Re: Fedora 31 System-Wide Change proposal: Switch RPMs to zstd compression

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On Thursday, May 30, 2019 10:38:25 AM CEST Miroslav Suchý wrote:
> Dne 29. 05. 19 v 23:52 Josh Boyer napsal(a):
> > If we did this, wouldn't it make it very difficult to use tools like
> > mock on RHEL / CentOS 7 to build for Fedora 3x?
> 
> Speaking of Mock:
> Either the RPM on host need to understand the new format/compression **or**
> the packages in @buildsys group (including transitional deps) have to be in
> old format - then you can build for Fedora 3x using bootstrap feature.

I need to underline this, it would be really really really bad if we were
not able to --installroot fedora chroots at least on RHEL 8.  How likely
is a backport of zstd support into RPM in EL7+?

Regarding @buildsys group and compat compression;  if we were OK to use
`mock --bootstrap-chroot`, we could limit the package compatibility set
(not really subset) to dnf + dnf-utils + deps (see dnf_install_command in
site-defaults.cfg).  But TBH I don't view this idea as feasible/maintainable
solution, "Requires:" do change all the time...

Another slightly more realistic way around would be to not --installroot
the bootstrap chroot in mock, but rely on some distributed "bootstrap"
root cache tarball (a standard, safe way) instead.

> Both of them would be painful.

Typo: "having none of them would be painful", and very likely to happen.

Pavel


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