$ git clone -n https://src.fedoraproject.org/rpms/python-pebble.git /var/lib/mock/f45-build-31979-656/root/chroot_tmpdir/scmroot/python-pebble
Cloning into '/var/lib/mock/f45-build-31979-656/root/chroot_tmpdir/scmroot/python-pebble'...
$ git fetch origin 1236c27cc0bfd8ff231f3fc93b4c502445866352:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pebble
 * [new ref]         1236c27cc0bfd8ff231f3fc93b4c502445866352 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1236c27 Update to 5.2.1 upstream release