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* Re: Why unrelated package trigger rebuild?
@ 2020-10-09 16:26 zimoun
  0 siblings, 0 replies; 3+ messages in thread
From: zimoun @ 2020-10-09 16:26 UTC (permalink / raw)
  To: Guix Devel

Hi Chris,

I have investigate a bit.


On Fri, 9 Oct 2020 at 09:52, Christopher Baines <mail@cbaines.net> wrote:

> > <https://data.guix.gnu.org/repository/1/branch/master/package/ghc-haddock/output-history>

The webpage reads, anti-chronological order:

j5llsz…-ghc-haddock-2.22.0 392220 1a2759
s7s3ks…-ghc-haddock-2.22.0 20cc8f 20cc8f
lw2qzd…-ghc-haddock-2.22.0 8ab70b c1f385

where the log is:

--8<---------------cut here---------------start------------->8---
$ git --no-pager guix log --oneline 20cc8f9487^^..3922208091
3922208091 gnu: Add dkgpg.
d51cb7f85f gnu: Add libtmcg.

[...]

12dc9f58c4 gnu: gcc: Fix libstdc++ misconfiguration.
b1d3c122e1 gnu: gcc@10: Update to 10.2.0.
c1f38577c8 gnu: Add sleef.
548d4d810d gnu: duplicity: Update to 0.8.14.

[...]

e239135c56 gnu: gp2c: Update to 0.0.11pl4.
7cce2a6bd4 Revert "gnu: patchelf: Update to 0.11."
20cc8f9487 gnu: patchelf: Update to 0.11.
dbdfbec957 gnu: git-annex: Update to 8.20200720.1.
--8<---------------cut here---------------end--------------->8---

Well, it is probable that there is a merge and maybe the issue is coming
from that.  Or maybe an author vs commit date.  WDYT?

What I get is:

--8<---------------cut here---------------start------------->8---
3922208091 /gnu/store/j5llszq1cf12qn79bvhc042wc06ibfix-ghc-haddock-2.22.0
d51cb7f85f /gnu/store/j5llszq1cf12qn79bvhc042wc06ibfix-ghc-haddock-2.22.0
12dc9f58c4 /gnu/store/j5llszq1cf12qn79bvhc042wc06ibfix-ghc-haddock-2.22.0

b1d3c122e1 /gnu/store/lw2qzdrx5sq9qrpdszx4fby05bbdhi5f-ghc-haddock-2.22.0
c1f38577c8 /gnu/store/lw2qzdrx5sq9qrpdszx4fby05bbdhi5f-ghc-haddock-2.22.0
548d4d810d /gnu/store/lw2qzdrx5sq9qrpdszx4fby05bbdhi5f-ghc-haddock-2.22.0
e239135c56 /gnu/store/lw2qzdrx5sq9qrpdszx4fby05bbdhi5f-ghc-haddock-2.22.0
7cce2a6bd4 /gnu/store/lw2qzdrx5sq9qrpdszx4fby05bbdhi5f-ghc-haddock-2.22.0

20cc8f9487 /gnu/store/s7s3ksfhkdbb6k6si8bjnxy8vvywv322-ghc-haddock-2.22.0
dbdfbec957 /gnu/store/lw2qzdrx5sq9qrpdszx4fby05bbdhi5f-ghc-haddock-2.22.0
--8<---------------cut here---------------end--------------->8---

Therefore, the first commit producing j5llsz…-ghc-haddock is not
3922208091 but 12dc9f58c4.  But what does it mean “first”? :-)

                author date              commit date
3922208091|Thu Jul 23 14:03:19 2020|Fri Jul 24 14:21:31 2020
12dc9f58c4|Fri Jul 24 09:56:25 2020|Fri Jul 24 14:21:30 2020

However, it seems more expected that

  12dc9f58c4 gnu: gcc: Fix libstdc++ misconfiguration.

introduces new hash to ’ghc-haddock’ than unrelated

  3922208091 gnu: Add dkgpg.


Maybe a possible fix is to compare “commit date” which will be more
accurate about the change (especially with merges) than “author
date”.  WDYT?


The s7s3ks…-ghc-haddock is explained by the revert so it is expected.

All the best,
simon

where the script:

--8<---------------cut here---------------start------------->8---
for ci in 3922208091 \
              d51cb7f85f \
              12dc9f58c4 \
          b1d3c122e1 \
              c1f38577c8 \
              548d4d810d \
          e239135c56 \
              7cce2a6bd4 \
              20cc8f9487 \
              dbdfbec957
do
    printf "$ci "
    guix time-machine --commit=$ci \
         -- build ghc-haddock \
         2> /dev/null
done
--8<---------------cut here---------------end--------------->8---


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: Why unrelated package trigger rebuild?
  2020-10-09  1:35 zimoun
@ 2020-10-09  7:51 ` Christopher Baines
  0 siblings, 0 replies; 3+ messages in thread
From: Christopher Baines @ 2020-10-09  7:51 UTC (permalink / raw)
  To: zimoun; +Cc: guix-devel


zimoun <zimon.toutoune@gmail.com> writes:

> Dear,
>
> From the Data Service:
>
> <https://data.guix.gnu.org/repository/1/branch/master/package/ghc-haddock/output-history>
>
> the commit 39222080911eaf3d7f74effe4467c1a04464aef3 which is about the
> addition of the package ’dkgpg’ modifies the hash of the package
> ’ghc-haddock’ from:
>
>   /gnu/store/s7s3ksfhkdbb6k6si8bjnxy8vvywv322-ghc-haddock-2.22.0
>
> to:
>
>   /gnu/store/j5llszq1cf12qn79bvhc042wc06ibfix-ghc-haddock-2.22.0
>
> Well, I miss why the addition of one package changes the hash of another
> unrelated one?  Is it expected?

I think the first thing to spot is that the Guix Data Service does a
poor job of showing what happened. If you look at the 3 outputs that
start or end in July (07), the pattern isn't a neat "one after the
other".

What I think actually happens is that:

 - 2020-06-13 21:04:16:       hash begins lw2
 - 2020-07-21 21:57:03:       hash begins s7s
 - after 2020-07-21 21:57:03: hash goes back to beginning lw2
 - 2020-07-24 12:22:11:       hash begins j5l

I think one of the implicit assumptions the query for that page makes,
is that the outputs don't really repeat, and in this case, that doesn't
hold. I think there's room for improvement to try and correct that.

Sorry about that,

Chris


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Why unrelated package trigger rebuild?
@ 2020-10-09  1:35 zimoun
  2020-10-09  7:51 ` Christopher Baines
  0 siblings, 1 reply; 3+ messages in thread
From: zimoun @ 2020-10-09  1:35 UTC (permalink / raw)
  To: Guix Devel

Dear,

From the Data Service:

<https://data.guix.gnu.org/repository/1/branch/master/package/ghc-haddock/output-history>

the commit 39222080911eaf3d7f74effe4467c1a04464aef3 which is about the
addition of the package ’dkgpg’ modifies the hash of the package
’ghc-haddock’ from:

  /gnu/store/s7s3ksfhkdbb6k6si8bjnxy8vvywv322-ghc-haddock-2.22.0

to:

  /gnu/store/j5llszq1cf12qn79bvhc042wc06ibfix-ghc-haddock-2.22.0

Well, I miss why the addition of one package changes the hash of another
unrelated one?  Is it expected?


All the best,
simon


^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2020-10-09 17:36 UTC | newest]

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