$ git clone -n https://src.fedoraproject.org/rpms/ghc-data-default-instances-dlist.git /var/lib/mock/f40-build-2117857-50725/root/chroot_tmpdir/scmroot/ghc-data-default-instances-dlist
Cloning into '/var/lib/mock/f40-build-2117857-50725/root/chroot_tmpdir/scmroot/ghc-data-default-instances-dlist'...
$ git fetch origin 0051ba637bcca2c8fb01a5d389f4179e836f8206:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-data-default-instances-dlist
 * [new ref]         0051ba637bcca2c8fb01a5d389f4179e836f8206 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0051ba6 bump release