blob: 043f39591457407c12e1074185c4a066678e7029
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 | //config:config CHATTR |
13 | //config: bool "chattr" |
14 | //config: default y |
15 | //config: help |
16 | //config: chattr changes the file attributes on a second extended file system. |
17 | |
18 | //applet:IF_CHATTR(APPLET(chattr, BB_DIR_BIN, BB_SUID_DROP)) |
19 | |
20 | //kbuild:lib-$(CONFIG_CHATTR) += chattr.o e2fs_lib.o |
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 ext2 file attributes\n" |
26 | //usage: "\nModifiers:" |
27 | //usage: "\n -,+,= Remove/add/set attributes" |
28 | //usage: "\nAttributes:" |
29 | //usage: "\n A Don't track atime" |
30 | //usage: "\n a Append mode only" |
31 | //usage: "\n c Enable compress" |
32 | //usage: "\n D Write dir contents synchronously" |
33 | //usage: "\n d Don't backup with dump" |
34 | //usage: "\n i Cannot be modified (immutable)" |
35 | //usage: "\n j Write all data to journal first" |
36 | //usage: "\n s Zero disk storage when deleted" |
37 | //usage: "\n S Write synchronously" |
38 | //usage: "\n t Disable tail-merging of partial blocks with other files" |
39 | //usage: "\n u Allow file to be undeleted" |
40 | //usage: "\n -R Recurse" |
41 | //usage: "\n -v VER Set version/generation number" |
42 | |
43 | #include "libbb.h" |
44 | #include "e2fs_lib.h" |
45 | |
46 | #define OPT_ADD 1 |
47 | #define OPT_REM 2 |
48 | #define OPT_SET 4 |
49 | #define OPT_SET_VER 8 |
50 | |
51 | struct globals { |
52 | unsigned long version; |
53 | unsigned long af; |
54 | unsigned long rf; |
55 | smallint flags; |
56 | smallint recursive; |
57 | }; |
58 | |
59 | static unsigned long get_flag(char c) |
60 | { |
61 | const char *fp = strchr(e2attr_flags_sname_chattr, c); |
62 | if (fp) |
63 | return e2attr_flags_value_chattr[fp - e2attr_flags_sname_chattr]; |
64 | bb_show_usage(); |
65 | } |
66 | |
67 | static int decode_arg(const char *arg, struct globals *gp) |
68 | { |
69 | unsigned long *fl; |
70 | char opt = *arg++; |
71 | |
72 | fl = &gp->af; |
73 | if (opt == '-') { |
74 | gp->flags |= OPT_REM; |
75 | fl = &gp->rf; |
76 | } else if (opt == '+') { |
77 | gp->flags |= OPT_ADD; |
78 | } else if (opt == '=') { |
79 | gp->flags |= OPT_SET; |
80 | } else |
81 | return 0; |
82 | |
83 | while (*arg) |
84 | *fl |= get_flag(*arg++); |
85 | |
86 | return 1; |
87 | } |
88 | |
89 | static void change_attributes(const char *name, struct globals *gp); |
90 | |
91 | static int FAST_FUNC chattr_dir_proc(const char *dir_name, struct dirent *de, void *gp) |
92 | { |
93 | char *path = concat_subpath_file(dir_name, de->d_name); |
94 | /* path is NULL if de->d_name is "." or "..", else... */ |
95 | if (path) { |
96 | change_attributes(path, gp); |
97 | free(path); |
98 | } |
99 | return 0; |
100 | } |
101 | |
102 | static void change_attributes(const char *name, struct globals *gp) |
103 | { |
104 | unsigned long fsflags; |
105 | struct stat st; |
106 | |
107 | if (lstat(name, &st) != 0) { |
108 | bb_perror_msg("stat %s", name); |
109 | return; |
110 | } |
111 | if (S_ISLNK(st.st_mode) && gp->recursive) |
112 | return; |
113 | |
114 | /* Don't try to open device files, fifos etc. We probably |
115 | * ought to display an error if the file was explicitly given |
116 | * on the command line (whether or not recursive was |
117 | * requested). */ |
118 | if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode)) |
119 | return; |
120 | |
121 | if (gp->flags & OPT_SET_VER) |
122 | if (fsetversion(name, gp->version) != 0) |
123 | bb_perror_msg("setting version on %s", name); |
124 | |
125 | if (gp->flags & OPT_SET) { |
126 | fsflags = gp->af; |
127 | } else { |
128 | if (fgetflags(name, &fsflags) != 0) { |
129 | bb_perror_msg("reading flags on %s", name); |
130 | goto skip_setflags; |
131 | } |
132 | /*if (gp->flags & OPT_REM) - not needed, rf is zero otherwise */ |
133 | fsflags &= ~gp->rf; |
134 | /*if (gp->flags & OPT_ADD) - not needed, af is zero otherwise */ |
135 | fsflags |= gp->af; |
136 | /* What is this? And why it's not done for SET case? */ |
137 | if (!S_ISDIR(st.st_mode)) |
138 | fsflags &= ~EXT2_DIRSYNC_FL; |
139 | } |
140 | if (fsetflags(name, fsflags) != 0) |
141 | bb_perror_msg("setting flags on %s", name); |
142 | |
143 | skip_setflags: |
144 | if (gp->recursive && S_ISDIR(st.st_mode)) |
145 | iterate_on_dir(name, chattr_dir_proc, gp); |
146 | } |
147 | |
148 | int chattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
149 | int chattr_main(int argc UNUSED_PARAM, char **argv) |
150 | { |
151 | struct globals g; |
152 | char *arg; |
153 | |
154 | memset(&g, 0, sizeof(g)); |
155 | |
156 | /* parse the args */ |
157 | while ((arg = *++argv)) { |
158 | /* take care of -R and -v <version> */ |
159 | if (arg[0] == '-' |
160 | && (arg[1] == 'R' || arg[1] == 'v') |
161 | && !arg[2] |
162 | ) { |
163 | if (arg[1] == 'R') { |
164 | g.recursive = 1; |
165 | continue; |
166 | } |
167 | /* arg[1] == 'v' */ |
168 | if (!*++argv) |
169 | bb_show_usage(); |
170 | g.version = xatoul(*argv); |
171 | g.flags |= OPT_SET_VER; |
172 | continue; |
173 | } |
174 | |
175 | if (!decode_arg(arg, &g)) |
176 | break; |
177 | } |
178 | |
179 | /* run sanity checks on all the arguments given us */ |
180 | if (!*argv) |
181 | bb_show_usage(); |
182 | if ((g.flags & OPT_SET) && (g.flags & (OPT_ADD|OPT_REM))) |
183 | bb_error_msg_and_die("= is incompatible with - and +"); |
184 | if (g.rf & g.af) |
185 | bb_error_msg_and_die("can't set and unset a flag"); |
186 | if (!g.flags) |
187 | bb_error_msg_and_die("must use '-v', =, - or +"); |
188 | |
189 | /* now run chattr on all the files passed to us */ |
190 | do change_attributes(*argv, &g); while (*++argv); |
191 | |
192 | return EXIT_SUCCESS; |
193 | } |
194 |