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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-05-26 22:44:45 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-05-26 22:45:02 +0200
commitc42d8e4ead7c20d29bf3996a6a87db0b348f8692 (patch)
treed54116413fef92c4b542e9083e13eed2809c9278 /lib/fstree/fstree_from_dir.c
parent20a29fab6382850ac9912c1a44d2cd8101a64184 (diff)
gensquashfs: add option to simply pack an input directory
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/fstree/fstree_from_dir.c')
-rw-r--r--lib/fstree/fstree_from_dir.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/lib/fstree/fstree_from_dir.c b/lib/fstree/fstree_from_dir.c
new file mode 100644
index 0000000..fb906f1
--- /dev/null
+++ b/lib/fstree/fstree_from_dir.c
@@ -0,0 +1,189 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include "fstree.h"
+#include "util.h"
+
+#include <sys/types.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+
+static size_t path_size(tree_node_t *n)
+{
+ size_t size = 0;
+
+ while (n != NULL) {
+ size += strlen(n->name) + 1;
+ n = n->parent;
+ }
+
+ return size;
+}
+
+static char *print_path(char *ptr, tree_node_t *n)
+{
+ if (n->parent != NULL) {
+ ptr = print_path(ptr, n->parent);
+ *(ptr++) = '/';
+ strcpy(ptr, n->name);
+ return ptr + strlen(ptr);
+ }
+
+ return ptr;
+}
+
+static int populate_dir(tree_node_t *root, int fd, size_t blocksize,
+ const char *rootdir)
+{
+ size_t size, blockcount;
+ struct dirent *ent;
+ struct stat sb;
+ tree_node_t *n;
+ ssize_t ret;
+ void *ptr;
+ DIR *dir;
+ int cfd;
+
+ dir = fdopendir(fd);
+ if (dir == NULL) {
+ perror("fdopendir");
+ close(fd);
+ return -1;
+ }
+
+ for (;;) {
+ n = NULL;
+ errno = 0;
+ ent = readdir(dir);
+
+ if (ent == NULL) {
+ if (errno) {
+ perror("readdir");
+ goto fail;
+ }
+ break;
+ }
+
+ if (!strcmp(ent->d_name, "..") || !strcmp(ent->d_name, "."))
+ continue;
+
+ if (fstatat(fd, ent->d_name, &sb, AT_SYMLINK_NOFOLLOW)) {
+ perror(ent->d_name);
+ goto fail;
+ }
+
+ size = sizeof(tree_node_t) + strlen(ent->d_name) + 1;
+
+ switch (sb.st_mode & S_IFMT) {
+ case S_IFLNK:
+ size += sb.st_size + 1;
+ break;
+ case S_IFREG:
+ blockcount = sb.st_size / blocksize + 1;
+
+ size += sizeof(file_info_t);
+ size += sizeof(uint32_t) * blockcount;
+
+ size += path_size(root) + strlen(ent->d_name) + 1;
+ size += strlen(rootdir) + 2;
+ break;
+ case S_IFDIR:
+ size += sizeof(dir_info_t);
+ break;
+ }
+
+ n = calloc(1, size);
+ if (n == NULL) {
+ perror("allocating tree node");
+ goto fail;
+ }
+
+ n->uid = sb.st_uid;
+ n->gid = sb.st_gid;
+ n->mode = sb.st_mode;
+ n->parent = root;
+
+ ptr = n->payload;
+
+ switch (sb.st_mode & S_IFMT) {
+ case S_IFLNK:
+ ret = readlinkat(fd, ent->d_name, ptr, sb.st_size);
+ if (ret < 0) {
+ perror("readlink");
+ goto fail;
+ }
+
+ n->data.slink_target = ptr;
+ ptr = (char *)ptr + strlen(ptr) + 1;
+ break;
+ case S_IFBLK:
+ case S_IFCHR:
+ n->data.devno = sb.st_rdev;
+ break;
+ case S_IFDIR:
+ n->data.dir = ptr;
+ ptr = (char *)ptr + sizeof(dir_info_t);
+ break;
+ case S_IFREG:
+ n->data.file = ptr;
+ ptr = (char *)ptr + sizeof(file_info_t);
+ ptr = (char *)ptr + sizeof(uint32_t) * blockcount;
+
+ n->data.file->input_file = ptr;
+ n->data.file->size = sb.st_size;
+
+ strcpy(ptr, rootdir);
+ ptr = (char *)ptr + strlen(ptr);
+ ptr = print_path(ptr, root);
+
+ *((char*)ptr) = '/';
+ strcpy((char *)ptr + 1, ent->d_name);
+ ptr = (char *)ptr + strlen(ptr) + 1;
+ break;
+ }
+
+ n->name = ptr;
+ strcpy(ptr, ent->d_name);
+
+ n->next = root->data.dir->children;
+ root->data.dir->children = n;
+ }
+
+ for (n = root->data.dir->children; n != NULL; n = n->next) {
+ if (S_ISDIR(n->mode)) {
+ cfd = openat(fd, n->name, O_RDONLY | O_DIRECTORY);
+ if (cfd < 0) {
+ perror(n->name);
+ goto fail_dir;
+ }
+
+ if (populate_dir(n, cfd, blocksize, rootdir)) {
+ close(cfd);
+ goto fail_dir;
+ }
+ }
+ }
+
+ closedir(dir);
+ return 0;
+fail:
+ free(n);
+fail_dir:
+ closedir(dir);
+ return -1;
+}
+
+int fstree_from_dir(fstree_t *fs, const char *path)
+{
+ int fd = open(path, O_RDONLY | O_DIRECTORY);
+
+ if (fd < 0) {
+ perror(path);
+ return -1;
+ }
+
+ return populate_dir(fs->root, fd, fs->block_size, path);
+}