bug#39575: guix time-machine fails when a tarball was modified in-place

[zimoun]

Hi Ludo,

On Thu, 13 Feb 2020 at 22:34, Ludovic Courtès <address@hidden> wrote:
>
> Hi,
>
> Jan Nieuwenhuizen <address@hidden> skribis:
>
> > building 
> > /gnu/store/cjim33x0q1bv1ppkv3qijvr1pvsn4y0q-harfbuzz-2.4.0.tar.bz2.drv...
> > downloading from 
> > https://www.freedesktop.org/software/harfbuzz/release/harfbuzz-2.4.0.tar.bz2...
> > |offloading build of 
> > /gnu/store/6fgg1irkcvqyb4f9f8n0nzi5gknyqhfn-gcc-mesboot1-4.7.4.drv to 
> > 'kluit.dezyne.org'
> > - 'build' phasesha256 hash mismatch for 
> > /gnu/store/b4cdp9sp44848348lrpzbfafhmjqf8nr-harfbuzz-2.4.0.tar.bz2:
> >   expected hash: 1mpah6kwqid1kxsj4rwqsniivqbrx231j65v51yncx6s0dch0dch
> >   actual hash:   0vrkvdlmihdg62a4c6h5kx27khc33xmb95l50zgnwnavvpwyyw5l
> > hash mismatch for store item 
> > '/gnu/store/b4cdp9sp44848348lrpzbfafhmjqf8nr-harfbuzz-2.4.0.tar.bz2'
>
> The file itself is still available on our machines though, and you can
> get it with:
>
>   guix download -o harfbuzz-2.4.0.tar.bz2 \
>   
> https://ci.guix.gnu.org/file/harfbuzz-2.4.0.tar.bz2/sha256/0vrkvdlmihdg62a4c6h5kx27khc33xmb95l50zgnwnavvpwyyw5l

Maybe I miss a point, but the file we need is the old one, not the new
one, i.e., the one with the expected hash
1mpah6kwqid1kxsj4rwqsniivqbrx231j65v51yncx6s0dch0dch. And I should do
wrong but ci.guix.gnu.org does not have this file -- otherwise it will
find it because of substitutes mechanism.

--8<---------------cut here---------------start------------->8---
 $ guix download -o /tmp/harfbuzz-old.tar.bz2 \
 
https://ci.guix.gnu.org/file/harfbuzz-2.4.0.tar.bz2/sha256/1mpah6kwqid1kxsj4rwqsniivqbrx231j65v51yncx6s0dch0dch

Starting download of /tmp/harfbuzz-old.tar.bz2
>From 
>https://ci.guix.gnu.org/file/harfbuzz-2.4.0.tar.bz2/sha256/1mpah6kwqid1kxsj4rwqsniivqbrx231j65v51yncx6s0dch0dch...
download failed
"https://ci.guix.gnu.org/file/harfbuzz-2.4.0.tar.bz2/sha256/1mpah6kwqid1kxsj4rwqsniivqbrx231j65v51yncx6s0dch0dch";
404 "Not Found"
failed to download "/tmp/harfbuzz-old.tar.bz2" from
"https://ci.guix.gnu.org/file/harfbuzz-2.4.0.tar.bz2/sha256/1mpah6kwqid1kxsj4rwqsniivqbrx231j65v51yncx6s0dch0dch";
guix download: error: open-file: No such file or directory:
"/tmp/harfbuzz-old.tar.bz2"
--8<---------------cut here---------------end--------------->8---



Cheers,
simon