[PATCH] erofs-utils: fix `--blobdev=X`

[Hongbo Li]

On 2025/4/27 10:15, Gao Xiang wrote:
> Create one if the file doesn't exist.
> 
> Fixes: b6b741d8daaf ("erofs-utils: lib: get rid of tmpfile()")

I think the real fixes should be Fixes: bbeec3c93076 ("erofs-utils: 
mkfs: add extra blob device support").
> Signed-off-by: Gao Xiang <hsiangkao at linux.alibaba.com>
> ---
>   lib/blobchunk.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/blobchunk.c b/lib/blobchunk.c
> index e6386d6..301f46a 100644
> --- a/lib/blobchunk.c
> +++ b/lib/blobchunk.c
> @@ -627,7 +627,8 @@ int erofs_blob_init(const char *blobfile_path, erofs_off_t chunksize)
>   		blobfile = erofs_tmpfile();
>   		multidev = false;
>   	} else {
> -		blobfile = open(blobfile_path, O_WRONLY | O_BINARY);
> +		blobfile = open(blobfile_path, O_WRONLY | O_CREAT |
> +						O_TRUNC | O_BINARY, 0666);
To maintain consistency, is it better to set the default permission to 0644?

Thanks,
Hongbo
>   		multidev = true;
>   	}
>   	if (blobfile < 0)