[PATCH] erofs-utils: lib: support GNUTYPE_LONGNAME for tarerofs

[Jingbo Xu]

On 7/17/23 3:35 PM, Gao Xiang wrote:
> The 'L' entry is present in a header for a series of 1 or more 512-byte
> tar blocks that hold just the filename for a file or directory with a
> name over 100 chars.
> 
> Following that series is another header block, in the traditional form:
>    A header with type '0' (regular file) or '5' (directory), followed by
>    the appropriate number of data blocks with the entry data.
> 
> In the header for this series, the name will be truncated to the 1st 100
> characters of the actual name.
> 
> Cc: Jingbo Xu <jefflexu at linux.alibaba.com>
> Signed-off-by: Gao Xiang <hsiangkao at linux.alibaba.com>
> ---
>  lib/tar.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/lib/tar.c b/lib/tar.c
> index 8edfe75..b62e562 100644
> --- a/lib/tar.c
> +++ b/lib/tar.c
> @@ -570,6 +570,14 @@ restart:
>  		if (ret)
>  			goto out;
>  		goto restart;
> +	} else if (th.typeflag == 'L') {
> +		free(eh.path);
> +		eh.path = malloc(st.st_size + 1);
> +		if (st.st_size != erofs_read_from_fd(tar->fd, eh.path,
> +						     st.st_size))
> +			goto invalid_tar;
> +		eh.path[st.st_size] = '\0';
> +		goto restart;
>  	} else if (th.typeflag == 'K') {
>  		free(eh.link);
>  		eh.link = malloc(st.st_size + 1);

LGTM.

Tested-by: Jingbo Xu <jefflexu at linux.alibaba.com>

-- 
Thanks,
Jingbo