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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-05-03 21:44:59 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-05-03 21:45:46 +0200
commit9de5c93986bc6a4b33f3f50ed2a94c9aa3a33c7f (patch)
tree592a91bb99de624139de9f64d0fc4e2716889891 /unpack/restore_fstree.c
parent11163f69106c88736499ca3ec3a9972bcdcd0c26 (diff)
unsquashfs: add code to unpack the entire file system
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'unpack/restore_fstree.c')
-rw-r--r--unpack/restore_fstree.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/unpack/restore_fstree.c b/unpack/restore_fstree.c
new file mode 100644
index 0000000..56c3cc5
--- /dev/null
+++ b/unpack/restore_fstree.c
@@ -0,0 +1,105 @@
+/* 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 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, n->mode) &&
+ 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)) {
+ 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, 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, 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, n->mode);
+ 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;
+ }
+ }
+
+ 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 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)) {
+ close(dirfd);
+ return -1;
+ }
+
+ close(dirfd);
+ return 0;
+}