$ git clone -n https://src.fedoraproject.org/rpms/python-stestr.git /var/lib/mock/f45-build-33233-667/root/chroot_tmpdir/scmroot/python-stestr
Cloning into '/var/lib/mock/f45-build-33233-667/root/chroot_tmpdir/scmroot/python-stestr'...
$ git fetch origin 8a76110655cb1b19d077aadfffa917b56fbfbbaf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-stestr
 * [new ref]         8a76110655cb1b19d077aadfffa917b56fbfbbaf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8a76110 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild