1 /* getfattr.c - Read POSIX extended attributes.
2 *
3 * Copyright 2016 Android Open Source Project.
4 *
5 * No standard
6
7 USE_GETFATTR(NEWTOY(getfattr, "(only-values)dhn:", TOYFLAG_USR|TOYFLAG_BIN))
8
9 config GETFATTR
10 bool "getfattr"
11 default n
12 help
13 usage: getfattr [-d] [-h] [-n NAME] FILE...
14
15 Read POSIX extended attributes.
16
17 -d Show values as well as names
18 -h Do not dereference symbolic links
19 -n Show only attributes with the given name
20 --only-values Don't show names
21 */
22
23 #define FOR_getfattr
24 #include "toys.h"
25
GLOBALS(char * n;)26 GLOBALS(
27 char *n;
28 )
29
30 // TODO: factor out the lister and getter loops and use them in cp too.
31 static void do_getfattr(char *file)
32 {
33 ssize_t (*getter)(const char *, const char *, void *, size_t) = getxattr;
34 ssize_t (*lister)(const char *, char *, size_t) = listxattr;
35 char **sorted_keys;
36 ssize_t keys_len;
37 char *keys, *key;
38 int i, key_count;
39
40 if (FLAG(h)) {
41 getter = lgetxattr;
42 lister = llistxattr;
43 }
44
45 // Collect the keys.
46 while ((keys_len = lister(file, NULL, 0))) {
47 if (keys_len == -1) perror_msg("listxattr failed");
48 keys = xmalloc(keys_len);
49 if (lister(file, keys, keys_len) == keys_len) break;
50 free(keys);
51 }
52
53 if (keys_len == 0) return;
54
55 // Sort the keys.
56 for (key = keys, key_count = 0; key-keys < keys_len; key += strlen(key)+1)
57 key_count++;
58 sorted_keys = xmalloc(key_count * sizeof(char *));
59 for (key = keys, i = 0; key-keys < keys_len; key += strlen(key)+1)
60 sorted_keys[i++] = key;
61 qsort(sorted_keys, key_count, sizeof(char *), qstrcmp);
62
63 if (!FLAG(only_values)) printf("# file: %s\n", file);
64
65 for (i = 0; i < key_count; i++) {
66 key = sorted_keys[i];
67
68 if (TT.n && strcmp(TT.n, key)) continue;
69
70 if (FLAG(d) || FLAG(only_values)) {
71 ssize_t value_len;
72 char *value = NULL;
73
74 while ((value_len = getter(file, key, NULL, 0))) {
75 if (value_len == -1) perror_msg("getxattr failed");
76 value = xzalloc(value_len+1);
77 if (getter(file, key, value, value_len) == value_len) break;
78 free(value);
79 }
80
81 if (FLAG(only_values)) {
82 if (value) printf("%s", value);
83 } else if (!value) puts(key);
84 else printf("%s=\"%s\"\n", key, value);
85 free(value);
86 } else puts(key); // Just list names.
87 }
88
89 if (!FLAG(only_values)) xputc('\n');
90 free(sorted_keys);
91 }
92
getfattr_main(void)93 void getfattr_main(void)
94 {
95 char **s;
96
97 for (s=toys.optargs; *s; s++) do_getfattr(*s);
98 }
99