$ git clone -n https://src.fedoraproject.org/rpms/alliance.git /var/lib/mock/f41-build-1034202-18618/root/chroot_tmpdir/scmroot/alliance
Cloning into '/var/lib/mock/f41-build-1034202-18618/root/chroot_tmpdir/scmroot/alliance'...
$ git fetch origin 1af86afdc729752466579587c34a4a5669892ec2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/alliance
 * [new ref]         1af86afdc729752466579587c34a4a5669892ec2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1af86af Eliminate use of obsolete %patchN syntax (#2283636)