$ git clone -n https://src.fedoraproject.org/rpms/python-pyface.git /var/lib/mock/f39-build-1917012-42924/root/chroot_tmpdir/scmroot/python-pyface
Cloning into '/var/lib/mock/f39-build-1917012-42924/root/chroot_tmpdir/scmroot/python-pyface'...
$ git fetch origin b7ea624862f89e27d84b37e76d9af66b859f7a9d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pyface
 * [new ref]         b7ea624862f89e27d84b37e76d9af66b859f7a9d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b7ea624 Disable bootstrap