$ git clone -n https://src.fedoraproject.org/rpms/golang-github-mattn-gtk.git /var/lib/mock/f38-build-side-42-init-devel-952335-28780/root/chroot_tmpdir/scmroot/golang-github-mattn-gtk
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-952335-28780/root/chroot_tmpdir/scmroot/golang-github-mattn-gtk'...
$ git fetch origin 85d1b14072c76c0e9ccc54e00b988024e4d33172:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-mattn-gtk
 * [new ref]         85d1b14072c76c0e9ccc54e00b988024e4d33172 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85d1b14 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild