fs/squashfs: implement exists() function
This permits to find a file and use the distro_bootcmd
Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
diff --git a/fs/fs.c b/fs/fs.c
index fb27c91..7a40206 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -296,7 +296,7 @@
.size = sqfs_size,
.close = sqfs_close,
.closedir = sqfs_closedir,
- .exists = fs_exists_unsupported,
+ .exists = sqfs_exists,
.uuid = fs_uuid_unsupported,
.write = fs_write_unsupported,
.ln = fs_ln_unsupported,
diff --git a/fs/squashfs/sqfs.c b/fs/squashfs/sqfs.c
index 80a85e7..608a2bb 100644
--- a/fs/squashfs/sqfs.c
+++ b/fs/squashfs/sqfs.c
@@ -1649,6 +1649,44 @@
return ret;
}
+int sqfs_exists(const char *filename)
+{
+ struct fs_dir_stream *dirsp = NULL;
+ struct squashfs_dir_stream *dirs;
+ char *dir, *file;
+ struct fs_dirent *dent;
+ int ret;
+
+ sqfs_split_path(&file, &dir, filename);
+ /*
+ * sqfs_opendir will uncompress inode and directory tables, and will
+ * return a pointer to the directory that contains the requested file.
+ */
+ ret = sqfs_opendir(dir, &dirsp);
+ if (ret) {
+ ret = -EINVAL;
+ goto free_strings;
+ }
+
+ dirs = (struct squashfs_dir_stream *)dirsp;
+
+ while (!sqfs_readdir(dirsp, &dent)) {
+ ret = strcmp(dent->name, file);
+ if (!ret)
+ break;
+ free(dirs->entry);
+ dirs->entry = NULL;
+ }
+
+ sqfs_closedir(dirsp);
+
+free_strings:
+ free(dir);
+ free(file);
+
+ return ret == 0;
+}
+
void sqfs_close(void)
{
free(ctxt.sblk);
diff --git a/include/squashfs.h b/include/squashfs.h
index 819cf8c..7489eef 100644
--- a/include/squashfs.h
+++ b/include/squashfs.h
@@ -19,6 +19,7 @@
int sqfs_read(const char *filename, void *buf, loff_t offset,
loff_t len, loff_t *actread);
int sqfs_size(const char *filename, loff_t *size);
+int sqfs_exists(const char *filename);
void sqfs_close(void);
void sqfs_closedir(struct fs_dir_stream *dirs);