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 | }
|
---|