$ git clone -n https://src.fedoraproject.org/rpms/ghc-filestore.git /var/lib/mock/f39-build-1507465-35262/root/chroot_tmpdir/scmroot/ghc-filestore
Cloning into '/var/lib/mock/f39-build-1507465-35262/root/chroot_tmpdir/scmroot/ghc-filestore'...
$ git fetch origin 3ee63c06a9a865ca5d0b5249f45e02c351e99dcc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-filestore
 * [new ref]         3ee63c06a9a865ca5d0b5249f45e02c351e99dcc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ee63c0 bump release