summaryrefslogtreecommitdiff
path: root/unpack/restore_fstree.c
blob: 355bbb5959e3d35592a886e3b8e3bb84b62285f8 (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
/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "rdsquashfs.h"

static int create_node(tree_node_t *n, unsqfs_info_t *info)
{
	char *name;
	int fd;

	if (!(info->flags & UNPACK_QUIET)) {
		name = fstree_get_path(n);
		printf("unpacking %s\n", name);
		free(name);
	}

	switch (n->mode & S_IFMT) {
	case S_IFDIR:
		if (mkdir(n->name, 0755) && errno != EEXIST) {
			fprintf(stderr, "mkdir %s: %s\n",
				n->name, strerror(errno));
			return -1;
		}

		if (pushd(n->name))
			return -1;

		for (n = n->data.dir->children; n != NULL; n = n->next) {
			if (create_node(n, info))
				return -1;
		}

		if (popd())
			return -1;
		break;
	case S_IFLNK:
		if (symlink(n->data.slink_target, n->name)) {
			fprintf(stderr, "ln -s %s %s: %s\n",
				n->data.slink_target, n->name,
				strerror(errno));
			return -1;
		}
		break;
	case S_IFSOCK:
	case S_IFIFO:
		if (mknod(n->name, (n->mode & S_IFMT) | 0700, 0)) {
			fprintf(stderr, "creating %s: %s\n",
				n->name, strerror(errno));
			return -1;
		}
		break;
	case S_IFBLK:
	case S_IFCHR:
		if (mknod(n->name, n->mode & S_IFMT, n->data.devno)) {
			fprintf(stderr, "creating device %s: %s\n",
				n->name, strerror(errno));
			return -1;
		}
		break;
	case S_IFREG:
		fd = open(n->name, O_WRONLY | O_CREAT | O_EXCL, 0600);
		if (fd < 0) {
			fprintf(stderr, "creating %s: %s\n",
				n->name, strerror(errno));
			return -1;
		}

		if (extract_file(n->data.file, info, fd)) {
			close(fd);
			return -1;
		}

		close(fd);
		break;
	default:
		break;
	}

	if (info->flags & UNPACK_CHOWN) {
		if (fchownat(AT_FDCWD, n->name, n->uid, n->gid,
			     AT_SYMLINK_NOFOLLOW)) {
			fprintf(stderr, "chown %s: %s\n",
				n->name, strerror(errno));
			return -1;
		}
	}

	if (info->flags & UNPACK_CHMOD) {
		if (fchmodat(AT_FDCWD, n->name, n->mode,
			     AT_SYMLINK_NOFOLLOW)) {
			fprintf(stderr, "chmod %s: %s\n",
				n->name, strerror(errno));
			return -1;
		}
	}
	return 0;
}

int restore_fstree(const char *rootdir, tree_node_t *root, unsqfs_info_t *info)
{
	tree_node_t *n;

	if (rootdir != NULL) {
		if (mkdir_p(rootdir))
			return -1;

		if (pushd(rootdir))
			return -1;
	}

	if (S_ISDIR(root->mode)) {
		for (n = root->data.dir->children; n != NULL; n = n->next) {
			if (create_node(n, info))
				return -1;
		}
	} else {
		if (create_node(root, info))
			return -1;
	}

	return rootdir == NULL ? 0 : popd();
}