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    Contents of /trunk/mkinitrd-magellan/busybox/e2fsprogs/chattr.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
    File MIME type: text/plain
    File size: 4317 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 /* vi: set sw=4 ts=4: */
    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
    22 #include "busybox.h"
    23 #include "e2fs_lib.h"
    24
    25 #define OPT_ADD 1
    26 #define OPT_REM 2
    27 #define OPT_SET 4
    28 #define OPT_SET_VER 8
    29 static int flags;
    30 static int recursive;
    31
    32 static unsigned long version;
    33
    34 static unsigned long af;
    35 static unsigned long rf;
    36 static unsigned long sf;
    37
    38 struct flags_char {
    39 unsigned long flag;
    40 char optchar;
    41 };
    42
    43 static const struct flags_char flags_array[] = {
    44 { EXT2_NOATIME_FL, 'A' },
    45 { EXT2_SYNC_FL, 'S' },
    46 { EXT2_DIRSYNC_FL, 'D' },
    47 { EXT2_APPEND_FL, 'a' },
    48 { EXT2_COMPR_FL, 'c' },
    49 { EXT2_NODUMP_FL, 'd' },
    50 { EXT2_IMMUTABLE_FL, 'i' },
    51 { EXT3_JOURNAL_DATA_FL, 'j' },
    52 { EXT2_SECRM_FL, 's' },
    53 { EXT2_UNRM_FL, 'u' },
    54 { EXT2_NOTAIL_FL, 't' },
    55 { EXT2_TOPDIR_FL, 'T' },
    56 { 0, 0 }
    57 };
    58
    59 static unsigned long get_flag(char c)
    60 {
    61 const struct flags_char *fp;
    62 for (fp = flags_array; fp->optchar; fp++)
    63 if (fp->optchar == c)
    64 return fp->flag;
    65 bb_show_usage();
    66 }
    67
    68 static int decode_arg(const char *arg)
    69 {
    70 unsigned long *fl;
    71 char opt = *arg++;
    72
    73 if (opt == '-') {
    74 flags |= OPT_REM;
    75 fl = &rf;
    76 } else if (opt == '+') {
    77 flags |= OPT_ADD;
    78 fl = &af;
    79 } else if (opt == '=') {
    80 flags |= OPT_SET;
    81 fl = &sf;
    82 } else
    83 return 0;
    84
    85 while (*arg)
    86 *fl |= get_flag(*arg++);
    87
    88 return 1;
    89 }
    90
    91 static void change_attributes(const char *name);
    92
    93 static int chattr_dir_proc(const char *dir_name, struct dirent *de,
    94 void *private ATTRIBUTE_UNUSED)
    95 {
    96 char *path = concat_subpath_file(dir_name, de->d_name);
    97 /* path is NULL if de->d_name is "." or "..", else... */
    98 if (path) {
    99 change_attributes(path);
    100 free(path);
    101 }
    102 return 0;
    103 }
    104
    105 static void change_attributes(const char *name)
    106 {
    107 unsigned long fsflags;
    108 struct stat st;
    109
    110 if (lstat(name, &st) == -1) {
    111 bb_perror_msg("stat %s", name);
    112 return;
    113 }
    114 if (S_ISLNK(st.st_mode) && recursive)
    115 return;
    116
    117 /* Don't try to open device files, fifos etc. We probably
    118 * ought to display an error if the file was explicitly given
    119 * on the command line (whether or not recursive was
    120 * requested). */
    121 if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode))
    122 return;
    123
    124 if (flags & OPT_SET_VER)
    125 if (fsetversion(name, version) == -1)
    126 bb_perror_msg("setting version on %s", name);
    127
    128 if (flags & OPT_SET) {
    129 fsflags = sf;
    130 } else {
    131 if (fgetflags(name, &fsflags) == -1) {
    132 bb_perror_msg("reading flags on %s", name);
    133 goto skip_setflags;
    134 }
    135 if (flags & OPT_REM)
    136 fsflags &= ~rf;
    137 if (flags & OPT_ADD)
    138 fsflags |= af;
    139 if (!S_ISDIR(st.st_mode))
    140 fsflags &= ~EXT2_DIRSYNC_FL;
    141 }
    142 if (fsetflags(name, fsflags) == -1)
    143 bb_perror_msg("setting flags on %s", name);
    144
    145 skip_setflags:
    146 if (recursive && S_ISDIR(st.st_mode))
    147 iterate_on_dir(name, chattr_dir_proc, NULL);
    148 }
    149
    150 int chattr_main(int argc, char **argv)
    151 {
    152 char *arg;
    153
    154 /* parse the args */
    155 while ((arg = *++argv)) {
    156 /* take care of -R and -v <version> */
    157 if (arg[0] == '-') {
    158 if (arg[1] == 'R' && arg[2] == '\0') {
    159 recursive = 1;
    160 continue;
    161 }
    162 if (arg[1] == 'v' && arg[2] == '\0') {
    163 if (!*++argv)
    164 bb_show_usage();
    165 version = xatoul(*argv);
    166 flags |= OPT_SET_VER;
    167 continue;
    168 }
    169 }
    170
    171 if (!decode_arg(arg))
    172 break;
    173 }
    174
    175 /* run sanity checks on all the arguments given us */
    176 if (!*argv)
    177 bb_show_usage();
    178 if ((flags & OPT_SET) && (flags & (OPT_ADD|OPT_REM)))
    179 bb_error_msg_and_die("= is incompatible with - and +");
    180 if (rf & af)
    181 bb_error_msg_and_die("can't set and unset a flag");
    182 if (!flags)
    183 bb_error_msg_and_die("must use '-v', =, - or +");
    184
    185 /* now run chattr on all the files passed to us */
    186 do change_attributes(*argv); while (*++argv);
    187
    188 return EXIT_SUCCESS;
    189 }