$ git clone -n https://src.fedoraproject.org/rpms/kf5-messagelib.git /var/lib/mock/f39-build-1970383-43320/root/chroot_tmpdir/scmroot/kf5-messagelib
Cloning into '/var/lib/mock/f39-build-1970383-43320/root/chroot_tmpdir/scmroot/kf5-messagelib'...
$ git fetch origin f6cf7d12240d1f0003119ce2944d793994a25f34:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-messagelib
 * [new ref]         f6cf7d12240d1f0003119ce2944d793994a25f34 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f6cf7d1 23.08.3