threads / discuss / 60555

Running git(1) from within hooks/post-update

Subject: Running git(1) from within hooks/post-update

## tl;dr

3 messages between Nov 24, 2023 and Nov 24, 2023.

replies: 2people: 1as markdown or json

Alejandro Colomar· Nov 24, 2023, 14:00 UTC · lore

Hi,

I'm trying to set up a post-update hook to produce a build of the Linux man-pages PDF book after every push to my personal server to the 'main' branch, so that I can serve man-pages-HEAD.pdf at some URL, for users to be able to easily check the manual at git HEAD without having to clone the repo.

I thought of having a git non-bare repo where I build it, so the script would be the following (the paths are tmp, because I'm still testing).

	$ cat post-update 
	#!/bin/sh

	test "$1" = "refs/heads/main" || exit 0;

	cd ~/tmp/man-pages/;

	whoami; pwd; ls -ld .git/;  # This is for debugging.

	git fetch srv			#>/dev/null 2>&1;
	git reset srv/main --hard	#>/dev/null 2>&1;
	git clean -dffx			#>/dev/null 2>&1;
	scripts/LinuxManBook/build.sh	>~/tmp/LMB-HEAD.pdf &

But it's not working. The git(1) calls are failing, saying it's not a git repo, but it clearly is, and I have permissions, so I don't understand what's going wrong. Here's the 'remote:' output of a push to that testing server:

	remote: alx
	remote: /home/alx/tmp/man-pages
	remote: drwxr-xr-x 8 alx alx 4096 Nov 24 14:41 .git/
	remote: fatal: not a git repository: '.'
	remote: fatal: not a git repository: '.'
	remote: fatal: not a git repository: '.'
	remote: hooks/post-update: 12: ./scripts/LinuxManBook/build.sh: not found

Can you please help?  :)

Thanks, Alex

-- 
<https://www.alejandro-colomar.es/>

Alejandro Colomar· Nov 24, 2023, 15:42 UTC · re: Alejandro Colomar · lore

Re: Running git(1) from within hooks/post-update

On Fri, Nov 24, 2023 at 03:00:22PM +0100, Alejandro Colomar wrote:

Show 24 quoted lines

> Hi,
> 
> I'm trying to set up a post-update hook to produce a build of the Linux
> man-pages PDF book after every push to my personal server to the 'main'
> branch, so that I can serve man-pages-HEAD.pdf at some URL, for users to
> be able to easily check the manual at git HEAD without having to clone
> the repo.
> 
> I thought of having a git non-bare repo where I build it, so the script
> would be the following (the paths are tmp, because I'm still testing).
> 
> 	$ cat post-update 
> 	#!/bin/sh
> 
> 	test "$1" = "refs/heads/main" || exit 0;
> 
> 	cd ~/tmp/man-pages/;
> 
> 	whoami; pwd; ls -ld .git/;  # This is for debugging.
> 
> 	git fetch srv			#>/dev/null 2>&1;
> 	git reset srv/main --hard	#>/dev/null 2>&1;
> 	git clean -dffx			#>/dev/null 2>&1;
> 	scripts/LinuxManBook/build.sh	>~/tmp/LMB-HEAD.pdf &

The script works fine when called manually. It seems it's calling it as a hook that fails. It seems it's running git(1) from within a post-update hook that is problematic. Is that expected, or is it a bug, and can it be fixed?

Show 21 quoted lines

> 
> But it's not working.  The git(1) calls are failing, saying it's not a
> git repo, but it clearly is, and I have permissions, so I don't
> understand what's going wrong.  Here's the 'remote:' output of a push to
> that testing server:
> 
> 	remote: alx
> 	remote: /home/alx/tmp/man-pages
> 	remote: drwxr-xr-x 8 alx alx 4096 Nov 24 14:41 .git/
> 	remote: fatal: not a git repository: '.'
> 	remote: fatal: not a git repository: '.'
> 	remote: fatal: not a git repository: '.'
> 	remote: hooks/post-update: 12: ./scripts/LinuxManBook/build.sh: not found
> 
> Can you please help?  :)
> 
> Thanks,
> Alex
> 
> -- 
> <https://www.alejandro-colomar.es/>

-- 
<https://www.alejandro-colomar.es/>

Alejandro Colomar· Nov 24, 2023, 15:49 UTC · re: Alejandro Colomar · lore

Re: Running git(1) from within hooks/post-update

On Fri, Nov 24, 2023 at 04:42:16PM +0100, Alejandro Colomar wrote:

Show 30 quoted lines

> On Fri, Nov 24, 2023 at 03:00:22PM +0100, Alejandro Colomar wrote:
> > Hi,
> > 
> > I'm trying to set up a post-update hook to produce a build of the Linux
> > man-pages PDF book after every push to my personal server to the 'main'
> > branch, so that I can serve man-pages-HEAD.pdf at some URL, for users to
> > be able to easily check the manual at git HEAD without having to clone
> > the repo.
> > 
> > I thought of having a git non-bare repo where I build it, so the script
> > would be the following (the paths are tmp, because I'm still testing).
> > 
> > 	$ cat post-update 
> > 	#!/bin/sh
> > 
> > 	test "$1" = "refs/heads/main" || exit 0;
> > 
> > 	cd ~/tmp/man-pages/;
> > 
> > 	whoami; pwd; ls -ld .git/;  # This is for debugging.
> > 
> > 	git fetch srv			#>/dev/null 2>&1;
> > 	git reset srv/main --hard	#>/dev/null 2>&1;
> > 	git clean -dffx			#>/dev/null 2>&1;
> > 	scripts/LinuxManBook/build.sh	>~/tmp/LMB-HEAD.pdf &
> 
> The script works fine when called manually.  It seems it's calling it
> as a hook that fails.  It seems it's running git(1) from within a
> post-update hook that is problematic.  Is that expected, or is it a bug,
> and can it be fixed?

Ahh, after this I've found it documented in githooks(5):

     Environment variables, such as GIT_DIR, GIT_WORK_TREE, etc., are
     exported so that Git commands run by the hook can correctly
     locate the repository. If your hook needs to invoke Git commands
     in a foreign repository or in a different working tree of the
     same repository, then it should clear these environment variables
     so they do not interfere with Git operations at the foreign
     location. For example:

         local_desc=$(git describe)
         foreign_desc=$(unset $(git rev-parse --local-env-vars); git -C ../foreign-repo describe)

Never mind.

Thanks, Alex

Show 27 quoted lines

> 
> > 
> > But it's not working.  The git(1) calls are failing, saying it's not a
> > git repo, but it clearly is, and I have permissions, so I don't
> > understand what's going wrong.  Here's the 'remote:' output of a push to
> > that testing server:
> > 
> > 	remote: alx
> > 	remote: /home/alx/tmp/man-pages
> > 	remote: drwxr-xr-x 8 alx alx 4096 Nov 24 14:41 .git/
> > 	remote: fatal: not a git repository: '.'
> > 	remote: fatal: not a git repository: '.'
> > 	remote: fatal: not a git repository: '.'
> > 	remote: hooks/post-update: 12: ./scripts/LinuxManBook/build.sh: not found
> > 
> > Can you please help?  :)
> > 
> > Thanks,
> > Alex
> > 
> > -- 
> > <https://www.alejandro-colomar.es/>
> 
> 
> 
> -- 
> <https://www.alejandro-colomar.es/>

-- 
<https://www.alejandro-colomar.es/>