script to retrieve airgap images from running cluster (#120)

* script to retrieve airgap images from running cluster

* add airgap scripts based on PR #120

---------

Co-authored-by: Alberto Morgante Medina <alberto.morgante@suse.com>

Author: dprodanov4

airgap-images/README.md

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+# Airgap images 
+
+There are two types of airgap images:
+
+- Rancher images
+
+- EIB images for the mgmt-cluster 
+
+## Requirements
+
+To retrieve the airgap images, you need to have the following tools installed:
+
+- helm `curl https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash`
+
+**IMPORTANT**: You need to run the following scripts in a cluster deployed with the final versions (the release you want to retrieve the airgap images list)
+
+
+## Airgap images for the management cluster
+
+The airgap images for the management cluster are located in the `airgap-images` directory. The images are used to create a management cluster that is not connected to the internet. The images are stored in a tar file and can be loaded into the local container registry using the following command:
+
+```bash
+./eib-mgmt-cluster-airgap-images.sh
+```
+
+This command will show you the full list images to be included in the EIB definition file for airgap scenarios
+
+
+## Airgap images for rancher guide
+
+``` 
+./retrieve-rancher-airgap-images.sh
+```
+
+This will show you the list of images to be included in the rancher guide for airgap environments

airgap-images/eib-mgmt-cluster-airgap-images.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+kubectl get pods --all-namespaces -o jsonpath="{..image}" | tr -s '[[:space:]]' '\n' | sort | uniq

airgap-images/retrieve-airgap-images.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+# CONFIGURATION ———
+WORKDIR="./hauler_temp"
+mkdir -p "${WORKDIR}"
+
+# Add & update the Prime Helm repo
+helm repo add rancher-prime https://charts.rancher.com/server-charts/prime
+helm repo update
+
+# Auto-detect Rancher version from your cluster (fallback to Helm)
+if RANCHER_IMAGE=$(kubectl -n cattle-system get deployment rancher \
+    -o jsonpath='{.spec.template.spec.containers[0].image}' 2>/dev/null); then
+  RANCHER_VERSION="${RANCHER_IMAGE##*:}"
+  echo "Detected Rancher image in cluster: ${RANCHER_IMAGE}"
+  echo "Using Rancher version: ${RANCHER_VERSION}"
+else
+  echo "Could not detect Rancher in cattle-system, falling back to Helm query"
+  RANCHER_VERSION=$(helm search repo rancher-prime/rancher \
+    | awk 'NR==2 {print $3}')
+  echo "Using Rancher GitHub release tag: ${RANCHER_VERSION}"
+fi
+
+# Download & fail if the tag doesn’t exist
+PRIME_BASE="https://prime.ribs.rancher.io/rancher/${RANCHER_VERSION}"
+curl -fSL "${PRIME_BASE}/rancher-images.txt" \
+  -o "${WORKDIR}/orig-rancher-images.txt" \
+|| {
+  echo >&2 "ERROR: Rancher Prime release ${RANCHER_VERSION} not found at ${PRIME_BASE}"
+  exit 1
+}
+
+# Filter out unneeded images
+sed -E '/neuvector|minio|gke|aks|eks|sriov|harvester|mirrored|longhorn|thanos|tekton|istio|hyper|jenkins|windows/d' \
+  "${WORKDIR}/orig-rancher-images.txt" \
+  > "${WORKDIR}/cleaned-rancher-images.txt"
+
+# Re-add Cluster API and kubectl entries
+grep cluster-api "${WORKDIR}/orig-rancher-images.txt" >> "${WORKDIR}/cleaned-rancher-images.txt"
+grep kubectl      "${WORKDIR}/orig-rancher-images.txt" >> "${WORKDIR}/cleaned-rancher-images.txt"
+
+# ——— 5. Pick the latest tag for each repo ———
+> "${WORKDIR}/rancher-unsorted.txt"
+awk -F: '{print $1}' "${WORKDIR}/cleaned-rancher-images.txt" | sort -u |
+while read -r repo; do
+  grep -w "$repo" "${WORKDIR}/cleaned-rancher-images.txt" \
+    | sort -Vr | head -1 \
+    >> "${WORKDIR}/rancher-unsorted.txt"
+done
+
+# Final sort & dedupe
+sort -u "${WORKDIR}/rancher-unsorted.txt" > "${WORKDIR}/rancher-images.txt"
+
+# Manual fix-ups
+{
+  echo "rancher/kubectl:v1.20.2"
+  echo "rancher/shell:v0.1.24"
+  grep mirrored-ingress-nginx "${WORKDIR}/orig-rancher-images.txt"
+} >> "${WORKDIR}/rancher-images.txt"
+
+# Generate airgap_hauler.yaml
+cat > airgap_hauler.yaml <<EOF
+images:
+EOF
+while read -r img; do
+  echo "  - name: ${img}"
+done < "${WORKDIR}/rancher-images.txt" >> airgap_hauler.yaml
+
+echo "  • ${WORKDIR}/rancher-images.txt"
+echo "  • airgap_hauler.yaml"