Re: [gentoo-portage-dev] [PATCH 1/3] ecompress: Fix crash on duplicate compressed & uncompressed files

[Zac Medico]

On 09/25/2018 12:18 PM, Michał Górny wrote:
> Fix crash due to race condition in handling the same file being present
> both in compressed and uncompressed variants.  If that is the case,
> just queue the uncompressed variant for compression, and ignore
> the other compressed variants.
>
> Bug: https://bugs.gentoo.org/667072
> Signed-off-by: Michał Górny <mgorny@g.o>
> ---
>  bin/ecompress | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/bin/ecompress b/bin/ecompress
> index 36bdb585b..d5ff3796c 100755
> --- a/bin/ecompress
> +++ b/bin/ecompress
> @@ -49,6 +49,13 @@ while [[ $# -gt 0 ]] ; do
>  				find_args+=( -size "+${PORTAGE_DOCOMPRESS_SIZE_LIMIT}c" )
>
>  			while IFS= read -d '' -r path; do
> +				# if both compressed and uncompressed variant exists,
> +				# skip the compressed variants (bug #667072)
> +				case ${path} in
> +					*.Z|*.gz|*.bz2|*.lzma|*.xz)
> +						[[ -s ${path%.*} ]] && continue
> +						;;
> +				esac

In theory, we'd still have a problem if the file existed with muliple
compressions, right? Maybe a good solution is to strip the compression
extension here, and then have ecompress-file check for duplicates?

>  				>> "${path}.ecompress" || die
>  			done < <(find "${find_args[@]}" -print0 || die)
>  		fi
>


-- 
Thanks,
Zac