Contents of /tags/mkinitrd-6_1_3/busybox/e2fsprogs/chattr.c
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Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
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Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 4173 byte(s)
tagged 'mkinitrd-6_1_3'
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 "libbb.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 | |
30 | struct globals { |
31 | unsigned long version; |
32 | unsigned long af; |
33 | unsigned long rf; |
34 | smallint flags; |
35 | smallint recursive; |
36 | }; |
37 | |
38 | static unsigned long get_flag(char c) |
39 | { |
40 | const char *fp = strchr(e2attr_flags_sname_chattr, c); |
41 | if (fp) |
42 | return e2attr_flags_value_chattr[fp - e2attr_flags_sname_chattr]; |
43 | bb_show_usage(); |
44 | } |
45 | |
46 | static int decode_arg(const char *arg, struct globals *gp) |
47 | { |
48 | unsigned long *fl; |
49 | char opt = *arg++; |
50 | |
51 | fl = &gp->af; |
52 | if (opt == '-') { |
53 | gp->flags |= OPT_REM; |
54 | fl = &gp->rf; |
55 | } else if (opt == '+') { |
56 | gp->flags |= OPT_ADD; |
57 | } else if (opt == '=') { |
58 | gp->flags |= OPT_SET; |
59 | } else |
60 | return 0; |
61 | |
62 | while (*arg) |
63 | *fl |= get_flag(*arg++); |
64 | |
65 | return 1; |
66 | } |
67 | |
68 | static void change_attributes(const char *name, struct globals *gp); |
69 | |
70 | static int chattr_dir_proc(const char *dir_name, struct dirent *de, void *gp) |
71 | { |
72 | char *path = concat_subpath_file(dir_name, de->d_name); |
73 | /* path is NULL if de->d_name is "." or "..", else... */ |
74 | if (path) { |
75 | change_attributes(path, gp); |
76 | free(path); |
77 | } |
78 | return 0; |
79 | } |
80 | |
81 | static void change_attributes(const char *name, struct globals *gp) |
82 | { |
83 | unsigned long fsflags; |
84 | struct stat st; |
85 | |
86 | if (lstat(name, &st) != 0) { |
87 | bb_perror_msg("stat %s", name); |
88 | return; |
89 | } |
90 | if (S_ISLNK(st.st_mode) && gp->recursive) |
91 | return; |
92 | |
93 | /* Don't try to open device files, fifos etc. We probably |
94 | * ought to display an error if the file was explicitly given |
95 | * on the command line (whether or not recursive was |
96 | * requested). */ |
97 | if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode)) |
98 | return; |
99 | |
100 | if (gp->flags & OPT_SET_VER) |
101 | if (fsetversion(name, gp->version) != 0) |
102 | bb_perror_msg("setting version on %s", name); |
103 | |
104 | if (gp->flags & OPT_SET) { |
105 | fsflags = gp->af; |
106 | } else { |
107 | if (fgetflags(name, &fsflags) != 0) { |
108 | bb_perror_msg("reading flags on %s", name); |
109 | goto skip_setflags; |
110 | } |
111 | /*if (gp->flags & OPT_REM) - not needed, rf is zero otherwise */ |
112 | fsflags &= ~gp->rf; |
113 | /*if (gp->flags & OPT_ADD) - not needed, af is zero otherwise */ |
114 | fsflags |= gp->af; |
115 | /* What is this? And why it's not done for SET case? */ |
116 | if (!S_ISDIR(st.st_mode)) |
117 | fsflags &= ~EXT2_DIRSYNC_FL; |
118 | } |
119 | if (fsetflags(name, fsflags) != 0) |
120 | bb_perror_msg("setting flags on %s", name); |
121 | |
122 | skip_setflags: |
123 | if (gp->recursive && S_ISDIR(st.st_mode)) |
124 | iterate_on_dir(name, chattr_dir_proc, gp); |
125 | } |
126 | |
127 | int chattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
128 | int chattr_main(int argc UNUSED_PARAM, char **argv) |
129 | { |
130 | struct globals g; |
131 | char *arg; |
132 | |
133 | memset(&g, 0, sizeof(g)); |
134 | |
135 | /* parse the args */ |
136 | while ((arg = *++argv)) { |
137 | /* take care of -R and -v <version> */ |
138 | if (arg[0] == '-' |
139 | && (arg[1] == 'R' || arg[1] == 'v') |
140 | && !arg[2] |
141 | ) { |
142 | if (arg[1] == 'R') { |
143 | g.recursive = 1; |
144 | continue; |
145 | } |
146 | /* arg[1] == 'v' */ |
147 | if (!*++argv) |
148 | bb_show_usage(); |
149 | g.version = xatoul(*argv); |
150 | g.flags |= OPT_SET_VER; |
151 | continue; |
152 | } |
153 | |
154 | if (!decode_arg(arg, &g)) |
155 | break; |
156 | } |
157 | |
158 | /* run sanity checks on all the arguments given us */ |
159 | if (!*argv) |
160 | bb_show_usage(); |
161 | if ((g.flags & OPT_SET) && (g.flags & (OPT_ADD|OPT_REM))) |
162 | bb_error_msg_and_die("= is incompatible with - and +"); |
163 | if (g.rf & g.af) |
164 | bb_error_msg_and_die("can't set and unset a flag"); |
165 | if (!g.flags) |
166 | bb_error_msg_and_die("must use '-v', =, - or +"); |
167 | |
168 | /* now run chattr on all the files passed to us */ |
169 | do change_attributes(*argv, &g); while (*++argv); |
170 | |
171 | return EXIT_SUCCESS; |
172 | } |