$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-genss.git /var/lib/mock/f40-build-2590709-62633/root/chroot_tmpdir/scmroot/gap-pkg-genss
Cloning into '/var/lib/mock/f40-build-2590709-62633/root/chroot_tmpdir/scmroot/gap-pkg-genss'...
$ git fetch origin c5f04c4adb49065220c225fe83cfcd2c488c1d15:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-genss
 * [new ref]         c5f04c4adb49065220c225fe83cfcd2c488c1d15 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c5f04c4 Rebuild for gap 4.13.0