Date: Tue, 24 Nov 2020 17:33:20 +0100 From: Mathieu Arnold <mat@freebsd.org> To: Dan Langille <dan@langille.org> Cc: freebsd-git@freebsd.org Subject: Re: Monitoring commits on all branches Message-ID: <20201124163320.saytu6spw42v6fnd@aching.in.mat.cc> In-Reply-To: <EF8F4764-3C26-4BAB-9B1E-E0686A675E20@langille.org> References: <197541CC-FEA7-4B4C-936E-66A5625BB64C@langille.org> <20201119085223.nsrp2e45oyepsvds@aching.in.mat.cc> <EF8F4764-3C26-4BAB-9B1E-E0686A675E20@langille.org>
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On Thu, Nov 19, 2020 at 12:45:14PM -0500, Dan Langille wrote:
> > On Nov 19, 2020, at 3:52 AM, Mathieu Arnold <mat@FreeBSD.org> wrote:
> >=20
> > On Wed, Nov 18, 2020 at 08:49:46PM -0500, Dan Langille wrote:
> >> How can a repo be monitored for commits on all branches?
> >>=20
> >> I know how to ask a given branch: do you have any commits after foo_ha=
sh?
> >>=20
> >> How do I:
> >>=20
> >> * get a list of all commits since foo_hash
> >=20
> > All commits on the branch foo_hash is:
> >=20
> > git log $foo_hash...branch_name
>=20
> So, branch_name, not HEAD as others have mentioned?
>=20
> e.g. : git log $foo_hash..HEAD
=46rom what I understood, freshports never needs to be able to access
files on the top of a branch, it only needs to access the files on
specific commits (the fact that a commit is at the top of the branch is
only an artefact of the process). So, you never need to checkout any
branches, you only need to checkout commits. So you never have a HEAD
that points to a branch, HEAD is always in a detached state and points
to a commit.
So what you need to do is, git clone the repository, and then, each time
the script runs, do (in somewhat shell script):
#############################
NAME_OF_REMOTE=3Dorigin
NAME_OF_HEAD=3Dmain
cd /where/the/repo/is
git fetch
# get all references (so, branches, tags, and so one) and keep only
# branches (named commits here) that the remote repository has
git for-each-ref --format '%(objecttype) %(refname)' \
| sed -n 's/^commit refs\/remotes\///p'
| while read -r type refname
do
# If we don't have the tag, it means we have not encountered the
# branch yet.
if ! git tag -l freshports/$refname
then
# get the first commit of that branch and create a tag.
git tag -m "first known commit of $refname" -f freshports/$refname $(gi=
t merge-base $NAME_OF_REMOTE/$NAME_OF_HEAD $refname)
fi
# Get the list of commits between the last known one and the tip of
# the branch, list may be empty.
git rev-list freshports/$refname..$refname | while read commithash
do
# checkout that commit (with -f so that if some file got changed, we
# overwrite everything
git checkout -f $commithash
# process the commit
done
# Store the last known commit that we just processed.
git tag -m "last known commit of $refname" -f freshports/$refname $refname
done
#############################
That's all, you never need to merge or pull or whatever else.
> >=20
> >> * know which branch each of those commits was on (e.g. master, branche=
s/2020Q4)
> >=20
> > You will need to keep track of the latest commit on each branch
> > separately, because there is absolutely no relation or ordering
> > possible between branches.
>=20
> Yes, I agree. FreshPorts is keeping track of the last commit on each bran=
ch.
>=20
> Thank you.
--=20
Mathieu Arnold
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