$ git clone -n https://src.fedoraproject.org/rpms/byte-buddy.git /var/lib/mock/f42-build-3354856-45022/root/chroot_tmpdir/scmroot/byte-buddy
Cloning into '/var/lib/mock/f42-build-3354856-45022/root/chroot_tmpdir/scmroot/byte-buddy'...
$ git fetch origin 69d8267e5f074ede7956c82b977d171e255bd477:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/byte-buddy
 * [new ref]         69d8267e5f074ede7956c82b977d171e255bd477 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 69d8267 Remove javadoc subpackage