$ git clone -n https://src.fedoraproject.org/rpms/java-11-openjdk-portable.git /var/lib/mock/f38-build-side-42-init-devel-1011499-29457/root/chroot_tmpdir/scmroot/java-11-openjdk-portable
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1011499-29457/root/chroot_tmpdir/scmroot/java-11-openjdk-portable'...
$ git fetch origin 62e006c4ff753226b9c609c8d0411a6e49fdacf0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/java-11-openjdk-portable
 * [new ref]         62e006c4ff753226b9c609c8d0411a6e49fdacf0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62e006c introduced archfull src archive