From: Simon Tournier <zimon.toutoune@gmail.com>
To: Emmanuel Medernach <Emmanuel.Medernach@iphc.cnrs.fr>,
guix-science@gnu.org
Subject: Re: Problem with guix copy
Date: Tue, 19 Mar 2024 11:26:17 +0100 [thread overview]
Message-ID: <87jzlyikl2.fsf@gmail.com> (raw)
In-Reply-To: <daa00538-cd40-4ea6-9b40-3725fd66fd47@iphc.cnrs.fr>
Hi Emmanuel,
> Machine_B # guix copy --from=Machine_A bazel --dry-run
> The following derivation would be built:
> /gnu/store/0lscmi07b2y0aw6hscbgm2h7nqwc6sb1-bazel-6.4.0.drv
Could you share this derivation file? And the one from Machine A?
To be precise, on Machine B, you should get:
$ guix time-machine -q -C channels.scm -- build --no-grafts bazel -d
/gnu/store/dnwdzl84cxgk232cwh8843f3dhqmyd69-bazel-6.4.0.drv
And on Machine A, you get another one, right?
For instance, run this command on both machines:
cp \
$(guix time-machine -q -C channels.scm -- build --no-grafts bazel -d) \
/tmp/machine-X.drv
where X is A or B, respectively.
These files track exactly how the item is built (derived). Therefore,
since the hash of the output differs, you should differ somewhere.
Previously, you checked about the inputs, now we need to compare the
complete derivation.
Cheers,
simon
PS: Please note that the content of two store items might be bit-to-bit
identical with different store item paths (hash).
Consider the example with the exact same source where the difference
is just one comment somewhere in the code. Then, their hashes are
different. However, once compiled the binaries are identical
(compiler usually removes comments).
Since the hash of one input (source) differs, then the store item
paths are different but the content of these both store items are
bit-to-bit identical.
The machinery to track down the origin of the difference is all
these derivation .drv files.
next prev parent reply other threads:[~2024-03-19 11:02 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-15 9:14 Problem with guix copy Emmanuel Medernach
2024-03-15 9:21 ` Emmanuel Medernach
2024-03-15 13:58 ` Emmanuel Medernach
2024-03-15 14:10 ` Andreas Enge
2024-03-15 14:37 ` Emmanuel Medernach
2024-03-15 14:50 ` Emmanuel Medernach
2024-03-19 10:26 ` Simon Tournier [this message]
2024-03-19 15:40 ` Emmanuel Medernach
2024-03-19 15:51 ` Emmanuel Medernach
2024-03-21 22:19 ` Simon Tournier
2024-03-25 10:13 ` Emmanuel Medernach
2024-03-27 13:05 ` Simon Tournier
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87jzlyikl2.fsf@gmail.com \
--to=zimon.toutoune@gmail.com \
--cc=Emmanuel.Medernach@iphc.cnrs.fr \
--cc=guix-science@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/guix.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.