aboutsummaryrefslogtreecommitdiff
path: root/toys/chown.c
blob: 217e393f94c8fdd1d0baeddd37e1aeb3c27eaa9b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/* vi: set sw=4 ts=4:
 *
 * chown.c - Change ownership
 *
 * Copyright 2012 Georgi Chorbadzhiyski <georgi@unixsol.org>
 *
 * See http://pubs.opengroup.org/onlinepubs/009695399/utilities/chown.html
 *
 * TODO: Add support for -h
 * TODO: Add support for -H
 * TODO: Add support for -L
 * TODO: Add support for -P

USE_CHOWN(NEWTOY(chown, "<2Rfv", TOYFLAG_BIN))

config CHOWN
	bool "chown"
	default y
	help
	  usage: chown [-R] [-f] [-v] group file...
	  Change ownership of one or more files.

	  -R	recurse into subdirectories.
	  -f	suppress most error messages.
	  -v	verbose output.
*/

#include "toys.h"

#define FLAG_R 4
#define FLAG_f 2
#define FLAG_v 1

DEFINE_GLOBALS(
	uid_t owner;
	gid_t group;
	char *owner_name;
	char *group_name;
)

#define TT this.chown

static int do_chown(const char *path) {
	int ret = chown(path, TT.owner, TT.group);
	if (toys.optflags & FLAG_v)
		xprintf("chown(%s:%s, %s)\n", TT.owner_name, TT.group_name, path);
	if (ret == -1 && !(toys.optflags & FLAG_f))
		perror_msg("changing owner of '%s' to '%s:%s'", path,
			TT.owner_name, TT.group_name);
	toys.exitval |= ret;
	return ret;
}

// Copied from toys/cp.c:cp_node()
int chown_node(char *path, struct dirtree *node)
{
	char *s = path + strlen(path);
	struct dirtree *n = node;

	for ( ; ; n = n->parent) {
		while (s!=path) {
			if (*(--s) == '/') break;
		}
		if (!n) break;
	}
	if (s != path) s++;

	do_chown(s);

	return 0;
}

void chown_main(void)
{
	char **s;
	char *owner = NULL, *group;
	char *param1 = *toys.optargs;

	TT.owner = -1;
	TT.group = -1;
	TT.owner_name = "";
	TT.group_name = "";

	group = strchr(param1, ':');
	if (!group)
		group = strchr(param1, '.');

	if (group) {
		group++;
		struct group *g = getgrnam(group);
		if (!g) {
			error_msg("invalid group '%s'", group);
			toys.exitval = 1;
			return;
		}
		TT.group = g->gr_gid;
		TT.group_name = group;
		owner = param1;
		owner[group - owner - 1] = '\0';
	} else {
		owner = param1;
	}

	if (owner && owner[0]) {
		struct passwd *p = getpwnam(owner);
		if (!p) {
			error_msg("invalid owner '%s'", owner);
			toys.exitval = 1;
			return;
		}
		TT.owner = p->pw_uid;
		TT.owner_name = owner;
	}

	if (toys.optflags & FLAG_R) {
		// Recurse into subdirectories
		for (s=toys.optargs + 1; *s; s++) {
			struct stat sb;
			if (stat(*s, &sb) == -1) {
				if (!(toys.optflags & FLAG_f))
					perror_msg("%s", *s);
				continue;
			}
			do_chown(*s);
			if (S_ISDIR(sb.st_mode)) {
				strncpy(toybuf, *s, sizeof(toybuf) - 1);
				toybuf[sizeof(toybuf) - 1] = 0;
				dirtree_read(toybuf, NULL, chown_node);
			}
		}
	} else {
		// Do not recurse
		for (s=toys.optargs + 1; *s; s++) {
			do_chown(*s);
		}
	}
}