$ git clone -n https://src.fedoraproject.org/rpms/gitweb-caching.git /var/lib/mock/f41-build-1200345-22413/root/chroot_tmpdir/scmroot/gitweb-caching
Cloning into '/var/lib/mock/f41-build-1200345-22413/root/chroot_tmpdir/scmroot/gitweb-caching'...
$ git fetch origin 5e908eefbf33ce0ee7d2240aed45c899913830ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gitweb-caching
 * [new ref]         5e908eefbf33ce0ee7d2240aed45c899913830ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5e908ee Eliminate use of obsolete %patchN syntax (#2283636)