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 | /* Two separate vectors take less space than vector of structs */
|
---|
41 | static const char flags_letter[] ALIGN1 = "ASDacdijsutT";
|
---|
42 | static const unsigned long flags_val[] = {
|
---|
43 | /* A */ EXT2_NOATIME_FL,
|
---|
44 | /* S */ EXT2_SYNC_FL,
|
---|
45 | /* D */ EXT2_DIRSYNC_FL,
|
---|
46 | /* a */ EXT2_APPEND_FL,
|
---|
47 | /* c */ EXT2_COMPR_FL,
|
---|
48 | /* d */ EXT2_NODUMP_FL,
|
---|
49 | /* i */ EXT2_IMMUTABLE_FL,
|
---|
50 | /* j */ EXT3_JOURNAL_DATA_FL,
|
---|
51 | /* s */ EXT2_SECRM_FL,
|
---|
52 | /* u */ EXT2_UNRM_FL,
|
---|
53 | /* t */ EXT2_NOTAIL_FL,
|
---|
54 | /* T */ EXT2_TOPDIR_FL,
|
---|
55 | };
|
---|
56 | const char *fp;
|
---|
57 |
|
---|
58 | for (fp = flags_letter; *fp; fp++)
|
---|
59 | if (*fp == c)
|
---|
60 | return flags_val[fp - flags_letter];
|
---|
61 | bb_show_usage();
|
---|
62 | }
|
---|
63 |
|
---|
64 | static int decode_arg(const char *arg, struct globals *gp)
|
---|
65 | {
|
---|
66 | unsigned long *fl;
|
---|
67 | char opt = *arg++;
|
---|
68 |
|
---|
69 | fl = &gp->af;
|
---|
70 | if (opt == '-') {
|
---|
71 | gp->flags |= OPT_REM;
|
---|
72 | fl = &gp->rf;
|
---|
73 | } else if (opt == '+') {
|
---|
74 | gp->flags |= OPT_ADD;
|
---|
75 | } else if (opt == '=') {
|
---|
76 | gp->flags |= OPT_SET;
|
---|
77 | } else
|
---|
78 | return 0;
|
---|
79 |
|
---|
80 | while (*arg)
|
---|
81 | *fl |= get_flag(*arg++);
|
---|
82 |
|
---|
83 | return 1;
|
---|
84 | }
|
---|
85 |
|
---|
86 | static void change_attributes(const char *name, struct globals *gp);
|
---|
87 |
|
---|
88 | static int chattr_dir_proc(const char *dir_name, struct dirent *de, void *gp)
|
---|
89 | {
|
---|
90 | char *path = concat_subpath_file(dir_name, de->d_name);
|
---|
91 | /* path is NULL if de->d_name is "." or "..", else... */
|
---|
92 | if (path) {
|
---|
93 | change_attributes(path, gp);
|
---|
94 | free(path);
|
---|
95 | }
|
---|
96 | return 0;
|
---|
97 | }
|
---|
98 |
|
---|
99 | static void change_attributes(const char *name, struct globals *gp)
|
---|
100 | {
|
---|
101 | unsigned long fsflags;
|
---|
102 | struct stat st;
|
---|
103 |
|
---|
104 | if (lstat(name, &st) != 0) {
|
---|
105 | bb_perror_msg("stat %s", name);
|
---|
106 | return;
|
---|
107 | }
|
---|
108 | if (S_ISLNK(st.st_mode) && gp->recursive)
|
---|
109 | return;
|
---|
110 |
|
---|
111 | /* Don't try to open device files, fifos etc. We probably
|
---|
112 | * ought to display an error if the file was explicitly given
|
---|
113 | * on the command line (whether or not recursive was
|
---|
114 | * requested). */
|
---|
115 | if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode))
|
---|
116 | return;
|
---|
117 |
|
---|
118 | if (gp->flags & OPT_SET_VER)
|
---|
119 | if (fsetversion(name, gp->version) != 0)
|
---|
120 | bb_perror_msg("setting version on %s", name);
|
---|
121 |
|
---|
122 | if (gp->flags & OPT_SET) {
|
---|
123 | fsflags = gp->af;
|
---|
124 | } else {
|
---|
125 | if (fgetflags(name, &fsflags) != 0) {
|
---|
126 | bb_perror_msg("reading flags on %s", name);
|
---|
127 | goto skip_setflags;
|
---|
128 | }
|
---|
129 | /*if (gp->flags & OPT_REM) - not needed, rf is zero otherwise */
|
---|
130 | fsflags &= ~gp->rf;
|
---|
131 | /*if (gp->flags & OPT_ADD) - not needed, af is zero otherwise */
|
---|
132 | fsflags |= gp->af;
|
---|
133 | /* What is this? And why it's not done for SET case? */
|
---|
134 | if (!S_ISDIR(st.st_mode))
|
---|
135 | fsflags &= ~EXT2_DIRSYNC_FL;
|
---|
136 | }
|
---|
137 | if (fsetflags(name, fsflags) != 0)
|
---|
138 | bb_perror_msg("setting flags on %s", name);
|
---|
139 |
|
---|
140 | skip_setflags:
|
---|
141 | if (gp->recursive && S_ISDIR(st.st_mode))
|
---|
142 | iterate_on_dir(name, chattr_dir_proc, gp);
|
---|
143 | }
|
---|
144 |
|
---|
145 | int chattr_main(int argc, char **argv);
|
---|
146 | int chattr_main(int argc, char **argv)
|
---|
147 | {
|
---|
148 | struct globals g;
|
---|
149 | char *arg;
|
---|
150 |
|
---|
151 | memset(&g, 0, sizeof(g));
|
---|
152 |
|
---|
153 | /* parse the args */
|
---|
154 | while ((arg = *++argv)) {
|
---|
155 | /* take care of -R and -v <version> */
|
---|
156 | if (arg[0] == '-'
|
---|
157 | && (arg[1] == 'R' || arg[1] == 'v')
|
---|
158 | && !arg[2]
|
---|
159 | ) {
|
---|
160 | if (arg[1] == 'R') {
|
---|
161 | g.recursive = 1;
|
---|
162 | continue;
|
---|
163 | }
|
---|
164 | /* arg[1] == 'v' */
|
---|
165 | if (!*++argv)
|
---|
166 | bb_show_usage();
|
---|
167 | g.version = xatoul(*argv);
|
---|
168 | g.flags |= OPT_SET_VER;
|
---|
169 | continue;
|
---|
170 | }
|
---|
171 |
|
---|
172 | if (!decode_arg(arg, &g))
|
---|
173 | break;
|
---|
174 | }
|
---|
175 |
|
---|
176 | /* run sanity checks on all the arguments given us */
|
---|
177 | if (!*argv)
|
---|
178 | bb_show_usage();
|
---|
179 | if ((g.flags & OPT_SET) && (g.flags & (OPT_ADD|OPT_REM)))
|
---|
180 | bb_error_msg_and_die("= is incompatible with - and +");
|
---|
181 | if (g.rf & g.af)
|
---|
182 | bb_error_msg_and_die("can't set and unset a flag");
|
---|
183 | if (!g.flags)
|
---|
184 | bb_error_msg_and_die("must use '-v', =, - or +");
|
---|
185 |
|
---|
186 | /* now run chattr on all the files passed to us */
|
---|
187 | do change_attributes(*argv, &g); while (*++argv);
|
---|
188 |
|
---|
189 | return EXIT_SUCCESS;
|
---|
190 | }
|
---|