$ git clone -n https://src.fedoraproject.org/rpms/ghc-rfc5051.git /var/lib/mock/f38-build-side-42-init-devel-908665-28677/root/chroot_tmpdir/scmroot/ghc-rfc5051
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-908665-28677/root/chroot_tmpdir/scmroot/ghc-rfc5051'...
$ git fetch origin d727cad719584a6d0ba51d8211e8b7b4ba5d72aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-rfc5051
 * [new ref]         d727cad719584a6d0ba51d8211e8b7b4ba5d72aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d727cad Convert to %autorelease and %autochangelog