Commit 79ec651a286c71a3d4c72be33a1f80e76a560031 introduced a check to
error out when attempting to use ‘time-machine’ to travel to a commit
before ‘v1.0.0’.
This commit fixes a performance issue with the strategy used in
79ec651a286c71a3d4c72be33a1f80e76a560031 (the repository was opened,
updated, and traversed a second time by ‘validate-guix-channel’) as well
as a user interface issue (“Updating channel” messages would be printed
too late).
This patch reimplements the check in terms of the existing #:validate-pull
mechanism, which is designed to avoid extra repository operations.
Fixes <https://issues.guix.gnu.org/65788>.
* guix/inferior.scm (cached-channel-instance): Change default value
of #:validate-channels. Remove call to VALIDATE-CHANNELS; pass it
as #:validate-pull to ‘latest-channel-instances’.
* guix/scripts/time-machine.scm (%reference-channels): New variable.
(validate-guix-channel): New procedure, written as a simplification of…
(guix-time-machine)[validate-guix-channel]: … this. Remove.
Pass #:reference-channels to ‘cached-channel-instance’.
Reported-by: Simon Tournier <zimon.toutoune@gmail.com>
Change-Id: I9b0ec61fba7354fe08b04a91f4bd32b72a35460c
* guix/scripts/time-machine.scm (guix-time-machine)
<validate-guix-channel>: Update doc. Fall-back to use the Guix channel
reference when REF is #f.
Reported-by: Simon Tournier <zimon.toutoune@gmail.com>
Co-authored-by: Simon Tournier <zimon.toutoune@gmail.com>
* doc/guix.texi (Invoking guix time-machine): Document limitation.
* guix/inferior.scm (cached-channel-instance): New VALIDATE-CHANNELS
argument. Use it to validate channels when there are no cache hit.
* guix/scripts/time-machine.scm
(%options): Tag the given reference with 'tag-or-commit instead of 'commit.
(%oldest-possible-commit): New variable.
(guix-time-machine) <validate-guix-channel>: New nested procedure. Pass it to
the 'cached-channel-instance' call.
* tests/guix-time-machine.sh: New test.
* Makefile.am (SH_TESTS): Register it.
Suggested-by: Simon Tournier <zimon.toutoune@gmail.com>
Reviewed-by: Ludovic Courtès <ludo@gnu.org>
Reviewed-by: Simon Tournier <zimon.toutoune@gmail.com>
This was obtained by setting up this environment:
guix shell -D guix --with-input=guile@3.0.9=guile-next \
--with-commit=guile-next=e2ed33ef0445c867fe56c247054aa67e834861f2
-- make -j5
then adding 'unused-module' to (@@ (guix build compiler) %warnings),
building, and checking all the "unused module" warnings and removing
those that were definitely unused.
This allows the user of 'cached-channel-instance' to install the build
handler of its choice. In particular, it allows "guix time-machine" to
install a build notifier with the right options instead of using the
defaults that 'cached-channel-instance' would pass to
'show-what-to-build*'.
* guix/inferior.scm (cached-channel-instance): Remove call to
'show-what-to-build*'.
(inferior-for-channels): Wrap body in 'with-build-handler'.
* guix/scripts/time-machine.scm (guix-time-machine): Use
'with-build-handler'.
Break cached-channel-instance into two different procedures:
channels->cached-profile and instances->cached-profile operating respectively
on channels and channels instances.
* guix/inferior.scm (cached-channel-instance): Rename it into ...
(cached-profile): ... this new procedure.
(channels->cached-profile, instances->cached-profile): New procedures.
* guix/scripts/time-machine.scm (guix-time-machine): Adapt accordingly.
* guix/inferior.scm (cached-channel-instance): Take an explicit 'store'
argument.
(inferior-for-channels): Wrap call to 'cached-channel-instance' in
'with-store'.
* guix/time-machine.scm (guix-time-machine): Wrap call to
'cached-channel-instance' in 'with-store'.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
* guix/scripts/time-machine.scm: New file.
* Makefile.am: (MODULES): Add it.
* guix/scripts/pull.scm (channel-list): Export.
* guix/inferior.scm (cached-channel-instance): New procedure.
(inferior-for-channels): Use it.
* doc/guix.texi (Invoking guix time-machine): New section.
(Channels): Cross-reference it.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
