$ git clone -n https://src.fedoraproject.org/rpms/rubygem-gtk2.git /var/lib/mock/f38-build-715218-95343/root/chroot_tmpdir/scmroot/rubygem-gtk2
Cloning into '/var/lib/mock/f38-build-715218-95343/root/chroot_tmpdir/scmroot/rubygem-gtk2'...
$ git fetch origin c5c0e07786bde51e2c3614ce3bcace315c58a98b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-gtk2
 * [new ref]         c5c0e07786bde51e2c3614ce3bcace315c58a98b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c5c0e07 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild