$ git clone -n https://src.fedoraproject.org/rpms/ghc-microlens-ghc.git /var/lib/mock/f38-build-side-42-init-devel-807452-28233/root/chroot_tmpdir/scmroot/ghc-microlens-ghc
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-807452-28233/root/chroot_tmpdir/scmroot/ghc-microlens-ghc'...
$ git fetch origin 339cfaa3219d02fd74f880fc79be2fea18e0d94a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-microlens-ghc
 * [new ref]         339cfaa3219d02fd74f880fc79be2fea18e0d94a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 339cfaa Convert to %autorelease and %autochangelog