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bug#26225: [PATCH] guix: Compress and decompress xz archives in parallel

From: Kei Kebreau
Subject: bug#26225: [PATCH] guix: Compress and decompress xz archives in parallel.
Date: Fri, 31 Mar 2017 13:56:37 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

Leo Famulari <address@hidden> writes:

> Efraim Flashner wrote:
>> * guix/scripts/pack.scm (%compressors): Add flag '-T0' when calling "xz".
>> * guix/utils.scm (decompressed-port, compressed-port,
>> compressed-output-port): Same.
>> --- a/guix/utils.scm
>> +++ b/guix/utils.scm
>> @@ -154,7 +155,7 @@ a symbol such as 'xz."
>>    (match compression
>>      ((or #f 'none) (values input '()))
>>      ('bzip2        (filtered-port `(,%bzip2 "-dc") input))
>> -    ('xz           (filtered-port `(,%xz "-dc") input))
>> +    ('xz           (filtered-port `(,%xz "-dc -T0") input))
>>      ('gzip         (filtered-port `(,%gzip "-dc") input))
>>      (else          (error "unsupported compression scheme" compression))))
> Parallel decompression isn't implemented yet, but the extra '-T0' option
> doesn't seem to break anything.
> The changes LGTM.
> I sent a companion patch to <> that enables
> threaded compression when building source tarballs.

LGTM as well.

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