$ git clone -n https://src.fedoraproject.org/rpms/python-cfgv.git /var/lib/mock/f45-build-29887-641/root/chroot_tmpdir/scmroot/python-cfgv
Cloning into '/var/lib/mock/f45-build-29887-641/root/chroot_tmpdir/scmroot/python-cfgv'...
$ git fetch origin 5ac640d01b4df54730004fb2e0701f67fc0900a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-cfgv
 * [new ref]         5ac640d01b4df54730004fb2e0701f67fc0900a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ac640d Simplify .gitignore