$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-transgrp.git /var/lib/mock/f40-build-2722004-73090/root/chroot_tmpdir/scmroot/gap-pkg-transgrp
Cloning into '/var/lib/mock/f40-build-2722004-73090/root/chroot_tmpdir/scmroot/gap-pkg-transgrp'...
$ git fetch origin e26ffd35bdbe9d2730765abc18134b9d825ab4d4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-transgrp
 * [new ref]         e26ffd35bdbe9d2730765abc18134b9d825ab4d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e26ffd3 Rebuild for gap 4.13.0