$ git clone -n https://github.com/xcp-ng-rpms/emulex-lpfc-alt.git /var/lib/mock/v8.3-incoming-10807-29319/root/chroot_tmpdir/scmroot/emulex-lpfc-alt
Cloning into '/var/lib/mock/v8.3-incoming-10807-29319/root/chroot_tmpdir/scmroot/emulex-lpfc-alt'...
$ git fetch origin 1254493c0e51bee569a5a6b3eeb591fa478489b4:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/emulex-lpfc-alt
 * [new ref]         1254493c0e51bee569a5a6b3eeb591fa478489b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1254493 Import emulex-lpfc-14.4.393.31-1.xs8.src.rpm