$ git clone -n https://src.fedoraproject.org/rpms/keydb.git /var/lib/mock/f45-build-14729-463/root/chroot_tmpdir/scmroot/keydb
Cloning into '/var/lib/mock/f45-build-14729-463/root/chroot_tmpdir/scmroot/keydb'...
$ git fetch origin 398bf94c46adbe3cbec4fb751f6a4ee22c2ed0db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/keydb
 * [new ref]         398bf94c46adbe3cbec4fb751f6a4ee22c2ed0db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 398bf94 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild