[PATCH] erofs-utils: stop mkfs when access permission denied

[Li Guifu]

It would not has the permission to access one file when mkfs.erofs
was not run in the root mode, eg run without sudo, So stop and
exit immediately

Signed-off-by: Li Guifu <bluce.lee at aliyun.com>
---
 lib/inode.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/inode.c b/lib/inode.c
index fee5c96..4641561 100644
--- a/lib/inode.c
+++ b/lib/inode.c
@@ -364,6 +364,7 @@ int erofs_write_file(struct erofs_inode *inode)
 	}
 
 	/* fallback to all data uncompressed */
+	errno = 0;
 	fd = open(inode->i_srcpath, O_RDONLY | O_BINARY);
 	if (fd < 0)
 		return -errno;
@@ -908,7 +909,9 @@ struct erofs_inode *erofs_mkfs_build_tree(struct erofs_inode *dir)
 			if (ret)
 				return ERR_PTR(ret);
 		} else {
-			erofs_write_file(dir);
+			ret = erofs_write_file(dir);
+			if (ret)
+				return ERR_PTR(ret);
 		}
 
 		erofs_prepare_inode_buffer(dir);
@@ -982,10 +985,11 @@ struct erofs_inode *erofs_mkfs_build_tree(struct erofs_inode *dir)
 
 		d->inode = erofs_mkfs_build_tree_from_path(dir, buf);
 		if (IS_ERR(d->inode)) {
+			ret = PTR_ERR(d->inode);
 fail:
 			d->inode = NULL;
 			d->type = EROFS_FT_UNKNOWN;
-			continue;
+			goto err_closedir;
 		}
 
 		d->type = erofs_type_by_mode[d->inode->i_mode >> S_SHIFT];
-- 
2.17.1