| 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 |
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| 26 | #include <fnmatch.h>
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| 27 | #include "libbb.h"
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| 28 | #include "archive.h"
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| 29 | /* FIXME: Stop using this non-standard feature */
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| 30 | #ifndef FNM_LEADING_DIR
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| 31 | # define FNM_LEADING_DIR 0
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| 32 | #endif
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| 33 |
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| 34 |
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| 35 | //#define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__)
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| 36 | #define DBG(...) ((void)0)
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| 37 |
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| 38 |
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| 39 | #define block_buf bb_common_bufsiz1
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| 40 |
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| 41 |
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| 42 | #if !ENABLE_FEATURE_SEAMLESS_GZ && !ENABLE_FEATURE_SEAMLESS_BZ2
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| 43 | /* Do not pass gzip flag to writeTarFile() */
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| 44 | #define writeTarFile(tar_fd, verboseFlag, dereferenceFlag, include, exclude, gzip) \
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| 45 | writeTarFile(tar_fd, verboseFlag, dereferenceFlag, include, exclude)
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| 46 | #endif
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| 47 |
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| 48 |
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| 49 | #if ENABLE_FEATURE_TAR_CREATE
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| 50 |
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| 51 | /*
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| 52 | ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
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| 53 | ** the only functions that deal with the HardLinkInfo structure.
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| 54 | ** Even these functions use the xxxHardLinkInfo() functions.
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| 55 | */
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| 56 | typedef struct HardLinkInfo {
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| 57 | struct HardLinkInfo *next; /* Next entry in list */
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| 58 | dev_t dev; /* Device number */
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| 59 | ino_t ino; /* Inode number */
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| 60 | // short linkCount; /* (Hard) Link Count */
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| 61 | char name[1]; /* Start of filename (must be last) */
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| 62 | } HardLinkInfo;
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| 63 |
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| 64 | /* Some info to be carried along when creating a new tarball */
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| 65 | typedef struct TarBallInfo {
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| 66 | int tarFd; /* Open-for-write file descriptor
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| 67 | * for the tarball */
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| 68 | int verboseFlag; /* Whether to print extra stuff or not */
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| 69 | const llist_t *excludeList; /* List of files to not include */
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| 70 | HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
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| 71 | HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
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| 72 | //TODO: save only st_dev + st_ino
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| 73 | struct stat tarFileStatBuf; /* Stat info for the tarball, letting
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| 74 | * us know the inode and device that the
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| 75 | * tarball lives, so we can avoid trying
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| 76 | * to include the tarball into itself */
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| 77 | } TarBallInfo;
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| 78 |
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| 79 | /* A nice enum with all the possible tar file content types */
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| 80 | enum {
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| 81 | REGTYPE = '0', /* regular file */
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| 82 | REGTYPE0 = '\0', /* regular file (ancient bug compat) */
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| 83 | LNKTYPE = '1', /* hard link */
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| 84 | SYMTYPE = '2', /* symbolic link */
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| 85 | CHRTYPE = '3', /* character special */
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| 86 | BLKTYPE = '4', /* block special */
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| 87 | DIRTYPE = '5', /* directory */
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| 88 | FIFOTYPE = '6', /* FIFO special */
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| 89 | CONTTYPE = '7', /* reserved */
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| 90 | GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
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| 91 | GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
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| 92 | };
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| 93 |
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| 94 | /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
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| 95 | static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr,
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| 96 | struct stat *statbuf,
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| 97 | const char *fileName)
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| 98 | {
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| 99 | /* Note: hlInfoHeadPtr can never be NULL! */
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| 100 | HardLinkInfo *hlInfo;
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| 101 |
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| 102 | hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName));
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| 103 | hlInfo->next = *hlInfoHeadPtr;
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| 104 | *hlInfoHeadPtr = hlInfo;
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| 105 | hlInfo->dev = statbuf->st_dev;
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| 106 | hlInfo->ino = statbuf->st_ino;
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| 107 | // hlInfo->linkCount = statbuf->st_nlink;
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| 108 | strcpy(hlInfo->name, fileName);
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| 109 | }
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| 110 |
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| 111 | static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr)
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| 112 | {
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| 113 | HardLinkInfo *hlInfo;
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| 114 | HardLinkInfo *hlInfoNext;
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| 115 |
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| 116 | if (hlInfoHeadPtr) {
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| 117 | hlInfo = *hlInfoHeadPtr;
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| 118 | while (hlInfo) {
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| 119 | hlInfoNext = hlInfo->next;
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| 120 | free(hlInfo);
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| 121 | hlInfo = hlInfoNext;
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| 122 | }
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| 123 | *hlInfoHeadPtr = NULL;
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| 124 | }
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| 125 | }
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| 126 |
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| 127 | /* Might be faster (and bigger) if the dev/ino were stored in numeric order ;) */
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| 128 | static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf)
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| 129 | {
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| 130 | while (hlInfo) {
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| 131 | if (statbuf->st_ino == hlInfo->ino
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| 132 | && statbuf->st_dev == hlInfo->dev
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| 133 | ) {
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| 134 | DBG("found hardlink:'%s'", hlInfo->name);
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| 135 | break;
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| 136 | }
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| 137 | hlInfo = hlInfo->next;
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| 138 | }
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| 139 | return hlInfo;
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| 140 | }
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| 141 |
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| 142 | /* Put an octal string into the specified buffer.
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| 143 | * The number is zero padded and possibly null terminated.
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| 144 | * Stores low-order bits only if whole value does not fit. */
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| 145 | static void putOctal(char *cp, int len, off_t value)
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| 146 | {
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| 147 | char tempBuffer[sizeof(off_t)*3 + 1];
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| 148 | char *tempString = tempBuffer;
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| 149 | int width;
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| 150 |
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| 151 | width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value);
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| 152 | tempString += (width - len);
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| 153 |
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| 154 | /* If string has leading zeroes, we can drop one */
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| 155 | /* and field will have trailing '\0' */
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| 156 | /* (increases chances of compat with other tars) */
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| 157 | if (tempString[0] == '0')
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| 158 | tempString++;
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| 159 |
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| 160 | /* Copy the string to the field */
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| 161 | memcpy(cp, tempString, len);
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| 162 | }
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| 163 | #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
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| 164 |
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| 165 | static void chksum_and_xwrite(int fd, struct tar_header_t* hp)
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| 166 | {
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| 167 | /* POSIX says that checksum is done on unsigned bytes
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| 168 | * (Sun and HP-UX gets it wrong... more details in
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| 169 | * GNU tar source) */
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| 170 | const unsigned char *cp;
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| 171 | int chksum, size;
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| 172 |
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| 173 | strcpy(hp->magic, "ustar ");
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| 174 |
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| 175 | /* Calculate and store the checksum (i.e., the sum of all of the bytes of
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| 176 | * the header). The checksum field must be filled with blanks for the
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| 177 | * calculation. The checksum field is formatted differently from the
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| 178 | * other fields: it has 6 digits, a null, then a space -- rather than
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| 179 | * digits, followed by a null like the other fields... */
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| 180 | memset(hp->chksum, ' ', sizeof(hp->chksum));
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| 181 | cp = (const unsigned char *) hp;
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| 182 | chksum = 0;
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| 183 | size = sizeof(*hp);
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| 184 | do { chksum += *cp++; } while (--size);
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| 185 | putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum);
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| 186 |
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| 187 | /* Now write the header out to disk */
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| 188 | xwrite(fd, hp, sizeof(*hp));
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| 189 | }
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| 190 |
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| 191 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
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| 192 | static void writeLongname(int fd, int type, const char *name, int dir)
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| 193 | {
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| 194 | static const struct {
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| 195 | char mode[8]; /* 100-107 */
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| 196 | char uid[8]; /* 108-115 */
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| 197 | char gid[8]; /* 116-123 */
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| 198 | char size[12]; /* 124-135 */
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| 199 | char mtime[12]; /* 136-147 */
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| 200 | } prefilled = {
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| 201 | "0000000",
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| 202 | "0000000",
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| 203 | "0000000",
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| 204 | "00000000000",
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| 205 | "00000000000",
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| 206 | };
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| 207 | struct tar_header_t header;
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| 208 | int size;
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| 209 |
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| 210 | dir = !!dir; /* normalize: 0/1 */
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| 211 | size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
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| 212 | /* + dir: account for possible '/' */
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| 213 |
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| 214 | memset(&header, 0, sizeof(header));
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| 215 | strcpy(header.name, "././@LongLink");
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| 216 | memcpy(header.mode, prefilled.mode, sizeof(prefilled));
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| 217 | PUT_OCTAL(header.size, size);
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| 218 | header.typeflag = type;
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| 219 | chksum_and_xwrite(fd, &header);
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| 220 |
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| 221 | /* Write filename[/] and pad the block. */
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| 222 | /* dir=0: writes 'name<NUL>', pads */
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| 223 | /* dir=1: writes 'name', writes '/<NUL>', pads */
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| 224 | dir *= 2;
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| 225 | xwrite(fd, name, size - dir);
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| 226 | xwrite(fd, "/", dir);
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| 227 | size = (-size) & (TAR_BLOCK_SIZE-1);
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| 228 | memset(&header, 0, size);
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| 229 | xwrite(fd, &header, size);
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| 230 | }
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| 231 | #endif
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| 232 |
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| 233 | /* Write out a tar header for the specified file/directory/whatever */
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| 234 | static int writeTarHeader(struct TarBallInfo *tbInfo,
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| 235 | const char *header_name, const char *fileName, struct stat *statbuf)
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| 236 | {
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| 237 | struct tar_header_t header;
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| 238 |
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| 239 | memset(&header, 0, sizeof(header));
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| 240 |
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| 241 | strncpy(header.name, header_name, sizeof(header.name));
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| 242 |
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| 243 | /* POSIX says to mask mode with 07777. */
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| 244 | PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
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| 245 | PUT_OCTAL(header.uid, statbuf->st_uid);
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| 246 | PUT_OCTAL(header.gid, statbuf->st_gid);
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| 247 | memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
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| 248 | PUT_OCTAL(header.mtime, statbuf->st_mtime);
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| 249 |
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| 250 | /* Enter the user and group names */
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| 251 | safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
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| 252 | safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
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| 253 |
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| 254 | if (tbInfo->hlInfo) {
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| 255 | /* This is a hard link */
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| 256 | header.typeflag = LNKTYPE;
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| 257 | strncpy(header.linkname, tbInfo->hlInfo->name,
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| 258 | sizeof(header.linkname));
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| 259 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
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| 260 | /* Write out long linkname if needed */
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| 261 | if (header.linkname[sizeof(header.linkname)-1])
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| 262 | writeLongname(tbInfo->tarFd, GNULONGLINK,
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| 263 | tbInfo->hlInfo->name, 0);
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| 264 | #endif
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| 265 | } else if (S_ISLNK(statbuf->st_mode)) {
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| 266 | char *lpath = xmalloc_readlink_or_warn(fileName);
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| 267 | if (!lpath)
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| 268 | return FALSE;
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| 269 | header.typeflag = SYMTYPE;
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| 270 | strncpy(header.linkname, lpath, sizeof(header.linkname));
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| 271 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
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| 272 | /* Write out long linkname if needed */
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| 273 | if (header.linkname[sizeof(header.linkname)-1])
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| 274 | writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
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| 275 | #else
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| 276 | /* If it is larger than 100 bytes, bail out */
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| 277 | if (header.linkname[sizeof(header.linkname)-1]) {
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| 278 | free(lpath);
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| 279 | bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
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| 280 | return FALSE;
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| 281 | }
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| 282 | #endif
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| 283 | free(lpath);
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| 284 | } else if (S_ISDIR(statbuf->st_mode)) {
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| 285 | header.typeflag = DIRTYPE;
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| 286 | /* Append '/' only if there is a space for it */
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| 287 | if (!header.name[sizeof(header.name)-1])
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| 288 | header.name[strlen(header.name)] = '/';
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| 289 | } else if (S_ISCHR(statbuf->st_mode)) {
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| 290 | header.typeflag = CHRTYPE;
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| 291 | PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
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| 292 | PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
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| 293 | } else if (S_ISBLK(statbuf->st_mode)) {
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| 294 | header.typeflag = BLKTYPE;
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| 295 | PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
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| 296 | PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
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| 297 | } else if (S_ISFIFO(statbuf->st_mode)) {
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| 298 | header.typeflag = FIFOTYPE;
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| 299 | } else if (S_ISREG(statbuf->st_mode)) {
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| 300 | if (sizeof(statbuf->st_size) > 4
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| 301 | && statbuf->st_size > (off_t)0777777777777LL
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| 302 | ) {
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| 303 | bb_error_msg_and_die("can't store file '%s' "
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| 304 | "of size %"OFF_FMT"u, aborting",
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| 305 | fileName, statbuf->st_size);
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| 306 | }
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| 307 | header.typeflag = REGTYPE;
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| 308 | PUT_OCTAL(header.size, statbuf->st_size);
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| 309 | } else {
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| 310 | bb_error_msg("%s: unknown file type", fileName);
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| 311 | return FALSE;
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| 312 | }
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| 313 |
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| 314 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
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| 315 | /* Write out long name if needed */
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| 316 | /* (we, like GNU tar, output long linkname *before* long name) */
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| 317 | if (header.name[sizeof(header.name)-1])
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| 318 | writeLongname(tbInfo->tarFd, GNULONGNAME,
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| 319 | header_name, S_ISDIR(statbuf->st_mode));
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| 320 | #endif
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| 321 |
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| 322 | /* Now write the header out to disk */
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| 323 | chksum_and_xwrite(tbInfo->tarFd, &header);
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| 324 |
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| 325 | /* Now do the verbose thing (or not) */
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| 326 | if (tbInfo->verboseFlag) {
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| 327 | FILE *vbFd = stdout;
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| 328 |
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| 329 | /* If archive goes to stdout, verbose goes to stderr */
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| 330 | if (tbInfo->tarFd == STDOUT_FILENO)
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| 331 | vbFd = stderr;
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| 332 | /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */
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| 333 | /* We don't have such excesses here: for us "v" == "vv" */
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| 334 | /* '/' is probably a GNUism */
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| 335 | fprintf(vbFd, "%s%s\n", header_name,
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| 336 | S_ISDIR(statbuf->st_mode) ? "/" : "");
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| 337 | }
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| 338 |
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| 339 | return TRUE;
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| 340 | }
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| 341 |
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| 342 | #if ENABLE_FEATURE_TAR_FROM
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| 343 | static int exclude_file(const llist_t *excluded_files, const char *file)
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| 344 | {
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| 345 | while (excluded_files) {
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| 346 | if (excluded_files->data[0] == '/') {
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| 347 | if (fnmatch(excluded_files->data, file,
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| 348 | FNM_PATHNAME | FNM_LEADING_DIR) == 0)
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| 349 | return 1;
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| 350 | } else {
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| 351 | const char *p;
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| 352 |
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| 353 | for (p = file; p[0] != '\0'; p++) {
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| 354 | if ((p == file || p[-1] == '/')
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| 355 | && p[0] != '/'
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| 356 | && fnmatch(excluded_files->data, p,
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| 357 | FNM_PATHNAME | FNM_LEADING_DIR) == 0
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| 358 | ) {
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| 359 | return 1;
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| 360 | }
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| 361 | }
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| 362 | }
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| 363 | excluded_files = excluded_files->link;
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| 364 | }
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| 365 |
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| 366 | return 0;
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| 367 | }
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| 368 | #else
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| 369 | # define exclude_file(excluded_files, file) 0
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| 370 | #endif
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| 371 |
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| 372 | static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statbuf,
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| 373 | void *userData, int depth UNUSED_PARAM)
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| 374 | {
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| 375 | struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
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| 376 | const char *header_name;
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| 377 | int inputFileFd = -1;
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| 378 |
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| 379 | DBG("writeFileToTarball('%s')", fileName);
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| 380 |
|
|---|
| 381 | /* Strip leading '/' (must be before memorizing hardlink's name) */
|
|---|
| 382 | header_name = fileName;
|
|---|
| 383 | while (header_name[0] == '/') {
|
|---|
| 384 | static smallint warned;
|
|---|
| 385 |
|
|---|
| 386 | if (!warned) {
|
|---|
| 387 | bb_error_msg("removing leading '/' from member names");
|
|---|
| 388 | warned = 1;
|
|---|
| 389 | }
|
|---|
| 390 | header_name++;
|
|---|
| 391 | }
|
|---|
| 392 |
|
|---|
| 393 | if (header_name[0] == '\0')
|
|---|
| 394 | return TRUE;
|
|---|
| 395 |
|
|---|
| 396 | /* It is against the rules to archive a socket */
|
|---|
| 397 | if (S_ISSOCK(statbuf->st_mode)) {
|
|---|
| 398 | bb_error_msg("%s: socket ignored", fileName);
|
|---|
| 399 | return TRUE;
|
|---|
| 400 | }
|
|---|
| 401 |
|
|---|
| 402 | /*
|
|---|
| 403 | * Check to see if we are dealing with a hard link.
|
|---|
| 404 | * If so -
|
|---|
| 405 | * Treat the first occurance of a given dev/inode as a file while
|
|---|
| 406 | * treating any additional occurances as hard links. This is done
|
|---|
| 407 | * by adding the file information to the HardLinkInfo linked list.
|
|---|
| 408 | */
|
|---|
| 409 | tbInfo->hlInfo = NULL;
|
|---|
| 410 | if (!S_ISDIR(statbuf->st_mode) && statbuf->st_nlink > 1) {
|
|---|
| 411 | DBG("'%s': st_nlink > 1", header_name);
|
|---|
| 412 | tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
|
|---|
| 413 | if (tbInfo->hlInfo == NULL) {
|
|---|
| 414 | DBG("'%s': addHardLinkInfo", header_name);
|
|---|
| 415 | addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name);
|
|---|
| 416 | }
|
|---|
| 417 | }
|
|---|
| 418 |
|
|---|
| 419 | /* It is a bad idea to store the archive we are in the process of creating,
|
|---|
| 420 | * so check the device and inode to be sure that this particular file isn't
|
|---|
| 421 | * the new tarball */
|
|---|
| 422 | if (tbInfo->tarFileStatBuf.st_dev == statbuf->st_dev
|
|---|
| 423 | && tbInfo->tarFileStatBuf.st_ino == statbuf->st_ino
|
|---|
| 424 | ) {
|
|---|
| 425 | bb_error_msg("%s: file is the archive; skipping", fileName);
|
|---|
| 426 | return TRUE;
|
|---|
| 427 | }
|
|---|
| 428 |
|
|---|
| 429 | if (exclude_file(tbInfo->excludeList, header_name))
|
|---|
| 430 | return SKIP;
|
|---|
| 431 |
|
|---|
| 432 | #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
|
|---|
| 433 | if (strlen(header_name) >= NAME_SIZE) {
|
|---|
| 434 | bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
|
|---|
| 435 | return TRUE;
|
|---|
| 436 | }
|
|---|
| 437 | #endif
|
|---|
| 438 |
|
|---|
| 439 | /* Is this a regular file? */
|
|---|
| 440 | if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
|
|---|
| 441 | /* open the file we want to archive, and make sure all is well */
|
|---|
| 442 | inputFileFd = open_or_warn(fileName, O_RDONLY);
|
|---|
| 443 | if (inputFileFd < 0) {
|
|---|
| 444 | return FALSE;
|
|---|
| 445 | }
|
|---|
| 446 | }
|
|---|
| 447 |
|
|---|
| 448 | /* Add an entry to the tarball */
|
|---|
| 449 | if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
|
|---|
| 450 | return FALSE;
|
|---|
| 451 | }
|
|---|
| 452 |
|
|---|
| 453 | /* If it was a regular file, write out the body */
|
|---|
| 454 | if (inputFileFd >= 0) {
|
|---|
| 455 | size_t readSize;
|
|---|
| 456 | /* Write the file to the archive. */
|
|---|
| 457 | /* We record size into header first, */
|
|---|
| 458 | /* and then write out file. If file shrinks in between, */
|
|---|
| 459 | /* tar will be corrupted. So we don't allow for that. */
|
|---|
| 460 | /* NB: GNU tar 1.16 warns and pads with zeroes */
|
|---|
| 461 | /* or even seeks back and updates header */
|
|---|
| 462 | bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
|
|---|
| 463 | ////off_t readSize;
|
|---|
| 464 | ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
|
|---|
| 465 | ////if (readSize != statbuf->st_size && readSize >= 0) {
|
|---|
| 466 | //// bb_error_msg_and_die("short read from %s, aborting", fileName);
|
|---|
| 467 | ////}
|
|---|
| 468 |
|
|---|
| 469 | /* Check that file did not grow in between? */
|
|---|
| 470 | /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */
|
|---|
| 471 |
|
|---|
| 472 | close(inputFileFd);
|
|---|
| 473 |
|
|---|
| 474 | /* Pad the file up to the tar block size */
|
|---|
| 475 | /* (a few tricks here in the name of code size) */
|
|---|
| 476 | readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1);
|
|---|
| 477 | memset(block_buf, 0, readSize);
|
|---|
| 478 | xwrite(tbInfo->tarFd, block_buf, readSize);
|
|---|
| 479 | }
|
|---|
| 480 |
|
|---|
| 481 | return TRUE;
|
|---|
| 482 | }
|
|---|
| 483 |
|
|---|
| 484 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
|
|---|
| 485 | # if !(ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2)
|
|---|
| 486 | # define vfork_compressor(tar_fd, gzip) vfork_compressor(tar_fd)
|
|---|
| 487 | # endif
|
|---|
| 488 | /* Don't inline: vfork scares gcc and pessimizes code */
|
|---|
| 489 | static void NOINLINE vfork_compressor(int tar_fd, int gzip)
|
|---|
| 490 | {
|
|---|
| 491 | pid_t gzipPid;
|
|---|
| 492 | # if ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2
|
|---|
| 493 | const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
|
|---|
| 494 | # elif ENABLE_FEATURE_SEAMLESS_GZ
|
|---|
| 495 | const char *zip_exec = "gzip";
|
|---|
| 496 | # else /* only ENABLE_FEATURE_SEAMLESS_BZ2 */
|
|---|
| 497 | const char *zip_exec = "bzip2";
|
|---|
| 498 | # endif
|
|---|
| 499 | // On Linux, vfork never unpauses parent early, although standard
|
|---|
| 500 | // allows for that. Do we want to waste bytes checking for it?
|
|---|
| 501 | # define WAIT_FOR_CHILD 0
|
|---|
| 502 | volatile int vfork_exec_errno = 0;
|
|---|
| 503 | struct fd_pair gzipDataPipe;
|
|---|
| 504 | # if WAIT_FOR_CHILD
|
|---|
| 505 | struct fd_pair gzipStatusPipe;
|
|---|
| 506 | xpiped_pair(gzipStatusPipe);
|
|---|
| 507 | # endif
|
|---|
| 508 | xpiped_pair(gzipDataPipe);
|
|---|
| 509 |
|
|---|
| 510 | signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
|
|---|
| 511 |
|
|---|
| 512 | # if defined(__GNUC__) && __GNUC__
|
|---|
| 513 | /* Avoid vfork clobbering */
|
|---|
| 514 | (void) &zip_exec;
|
|---|
| 515 | # endif
|
|---|
| 516 |
|
|---|
| 517 | gzipPid = xvfork();
|
|---|
| 518 |
|
|---|
| 519 | if (gzipPid == 0) {
|
|---|
| 520 | /* child */
|
|---|
| 521 | /* NB: close _first_, then move fds! */
|
|---|
| 522 | close(gzipDataPipe.wr);
|
|---|
| 523 | # if WAIT_FOR_CHILD
|
|---|
| 524 | close(gzipStatusPipe.rd);
|
|---|
| 525 | /* gzipStatusPipe.wr will close only on exec -
|
|---|
| 526 | * parent waits for this close to happen */
|
|---|
| 527 | fcntl(gzipStatusPipe.wr, F_SETFD, FD_CLOEXEC);
|
|---|
| 528 | # endif
|
|---|
| 529 | xmove_fd(gzipDataPipe.rd, 0);
|
|---|
| 530 | xmove_fd(tar_fd, 1);
|
|---|
| 531 | /* exec gzip/bzip2 program/applet */
|
|---|
| 532 | BB_EXECLP(zip_exec, zip_exec, "-f", NULL);
|
|---|
| 533 | vfork_exec_errno = errno;
|
|---|
| 534 | _exit(EXIT_FAILURE);
|
|---|
| 535 | }
|
|---|
| 536 |
|
|---|
| 537 | /* parent */
|
|---|
| 538 | xmove_fd(gzipDataPipe.wr, tar_fd);
|
|---|
| 539 | close(gzipDataPipe.rd);
|
|---|
| 540 | # if WAIT_FOR_CHILD
|
|---|
| 541 | close(gzipStatusPipe.wr);
|
|---|
| 542 | while (1) {
|
|---|
| 543 | char buf;
|
|---|
| 544 | int n;
|
|---|
| 545 |
|
|---|
| 546 | /* Wait until child execs (or fails to) */
|
|---|
| 547 | n = full_read(gzipStatusPipe.rd, &buf, 1);
|
|---|
| 548 | if (n < 0 /* && errno == EAGAIN */)
|
|---|
| 549 | continue; /* try it again */
|
|---|
| 550 | }
|
|---|
| 551 | close(gzipStatusPipe.rd);
|
|---|
| 552 | # endif
|
|---|
| 553 | if (vfork_exec_errno) {
|
|---|
| 554 | errno = vfork_exec_errno;
|
|---|
| 555 | bb_perror_msg_and_die("can't execute '%s'", zip_exec);
|
|---|
| 556 | }
|
|---|
| 557 | }
|
|---|
| 558 | #endif /* ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 */
|
|---|
| 559 |
|
|---|
| 560 |
|
|---|
| 561 | /* gcc 4.2.1 inlines it, making code bigger */
|
|---|
| 562 | static NOINLINE int writeTarFile(int tar_fd, int verboseFlag,
|
|---|
| 563 | int dereferenceFlag, const llist_t *include,
|
|---|
| 564 | const llist_t *exclude, int gzip)
|
|---|
| 565 | {
|
|---|
| 566 | int errorFlag = FALSE;
|
|---|
| 567 | struct TarBallInfo tbInfo;
|
|---|
| 568 |
|
|---|
| 569 | tbInfo.hlInfoHead = NULL;
|
|---|
| 570 | tbInfo.tarFd = tar_fd;
|
|---|
| 571 | tbInfo.verboseFlag = verboseFlag;
|
|---|
| 572 |
|
|---|
| 573 | /* Store the stat info for the tarball's file, so
|
|---|
| 574 | * can avoid including the tarball into itself.... */
|
|---|
| 575 | xfstat(tbInfo.tarFd, &tbInfo.tarFileStatBuf, "can't stat tar file");
|
|---|
| 576 |
|
|---|
| 577 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
|
|---|
| 578 | if (gzip)
|
|---|
| 579 | vfork_compressor(tbInfo.tarFd, gzip);
|
|---|
| 580 | #endif
|
|---|
| 581 |
|
|---|
| 582 | tbInfo.excludeList = exclude;
|
|---|
| 583 |
|
|---|
| 584 | /* Read the directory/files and iterate over them one at a time */
|
|---|
| 585 | while (include) {
|
|---|
| 586 | if (!recursive_action(include->data, ACTION_RECURSE |
|
|---|
| 587 | (dereferenceFlag ? ACTION_FOLLOWLINKS : 0),
|
|---|
| 588 | writeFileToTarball, writeFileToTarball, &tbInfo, 0)
|
|---|
| 589 | ) {
|
|---|
| 590 | errorFlag = TRUE;
|
|---|
| 591 | }
|
|---|
| 592 | include = include->link;
|
|---|
| 593 | }
|
|---|
| 594 | /* Write two empty blocks to the end of the archive */
|
|---|
| 595 | memset(block_buf, 0, 2*TAR_BLOCK_SIZE);
|
|---|
| 596 | xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE);
|
|---|
| 597 |
|
|---|
| 598 | /* To be pedantically correct, we would check if the tarball
|
|---|
| 599 | * is smaller than 20 tar blocks, and pad it if it was smaller,
|
|---|
| 600 | * but that isn't necessary for GNU tar interoperability, and
|
|---|
| 601 | * so is considered a waste of space */
|
|---|
| 602 |
|
|---|
| 603 | /* Close so the child process (if any) will exit */
|
|---|
| 604 | close(tbInfo.tarFd);
|
|---|
| 605 |
|
|---|
| 606 | /* Hang up the tools, close up shop, head home */
|
|---|
| 607 | if (ENABLE_FEATURE_CLEAN_UP)
|
|---|
| 608 | freeHardLinkInfo(&tbInfo.hlInfoHead);
|
|---|
| 609 |
|
|---|
| 610 | if (errorFlag)
|
|---|
| 611 | bb_error_msg("error exit delayed from previous errors");
|
|---|
| 612 |
|
|---|
| 613 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
|
|---|
| 614 | if (gzip) {
|
|---|
| 615 | int status;
|
|---|
| 616 | if (safe_waitpid(-1, &status, 0) == -1)
|
|---|
| 617 | bb_perror_msg("waitpid");
|
|---|
| 618 | else if (!WIFEXITED(status) || WEXITSTATUS(status))
|
|---|
| 619 | /* gzip was killed or has exited with nonzero! */
|
|---|
| 620 | errorFlag = TRUE;
|
|---|
| 621 | }
|
|---|
| 622 | #endif
|
|---|
| 623 | return errorFlag;
|
|---|
| 624 | }
|
|---|
| 625 | #else
|
|---|
| 626 | int writeTarFile(int tar_fd, int verboseFlag,
|
|---|
| 627 | int dereferenceFlag, const llist_t *include,
|
|---|
| 628 | const llist_t *exclude, int gzip);
|
|---|
| 629 | #endif /* FEATURE_TAR_CREATE */
|
|---|
| 630 |
|
|---|
| 631 | #if ENABLE_FEATURE_TAR_FROM
|
|---|
| 632 | static llist_t *append_file_list_to_list(llist_t *list)
|
|---|
| 633 | {
|
|---|
| 634 | FILE *src_stream;
|
|---|
| 635 | char *line;
|
|---|
| 636 | llist_t *newlist = NULL;
|
|---|
| 637 |
|
|---|
| 638 | while (list) {
|
|---|
| 639 | src_stream = xfopen_for_read(llist_pop(&list));
|
|---|
| 640 | while ((line = xmalloc_fgetline(src_stream)) != NULL) {
|
|---|
| 641 | /* kill trailing '/' unless the string is just "/" */
|
|---|
| 642 | char *cp = last_char_is(line, '/');
|
|---|
| 643 | if (cp > line)
|
|---|
| 644 | *cp = '\0';
|
|---|
| 645 | llist_add_to(&newlist, line);
|
|---|
| 646 | }
|
|---|
| 647 | fclose(src_stream);
|
|---|
| 648 | }
|
|---|
| 649 | return newlist;
|
|---|
| 650 | }
|
|---|
| 651 | #else
|
|---|
| 652 | # define append_file_list_to_list(x) 0
|
|---|
| 653 | #endif
|
|---|
| 654 |
|
|---|
| 655 | #if ENABLE_FEATURE_SEAMLESS_Z
|
|---|
| 656 | static char FAST_FUNC get_header_tar_Z(archive_handle_t *archive_handle)
|
|---|
| 657 | {
|
|---|
| 658 | /* Can't lseek over pipes */
|
|---|
| 659 | archive_handle->seek = seek_by_read;
|
|---|
| 660 |
|
|---|
| 661 | /* do the decompression, and cleanup */
|
|---|
| 662 | if (xread_char(archive_handle->src_fd) != 0x1f
|
|---|
| 663 | || xread_char(archive_handle->src_fd) != 0x9d
|
|---|
| 664 | ) {
|
|---|
| 665 | bb_error_msg_and_die("invalid magic");
|
|---|
| 666 | }
|
|---|
| 667 |
|
|---|
| 668 | open_transformer(archive_handle->src_fd, unpack_Z_stream, "uncompress");
|
|---|
| 669 | archive_handle->offset = 0;
|
|---|
| 670 | while (get_header_tar(archive_handle) == EXIT_SUCCESS)
|
|---|
| 671 | continue;
|
|---|
| 672 |
|
|---|
| 673 | /* Can only do one file at a time */
|
|---|
| 674 | return EXIT_FAILURE;
|
|---|
| 675 | }
|
|---|
| 676 | #else
|
|---|
| 677 | # define get_header_tar_Z NULL
|
|---|
| 678 | #endif
|
|---|
| 679 |
|
|---|
| 680 | #ifdef CHECK_FOR_CHILD_EXITCODE
|
|---|
| 681 | /* Looks like it isn't needed - tar detects malformed (truncated)
|
|---|
| 682 | * archive if e.g. bunzip2 fails */
|
|---|
| 683 | static int child_error;
|
|---|
| 684 |
|
|---|
| 685 | static void handle_SIGCHLD(int status)
|
|---|
| 686 | {
|
|---|
| 687 | /* Actually, 'status' is a signo. We reuse it for other needs */
|
|---|
| 688 |
|
|---|
| 689 | /* Wait for any child without blocking */
|
|---|
| 690 | if (wait_any_nohang(&status) < 0)
|
|---|
| 691 | /* wait failed?! I'm confused... */
|
|---|
| 692 | return;
|
|---|
| 693 |
|
|---|
| 694 | if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
|
|---|
| 695 | /* child exited with 0 */
|
|---|
| 696 | return;
|
|---|
| 697 | /* Cannot happen?
|
|---|
| 698 | if (!WIFSIGNALED(status) && !WIFEXITED(status)) return; */
|
|---|
| 699 | child_error = 1;
|
|---|
| 700 | }
|
|---|
| 701 | #endif
|
|---|
| 702 |
|
|---|
| 703 | //usage:#define tar_trivial_usage
|
|---|
| 704 | //usage: "-[" IF_FEATURE_TAR_CREATE("c") "xt" IF_FEATURE_SEAMLESS_GZ("z")
|
|---|
| 705 | //usage: IF_FEATURE_SEAMLESS_BZ2("j") IF_FEATURE_SEAMLESS_LZMA("a")
|
|---|
| 706 | //usage: IF_FEATURE_SEAMLESS_Z("Z") IF_FEATURE_TAR_NOPRESERVE_TIME("m") "vO] "
|
|---|
| 707 | //usage: IF_FEATURE_TAR_FROM("[-X FILE] ")
|
|---|
| 708 | //usage: "[-f TARFILE] [-C DIR] [FILE]..."
|
|---|
| 709 | //usage:#define tar_full_usage "\n\n"
|
|---|
| 710 | //usage: IF_FEATURE_TAR_CREATE("Create, extract, ")
|
|---|
| 711 | //usage: IF_NOT_FEATURE_TAR_CREATE("Extract ")
|
|---|
| 712 | //usage: "or list files from a tar file\n"
|
|---|
| 713 | //usage: "\nOperation:"
|
|---|
| 714 | //usage: IF_FEATURE_TAR_CREATE(
|
|---|
| 715 | //usage: "\n c Create"
|
|---|
| 716 | //usage: )
|
|---|
| 717 | //usage: "\n x Extract"
|
|---|
| 718 | //usage: "\n t List"
|
|---|
| 719 | //usage: "\nOptions:"
|
|---|
| 720 | //usage: "\n f Name of TARFILE ('-' for stdin/out)"
|
|---|
| 721 | //usage: "\n C Change to DIR before operation"
|
|---|
| 722 | //usage: "\n v Verbose"
|
|---|
| 723 | //usage: IF_FEATURE_SEAMLESS_GZ(
|
|---|
| 724 | //usage: "\n z (De)compress using gzip"
|
|---|
| 725 | //usage: )
|
|---|
| 726 | //usage: IF_FEATURE_SEAMLESS_BZ2(
|
|---|
| 727 | //usage: "\n j (De)compress using bzip2"
|
|---|
| 728 | //usage: )
|
|---|
| 729 | //usage: IF_FEATURE_SEAMLESS_LZMA(
|
|---|
| 730 | //usage: "\n a (De)compress using lzma"
|
|---|
| 731 | //usage: )
|
|---|
| 732 | //usage: IF_FEATURE_SEAMLESS_Z(
|
|---|
| 733 | //usage: "\n Z (De)compress using compress"
|
|---|
| 734 | //usage: )
|
|---|
| 735 | //usage: "\n O Extract to stdout"
|
|---|
| 736 | //usage: IF_FEATURE_TAR_CREATE(
|
|---|
| 737 | //usage: "\n h Follow symlinks"
|
|---|
| 738 | //usage: )
|
|---|
| 739 | //usage: IF_FEATURE_TAR_NOPRESERVE_TIME(
|
|---|
| 740 | //usage: "\n m Don't restore mtime"
|
|---|
| 741 | //usage: )
|
|---|
| 742 | //usage: IF_FEATURE_TAR_FROM(
|
|---|
| 743 | //usage: IF_FEATURE_TAR_LONG_OPTIONS(
|
|---|
| 744 | //usage: "\n exclude File to exclude"
|
|---|
| 745 | //usage: )
|
|---|
| 746 | //usage: "\n X File with names to exclude"
|
|---|
| 747 | //usage: "\n T File with names to include"
|
|---|
| 748 | //usage: )
|
|---|
| 749 | //usage:
|
|---|
| 750 | //usage:#define tar_example_usage
|
|---|
| 751 | //usage: "$ zcat /tmp/tarball.tar.gz | tar -xf -\n"
|
|---|
| 752 | //usage: "$ tar -cf /tmp/tarball.tar /usr/local\n"
|
|---|
| 753 |
|
|---|
| 754 | // Supported but aren't in --help:
|
|---|
| 755 | // o no-same-owner
|
|---|
| 756 | // p same-permissions
|
|---|
| 757 | // k keep-old
|
|---|
| 758 | // numeric-owner
|
|---|
| 759 | // no-same-permissions
|
|---|
| 760 | // overwrite
|
|---|
| 761 | //IF_FEATURE_TAR_TO_COMMAND(
|
|---|
| 762 | // to-command
|
|---|
| 763 | //)
|
|---|
| 764 |
|
|---|
| 765 | enum {
|
|---|
| 766 | OPTBIT_KEEP_OLD = 8,
|
|---|
| 767 | IF_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)
|
|---|
| 768 | IF_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,)
|
|---|
| 769 | IF_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2 ,)
|
|---|
| 770 | IF_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA ,)
|
|---|
| 771 | IF_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,)
|
|---|
| 772 | IF_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,)
|
|---|
| 773 | IF_FEATURE_SEAMLESS_GZ( OPTBIT_GZIP ,)
|
|---|
| 774 | IF_FEATURE_SEAMLESS_Z( OPTBIT_COMPRESS ,) // 16th bit
|
|---|
| 775 | IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,)
|
|---|
| 776 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS
|
|---|
| 777 | IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND ,)
|
|---|
| 778 | OPTBIT_NUMERIC_OWNER,
|
|---|
| 779 | OPTBIT_NOPRESERVE_PERM,
|
|---|
| 780 | OPTBIT_OVERWRITE,
|
|---|
| 781 | #endif
|
|---|
| 782 | OPT_TEST = 1 << 0, // t
|
|---|
| 783 | OPT_EXTRACT = 1 << 1, // x
|
|---|
| 784 | OPT_BASEDIR = 1 << 2, // C
|
|---|
| 785 | OPT_TARNAME = 1 << 3, // f
|
|---|
| 786 | OPT_2STDOUT = 1 << 4, // O
|
|---|
| 787 | OPT_NOPRESERVE_OWNER = 1 << 5, // o == no-same-owner
|
|---|
| 788 | OPT_P = 1 << 6, // p
|
|---|
| 789 | OPT_VERBOSE = 1 << 7, // v
|
|---|
| 790 | OPT_KEEP_OLD = 1 << 8, // k
|
|---|
| 791 | OPT_CREATE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_CREATE )) + 0, // c
|
|---|
| 792 | OPT_DEREFERENCE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_DEREFERENCE )) + 0, // h
|
|---|
| 793 | OPT_BZIP2 = IF_FEATURE_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2 )) + 0, // j
|
|---|
| 794 | OPT_LZMA = IF_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA )) + 0, // a
|
|---|
| 795 | OPT_INCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_INCLUDE_FROM)) + 0, // T
|
|---|
| 796 | OPT_EXCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X
|
|---|
| 797 | OPT_GZIP = IF_FEATURE_SEAMLESS_GZ( (1 << OPTBIT_GZIP )) + 0, // z
|
|---|
| 798 | OPT_COMPRESS = IF_FEATURE_SEAMLESS_Z( (1 << OPTBIT_COMPRESS )) + 0, // Z
|
|---|
| 799 | OPT_NOPRESERVE_TIME = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m
|
|---|
| 800 | OPT_2COMMAND = IF_FEATURE_TAR_TO_COMMAND( (1 << OPTBIT_2COMMAND )) + 0, // to-command
|
|---|
| 801 | OPT_NUMERIC_OWNER = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NUMERIC_OWNER )) + 0, // numeric-owner
|
|---|
| 802 | OPT_NOPRESERVE_PERM = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions
|
|---|
| 803 | OPT_OVERWRITE = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE )) + 0, // overwrite
|
|---|
| 804 | };
|
|---|
| 805 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS
|
|---|
| 806 | static const char tar_longopts[] ALIGN1 =
|
|---|
| 807 | "list\0" No_argument "t"
|
|---|
| 808 | "extract\0" No_argument "x"
|
|---|
| 809 | "directory\0" Required_argument "C"
|
|---|
| 810 | "file\0" Required_argument "f"
|
|---|
| 811 | "to-stdout\0" No_argument "O"
|
|---|
| 812 | /* do not restore owner */
|
|---|
| 813 | /* Note: GNU tar handles 'o' as no-same-owner only on extract,
|
|---|
| 814 | * on create, 'o' is --old-archive. We do not support --old-archive. */
|
|---|
| 815 | "no-same-owner\0" No_argument "o"
|
|---|
| 816 | "same-permissions\0" No_argument "p"
|
|---|
| 817 | "verbose\0" No_argument "v"
|
|---|
| 818 | "keep-old\0" No_argument "k"
|
|---|
| 819 | # if ENABLE_FEATURE_TAR_CREATE
|
|---|
| 820 | "create\0" No_argument "c"
|
|---|
| 821 | "dereference\0" No_argument "h"
|
|---|
| 822 | # endif
|
|---|
| 823 | # if ENABLE_FEATURE_SEAMLESS_BZ2
|
|---|
| 824 | "bzip2\0" No_argument "j"
|
|---|
| 825 | # endif
|
|---|
| 826 | # if ENABLE_FEATURE_SEAMLESS_LZMA
|
|---|
| 827 | "lzma\0" No_argument "a"
|
|---|
| 828 | # endif
|
|---|
| 829 | # if ENABLE_FEATURE_TAR_FROM
|
|---|
| 830 | "files-from\0" Required_argument "T"
|
|---|
| 831 | "exclude-from\0" Required_argument "X"
|
|---|
| 832 | # endif
|
|---|
| 833 | # if ENABLE_FEATURE_SEAMLESS_GZ
|
|---|
| 834 | "gzip\0" No_argument "z"
|
|---|
| 835 | # endif
|
|---|
| 836 | # if ENABLE_FEATURE_SEAMLESS_Z
|
|---|
| 837 | "compress\0" No_argument "Z"
|
|---|
| 838 | # endif
|
|---|
| 839 | # if ENABLE_FEATURE_TAR_NOPRESERVE_TIME
|
|---|
| 840 | "touch\0" No_argument "m"
|
|---|
| 841 | # endif
|
|---|
| 842 | # if ENABLE_FEATURE_TAR_TO_COMMAND
|
|---|
| 843 | "to-command\0" Required_argument "\xfb"
|
|---|
| 844 | # endif
|
|---|
| 845 | /* use numeric uid/gid from tar header, not textual */
|
|---|
| 846 | "numeric-owner\0" No_argument "\xfc"
|
|---|
| 847 | /* do not restore mode */
|
|---|
| 848 | "no-same-permissions\0" No_argument "\xfd"
|
|---|
| 849 | /* on unpack, open with O_TRUNC and !O_EXCL */
|
|---|
| 850 | "overwrite\0" No_argument "\xfe"
|
|---|
| 851 | /* --exclude takes next bit position in option mask, */
|
|---|
| 852 | /* therefore we have to put it _after_ --no-same-permissions */
|
|---|
| 853 | # if ENABLE_FEATURE_TAR_FROM
|
|---|
| 854 | "exclude\0" Required_argument "\xff"
|
|---|
| 855 | # endif
|
|---|
| 856 | ;
|
|---|
| 857 | #endif
|
|---|
| 858 |
|
|---|
| 859 | int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|---|
| 860 | int tar_main(int argc UNUSED_PARAM, char **argv)
|
|---|
| 861 | {
|
|---|
| 862 | char FAST_FUNC (*get_header_ptr)(archive_handle_t *) = get_header_tar;
|
|---|
| 863 | archive_handle_t *tar_handle;
|
|---|
| 864 | char *base_dir = NULL;
|
|---|
| 865 | const char *tar_filename = "-";
|
|---|
| 866 | unsigned opt;
|
|---|
| 867 | int verboseFlag = 0;
|
|---|
| 868 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
|
|---|
| 869 | llist_t *excludes = NULL;
|
|---|
| 870 | #endif
|
|---|
| 871 |
|
|---|
| 872 | /* Initialise default values */
|
|---|
| 873 | tar_handle = init_handle();
|
|---|
| 874 | tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS
|
|---|
| 875 | | ARCHIVE_RESTORE_DATE
|
|---|
| 876 | | ARCHIVE_UNLINK_OLD;
|
|---|
| 877 |
|
|---|
| 878 | /* Apparently only root's tar preserves perms (see bug 3844) */
|
|---|
| 879 | if (getuid() != 0)
|
|---|
| 880 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
|
|---|
| 881 |
|
|---|
| 882 | /* Prepend '-' to the first argument if required */
|
|---|
| 883 | opt_complementary = "--:" // first arg is options
|
|---|
| 884 | "tt:vv:" // count -t,-v
|
|---|
| 885 | "?:" // bail out with usage instead of error return
|
|---|
| 886 | "X::T::" // cumulative lists
|
|---|
| 887 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
|
|---|
| 888 | "\xff::" // cumulative lists for --exclude
|
|---|
| 889 | #endif
|
|---|
| 890 | IF_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
|
|---|
| 891 | IF_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
|
|---|
| 892 | IF_NOT_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive
|
|---|
| 893 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS
|
|---|
| 894 | applet_long_options = tar_longopts;
|
|---|
| 895 | #endif
|
|---|
| 896 | #if ENABLE_DESKTOP
|
|---|
| 897 | if (argv[1] && argv[1][0] != '-') {
|
|---|
| 898 | /* Compat:
|
|---|
| 899 | * 1st argument without dash handles options with parameters
|
|---|
| 900 | * differently from dashed one: it takes *next argv[i]*
|
|---|
| 901 | * as paramenter even if there are more chars in 1st argument:
|
|---|
| 902 | * "tar fx TARFILE" - "x" is not taken as f's param
|
|---|
| 903 | * but is interpreted as -x option
|
|---|
| 904 | * "tar -xf TARFILE" - dashed equivalent of the above
|
|---|
| 905 | * "tar -fx ..." - "x" is taken as f's param
|
|---|
| 906 | * getopt32 wouldn't handle 1st command correctly.
|
|---|
| 907 | * Unfortunately, people do use such commands.
|
|---|
| 908 | * We massage argv[1] to work around it by moving 'f'
|
|---|
| 909 | * to the end of the string.
|
|---|
| 910 | * More contrived "tar fCx TARFILE DIR" still fails,
|
|---|
| 911 | * but such commands are much less likely to be used.
|
|---|
| 912 | */
|
|---|
| 913 | char *f = strchr(argv[1], 'f');
|
|---|
| 914 | if (f) {
|
|---|
| 915 | while (f[1] != '\0') {
|
|---|
| 916 | *f = f[1];
|
|---|
| 917 | f++;
|
|---|
| 918 | }
|
|---|
| 919 | *f = 'f';
|
|---|
| 920 | }
|
|---|
| 921 | }
|
|---|
| 922 | #endif
|
|---|
| 923 | opt = getopt32(argv,
|
|---|
| 924 | "txC:f:Oopvk"
|
|---|
| 925 | IF_FEATURE_TAR_CREATE( "ch" )
|
|---|
| 926 | IF_FEATURE_SEAMLESS_BZ2( "j" )
|
|---|
| 927 | IF_FEATURE_SEAMLESS_LZMA("a" )
|
|---|
| 928 | IF_FEATURE_TAR_FROM( "T:X:")
|
|---|
| 929 | IF_FEATURE_SEAMLESS_GZ( "z" )
|
|---|
| 930 | IF_FEATURE_SEAMLESS_Z( "Z" )
|
|---|
| 931 | IF_FEATURE_TAR_NOPRESERVE_TIME("m")
|
|---|
| 932 | , &base_dir // -C dir
|
|---|
| 933 | , &tar_filename // -f filename
|
|---|
| 934 | IF_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
|
|---|
| 935 | IF_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X
|
|---|
| 936 | IF_FEATURE_TAR_TO_COMMAND(, &(tar_handle->tar__to_command)) // --to-command
|
|---|
| 937 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
|
|---|
| 938 | , &excludes // --exclude
|
|---|
| 939 | #endif
|
|---|
| 940 | , &verboseFlag // combined count for -t and -v
|
|---|
| 941 | , &verboseFlag // combined count for -t and -v
|
|---|
| 942 | );
|
|---|
| 943 | //bb_error_msg("opt:%08x", opt);
|
|---|
| 944 | argv += optind;
|
|---|
| 945 |
|
|---|
| 946 | if (verboseFlag) tar_handle->action_header = header_verbose_list;
|
|---|
| 947 | if (verboseFlag == 1) tar_handle->action_header = header_list;
|
|---|
| 948 |
|
|---|
| 949 | if (opt & OPT_EXTRACT)
|
|---|
