$ git clone -n https://src.fedoraproject.org/rpms/toolshed.git /var/lib/mock/f42-build-3494555-45873/root/chroot_tmpdir/scmroot/toolshed
Cloning into '/var/lib/mock/f42-build-3494555-45873/root/chroot_tmpdir/scmroot/toolshed'...
$ git fetch origin e55de2e8fe4171b4855eb2ca5a83d4c2654a0f86:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/toolshed
 * [new ref]         e55de2e8fe4171b4855eb2ca5a83d4c2654a0f86 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e55de2e Update source snapshot from current upstream