Add Docker File and script for creating CNV image

rdr/container_image/cnv/Dockerfile

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+FROM scratch
+ADD disk.qcow2 /disk/disk.qcow2

rdr/container_image/cnv/build.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+# ================= CONFIG =================
+IMAGE="quay.io/ocsci/cirros-dd"
+VERSION="0.6.3"
+BASE_URL="https://download.cirros-cloud.net/${VERSION}"
+
+# CirrOS-supported disk images
+declare -A ARCH_MAP=(
+  [amd64]="cirros-0.6.3-x86_64-disk.img linux/amd64"
+  [arm64]="cirros-0.6.3-aarch64-disk.img linux/arm64"
+  [arm]="cirros-0.6.3-arm-disk.img linux/arm/v7"
+  [ppc64le]="cirros-0.6.3-ppc64le-disk.img linux/ppc64le"
+)
+
+# ================= CLEANUP =================
+cleanup() {
+  sudo umount /mnt 2>/dev/null || true
+  sudo qemu-nbd --disconnect /dev/nbd0 2>/dev/null || true
+}
+trap cleanup EXIT
+
+# ================= PREP =================
+sudo modprobe nbd max_part=8
+
+# ================= BUILD LOOP =================
+for ARCH in "${!ARCH_MAP[@]}"; do
+  read -r DISK PLATFORM <<< "${ARCH_MAP[$ARCH]}"
+  OCI_ARCH="${PLATFORM#linux/}"
+
+  echo "▶ Building for ${ARCH} (${PLATFORM})"
+
+  # ---------- Download disk ----------
+  curl -fL -O "${BASE_URL}/${DISK}"
+
+  # ---------- Inject init script ----------
+  sudo qemu-nbd --connect=/dev/nbd0 "$DISK"
+  sleep 2
+  sudo mount /dev/nbd0p1 /mnt
+
+  sudo mkdir -p /mnt/usr/local/bin
+  sudo cp io_dd_verify.sh /mnt/usr/local/bin/io_dd_verify.sh
+  sudo chmod +x /mnt/usr/local/bin/io_dd_verify.sh
+
+  # Create rc.local (BusyBox init)
+  sudo mkdir -p /mnt/etc
+  sudo sh -c 'cat > /mnt/etc/rc.local <<EOF
+#!/bin/sh
+/usr/local/bin/io_dd_verify.sh &
+EOF'
+  sudo chmod +x /mnt/etc/rc.local
+
+  sudo umount /mnt
+  sudo qemu-nbd --disconnect /dev/nbd0
+
+  # ---------- Build containerDisk image (Buildah) ----------
+  CTR=$(buildah from --arch "${OCI_ARCH}" scratch)
+  buildah copy "${CTR}" "${DISK}" /disk/disk.qcow2
+  buildah config \
+    --label org.opencontainers.image.title="CirrOS dd integrity VM" \
+    --label org.opencontainers.image.version="${VERSION}" \
+    --label org.opencontainers.image.arch="${ARCH}" \
+    "${CTR}"
+
+  buildah commit "${CTR}" "${IMAGE}:${VERSION}-${ARCH}"
+  buildah rm "${CTR}"
+
+  # ---------- Push per-arch image ----------
+  buildah push "${IMAGE}:${VERSION}-${ARCH}"
+
+  rm -f "${DISK}"
+done
+
+# ================= MANIFEST =================
+echo "▶ Creating multi-arch manifest"
+
+buildah manifest create "${IMAGE}:${VERSION}" || true
+
+for ARCH in "${!ARCH_MAP[@]}"; do
+  buildah manifest add \
+    "${IMAGE}:${VERSION}" \
+    "docker://${IMAGE}:${VERSION}-${ARCH}"
+done
+
+buildah manifest push --all \
+  "${IMAGE}:${VERSION}" \
+  "docker://${IMAGE}:${VERSION}"
+
+echo "✅ Multi-arch image published: ${IMAGE}:${VERSION}"

rdr/container_image/cnv/io_dd_verify.sh

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+#!/bin/sh
+#
+# Continuous dd I/O with integrity verification across VM restarts
+# Designed for CirrOS (BusyBox init)
+#
+
+MOUNT="/run_io"
+HASHFILE="$MOUNT/checksums.md5"
+LOGFILE="$MOUNT/script.log"
+
+mkdir -p "$MOUNT"
+
+log() {
+    ts=$(date '+%Y-%m-%dT%H:%M:%S%z')
+    printf "%s [INFO] %s\n" "$ts" "$*" | tee -a "$LOGFILE"
+}
+
+cleanup() {
+    log "Received termination signal, syncing and exiting"
+    sync
+    exit 0
+}
+
+trap cleanup SIGINT SIGTERM
+
+hostname=$(hostname 2>/dev/null || echo unknown)
+
+log "===== VM boot detected ====="
+log "Hostname: $hostname"
+
+if [ -f "$HASHFILE" ]; then
+    log "Verifying existing data"
+    if md5sum -c "$HASHFILE" >>"$LOGFILE" 2>&1; then
+        log "Integrity check PASSED"
+    else
+        log "Integrity check FAILED"
+    fi
+else
+    log "No checksum file found, starting fresh"
+fi
+
+while true; do
+    file="$MOUNT/data_$(date +%s)_${hostname}"
+
+    log "Writing file: $file"
+
+    dd if=/dev/urandom of="$file" \
+       bs=4k \
+       count=$((RANDOM % 8 + 1)) \
+       oflag=direct \
+       >>"$LOGFILE" 2>&1
+
+    rc=$?
+    if [ "$rc" -ne 0 ]; then
+        log "dd failed (rc=$rc), removing partial file"
+        rm -f "$file"
+        sync
+        sleep 1
+        continue
+    fi
+
+    md5sum "$file" >>"$HASHFILE" 2>>"$LOGFILE"
+    sync
+
+    sleep $((RANDOM % 10 + 1))
+done