$ git clone -n https://src.fedoraproject.org/rpms/cstream.git /var/lib/mock/f45-build-5469-339/root/chroot_tmpdir/scmroot/cstream
Cloning into '/var/lib/mock/f45-build-5469-339/root/chroot_tmpdir/scmroot/cstream'...
$ git fetch origin 2b79a1006fcb7dcba8d4961711f926e421fb0a80:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cstream
 * [new ref]         2b79a1006fcb7dcba8d4961711f926e421fb0a80 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2b79a10 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild