$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rugged.git /var/lib/mock/f45-build-35280-694/root/chroot_tmpdir/scmroot/rubygem-rugged
Cloning into '/var/lib/mock/f45-build-35280-694/root/chroot_tmpdir/scmroot/rubygem-rugged'...
$ git fetch origin 7b34edd7562bf5406e5c79b326f31d2420477f94:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rugged
 * [new ref]         7b34edd7562bf5406e5c79b326f31d2420477f94 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b34edd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild