From: Johannes Schindelin <Johannes.Schindelin@gmx.de>
To: Pratyush Yadav <me@yadavpratyush.com>
Cc: Bert Wesarg <bert.wesarg@googlemail.com>,
Johannes Schindelin via GitGitGadget <gitgitgadget@gmail.com>,
Git Mailing List <git@vger.kernel.org>,
Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH 1/1] respect core.hooksPath, falling back to .git/hooks
Date: Mon, 30 Sep 2019 11:42:30 +0200 (CEST) [thread overview]
Message-ID: <nycvar.QRO.7.76.6.1909301139460.46@tvgsbejvaqbjf.bet> (raw)
In-Reply-To: <20190927130539.52oir56byuedqmm3@yadavpratyush.com>
Hi,
On Fri, 27 Sep 2019, Pratyush Yadav wrote:
> On 27/09/19 08:10AM, Bert Wesarg wrote:
> > On Fri, Sep 27, 2019 at 12:40 AM Pratyush Yadav <me@yadavpratyush.com> wrote:
> > >
> > > On 26/09/19 02:17PM, Johannes Schindelin via GitGitGadget wrote:
> > > > From: Johannes Schindelin <Johannes.Schindelin@gmx.de>
> > > >
> > > > Since v2.9.0, Git knows about the config variable core.hookspath
> > > > that allows overriding the path to the directory containing the
> > > > Git hooks.
> > > >
> > > > Since v2.10.0, the `--git-path` option respects that config
> > > > variable, too, so we may just as well use that command.
> > > >
> > > > For Git versions older than v2.5.0 (which was the first version to
> > > > support the `--git-path` option for the `rev-parse` command), we
> > > > simply fall back to the previous code.
> > > >
> > > > This fixes https://github.com/git-for-windows/git/issues/1755
> > > >
> > > > Initial-patch-by: Philipp Gortan <philipp@gortan.org>
> > > > Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> > > > ---
> > > > git-gui.sh | 6 +++++-
> > > > 1 file changed, 5 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/git-gui.sh b/git-gui.sh
> > > > index fd476b6999..b2c6e7a1db 100755
> > > > --- a/git-gui.sh
> > > > +++ b/git-gui.sh
> > > > @@ -623,7 +623,11 @@ proc git_write {args} {
> > > > }
> > > >
> > > > proc githook_read {hook_name args} {
> > > > - set pchook [gitdir hooks $hook_name]
> > > > + if {[package vcompare $::_git_version 2.5.0] >= 0} {
> > > > + set pchook [git rev-parse --git-path "hooks/$hook_name"]
> > > > + } else {
> > > > + set pchook [gitdir hooks $hook_name]
> > > > + }
> > >
> > > gitdir is used in a lot of places, and I think all those would also
> > > benefit from using --git-path. So I think it is a better idea to move
> > > this to the procedure gitdir. It would have to be refactored to take any
> > > number of arguments, instead of the two it takes here.
> >
> > gitdir already takes an arbitrary number of arguments and joins them
> > to a path. The more imminent challenge is, that gitdir caches the
> > GIT_DIR, thus it tries to avoid calling "git rev-parse". Which works
> > for most, but not for hooks.
>
> What I was thinking of was something like this:
>
> - If no args are passed, then just directly return $_gitdir. This is
> already being done. I assume the GIT_DIR relocation is already
> handled by `git rev-parse --git-dir`, so this would point to the
> correct location.
> - If args are passed, then we want a subdirectory of GIT_DIR In this
> case, it is possible that this subdirectory has also been relocated
> (hooks/ being one of those subdirectories). So in this case, use
> `git rev-parse --git-path` instead.
>
> So the gitdir procedure would look something like:
>
> proc gitdir {args} {
> global $_gitdir
> if {$args eq {}} {
> # Return the cached GIT_DIR
> return $_gitdir
> }
>
> # Use `git rev-parse --git-path` to get the path instead of
> # using the cached value.
> }
>
> Am I missing something? Or does this fix the issue you describe?
The `gitdir` function is called 13 times during startup alone, and who
knows how many more times later.
So I am quite convinced that the original intention was to save on
spawning processes left and right.
But since you are the Git GUI maintainer, and this was your suggestion,
I made it so.
Ciao,
Johannes
> > We could either maintain a blacklist, for what we cache the result
> > too, or always call "git rev-parse --git-dir".
> >
> > This blacklist would need to be in sync with the one in Git's
> > path.c::adjust_git_path() than.
>
> Is caching GIT_DIR that important in terms of performance? Otherwise,
> I'd say calling `git rev-parse --git-path` for _every_ subdirectory of
> GIT_DIR is a much simpler solution.
>
> --
> Regards,
> Pratyush Yadav
>
next prev parent reply other threads:[~2019-09-30 9:42 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-26 21:17 [PATCH 0/1] git-gui: respect core.hooksPath, falling back to .git/hooks Johannes Schindelin via GitGitGadget
2019-09-26 21:17 ` [PATCH 1/1] " Johannes Schindelin via GitGitGadget
2019-09-26 22:36 ` Pratyush Yadav
2019-09-27 6:10 ` Bert Wesarg
2019-09-27 13:05 ` Pratyush Yadav
2019-09-30 9:42 ` Johannes Schindelin [this message]
2019-10-01 13:31 ` Pratyush Yadav
2019-10-01 17:38 ` Johannes Schindelin
2019-10-04 16:48 ` Pratyush Yadav
2019-10-04 19:56 ` Johannes Schindelin
2019-09-30 9:45 ` [PATCH v2 0/1] git-gui: " Johannes Schindelin via GitGitGadget
2019-09-30 9:45 ` [PATCH v2 1/1] " Johannes Schindelin via GitGitGadget
2019-10-04 21:41 ` [PATCH v3 0/1] git-gui: " Johannes Schindelin via GitGitGadget
2019-10-04 21:41 ` [PATCH v3 1/1] Fix gitdir e.g. to respect core.hooksPath Johannes Schindelin via GitGitGadget
2019-10-08 0:29 ` Pratyush Yadav
2019-10-08 11:30 ` Johannes Schindelin
2019-10-08 11:33 ` [PATCH v4 0/1] git-gui: respect core.hooksPath, falling back to .git/hooks Johannes Schindelin via GitGitGadget
2019-10-08 11:33 ` [PATCH v4 1/1] Make gitdir work with worktrees, respect core.hooksPath, etc Johannes Schindelin via GitGitGadget
2019-10-11 22:26 ` Pratyush Yadav
2019-10-12 21:24 ` Johannes Schindelin
2019-10-13 18:55 ` Pratyush Yadav
2019-10-13 22:18 ` Johannes Schindelin
2019-10-17 18:34 ` Pratyush Yadav
2019-10-14 8:14 ` Johannes Schindelin
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