$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Stream.git /var/lib/mock/f45-build-26858-619/root/chroot_tmpdir/scmroot/perl-Test-Stream
Cloning into '/var/lib/mock/f45-build-26858-619/root/chroot_tmpdir/scmroot/perl-Test-Stream'...
$ git fetch origin eee6b1cfcd16ab90c0a5faa949a07b2a830a6c74:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Stream
 * [new ref]         eee6b1cfcd16ab90c0a5faa949a07b2a830a6c74 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eee6b1c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild