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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "unsquashfs.h"
static int restore_directory(int dirfd, tree_node_t *n, compressor_t *cmp,
size_t block_size, frag_reader_t *frag,
int sqfsfd, int flags)
{
int fd;
for (n = n->data.dir->children; n != NULL; n = n->next) {
switch (n->mode & S_IFMT) {
case S_IFDIR:
if (mkdirat(dirfd, n->name, 0755) &&
errno != EEXIST) {
fprintf(stderr, "mkdir %s: %s\n",
n->name, strerror(errno));
return -1;
}
fd = openat(dirfd, n->name, O_RDONLY | O_DIRECTORY);
if (fd < 0) {
fprintf(stderr, "open dir %s: %s\n",
n->name, strerror(errno));
return -1;
}
if (restore_directory(fd, n, cmp, block_size,
frag, sqfsfd, flags)) {
close(fd);
return -1;
}
close(fd);
break;
case S_IFLNK:
if (symlinkat(n->data.slink_target, dirfd, 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 (mknodat(dirfd, 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 (mknodat(dirfd, 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 = openat(dirfd, 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, cmp, block_size,
frag, sqfsfd, fd)) {
close(fd);
return -1;
}
close(fd);
break;
default:
break;
}
if (flags & UNPACK_CHOWN) {
if (fchownat(dirfd, n->name, n->uid, n->gid,
AT_SYMLINK_NOFOLLOW)) {
fprintf(stderr, "chown %s: %s\n",
n->name, strerror(errno));
return -1;
}
}
if (flags & UNPACK_CHMOD) {
if (fchmodat(dirfd, 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, compressor_t *cmp,
size_t block_size, frag_reader_t *frag, int sqfsfd,
int flags)
{
int dirfd;
if (mkdir_p(rootdir))
return -1;
dirfd = open(rootdir, O_RDONLY | O_DIRECTORY);
if (dirfd < 0) {
perror(rootdir);
return -1;
}
if (restore_directory(dirfd, root, cmp, block_size, frag,
sqfsfd, flags)) {
close(dirfd);
return -1;
}
close(dirfd);
return 0;
}
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