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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* restore_fstree.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "rdsquashfs.h"
static int create_node(tree_node_t *n, int flags)
{
tree_node_t *c;
int fd, ret;
char *name;
if (!(flags & UNPACK_QUIET)) {
name = fstree_get_path(n);
printf("creating %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 (c = n->data.dir->children; c != NULL; c = c->next) {
if (create_node(c, flags))
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;
}
close(fd);
if (n->parent != NULL) {
n->data.file->input_file = fstree_get_path(n);
} else {
n->data.file->input_file = strdup(n->name);
}
if (n->data.file->input_file == NULL) {
perror("restoring file path");
return -1;
}
ret = canonicalize_name(n->data.file->input_file);
assert(ret == 0);
break;
default:
break;
}
return 0;
}
static int set_attribs(fstree_t *fs, tree_node_t *n, int flags)
{
tree_node_t *c;
if (S_ISDIR(n->mode)) {
if (pushd(n->name))
return -1;
for (c = n->data.dir->children; c != NULL; c = c->next) {
if (set_attribs(fs, c, flags))
return -1;
}
if (popd())
return -1;
}
#ifdef HAVE_SYS_XATTR_H
if ((flags & UNPACK_SET_XATTR) && n->xattr != NULL) {
size_t i, len, kidx, vidx;
const char *key, *value;
for (i = 0; i < n->xattr->num_attr; ++i) {
kidx = n->xattr->attr[i].key_index;
vidx = n->xattr->attr[i].value_index;
key = str_table_get_string(&fs->xattr_keys, kidx);
value = str_table_get_string(&fs->xattr_values, vidx);
len = strlen(value);
if (lsetxattr(n->name, key, value, len, 0)) {
fprintf(stderr,
"setting xattr '%s' on %s: %s\n",
key, n->name, strerror(errno));
return -1;
}
}
}
#else
(void)fs;
#endif
if (flags & UNPACK_SET_TIMES) {
struct timespec times[2];
memset(times, 0, sizeof(times));
times[0].tv_sec = n->mod_time;
times[1].tv_sec = n->mod_time;
if (utimensat(AT_FDCWD, n->name, times, AT_SYMLINK_NOFOLLOW)) {
fprintf(stderr, "setting timestamp on %s: %s\n",
n->name, strerror(errno));
return -1;
}
}
if (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 (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(tree_node_t *root, int flags)
{
tree_node_t *n, *old_parent;
/* make sure fstree_get_path() stops at this node */
old_parent = root->parent;
root->parent = NULL;
if (S_ISDIR(root->mode)) {
for (n = root->data.dir->children; n != NULL; n = n->next) {
if (create_node(n, flags))
return -1;
}
} else {
if (create_node(root, flags))
return -1;
}
root->parent = old_parent;
return 0;
}
int update_tree_attribs(fstree_t *fs, tree_node_t *root, int flags)
{
if ((flags & (UNPACK_CHOWN | UNPACK_CHMOD | UNPACK_SET_TIMES)) == 0)
return 0;
return set_attribs(fs, root, flags);
}
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