$ git clone -n https://src.fedoraproject.org/rpms/gstream.git /var/lib/mock/f45-build-13115-446/root/chroot_tmpdir/scmroot/gstream
Cloning into '/var/lib/mock/f45-build-13115-446/root/chroot_tmpdir/scmroot/gstream'...
$ git fetch origin d5becd2242fe882b19a98dd4a53bdcd039ff7bf2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstream
 * [new ref]         d5becd2242fe882b19a98dd4a53bdcd039ff7bf2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5becd2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild