1 /* vi: set sw=4 ts=4: */
3 * chattr.c - Change file attributes on an ext2 file system
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)
9 * This file can be redistributed under the terms of the GNU General
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)
22 //usage:#define chattr_trivial_usage
23 //usage: "[-R] [-+=AacDdijsStTu] [-v VERSION] [FILE]..."
24 //usage:#define chattr_full_usage "\n\n"
25 //usage: "Change file attributes on an ext2 fs\n"
26 //usage: "\nModifiers:"
27 //usage: "\n - Remove attributes"
28 //usage: "\n + Add attributes"
29 //usage: "\n = Set attributes"
30 //usage: "\nAttributes:"
31 //usage: "\n A Don't track atime"
32 //usage: "\n a Append mode only"
33 //usage: "\n c Enable compress"
34 //usage: "\n D Write dir contents synchronously"
35 //usage: "\n d Don't backup with dump"
36 //usage: "\n i Cannot be modified (immutable)"
37 //usage: "\n j Write all data to journal first"
38 //usage: "\n s Zero disk storage when deleted"
39 //usage: "\n S Write file contents synchronously"
40 //usage: "\n t Disable tail-merging of partial blocks with other files"
41 //usage: "\n u Allow file to be undeleted"
42 //usage: "\n -R Recurse"
43 //usage: "\n -v Set the file's version/generation number"
54 unsigned long version;
61 static unsigned long get_flag(char c)
63 const char *fp = strchr(e2attr_flags_sname_chattr, c);
65 return e2attr_flags_value_chattr[fp - e2attr_flags_sname_chattr];
69 static int decode_arg(const char *arg, struct globals *gp)
78 } else if (opt == '+') {
80 } else if (opt == '=') {
86 *fl |= get_flag(*arg++);
91 static void change_attributes(const char *name, struct globals *gp);
93 static int FAST_FUNC chattr_dir_proc(const char *dir_name, struct dirent *de, void *gp)
95 char *path = concat_subpath_file(dir_name, de->d_name);
96 /* path is NULL if de->d_name is "." or "..", else... */
98 change_attributes(path, gp);
104 static void change_attributes(const char *name, struct globals *gp)
106 unsigned long fsflags;
109 if (lstat(name, &st) != 0) {
110 bb_perror_msg("stat %s", name);
113 if (S_ISLNK(st.st_mode) && gp->recursive)
116 /* Don't try to open device files, fifos etc. We probably
117 * ought to display an error if the file was explicitly given
118 * on the command line (whether or not recursive was
120 if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode))
123 if (gp->flags & OPT_SET_VER)
124 if (fsetversion(name, gp->version) != 0)
125 bb_perror_msg("setting version on %s", name);
127 if (gp->flags & OPT_SET) {
130 if (fgetflags(name, &fsflags) != 0) {
131 bb_perror_msg("reading flags on %s", name);
134 /*if (gp->flags & OPT_REM) - not needed, rf is zero otherwise */
136 /*if (gp->flags & OPT_ADD) - not needed, af is zero otherwise */
138 /* What is this? And why it's not done for SET case? */
139 if (!S_ISDIR(st.st_mode))
140 fsflags &= ~EXT2_DIRSYNC_FL;
142 if (fsetflags(name, fsflags) != 0)
143 bb_perror_msg("setting flags on %s", name);
146 if (gp->recursive && S_ISDIR(st.st_mode))
147 iterate_on_dir(name, chattr_dir_proc, gp);
150 int chattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
151 int chattr_main(int argc UNUSED_PARAM, char **argv)
156 memset(&g, 0, sizeof(g));
159 while ((arg = *++argv)) {
160 /* take care of -R and -v <version> */
162 && (arg[1] == 'R' || arg[1] == 'v')
172 g.version = xatoul(*argv);
173 g.flags |= OPT_SET_VER;
177 if (!decode_arg(arg, &g))
181 /* run sanity checks on all the arguments given us */
184 if ((g.flags & OPT_SET) && (g.flags & (OPT_ADD|OPT_REM)))
185 bb_error_msg_and_die("= is incompatible with - and +");
187 bb_error_msg_and_die("can't set and unset a flag");
189 bb_error_msg_and_die("must use '-v', =, - or +");
191 /* now run chattr on all the files passed to us */
192 do change_attributes(*argv, &g); while (*++argv);