[Buildroot] [PATCH] support/dependencies: add a check for a suitable gzip

Yann E. MORIN yann.morin.1998 at free.fr
Fri Nov 16 19:38:25 UTC 2018


Thomas, All,

On 2018-11-16 16:32 +0100, Thomas Petazzoni spake thusly:
> On Fri, 16 Nov 2018 16:27:19 +0100, Yann E. MORIN wrote:
> > Recently, some hash mismatch have been reported, both by users as well
> > as autobuilder failures, about tarballs generated from git repositories.
> > 
> > This turned out to be caused by users having the 'gzip' command somehow
> > aliased to 'pigz' (which stand for: parallel implementation of gzip,
> > which takes advantage of multi-processor system to parallelise the
> > compression).
> > 
> > Unfortunately, the output of pigz-compressed archives differ from that
> > of gzip (even though they *are* valid gzip-compressed streams).
> > 
> > Add a dependency check that ensures that gzip is not pigz. If that is
> > the case, bail out and refuse to build.
> > 
> > This is a stop-gap measure in preparation of the release. A complete
> > solution would accept pigz as a decompressor (because that is totally
> > OK), and ensure that we do build a host-gzip package should that be
> > needed. This is a much bigger endeavour, so this simple solution is
> > deemed enough for the release (after all, use of pigz is just atypical
> > enough that it should not pose such a problem for users to reverti to
> > using plain gzip).
> 
> Is it really that more complicated to add and use host-gzip ?

We need to add an actual host-gzip package, then ensure it is used when
needed (e.g. in _DOWNLOAD_DEPENDENCIES of git/svn/cvs based packages).

Definitiely not overly complex as I stated, no, but I was mostly looking
through the release-incoming prism, with a goal to do the strict minimum
to fail in a sane way, and was seeing the host-gzip as too far reaching
for the release.

But I can do that if you prefer.

> (This is a real question, not one asked with some irony.)

;-)

Even then, I can stomach a bit of irony. Even if I am very often
incapable of noticing it. :-]

Regards,
Yann E. MORIN.


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