$ git clone -n https://src.fedoraproject.org/rpms/ghc-nanospec.git /var/lib/mock/f38-build-side-42-init-devel-847268-28422/root/chroot_tmpdir/scmroot/ghc-nanospec
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-847268-28422/root/chroot_tmpdir/scmroot/ghc-nanospec'...
$ git fetch origin 5fba63f7bd8451d06ae8803194e8e0bb3ed6eb3e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-nanospec
 * [new ref]         5fba63f7bd8451d06ae8803194e8e0bb3ed6eb3e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5fba63f Convert to %autorelease and %autochangelog