$ git clone -n https://src.fedoraproject.org/rpms/ghc-auto-update.git /var/lib/mock/f40-build-2211938-52247/root/chroot_tmpdir/scmroot/ghc-auto-update
Cloning into '/var/lib/mock/f40-build-2211938-52247/root/chroot_tmpdir/scmroot/ghc-auto-update'...
$ git fetch origin ec761ab6cd4351ebdf5f576ca9446589c4b0efb3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-auto-update
 * [new ref]         ec761ab6cd4351ebdf5f576ca9446589c4b0efb3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ec761ab bump release