$ git clone -n https://src.fedoraproject.org/rpms/portreserve.git /var/lib/mock/f41-build-833844-14943/root/chroot_tmpdir/scmroot/portreserve
Cloning into '/var/lib/mock/f41-build-833844-14943/root/chroot_tmpdir/scmroot/portreserve'...
$ git fetch origin b8b7c38c621e83def969433290e309089d78353f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/portreserve
 * [new ref]         b8b7c38c621e83def969433290e309089d78353f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b8b7c38 Eliminate use of obsolete %patchN syntax (#2283636)