blob: f1cc8389fb3ba90ccb67906a1bdeecde886e9395
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 | //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" |
44 | |
45 | #include "libbb.h" |
46 | #include "e2fs_lib.h" |
47 | |
48 | #define OPT_ADD 1 |
49 | #define OPT_REM 2 |
50 | #define OPT_SET 4 |
51 | #define OPT_SET_VER 8 |
52 | |
53 | struct globals { |
54 | unsigned long version; |
55 | unsigned long af; |
56 | unsigned long rf; |
57 | smallint flags; |
58 | smallint recursive; |
59 | }; |
60 | |
61 | static unsigned long get_flag(char c) |
62 | { |
63 | const char *fp = strchr(e2attr_flags_sname_chattr, c); |
64 | if (fp) |
65 | return e2attr_flags_value_chattr[fp - e2attr_flags_sname_chattr]; |
66 | bb_show_usage(); |
67 | } |
68 | |
69 | static int decode_arg(const char *arg, struct globals *gp) |
70 | { |
71 | unsigned long *fl; |
72 | char opt = *arg++; |
73 | |
74 | fl = &gp->af; |
75 | if (opt == '-') { |
76 | gp->flags |= OPT_REM; |
77 | fl = &gp->rf; |
78 | } else if (opt == '+') { |
79 | gp->flags |= OPT_ADD; |
80 | } else if (opt == '=') { |
81 | gp->flags |= OPT_SET; |
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, struct globals *gp); |
92 | |
93 | static int FAST_FUNC chattr_dir_proc(const char *dir_name, struct dirent *de, void *gp) |
94 | { |
95 | char *path = concat_subpath_file(dir_name, de->d_name); |
96 | /* path is NULL if de->d_name is "." or "..", else... */ |
97 | if (path) { |
98 | change_attributes(path, gp); |
99 | free(path); |
100 | } |
101 | return 0; |
102 | } |
103 | |
104 | static void change_attributes(const char *name, struct globals *gp) |
105 | { |
106 | unsigned long fsflags; |
107 | struct stat st; |
108 | |
109 | if (lstat(name, &st) != 0) { |
110 | bb_perror_msg("stat %s", name); |
111 | return; |
112 | } |
113 | if (S_ISLNK(st.st_mode) && gp->recursive) |
114 | return; |
115 | |
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 |
119 | * requested). */ |
120 | if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode)) |
121 | return; |
122 | |
123 | if (gp->flags & OPT_SET_VER) |
124 | if (fsetversion(name, gp->version) != 0) |
125 | bb_perror_msg("setting version on %s", name); |
126 | |
127 | if (gp->flags & OPT_SET) { |
128 | fsflags = gp->af; |
129 | } else { |
130 | if (fgetflags(name, &fsflags) != 0) { |
131 | bb_perror_msg("reading flags on %s", name); |
132 | goto skip_setflags; |
133 | } |
134 | /*if (gp->flags & OPT_REM) - not needed, rf is zero otherwise */ |
135 | fsflags &= ~gp->rf; |
136 | /*if (gp->flags & OPT_ADD) - not needed, af is zero otherwise */ |
137 | fsflags |= gp->af; |
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; |
141 | } |
142 | if (fsetflags(name, fsflags) != 0) |
143 | bb_perror_msg("setting flags on %s", name); |
144 | |
145 | skip_setflags: |
146 | if (gp->recursive && S_ISDIR(st.st_mode)) |
147 | iterate_on_dir(name, chattr_dir_proc, gp); |
148 | } |
149 | |
150 | int chattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
151 | int chattr_main(int argc UNUSED_PARAM, char **argv) |
152 | { |
153 | struct globals g; |
154 | char *arg; |
155 | |
156 | memset(&g, 0, sizeof(g)); |
157 | |
158 | /* parse the args */ |
159 | while ((arg = *++argv)) { |
160 | /* take care of -R and -v <version> */ |
161 | if (arg[0] == '-' |
162 | && (arg[1] == 'R' || arg[1] == 'v') |
163 | && !arg[2] |
164 | ) { |
165 | if (arg[1] == 'R') { |
166 | g.recursive = 1; |
167 | continue; |
168 | } |
169 | /* arg[1] == 'v' */ |
170 | if (!*++argv) |
171 | bb_show_usage(); |
172 | g.version = xatoul(*argv); |
173 | g.flags |= OPT_SET_VER; |
174 | continue; |
175 | } |
176 | |
177 | if (!decode_arg(arg, &g)) |
178 | break; |
179 | } |
180 | |
181 | /* run sanity checks on all the arguments given us */ |
182 | if (!*argv) |
183 | bb_show_usage(); |
184 | if ((g.flags & OPT_SET) && (g.flags & (OPT_ADD|OPT_REM))) |
185 | bb_error_msg_and_die("= is incompatible with - and +"); |
186 | if (g.rf & g.af) |
187 | bb_error_msg_and_die("can't set and unset a flag"); |
188 | if (!g.flags) |
189 | bb_error_msg_and_die("must use '-v', =, - or +"); |
190 | |
191 | /* now run chattr on all the files passed to us */ |
192 | do change_attributes(*argv, &g); while (*++argv); |
193 | |
194 | return EXIT_SUCCESS; |
195 | } |
196 |