$ git clone -n https://src.fedoraproject.org/rpms/python-multibase.git /var/lib/mock/f45-build-31588-654/root/chroot_tmpdir/scmroot/python-multibase
Cloning into '/var/lib/mock/f45-build-31588-654/root/chroot_tmpdir/scmroot/python-multibase'...
$ git fetch origin 5c385e4e7ec08bf2ac9eacc68b6bf2eddc2faad6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-multibase
 * [new ref]         5c385e4e7ec08bf2ac9eacc68b6bf2eddc2faad6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5c385e4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild