$ git clone -n https://src.fedoraproject.org/rpms/ghc-haskell-src-meta.git /var/lib/mock/f45-build-10376-416/root/chroot_tmpdir/scmroot/ghc-haskell-src-meta
Cloning into '/var/lib/mock/f45-build-10376-416/root/chroot_tmpdir/scmroot/ghc-haskell-src-meta'...
$ git fetch origin 4c79d8f68ff65bc948f44138a101e353fb3c9e5b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-haskell-src-meta
 * [new ref]         4c79d8f68ff65bc948f44138a101e353fb3c9e5b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c79d8f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild