$ git clone -n https://src.fedoraproject.org/rpms/ghc-servant-options.git /var/lib/mock/f38-build-side-42-init-devel-1373270-30706/root/chroot_tmpdir/scmroot/ghc-servant-options
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1373270-30706/root/chroot_tmpdir/scmroot/ghc-servant-options'...
$ git fetch origin 8b63b41b3c60924f0b484117eaa4865f9686ac7c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-servant-options
 * [new ref]         8b63b41b3c60924f0b484117eaa4865f9686ac7c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b63b41 Convert to %autorelease and %autochangelog