$ git clone -n https://src.fedoraproject.org/rpms/alienblaster.git /var/lib/mock/f41-build-side-1-2631550-25718/root/chroot_tmpdir/scmroot/alienblaster
Cloning into '/var/lib/mock/f41-build-side-1-2631550-25718/root/chroot_tmpdir/scmroot/alienblaster'...
$ git fetch origin 3f445570bee2f2424882cac68f9e5f1a04d876e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/alienblaster
 * [new ref]         3f445570bee2f2424882cac68f9e5f1a04d876e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3f44557 convert GPLv2+ license to SPDX