
706 | #if SEAMLESS_COMPRESSION
|
---|
707 | if (gzip)
|
---|
708 | vfork_compressor(tbInfo.tarFd, gzip);
|
---|
709 | #endif
|
---|
710 |
|
---|
711 | tbInfo.excludeList = exclude;
|
---|
712 |
|
---|
713 | /* Read the directory/files and iterate over them one at a time */
|
---|
714 | while (include) {
|
---|
715 | if (!recursive_action(include->data, recurseFlags,
|
---|
716 | writeFileToTarball, writeFileToTarball, &tbInfo, 0)
|
---|
717 | ) {
|
---|
718 | errorFlag = TRUE;
|
---|
719 | }
|
---|
720 | include = include->link;
|
---|
721 | }
|
---|
722 | /* Write two empty blocks to the end of the archive */
|
---|
723 | memset(block_buf, 0, 2*TAR_BLOCK_SIZE);
|
---|
724 | xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE);
|
---|
725 |
|
---|
726 | /* To be pedantically correct, we would check if the tarball
|
---|
727 | * is smaller than 20 tar blocks, and pad it if it was smaller,
|
---|
728 | * but that isn't necessary for GNU tar interoperability, and
|
---|
729 | * so is considered a waste of space */
|
---|
730 |
|
---|
731 | /* Close so the child process (if any) will exit */
|
---|
732 | close(tbInfo.tarFd);
|
---|
733 |
|
---|
734 | /* Hang up the tools, close up shop, head home */
|
---|
735 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
736 | freeHardLinkInfo(&tbInfo.hlInfoHead);
|
---|
737 |
|
---|
738 | if (errorFlag)
|
---|
739 | bb_error_msg("error exit delayed from previous errors");
|
---|
740 |
|
---|
741 | #if SEAMLESS_COMPRESSION
|
---|
742 | if (gzip) {
|
---|
743 | int status;
|
---|
744 | if (safe_waitpid(-1, &status, 0) == -1)
|
---|
745 | bb_perror_msg("waitpid");
|
---|
746 | else if (!WIFEXITED(status) || WEXITSTATUS(status))
|
---|
747 | /* gzip was killed or has exited with nonzero! */
|
---|
748 | errorFlag = TRUE;
|
---|
749 | }
|
---|
750 | #endif
|
---|
751 | return errorFlag;
|
---|
752 | }
|
---|
753 | #else /* !FEATURE_TAR_CREATE */
|
---|
754 | # define writeTarFile(...) 0
|
---|
755 | #endif
|
---|
756 |
|
---|
757 | #if ENABLE_FEATURE_TAR_FROM
|
---|
758 | static llist_t *append_file_list_to_list(llist_t *list)
|
---|
759 | {
|
---|
760 | FILE *src_stream;
|
---|
761 | char *line;
|
---|
762 | llist_t *newlist = NULL;
|
---|
763 |
|
---|
764 | while (list) {
|
---|
765 | src_stream = xfopen_stdin(llist_pop(&list));
|
---|
766 | while ((line = xmalloc_fgetline(src_stream)) != NULL) {
|
---|
767 | /* kill trailing '/' unless the string is just "/" */
|
---|
768 | char *cp = last_char_is(line, '/');
|
---|
769 | if (cp > line)
|
---|
770 | *cp = '\0';
|
---|
771 | llist_add_to_end(&newlist, line);
|
---|
772 | }
|
---|
773 | fclose(src_stream);
|
---|
774 | }
|
---|
775 | return newlist;
|
---|
776 | }
|
---|
777 | #endif
|
---|
778 |
|
---|
779 | //usage:#define tar_trivial_usage
|
---|
780 | //usage: "-[" IF_FEATURE_TAR_CREATE("c") "xt"
|
---|
781 | //usage: IF_FEATURE_SEAMLESS_Z("Z")
|
---|
782 | //usage: IF_FEATURE_SEAMLESS_GZ("z")
|
---|
783 | //usage: IF_FEATURE_SEAMLESS_XZ("J")
|
---|
784 | //usage: IF_FEATURE_SEAMLESS_BZ2("j")
|
---|
785 | //usage: IF_FEATURE_SEAMLESS_LZMA("a")
|
---|
786 | //usage: IF_FEATURE_TAR_CREATE("h")
|
---|
787 | //usage: IF_FEATURE_TAR_NOPRESERVE_TIME("m")
|
---|
788 | //usage: "vO] "
|
---|
789 | //usage: IF_FEATURE_TAR_FROM("[-X FILE] [-T FILE] ")
|
---|
790 | //usage: "[-f TARFILE] [-C DIR] [FILE]..."
|
---|
791 | //usage:#define tar_full_usage "\n\n"
|
---|
792 | //usage: IF_FEATURE_TAR_CREATE("Create, extract, ")
|
---|
793 | //usage: IF_NOT_FEATURE_TAR_CREATE("Extract ")
|
---|
794 | //usage: "or list files from a tar file\n"
|
---|
795 | //usage: "\nOperation:"
|
---|
796 | //usage: IF_FEATURE_TAR_CREATE(
|
---|
797 | //usage: "\n c Create"
|
---|
798 | //usage: )
|
---|
799 | //usage: "\n x Extract"
|
---|
800 | //usage: "\n t List"
|
---|
801 | //usage: "\n f Name of TARFILE ('-' for stdin/out)"
|
---|
802 | //usage: "\n C Change to DIR before operation"
|
---|
803 | //usage: "\n v Verbose"
|
---|
804 | //usage: IF_FEATURE_SEAMLESS_Z(
|
---|
805 | //usage: "\n Z (De)compress using compress"
|
---|
806 | //usage: )
|
---|
807 | //usage: IF_FEATURE_SEAMLESS_GZ(
|
---|
808 | //usage: "\n z (De)compress using gzip"
|
---|
809 | //usage: )
|
---|
810 | //usage: IF_FEATURE_SEAMLESS_XZ(
|
---|
811 | //usage: "\n J (De)compress using xz"
|
---|
812 | //usage: )
|
---|
813 | //usage: IF_FEATURE_SEAMLESS_BZ2(
|
---|
814 | //usage: "\n j (De)compress using bzip2"
|
---|
815 | //usage: )
|
---|
816 | //usage: IF_FEATURE_SEAMLESS_LZMA(
|
---|
817 | //usage: "\n a (De)compress using lzma"
|
---|
818 | //usage: )
|
---|
819 | //usage: "\n O Extract to stdout"
|
---|
820 | //usage: IF_FEATURE_TAR_CREATE(
|
---|
821 | //usage: "\n h Follow symlinks"
|
---|
822 | //usage: )
|
---|
823 | //usage: IF_FEATURE_TAR_NOPRESERVE_TIME(
|
---|
824 | //usage: "\n m Don't restore mtime"
|
---|
825 | //usage: )
|
---|
826 | //usage: IF_FEATURE_TAR_FROM(
|
---|
827 | //usage: IF_FEATURE_TAR_LONG_OPTIONS(
|
---|
828 | //usage: "\n exclude File to exclude"
|
---|
829 | //usage: )
|
---|
830 | //usage: "\n X File with names to exclude"
|
---|
831 | //usage: "\n T File with names to include"
|
---|
832 | //usage: )
|
---|
833 | //usage:
|
---|
834 | //usage:#define tar_example_usage
|
---|
835 | //usage: "$ zcat /tmp/tarball.tar.gz | tar -xf -\n"
|
---|
836 | //usage: "$ tar -cf /tmp/tarball.tar /usr/local\n"
|
---|
837 |
|
---|
838 | // Supported but aren't in --help:
|
---|
839 | // o no-same-owner
|
---|
840 | // p same-permissions
|
---|
841 | // k keep-old
|
---|
842 | // no-recursion
|
---|
843 | // numeric-owner
|
---|
844 | // no-same-permissions
|
---|
845 | // overwrite
|
---|
846 | //IF_FEATURE_TAR_TO_COMMAND(
|
---|
847 | // to-command
|
---|
848 | //)
|
---|
849 |
|
---|
850 | enum {
|
---|
851 | OPTBIT_KEEP_OLD = 8,
|
---|
852 | IF_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)
|
---|
853 | IF_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,)
|
---|
854 | IF_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2 ,)
|
---|
855 | IF_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA ,)
|
---|
856 | IF_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,)
|
---|
857 | IF_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,)
|
---|
858 | IF_FEATURE_SEAMLESS_GZ( OPTBIT_GZIP ,)
|
---|
859 | IF_FEATURE_SEAMLESS_XZ( OPTBIT_XZ ,) // 16th bit
|
---|
860 | IF_FEATURE_SEAMLESS_Z( OPTBIT_COMPRESS ,)
|
---|
861 | IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,)
|
---|
862 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS
|
---|
863 | OPTBIT_STRIP_COMPONENTS,
|
---|
864 | OPTBIT_NORECURSION,
|
---|
865 | IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND ,)
|
---|
866 | OPTBIT_NUMERIC_OWNER,
|
---|
867 | OPTBIT_NOPRESERVE_PERM,
|
---|
868 | OPTBIT_OVERWRITE,
|
---|
869 | #endif
|
---|
870 | OPT_TEST = 1 << 0, // t
|
---|
871 | OPT_EXTRACT = 1 << 1, // x
|
---|
872 | OPT_BASEDIR = 1 << 2, // C
|
---|
873 | OPT_TARNAME = 1 << 3, // f
|
---|
874 | OPT_2STDOUT = 1 << 4, // O
|
---|
875 | OPT_NOPRESERVE_OWNER = 1 << 5, // o == no-same-owner
|
---|
876 | OPT_P = 1 << 6, // p
|
---|
877 | OPT_VERBOSE = 1 << 7, // v
|
---|
878 | OPT_KEEP_OLD = 1 << 8, // k
|
---|
879 | OPT_CREATE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_CREATE )) + 0, // c
|
---|
880 | OPT_DEREFERENCE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_DEREFERENCE )) + 0, // h
|
---|
881 | OPT_BZIP2 = IF_FEATURE_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2 )) + 0, // j
|
---|
882 | OPT_LZMA = IF_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA )) + 0, // a
|
---|
883 | OPT_INCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_INCLUDE_FROM)) + 0, // T
|
---|
884 | OPT_EXCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X
|
---|
885 | OPT_GZIP = IF_FEATURE_SEAMLESS_GZ( (1 << OPTBIT_GZIP )) + 0, // z
|
---|
886 | OPT_XZ = IF_FEATURE_SEAMLESS_XZ( (1 << OPTBIT_XZ )) + 0, // J
|
---|
887 | OPT_COMPRESS = IF_FEATURE_SEAMLESS_Z( (1 << OPTBIT_COMPRESS )) + 0, // Z
|
---|
888 | OPT_NOPRESERVE_TIME = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m
|
---|
889 | OPT_STRIP_COMPONENTS = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_STRIP_COMPONENTS)) + 0, // strip-components
|
---|
890 | OPT_NORECURSION = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NORECURSION )) + 0, // no-recursion
|
---|
891 | OPT_2COMMAND = IF_FEATURE_TAR_TO_COMMAND( (1 << OPTBIT_2COMMAND )) + 0, // to-command
|
---|
892 | OPT_NUMERIC_OWNER = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NUMERIC_OWNER )) + 0, // numeric-owner
|
---|
893 | OPT_NOPRESERVE_PERM = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions
|
---|
894 | OPT_OVERWRITE = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE )) + 0, // overwrite
|
---|
895 |
|
---|
896 | OPT_ANY_COMPRESS = (OPT_BZIP2 | OPT_LZMA | OPT_GZIP | OPT_XZ | OPT_COMPRESS),
|
---|
897 | };
|
---|
898 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS
|
---|
899 | static const char tar_longopts[] ALIGN1 =
|
---|
900 | "list\0" No_argument "t"
|
---|
901 | "extract\0" No_argument "x"
|
---|
902 | "directory\0" Required_argument "C"
|
---|
903 | "file\0" Required_argument "f"
|
---|
904 | "to-stdout\0" No_argument "O"
|
---|
905 | /* do not restore owner */
|
---|
906 | /* Note: GNU tar handles 'o' as no-same-owner only on extract,
|
---|
907 | * on create, 'o' is --old-archive. We do not support --old-archive. */
|
---|
908 | "no-same-owner\0" No_argument "o"
|
---|
909 | "same-permissions\0" No_argument "p"
|
---|
910 | "verbose\0" No_argument "v"
|
---|
911 | "keep-old\0" No_argument "k"
|
---|
912 | # if ENABLE_FEATURE_TAR_CREATE
|
---|
913 | "create\0" No_argument "c"
|
---|
914 | "dereference\0" No_argument "h"
|
---|
915 | # endif
|
---|
916 | # if ENABLE_FEATURE_SEAMLESS_BZ2
|
---|
917 | "bzip2\0" No_argument "j"
|
---|
918 | # endif
|
---|
919 | # if ENABLE_FEATURE_SEAMLESS_LZMA
|
---|
920 | "lzma\0" No_argument "a"
|
---|
921 | # endif
|
---|
922 | # if ENABLE_FEATURE_TAR_FROM
|
---|
923 | "files-from\0" Required_argument "T"
|
---|
924 | "exclude-from\0" Required_argument "X"
|
---|
925 | # endif
|
---|
926 | # if ENABLE_FEATURE_SEAMLESS_GZ
|
---|
927 | "gzip\0" No_argument "z"
|
---|
928 | # endif
|
---|
929 | # if ENABLE_FEATURE_SEAMLESS_XZ
|
---|
930 | "xz\0" No_argument "J"
|
---|
931 | # endif
|
---|
932 | # if ENABLE_FEATURE_SEAMLESS_Z
|
---|
933 | "compress\0" No_argument "Z"
|
---|
934 | # endif
|
---|
935 | # if ENABLE_FEATURE_TAR_NOPRESERVE_TIME
|
---|
936 | "touch\0" No_argument "m"
|
---|
937 | # endif
|
---|
938 | "strip-components\0" Required_argument "\xf9"
|
---|
939 | "no-recursion\0" No_argument "\xfa"
|
---|
940 | # if ENABLE_FEATURE_TAR_TO_COMMAND
|
---|
941 | "to-command\0" Required_argument "\xfb"
|
---|
942 | # endif
|
---|
943 | /* use numeric uid/gid from tar header, not textual */
|
---|
944 | "numeric-owner\0" No_argument "\xfc"
|
---|
945 | /* do not restore mode */
|
---|
946 | "no-same-permissions\0" No_argument "\xfd"
|
---|
947 | /* on unpack, open with O_TRUNC and !O_EXCL */
|
---|
948 | "overwrite\0" No_argument "\xfe"
|
---|
949 | /* --exclude takes next bit position in option mask, */
|
---|
950 | /* therefore we have to put it _after_ --no-same-permissions */
|
---|
951 | # if ENABLE_FEATURE_TAR_FROM
|
---|
952 | "exclude\0" Required_argument "\xff"
|
---|
953 | # endif
|
---|
954 | ;
|
---|
955 | #endif
|
---|
956 |
|
---|
957 | int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
958 | int tar_main(int argc UNUSED_PARAM, char **argv)
|
---|
959 | {
|
---|
960 | archive_handle_t *tar_handle;
|
---|
961 | char *base_dir = NULL;
|
---|
962 | const char *tar_filename = "-";
|
---|
963 | unsigned opt;
|
---|
964 | int verboseFlag = 0;
|
---|
965 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
|
---|
966 | llist_t *excludes = NULL;
|
---|
967 | #endif
|
---|
968 | INIT_G();
|
---|
969 |
|
---|
970 | /* Initialise default values */
|
---|
971 | tar_handle = init_handle();
|
---|
972 | tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS
|
---|
973 | | ARCHIVE_RESTORE_DATE
|
---|
974 | | ARCHIVE_UNLINK_OLD;
|
---|
975 |
|
---|
976 | /* Apparently only root's tar preserves perms (see bug 3844) */
|
---|
977 | if (getuid() != 0)
|
---|
978 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
|
---|
979 |
|
---|
980 | /* Prepend '-' to the first argument if required */
|
---|
981 | opt_complementary = "--:" // first arg is options
|
---|
982 | "tt:vv:" // count -t,-v
|
---|
983 | IF_FEATURE_TAR_FROM("X::T::") // cumulative lists
|
---|
984 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
|
---|
985 | "\xff::" // --exclude=PATTERN is a list
|
---|
986 | #endif
|
---|
987 | IF_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
|
---|
988 | IF_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
|
---|
989 | IF_NOT_FEATURE_TAR_CREATE("t--x:x--t") // mutually exclusive
|
---|
990 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS
|
---|
991 | ":\xf9+" // --strip-components=NUM
|
---|
992 | #endif
|
---|
993 | ;
|
---|
994 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS
|
---|
995 | applet_long_options = tar_longopts;
|
---|
996 | #endif
|
---|
997 | #if ENABLE_DESKTOP
|
---|
998 | /* Lie to buildroot when it starts asking stupid questions. */
|
---|
999 | if (argv[1] && strcmp(argv[1], "--version") == 0) {
|
---|
1000 | // Output of 'tar --version' examples:
|
---|
1001 | // tar (GNU tar) 1.15.1
|
---|
1002 | // tar (GNU tar) 1.25
|
---|
1003 | // bsdtar 2.8.3 - libarchive 2.8.3
|
---|
1004 | puts("tar (busybox) " BB_VER);
|
---|
1005 | return 0;
|
---|
1006 | }
|
---|
1007 | if (argv[1] && argv[1][0] != '-') {
|
---|
1008 | /* Compat:
|
---|
1009 | * 1st argument without dash handles options with parameters
|
---|
1010 | * differently from dashed one: it takes *next argv[i]*
|
---|
1011 | * as paramenter even if there are more chars in 1st argument:
|
---|
1012 | * "tar fx TARFILE" - "x" is not taken as f's param
|
---|
1013 | * but is interpreted as -x option
|
---|
1014 | * "tar -xf TARFILE" - dashed equivalent of the above
|
---|
1015 | * "tar -fx ..." - "x" is taken as f's param
|
---|
1016 | * getopt32 wouldn't handle 1st command correctly.
|
---|
1017 | * Unfortunately, people do use such commands.
|
---|
1018 | * We massage argv[1] to work around it by moving 'f'
|
---|
1019 | * to the end of the string.
|
---|
1020 | * More contrived "tar fCx TARFILE DIR" still fails,
|
---|
1021 | * but such commands are much less likely to be used.
|
---|
1022 | */
|
---|
1023 | char *f = strchr(argv[1], 'f');
|
---|
1024 | if (f) {
|
---|
1025 | while (f[1] != '\0') {
|
---|
1026 | *f = f[1];
|
---|
1027 | f++;
|
---|
1028 | }
|
---|
1029 | *f = 'f';
|
---|
1030 | }
|
---|
1031 | }
|
---|
1032 | #endif
|
---|
1033 | opt = getopt32(argv,
|
---|
1034 | "txC:f:Oopvk"
|
---|
1035 | IF_FEATURE_TAR_CREATE( "ch" )
|
---|
1036 | IF_FEATURE_SEAMLESS_BZ2( "j" )
|
---|
1037 | IF_FEATURE_SEAMLESS_LZMA("a" )
|
---|
1038 | IF_FEATURE_TAR_FROM( "T:X:")
|
---|
1039 | IF_FEATURE_SEAMLESS_GZ( "z" )
|
---|
1040 | IF_FEATURE_SEAMLESS_XZ( "J" )
|
---|
1041 | IF_FEATURE_SEAMLESS_Z( "Z" )
|
---|
1042 | IF_FEATURE_TAR_NOPRESERVE_TIME("m")
|
---|
1043 | IF_FEATURE_TAR_LONG_OPTIONS("\xf9:") // --strip-components
|
---|
1044 | , &base_dir // -C dir
|
---|
1045 | , &tar_filename // -f filename
|
---|
1046 | IF_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
|
---|
1047 | IF_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X
|
---|
1048 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS
|
---|
1049 | , &tar_handle->tar__strip_components // --strip-components
|
---|
1050 | #endif
|
---|
1051 | IF_FEATURE_TAR_TO_COMMAND(, &(tar_handle->tar__to_command)) // --to-command
|
---|
1052 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
|
---|
1053 | , &excludes // --exclude
|
---|
1054 | #endif
|
---|
1055 | , &verboseFlag // combined count for -t and -v
|
---|
1056 | , &verboseFlag // combined count for -t and -v
|
---|
1057 | );
|
---|
1058 | #if DBG_OPTION_PARSING
|
---|
1059 | bb_error_msg("opt: 0x%08x", opt);
|
---|
1060 | # define showopt(o) bb_error_msg("opt & %s(%x): %x", #o, o, opt & o);
|
---|
1061 | showopt(OPT_TEST );
|
---|
1062 | showopt(OPT_EXTRACT );
|
---|
1063 | showopt(OPT_BASEDIR );
|
---|
1064 | showopt(OPT_TARNAME );
|
---|
1065 | showopt(OPT_2STDOUT );
|
---|
1066 | showopt(OPT_NOPRESERVE_OWNER);
|
---|
1067 | showopt(OPT_P );
|
---|
1068 | showopt(OPT_VERBOSE );
|
---|
1069 | showopt(OPT_KEEP_OLD );
|
---|
1070 | showopt(OPT_CREATE );
|
---|
1071 | showopt(OPT_DEREFERENCE );
|
---|
1072 | showopt(OPT_BZIP2 );
|
---|
1073 | showopt(OPT_LZMA );
|
---|
1074 | showopt(OPT_INCLUDE_FROM );
|
---|
1075 | showopt(OPT_EXCLUDE_FROM );
|
---|
1076 | showopt(OPT_GZIP );
|
---|
1077 | showopt(OPT_XZ );
|
---|
1078 | showopt(OPT_COMPRESS );
|
---|
1079 | showopt(OPT_NOPRESERVE_TIME );
|
---|
1080 | showopt(OPT_STRIP_COMPONENTS);
|
---|
1081 | showopt(OPT_NORECURSION );
|
---|
1082 | showopt(OPT_2COMMAND );
|
---|
1083 | showopt(OPT_NUMERIC_OWNER );
|
---|
1084 | showopt(OPT_NOPRESERVE_PERM );
|
---|
1085 | showopt(OPT_OVERWRITE );
|
---|
1086 | showopt(OPT_ANY_COMPRESS );
|
---|
1087 | bb_error_msg("base_dir:'%s'", base_dir);
|
---|
1088 | bb_error_msg("tar_filename:'%s'", tar_filename);
|
---|
1089 | bb_error_msg("verboseFlag:%d", verboseFlag);
|
---|
1090 | bb_error_msg("tar_handle->tar__to_command:'%s'", tar_handle->tar__to_command);
|
---|
1091 | bb_error_msg("tar_handle->tar__strip_components:%u", tar_handle->tar__strip_components);
|
---|
1092 | return 0;
|
---|
1093 | # undef showopt
|
---|
1094 | #endif
|
---|
1095 | argv += optind;
|
---|
1096 |
|
---|
1097 | if (verboseFlag)
|
---|
1098 | tar_handle->action_header = header_verbose_list;
|
---|
1099 | if (verboseFlag == 1)
|
---|
1100 | tar_handle->action_header = header_list;
|
---|
1101 |
|
---|
1102 | if (opt & OPT_EXTRACT)
|
---|
1103 | tar_handle->action_data = data_extract_all;
|
---|
1104 |
|
---|
1105 | if (opt & OPT_2STDOUT)
|
---|
1106 | tar_handle->action_data = data_extract_to_stdout;
|
---|
1107 |
|
---|
1108 | if (opt & OPT_2COMMAND) {
|
---|
1109 | putenv((char*)"TAR_FILETYPE=f");
|
---|
1110 | signal(SIGPIPE, SIG_IGN);
|
---|
1111 | tar_handle->action_data = data_extract_to_command;
|
---|
1112 | IF_FEATURE_TAR_TO_COMMAND(tar_handle->tar__to_command_shell = xstrdup(get_shell_name());)
|
---|
1113 | }
|
---|
1114 |
|
---|
1115 | if (opt & OPT_KEEP_OLD)
|
---|
1116 | tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
|
---|
1117 |
|
---|
1118 | if (opt & OPT_NUMERIC_OWNER)
|
---|
1119 | tar_handle->ah_flags |= ARCHIVE_NUMERIC_OWNER;
|
---|
1120 |
|
---|
1121 | if (opt & OPT_NOPRESERVE_OWNER)
|
---|
1122 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_OWNER;
|
---|
1123 |
|
---|
1124 | if (opt & OPT_NOPRESERVE_PERM)
|
---|
1125 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
|
---|
1126 |
|
---|
1127 | if (opt & OPT_OVERWRITE) {
|
---|
1128 | tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
|
---|
1129 | tar_handle->ah_flags |= ARCHIVE_O_TRUNC;
|
---|
1130 | }
|
---|
1131 |
|
---|
1132 | if (opt & OPT_NOPRESERVE_TIME)
|
---|
1133 | tar_handle->ah_flags &= ~ARCHIVE_RESTORE_DATE;
|
---|
1134 |
|
---|
1135 | #if ENABLE_FEATURE_TAR_FROM
|
---|
1136 | tar_handle->reject = append_file_list_to_list(tar_handle->reject);
|
---|
1137 | # if ENABLE_FEATURE_TAR_LONG_OPTIONS
|
---|
1138 | /* Append excludes to reject */
|
---|
1139 | while (excludes) {
|
---|
1140 | llist_t *next = excludes->link;
|
---|
1141 | excludes->link = tar_handle->reject;
|
---|
1142 | tar_handle->reject = excludes;
|
---|
1143 | excludes = next;
|
---|
1144 | }
|
---|
1145 | # endif
|
---|
1146 | tar_handle->accept = append_file_list_to_list(tar_handle->accept);
|
---|
1147 | #endif
|
---|
1148 |
|
---|
1149 | /* Setup an array of filenames to work with */
|
---|
1150 | /* TODO: This is the same as in ar, make a separate function? */
|
---|
1151 | while (*argv) {
|
---|
1152 | /* kill trailing '/' unless the string is just "/" */
|
---|
1153 | char *cp = last_char_is(*argv, '/');
|
---|
1154 | if (cp > *argv)
|
---|
1155 | *cp = '\0';
|
---|
1156 | llist_add_to_end(&tar_handle->accept, *argv);
|
---|
1157 | argv++;
|
---|
1158 | }
|
---|
1159 |
|
---|
1160 | if (tar_handle->accept || tar_handle->reject)
|
---|
1161 | tar_handle->filter = filter_accept_reject_list;
|
---|
1162 |
|
---|
1163 | /* Open the tar file */
|
---|
1164 | {
|
---|
1165 | int tar_fd = STDIN_FILENO;
|
---|
1166 | int flags = O_RDONLY;
|
---|
1167 |
|
---|
1168 | if (opt & OPT_CREATE) {
|
---|
1169 | /* Make sure there is at least one file to tar up */
|
---|
1170 | if (tar_handle->accept == NULL)
|
---|
1171 | bb_error_msg_and_die("empty archive");
|
---|
1172 |
|
---|
1173 | tar_fd = STDOUT_FILENO;
|
---|
1174 | /* Mimicking GNU tar 1.15.1: */
|
---|
1175 | flags = O_WRONLY | O_CREAT | O_TRUNC;
|
---|
1176 | }
|
---|
1177 |
|
---|
1178 | if (LONE_DASH(tar_filename)) {
|
---|
1179 | tar_handle->src_fd = tar_fd;
|
---|
1180 | tar_handle->seek = seek_by_read;
|
---|
1181 | } else {
|
---|
1182 | if (ENABLE_FEATURE_TAR_AUTODETECT
|
---|
1183 | && flags == O_RDONLY
|
---|
1184 | && !(opt & OPT_ANY_COMPRESS)
|
---|
1185 | ) {
|
---|
1186 | tar_handle->src_fd = open_zipped(tar_filename, /*fail_if_not_compressed:*/ 0);
|
---|
1187 | if (tar_handle->src_fd < 0)
|
---|
1188 | bb_perror_msg_and_die("can't open '%s'", tar_filename);
|
---|
1189 | } else {
|
---|
1190 | tar_handle->src_fd = xopen(tar_filename, flags);
|
---|
1191 | }
|
---|
1192 | }
|
---|
1193 | }
|
---|
1194 |
|
---|
1195 | if (base_dir)
|
---|
1196 | xchdir(base_dir);
|
---|
1197 |
|
---|
1198 | //if (SEAMLESS_COMPRESSION)
|
---|
1199 | // /* We need to know whether child (gzip/bzip/etc) exits abnormally */
|
---|
1200 | // signal(SIGCHLD, check_errors_in_children);
|
---|
1201 |
|
---|
1202 | #if ENABLE_FEATURE_TAR_CREATE
|
---|
1203 | /* Create an archive */
|
---|
1204 | if (opt & OPT_CREATE) {
|
---|
1205 | # if SEAMLESS_COMPRESSION
|
---|
1206 | const char *zipMode = NULL;
|
---|
1207 | if (opt & OPT_COMPRESS)
|
---|
1208 | zipMode = "compress";
|
---|
1209 | if (opt & OPT_GZIP)
|
---|
1210 | zipMode = "gzip";
|
---|
1211 | if (opt & OPT_BZIP2)
|
---|
1212 | zipMode = "bzip2";
|
---|
1213 | if (opt & OPT_LZMA)
|
---|
1214 | zipMode = "lzma";
|
---|
1215 | if (opt & OPT_XZ)
|
---|
1216 | zipMode = "xz";
|
---|
1217 | # endif
|
---|
1218 | /* NB: writeTarFile() closes tar_handle->src_fd */
|
---|
1219 | return writeTarFile(tar_handle->src_fd, verboseFlag,
|
---|
1220 | (opt & OPT_DEREFERENCE ? ACTION_FOLLOWLINKS : 0)
|
---|
1221 | | (opt & OPT_NORECURSION ? 0 : ACTION_RECURSE),
|
---|
1222 | tar_handle->accept,
|
---|
1223 | tar_handle->reject, zipMode);
|
---|
1224 | }
|
---|
1225 | #endif
|
---|
1226 |
|
---|
1227 | if (opt & OPT_ANY_COMPRESS) {
|
---|
1228 | USE_FOR_MMU(IF_DESKTOP(long long) int FAST_FUNC (*xformer)(transformer_state_t *xstate);)
|
---|
1229 | USE_FOR_NOMMU(const char *xformer_prog;)
|
---|
1230 |
|
---|
1231 | if (opt & OPT_COMPRESS)
|
---|
1232 | USE_FOR_MMU(xformer = unpack_Z_stream;)
|
---|
1233 | USE_FOR_NOMMU(xformer_prog = "uncompress";)
|
---|
1234 | if (opt & OPT_GZIP)
|
---|
1235 | USE_FOR_MMU(xformer = unpack_gz_stream;)
|
---|
1236 | USE_FOR_NOMMU(xformer_prog = "gunzip";)
|
---|
1237 | if (opt & OPT_BZIP2)
|
---|
1238 | USE_FOR_MMU(xformer = unpack_bz2_stream;)
|
---|
1239 | USE_FOR_NOMMU(xformer_prog = "bunzip2";)
|
---|
1240 | if (opt & OPT_LZMA)
|
---|
1241 | USE_FOR_MMU(xformer = unpack_lzma_stream;)
|
---|
1242 | USE_FOR_NOMMU(xformer_prog = "unlzma";)
|
---|
1243 | if (opt & OPT_XZ)
|
---|
1244 | USE_FOR_MMU(xformer = unpack_xz_stream;)
|
---|
1245 | USE_FOR_NOMMU(xformer_prog = "unxz";)
|
---|
1246 |
|
---|
1247 | fork_transformer_with_sig(tar_handle->src_fd, xformer, xformer_prog);
|
---|
1248 | /* Can't lseek over pipes */
|
---|
1249 | tar_handle->seek = seek_by_read;
|
---|
1250 | /*tar_handle->offset = 0; - already is */
|
---|
1251 | }
|
---|
1252 |
|
---|
1253 | /* Zero processed headers (== empty file) is not a valid tarball.
|
---|
1254 | * We (ab)use bb_got_signal as exitcode here,
|
---|
1255 | * because check_errors_in_children() uses _it_ as error indicator.
|
---|
1256 | */
|
---|
1257 | bb_got_signal = EXIT_FAILURE;
|
---|
1258 |
|
---|
1259 | while (get_header_tar(tar_handle) == EXIT_SUCCESS)
|
---|
1260 | bb_got_signal = EXIT_SUCCESS; /* saw at least one header, good */
|
---|
1261 |
|
---|
1262 | /* Check that every file that should have been extracted was */
|
---|
1263 | while (tar_handle->accept) {
|
---|
1264 | if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
|
---|
1265 | && !find_list_entry(tar_handle->passed, tar_handle->accept->data)
|
---|
1266 | ) {
|
---|
1267 | bb_error_msg_and_die("%s: not found in archive",
|
---|
1268 | tar_handle->accept->data);
|
---|
1269 | }
|
---|
1270 | tar_handle->accept = tar_handle->accept->link;
|
---|
1271 | }
|
---|
1272 | if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */)
|
---|
1273 | close(tar_handle->src_fd);
|
---|
1274 |
|
---|
1275 | if (SEAMLESS_COMPRESSION || OPT_COMPRESS) {
|
---|
1276 | /* Set bb_got_signal to 1 if a child died with !0 exitcode */
|
---|
1277 | check_errors_in_children(0);
|
---|
1278 | }
|
---|
1279 |
|
---|
1280 | return bb_got_signal;
|
---|
1281 | }
|
---|