$ git clone -n https://src.fedoraproject.org/rpms/jabberd.git /var/lib/mock/f41-build-785990-13590/root/chroot_tmpdir/scmroot/jabberd
Cloning into '/var/lib/mock/f41-build-785990-13590/root/chroot_tmpdir/scmroot/jabberd'...
$ git fetch origin 2d9fb351f3fe2346fa3cf083d22987015bbfead6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jabberd
 * [new ref]         2d9fb351f3fe2346fa3cf083d22987015bbfead6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2d9fb35 Eliminate use of obsolete %patchN syntax (#2283636)