[1765] | 1 | /* vi: set sw=4 ts=4: */
|
---|
[821] | 2 | /*
|
---|
| 3 | * chattr.c - Change file attributes on an ext2 file system
|
---|
| 4 | *
|
---|
| 5 | * Copyright (C) 1993, 1994 Remy Card <card@masi.ibp.fr>
|
---|
| 6 | * Laboratoire MASI, Institut Blaise Pascal
|
---|
| 7 | * Universite Pierre et Marie Curie (Paris VI)
|
---|
| 8 | *
|
---|
| 9 | * This file can be redistributed under the terms of the GNU General
|
---|
| 10 | * Public License
|
---|
| 11 | */
|
---|
| 12 |
|
---|
| 13 | /*
|
---|
| 14 | * History:
|
---|
| 15 | * 93/10/30 - Creation
|
---|
| 16 | * 93/11/13 - Replace stat() calls by lstat() to avoid loops
|
---|
| 17 | * 94/02/27 - Integrated in Ted's distribution
|
---|
| 18 | * 98/12/29 - Ignore symlinks when working recursively (G M Sipe)
|
---|
| 19 | * 98/12/29 - Display version info only when -V specified (G M Sipe)
|
---|
| 20 | */
|
---|
| 21 |
|
---|
[1765] | 22 | #include "libbb.h"
|
---|
| 23 | #include "e2fs_lib.h"
|
---|
[821] | 24 |
|
---|
| 25 | #define OPT_ADD 1
|
---|
| 26 | #define OPT_REM 2
|
---|
| 27 | #define OPT_SET 4
|
---|
| 28 | #define OPT_SET_VER 8
|
---|
| 29 |
|
---|
[1765] | 30 | struct globals {
|
---|
| 31 | unsigned long version;
|
---|
| 32 | unsigned long af;
|
---|
| 33 | unsigned long rf;
|
---|
| 34 | smallint flags;
|
---|
| 35 | smallint recursive;
|
---|
[821] | 36 | };
|
---|
| 37 |
|
---|
| 38 | static unsigned long get_flag(char c)
|
---|
| 39 | {
|
---|
[1765] | 40 | /* Two separate vectors take less space than vector of structs */
|
---|
| 41 | static const char flags_letter[] ALIGN1 = "ASDacdijsutT";
|
---|
| 42 | static const unsigned long flags_val[] = {
|
---|
| 43 | /* A */ EXT2_NOATIME_FL,
|
---|
| 44 | /* S */ EXT2_SYNC_FL,
|
---|
| 45 | /* D */ EXT2_DIRSYNC_FL,
|
---|
| 46 | /* a */ EXT2_APPEND_FL,
|
---|
| 47 | /* c */ EXT2_COMPR_FL,
|
---|
| 48 | /* d */ EXT2_NODUMP_FL,
|
---|
| 49 | /* i */ EXT2_IMMUTABLE_FL,
|
---|
| 50 | /* j */ EXT3_JOURNAL_DATA_FL,
|
---|
| 51 | /* s */ EXT2_SECRM_FL,
|
---|
| 52 | /* u */ EXT2_UNRM_FL,
|
---|
| 53 | /* t */ EXT2_NOTAIL_FL,
|
---|
| 54 | /* T */ EXT2_TOPDIR_FL,
|
---|
| 55 | };
|
---|
| 56 | const char *fp;
|
---|
| 57 |
|
---|
| 58 | for (fp = flags_letter; *fp; fp++)
|
---|
| 59 | if (*fp == c)
|
---|
| 60 | return flags_val[fp - flags_letter];
|
---|
[821] | 61 | bb_show_usage();
|
---|
| 62 | }
|
---|
| 63 |
|
---|
[1765] | 64 | static int decode_arg(const char *arg, struct globals *gp)
|
---|
[821] | 65 | {
|
---|
| 66 | unsigned long *fl;
|
---|
| 67 | char opt = *arg++;
|
---|
| 68 |
|
---|
[1765] | 69 | fl = &gp->af;
|
---|
[821] | 70 | if (opt == '-') {
|
---|
[1765] | 71 | gp->flags |= OPT_REM;
|
---|
| 72 | fl = &gp->rf;
|
---|
[821] | 73 | } else if (opt == '+') {
|
---|
[1765] | 74 | gp->flags |= OPT_ADD;
|
---|
[821] | 75 | } else if (opt == '=') {
|
---|
[1765] | 76 | gp->flags |= OPT_SET;
|
---|
[821] | 77 | } else
|
---|
[1765] | 78 | return 0;
|
---|
[821] | 79 |
|
---|
[1765] | 80 | while (*arg)
|
---|
| 81 | *fl |= get_flag(*arg++);
|
---|
[821] | 82 |
|
---|
| 83 | return 1;
|
---|
| 84 | }
|
---|
| 85 |
|
---|
[1765] | 86 | static void change_attributes(const char *name, struct globals *gp);
|
---|
[821] | 87 |
|
---|
[1765] | 88 | static int chattr_dir_proc(const char *dir_name, struct dirent *de, void *gp)
|
---|
[821] | 89 | {
|
---|
[1765] | 90 | char *path = concat_subpath_file(dir_name, de->d_name);
|
---|
| 91 | /* path is NULL if de->d_name is "." or "..", else... */
|
---|
| 92 | if (path) {
|
---|
| 93 | change_attributes(path, gp);
|
---|
| 94 | free(path);
|
---|
| 95 | }
|
---|
| 96 | return 0;
|
---|
| 97 | }
|
---|
| 98 |
|
---|
| 99 | static void change_attributes(const char *name, struct globals *gp)
|
---|
| 100 | {
|
---|
[821] | 101 | unsigned long fsflags;
|
---|
[1765] | 102 | struct stat st;
|
---|
[821] | 103 |
|
---|
[1765] | 104 | if (lstat(name, &st) != 0) {
|
---|
| 105 | bb_perror_msg("stat %s", name);
|
---|
[821] | 106 | return;
|
---|
| 107 | }
|
---|
[1765] | 108 | if (S_ISLNK(st.st_mode) && gp->recursive)
|
---|
[821] | 109 | return;
|
---|
| 110 |
|
---|
| 111 | /* Don't try to open device files, fifos etc. We probably
|
---|
| 112 | * ought to display an error if the file was explicitly given
|
---|
| 113 | * on the command line (whether or not recursive was
|
---|
| 114 | * requested). */
|
---|
| 115 | if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode))
|
---|
| 116 | return;
|
---|
| 117 |
|
---|
[1765] | 118 | if (gp->flags & OPT_SET_VER)
|
---|
| 119 | if (fsetversion(name, gp->version) != 0)
|
---|
| 120 | bb_perror_msg("setting version on %s", name);
|
---|
[821] | 121 |
|
---|
[1765] | 122 | if (gp->flags & OPT_SET) {
|
---|
| 123 | fsflags = gp->af;
|
---|
[821] | 124 | } else {
|
---|
[1765] | 125 | if (fgetflags(name, &fsflags) != 0) {
|
---|
| 126 | bb_perror_msg("reading flags on %s", name);
|
---|
[821] | 127 | goto skip_setflags;
|
---|
| 128 | }
|
---|
[1765] | 129 | /*if (gp->flags & OPT_REM) - not needed, rf is zero otherwise */
|
---|
| 130 | fsflags &= ~gp->rf;
|
---|
| 131 | /*if (gp->flags & OPT_ADD) - not needed, af is zero otherwise */
|
---|
| 132 | fsflags |= gp->af;
|
---|
| 133 | /* What is this? And why it's not done for SET case? */
|
---|
[821] | 134 | if (!S_ISDIR(st.st_mode))
|
---|
| 135 | fsflags &= ~EXT2_DIRSYNC_FL;
|
---|
| 136 | }
|
---|
[1765] | 137 | if (fsetflags(name, fsflags) != 0)
|
---|
| 138 | bb_perror_msg("setting flags on %s", name);
|
---|
[821] | 139 |
|
---|
[1765] | 140 | skip_setflags:
|
---|
| 141 | if (gp->recursive && S_ISDIR(st.st_mode))
|
---|
| 142 | iterate_on_dir(name, chattr_dir_proc, gp);
|
---|
[821] | 143 | }
|
---|
| 144 |
|
---|
[1765] | 145 | int chattr_main(int argc, char **argv);
|
---|
[821] | 146 | int chattr_main(int argc, char **argv)
|
---|
| 147 | {
|
---|
[1765] | 148 | struct globals g;
|
---|
[821] | 149 | char *arg;
|
---|
| 150 |
|
---|
[1765] | 151 | memset(&g, 0, sizeof(g));
|
---|
| 152 |
|
---|
[821] | 153 | /* parse the args */
|
---|
[1765] | 154 | while ((arg = *++argv)) {
|
---|
[821] | 155 | /* take care of -R and -v <version> */
|
---|
[1765] | 156 | if (arg[0] == '-'
|
---|
| 157 | && (arg[1] == 'R' || arg[1] == 'v')
|
---|
| 158 | && !arg[2]
|
---|
| 159 | ) {
|
---|
| 160 | if (arg[1] == 'R') {
|
---|
| 161 | g.recursive = 1;
|
---|
[821] | 162 | continue;
|
---|
| 163 | }
|
---|
[1765] | 164 | /* arg[1] == 'v' */
|
---|
| 165 | if (!*++argv)
|
---|
| 166 | bb_show_usage();
|
---|
| 167 | g.version = xatoul(*argv);
|
---|
| 168 | g.flags |= OPT_SET_VER;
|
---|
| 169 | continue;
|
---|
[821] | 170 | }
|
---|
| 171 |
|
---|
[1765] | 172 | if (!decode_arg(arg, &g))
|
---|
[821] | 173 | break;
|
---|
| 174 | }
|
---|
| 175 |
|
---|
| 176 | /* run sanity checks on all the arguments given us */
|
---|
[1765] | 177 | if (!*argv)
|
---|
[821] | 178 | bb_show_usage();
|
---|
[1765] | 179 | if ((g.flags & OPT_SET) && (g.flags & (OPT_ADD|OPT_REM)))
|
---|
[821] | 180 | bb_error_msg_and_die("= is incompatible with - and +");
|
---|
[1765] | 181 | if (g.rf & g.af)
|
---|
| 182 | bb_error_msg_and_die("can't set and unset a flag");
|
---|
| 183 | if (!g.flags)
|
---|
| 184 | bb_error_msg_and_die("must use '-v', =, - or +");
|
---|
[821] | 185 |
|
---|
| 186 | /* now run chattr on all the files passed to us */
|
---|
[1765] | 187 | do change_attributes(*argv, &g); while (*++argv);
|
---|
[821] | 188 |
|
---|
| 189 | return EXIT_SUCCESS;
|
---|
| 190 | }
|
---|