$ git clone -n https://src.fedoraproject.org/rpms/ghc-language-ecmascript.git /var/lib/mock/f38-build-side-42-init-devel-650939-26477/root/chroot_tmpdir/scmroot/ghc-language-ecmascript
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-650939-26477/root/chroot_tmpdir/scmroot/ghc-language-ecmascript'...
$ git fetch origin 7b855d88436e21b1d9b6fa853e029acf5ae8d653:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-language-ecmascript
 * [new ref]         7b855d88436e21b1d9b6fa853e029acf5ae8d653 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b855d8 set %autorelease baserelease for upgrade from f37