$ git clone -n https://src.fedoraproject.org/rpms/ghc-Stream.git /var/lib/mock/f45-build-9941-411/root/chroot_tmpdir/scmroot/ghc-Stream
Cloning into '/var/lib/mock/f45-build-9941-411/root/chroot_tmpdir/scmroot/ghc-Stream'...
$ git fetch origin 3485074ff613c393b50a3e2d72043e69cb63a347:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-Stream
 * [new ref]         3485074ff613c393b50a3e2d72043e69cb63a347 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3485074 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild