$ git clone -n https://src.fedoraproject.org/rpms/alienblaster.git /var/lib/mock/f41-build-797369-13658/root/chroot_tmpdir/scmroot/alienblaster
Cloning into '/var/lib/mock/f41-build-797369-13658/root/chroot_tmpdir/scmroot/alienblaster'...
$ git fetch origin f810230ce34815b33c58f39bf14fecd74b869ca3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/alienblaster
 * [new ref]         f810230ce34815b33c58f39bf14fecd74b869ca3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f810230 Eliminate use of obsolete %patchN syntax (#2283636)