$ git clone -n https://src.fedoraproject.org/rpms/vavoom.git /var/lib/mock/f41-build-1033730-18591/root/chroot_tmpdir/scmroot/vavoom
Cloning into '/var/lib/mock/f41-build-1033730-18591/root/chroot_tmpdir/scmroot/vavoom'...
$ git fetch origin ea93dda5ceb67562a3a905286be9863cb98ff48d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vavoom
 * [new ref]         ea93dda5ceb67562a3a905286be9863cb98ff48d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea93dda Eliminate use of obsolete %patchN syntax (#2283636)