$ git clone -n https://src.fedoraproject.org/rpms/python-pem.git /var/lib/mock/f45-build-31931-656/root/chroot_tmpdir/scmroot/python-pem
Cloning into '/var/lib/mock/f45-build-31931-656/root/chroot_tmpdir/scmroot/python-pem'...
$ git fetch origin c42fd5b693fc71bd4c9c8b632addc73fe3c7e92b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pem
 * [new ref]         c42fd5b693fc71bd4c9c8b632addc73fe3c7e92b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c42fd5b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild