$ git clone -n https://src.fedoraproject.org/rpms/plexus-build-api.git /var/lib/mock/f40-build-2134862-50815/root/chroot_tmpdir/scmroot/plexus-build-api
Cloning into '/var/lib/mock/f40-build-2134862-50815/root/chroot_tmpdir/scmroot/plexus-build-api'...
$ git fetch origin 3b0747f0c47ce7dd4ddda1d1f7b96322ab532b59:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-build-api
 * [new ref]         3b0747f0c47ce7dd4ddda1d1f7b96322ab532b59 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b0747f Update javapackages test plan to f40