$ git clone -n https://src.fedoraproject.org/rpms/ghc.git /var/lib/mock/f45-build-46532-843/root/chroot_tmpdir/scmroot/ghc
Cloning into '/var/lib/mock/f45-build-46532-843/root/chroot_tmpdir/scmroot/ghc'...
$ git fetch origin d94e4bbe50ccb5fab85fcc621754cba8b9d19264:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc
 * [new ref]         d94e4bbe50ccb5fab85fcc621754cba8b9d19264 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d94e4bb fix build with sphinx9 (sterni)