| 950 | tar_handle->action_data = data_extract_all;
|
|---|
| 951 |
|
|---|
| 952 | if (opt & OPT_2STDOUT)
|
|---|
| 953 | tar_handle->action_data = data_extract_to_stdout;
|
|---|
| 954 |
|
|---|
| 955 | if (opt & OPT_2COMMAND) {
|
|---|
| 956 | putenv((char*)"TAR_FILETYPE=f");
|
|---|
| 957 | signal(SIGPIPE, SIG_IGN);
|
|---|
| 958 | tar_handle->action_data = data_extract_to_command;
|
|---|
| 959 | }
|
|---|
| 960 |
|
|---|
| 961 | if (opt & OPT_KEEP_OLD)
|
|---|
| 962 | tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
|
|---|
| 963 |
|
|---|
| 964 | if (opt & OPT_NUMERIC_OWNER)
|
|---|
| 965 | tar_handle->ah_flags |= ARCHIVE_NUMERIC_OWNER;
|
|---|
| 966 |
|
|---|
| 967 | if (opt & OPT_NOPRESERVE_OWNER)
|
|---|
| 968 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_OWNER;
|
|---|
| 969 |
|
|---|
| 970 | if (opt & OPT_NOPRESERVE_PERM)
|
|---|
| 971 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
|
|---|
| 972 |
|
|---|
| 973 | if (opt & OPT_OVERWRITE) {
|
|---|
| 974 | tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
|
|---|
| 975 | tar_handle->ah_flags |= ARCHIVE_O_TRUNC;
|
|---|
| 976 | }
|
|---|
| 977 |
|
|---|
| 978 | if (opt & OPT_GZIP)
|
|---|
| 979 | get_header_ptr = get_header_tar_gz;
|
|---|
| 980 |
|
|---|
| 981 | if (opt & OPT_BZIP2)
|
|---|
| 982 | get_header_ptr = get_header_tar_bz2;
|
|---|
| 983 |
|
|---|
| 984 | if (opt & OPT_LZMA)
|
|---|
| 985 | get_header_ptr = get_header_tar_lzma;
|
|---|
| 986 |
|
|---|
| 987 | if (opt & OPT_COMPRESS)
|
|---|
| 988 | get_header_ptr = get_header_tar_Z;
|
|---|
| 989 |
|
|---|
| 990 | if (opt & OPT_NOPRESERVE_TIME)
|
|---|
| 991 | tar_handle->ah_flags &= ~ARCHIVE_RESTORE_DATE;
|
|---|
| 992 |
|
|---|
| 993 | #if ENABLE_FEATURE_TAR_FROM
|
|---|
| 994 | tar_handle->reject = append_file_list_to_list(tar_handle->reject);
|
|---|
| 995 | # if ENABLE_FEATURE_TAR_LONG_OPTIONS
|
|---|
| 996 | /* Append excludes to reject */
|
|---|
| 997 | while (excludes) {
|
|---|
| 998 | llist_t *next = excludes->link;
|
|---|
| 999 | excludes->link = tar_handle->reject;
|
|---|
| 1000 | tar_handle->reject = excludes;
|
|---|
| 1001 | excludes = next;
|
|---|
| 1002 | }
|
|---|
| 1003 | # endif
|
|---|
| 1004 | tar_handle->accept = append_file_list_to_list(tar_handle->accept);
|
|---|
| 1005 | #endif
|
|---|
| 1006 |
|
|---|
| 1007 | /* Setup an array of filenames to work with */
|
|---|
| 1008 | /* TODO: This is the same as in ar, make a separate function? */
|
|---|
| 1009 | while (*argv) {
|
|---|
| 1010 | /* kill trailing '/' unless the string is just "/" */
|
|---|
| 1011 | char *cp = last_char_is(*argv, '/');
|
|---|
| 1012 | if (cp > *argv)
|
|---|
| 1013 | *cp = '\0';
|
|---|
| 1014 | llist_add_to_end(&tar_handle->accept, *argv);
|
|---|
| 1015 | argv++;
|
|---|
| 1016 | }
|
|---|
| 1017 |
|
|---|
| 1018 | if (tar_handle->accept || tar_handle->reject)
|
|---|
| 1019 | tar_handle->filter = filter_accept_reject_list;
|
|---|
| 1020 |
|
|---|
| 1021 | /* Open the tar file */
|
|---|
| 1022 | {
|
|---|
| 1023 | int tar_fd = STDIN_FILENO;
|
|---|
| 1024 | int flags = O_RDONLY;
|
|---|
| 1025 |
|
|---|
| 1026 | if (opt & OPT_CREATE) {
|
|---|
| 1027 | /* Make sure there is at least one file to tar up */
|
|---|
| 1028 | if (tar_handle->accept == NULL)
|
|---|
| 1029 | bb_error_msg_and_die("empty archive");
|
|---|
| 1030 |
|
|---|
| 1031 | tar_fd = STDOUT_FILENO;
|
|---|
| 1032 | /* Mimicking GNU tar 1.15.1: */
|
|---|
| 1033 | flags = O_WRONLY | O_CREAT | O_TRUNC;
|
|---|
| 1034 | }
|
|---|
| 1035 |
|
|---|
| 1036 | if (LONE_DASH(tar_filename)) {
|
|---|
| 1037 | tar_handle->src_fd = tar_fd;
|
|---|
| 1038 | tar_handle->seek = seek_by_read;
|
|---|
| 1039 | } else {
|
|---|
| 1040 | if (ENABLE_FEATURE_TAR_AUTODETECT
|
|---|
| 1041 | && flags == O_RDONLY
|
|---|
| 1042 | && get_header_ptr == get_header_tar
|
|---|
| 1043 | ) {
|
|---|
| 1044 | tar_handle->src_fd = open_zipped(tar_filename);
|
|---|
| 1045 | if (tar_handle->src_fd < 0)
|
|---|
| 1046 | bb_perror_msg_and_die("can't open '%s'", tar_filename);
|
|---|
| 1047 | } else {
|
|---|
| 1048 | tar_handle->src_fd = xopen(tar_filename, flags);
|
|---|
| 1049 | }
|
|---|
| 1050 | }
|
|---|
| 1051 | }
|
|---|
| 1052 |
|
|---|
| 1053 | if (base_dir)
|
|---|
| 1054 | xchdir(base_dir);
|
|---|
| 1055 |
|
|---|
| 1056 | #ifdef CHECK_FOR_CHILD_EXITCODE
|
|---|
| 1057 | /* We need to know whether child (gzip/bzip/etc) exits abnormally */
|
|---|
| 1058 | signal(SIGCHLD, handle_SIGCHLD);
|
|---|
| 1059 | #endif
|
|---|
| 1060 |
|
|---|
| 1061 | /* Create an archive */
|
|---|
| 1062 | if (opt & OPT_CREATE) {
|
|---|
| 1063 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2
|
|---|
| 1064 | int zipMode = 0;
|
|---|
| 1065 | if (ENABLE_FEATURE_SEAMLESS_GZ && (opt & OPT_GZIP))
|
|---|
| 1066 | zipMode = 1;
|
|---|
| 1067 | if (ENABLE_FEATURE_SEAMLESS_BZ2 && (opt & OPT_BZIP2))
|
|---|
| 1068 | zipMode = 2;
|
|---|
| 1069 | #endif
|
|---|
| 1070 | /* NB: writeTarFile() closes tar_handle->src_fd */
|
|---|
| 1071 | return writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE,
|
|---|
| 1072 | tar_handle->accept,
|
|---|
| 1073 | tar_handle->reject, zipMode);
|
|---|
| 1074 | }
|
|---|
| 1075 |
|
|---|
| 1076 | while (get_header_ptr(tar_handle) == EXIT_SUCCESS)
|
|---|
| 1077 | continue;
|
|---|
| 1078 |
|
|---|
| 1079 | /* Check that every file that should have been extracted was */
|
|---|
| 1080 | while (tar_handle->accept) {
|
|---|
| 1081 | if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
|
|---|
| 1082 | && !find_list_entry(tar_handle->passed, tar_handle->accept->data)
|
|---|
| 1083 | ) {
|
|---|
| 1084 | bb_error_msg_and_die("%s: not found in archive",
|
|---|
| 1085 | tar_handle->accept->data);
|
|---|
| 1086 | }
|
|---|
| 1087 | tar_handle->accept = tar_handle->accept->link;
|
|---|
| 1088 | }
|
|---|
| 1089 | if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */)
|
|---|
| 1090 | close(tar_handle->src_fd);
|
|---|
| 1091 |
|
|---|
| 1092 | return EXIT_SUCCESS;
|
|---|
| 1093 | }
|
|---|
