$ git clone -n https://src.fedoraproject.org/rpms/apache-commons-lang3.git /var/lib/mock/f42-build-3356277-45027/root/chroot_tmpdir/scmroot/apache-commons-lang3
Cloning into '/var/lib/mock/f42-build-3356277-45027/root/chroot_tmpdir/scmroot/apache-commons-lang3'...
$ git fetch origin c64e27a7f56ecd39e084a10a88de08859a19038e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/apache-commons-lang3
 * [new ref]         c64e27a7f56ecd39e084a10a88de08859a19038e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c64e27a Remove javadoc subpackage