$ git clone -n https://src.fedoraproject.org/rpms/osgi-core.git /var/lib/mock/f42-build-3406840-45143/root/chroot_tmpdir/scmroot/osgi-core
Cloning into '/var/lib/mock/f42-build-3406840-45143/root/chroot_tmpdir/scmroot/osgi-core'...
$ git fetch origin 150387fe895c9b10c4a13f939a38013e7cdec11b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/osgi-core
 * [new ref]         150387fe895c9b10c4a13f939a38013e7cdec11b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 150387f Remove javadoc subpackage