1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * chattr.c - Change file attributes on an ext2 file system
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4 | *
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5 | * Copyright (C) 1993, 1994 Remy Card <card@masi.ibp.fr>
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6 | * Laboratoire MASI, Institut Blaise Pascal
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7 | * Universite Pierre et Marie Curie (Paris VI)
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8 | *
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9 | * This file can be redistributed under the terms of the GNU General
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10 | * Public License
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11 | */
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12 |
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13 | /*
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14 | * History:
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15 | * 93/10/30 - Creation
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16 | * 93/11/13 - Replace stat() calls by lstat() to avoid loops
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17 | * 94/02/27 - Integrated in Ted's distribution
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18 | * 98/12/29 - Ignore symlinks when working recursively (G M Sipe)
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19 | * 98/12/29 - Display version info only when -V specified (G M Sipe)
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20 | */
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21 |
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22 | //usage:#define chattr_trivial_usage
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23 | //usage: "[-R] [-+=AacDdijsStTu] [-v VERSION] [FILE]..."
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24 | //usage:#define chattr_full_usage "\n\n"
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25 | //usage: "Change file attributes on an ext2 fs\n"
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26 | //usage: "\nModifiers:"
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27 | //usage: "\n - Remove attributes"
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28 | //usage: "\n + Add attributes"
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29 | //usage: "\n = Set attributes"
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30 | //usage: "\nAttributes:"
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31 | //usage: "\n A Don't track atime"
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32 | //usage: "\n a Append mode only"
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33 | //usage: "\n c Enable compress"
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34 | //usage: "\n D Write dir contents synchronously"
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35 | //usage: "\n d Don't backup with dump"
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36 | //usage: "\n i Cannot be modified (immutable)"
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37 | //usage: "\n j Write all data to journal first"
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38 | //usage: "\n s Zero disk storage when deleted"
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39 | //usage: "\n S Write file contents synchronously"
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40 | //usage: "\n t Disable tail-merging of partial blocks with other files"
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41 | //usage: "\n u Allow file to be undeleted"
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42 | //usage: "\n -R Recurse"
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43 | //usage: "\n -v Set the file's version/generation number"
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44 |
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45 | #include "libbb.h"
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46 | #include "e2fs_lib.h"
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47 |
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48 | #define OPT_ADD 1
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49 | #define OPT_REM 2
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50 | #define OPT_SET 4
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51 | #define OPT_SET_VER 8
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52 |
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53 | struct globals {
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54 | unsigned long version;
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55 | unsigned long af;
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56 | unsigned long rf;
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57 | smallint flags;
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58 | smallint recursive;
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59 | };
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60 |
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61 | static unsigned long get_flag(char c)
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62 | {
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63 | const char *fp = strchr(e2attr_flags_sname_chattr, c);
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64 | if (fp)
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65 | return e2attr_flags_value_chattr[fp - e2attr_flags_sname_chattr];
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66 | bb_show_usage();
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67 | }
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68 |
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69 | static int decode_arg(const char *arg, struct globals *gp)
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70 | {
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71 | unsigned long *fl;
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72 | char opt = *arg++;
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73 |
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74 | fl = &gp->af;
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75 | if (opt == '-') {
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76 | gp->flags |= OPT_REM;
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77 | fl = &gp->rf;
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78 | } else if (opt == '+') {
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79 | gp->flags |= OPT_ADD;
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80 | } else if (opt == '=') {
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81 | gp->flags |= OPT_SET;
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82 | } else
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83 | return 0;
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84 |
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85 | while (*arg)
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86 | *fl |= get_flag(*arg++);
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87 |
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88 | return 1;
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89 | }
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90 |
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91 | static void change_attributes(const char *name, struct globals *gp);
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92 |
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93 | static int FAST_FUNC chattr_dir_proc(const char *dir_name, struct dirent *de, void *gp)
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94 | {
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95 | char *path = concat_subpath_file(dir_name, de->d_name);
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96 | /* path is NULL if de->d_name is "." or "..", else... */
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97 | if (path) {
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98 | change_attributes(path, gp);
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99 | free(path);
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100 | }
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101 | return 0;
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102 | }
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103 |
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104 | static void change_attributes(const char *name, struct globals *gp)
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105 | {
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106 | unsigned long fsflags;
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107 | struct stat st;
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108 |
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109 | if (lstat(name, &st) != 0) {
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110 | bb_perror_msg("stat %s", name);
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111 | return;
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112 | }
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113 | if (S_ISLNK(st.st_mode) && gp->recursive)
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114 | return;
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115 |
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116 | /* Don't try to open device files, fifos etc. We probably
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117 | * ought to display an error if the file was explicitly given
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118 | * on the command line (whether or not recursive was
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119 | * requested). */
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120 | if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode))
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121 | return;
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122 |
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123 | if (gp->flags & OPT_SET_VER)
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124 | if (fsetversion(name, gp->version) != 0)
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125 | bb_perror_msg("setting version on %s", name);
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126 |
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127 | if (gp->flags & OPT_SET) {
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128 | fsflags = gp->af;
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129 | } else {
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130 | if (fgetflags(name, &fsflags) != 0) {
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131 | bb_perror_msg("reading flags on %s", name);
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132 | goto skip_setflags;
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133 | }
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134 | /*if (gp->flags & OPT_REM) - not needed, rf is zero otherwise */
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135 | fsflags &= ~gp->rf;
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136 | /*if (gp->flags & OPT_ADD) - not needed, af is zero otherwise */
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137 | fsflags |= gp->af;
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138 | /* What is this? And why it's not done for SET case? */
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139 | if (!S_ISDIR(st.st_mode))
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140 | fsflags &= ~EXT2_DIRSYNC_FL;
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141 | }
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142 | if (fsetflags(name, fsflags) != 0)
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143 | bb_perror_msg("setting flags on %s", name);
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144 |
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145 | skip_setflags:
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146 | if (gp->recursive && S_ISDIR(st.st_mode))
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147 | iterate_on_dir(name, chattr_dir_proc, gp);
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148 | }
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149 |
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150 | int chattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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151 | int chattr_main(int argc UNUSED_PARAM, char **argv)
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152 | {
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153 | struct globals g;
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154 | char *arg;
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155 |
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156 | memset(&g, 0, sizeof(g));
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157 |
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158 | /* parse the args */
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159 | while ((arg = *++argv)) {
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160 | /* take care of -R and -v <version> */
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161 | if (arg[0] == '-'
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162 | && (arg[1] == 'R' || arg[1] == 'v')
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163 | && !arg[2]
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164 | ) {
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165 | if (arg[1] == 'R') {
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166 | g.recursive = 1;
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167 | continue;
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168 | }
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169 | /* arg[1] == 'v' */
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170 | if (!*++argv)
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171 | bb_show_usage();
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172 | g.version = xatoul(*argv);
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173 | g.flags |= OPT_SET_VER;
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174 | continue;
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175 | }
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176 |
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177 | if (!decode_arg(arg, &g))
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178 | break;
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179 | }
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180 |
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181 | /* run sanity checks on all the arguments given us */
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182 | if (!*argv)
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183 | bb_show_usage();
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184 | if ((g.flags & OPT_SET) && (g.flags & (OPT_ADD|OPT_REM)))
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185 | bb_error_msg_and_die("= is incompatible with - and +");
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186 | if (g.rf & g.af)
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187 | bb_error_msg_and_die("can't set and unset a flag");
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188 | if (!g.flags)
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189 | bb_error_msg_and_die("must use '-v', =, - or +");
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190 |
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191 | /* now run chattr on all the files passed to us */
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192 | do change_attributes(*argv, &g); while (*++argv);
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193 |
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194 | return EXIT_SUCCESS;
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195 | }
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