Prepare cloud-init iso file to be able to initialize VMs with various distributions for automated tests

distro-tests/cloud-init/create-cloud-init-iso.sh

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+#!/bin/sh
+# SPDX-License-Identifier: MIT
+set -eu
+
+# How to do it is documented on https://cloudinit.readthedocs.io/en/latest/howto/launch_qemu.html
+
+
+ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+PREPARED_DIR="${ROOT_DIR}/prepared"
+IDENTITY_DIR="${PREPARED_DIR}/identity"
+TMP_DIR="${ROOT_DIR}/tmp"
+
+KEY_PRIV="${IDENTITY_DIR}/ssh_ed25519"
+KEY_PUB="${IDENTITY_DIR}/ssh_ed25519.pub"
+
+USER_DATA_SRC="${ROOT_DIR}/cloud-init/template/user-data.tmpl"
+META_DATA_SRC="${ROOT_DIR}/cloud-init/template/meta-data.tmpl"
+
+mkdir -p ${TMP_DIR}
+
+# --------------------------------------------------------------------
+# SSH identity (per user, stable)
+# --------------------------------------------------------------------
+if [ ! -f "${KEY_PRIV}" ]; then
+  echo "[*] Generating SSH keypair"
+  ssh-keygen -t ed25519 -N "" -f "${KEY_PRIV}" -C "distro-tests"
+else
+  echo "[*] Reusing existing SSH key"
+fi
+
+SSH_KEY="$(cat "${KEY_PUB}")"
+
+# --------------------------------------------------------------------
+# Build user-data with injected SSH key
+# --------------------------------------------------------------------
+USER_DATA_TMP="${TMP_DIR}/user-data"
+META_DATA_TMP="${TMP_DIR}/meta-data"
+
+awk -v key="${SSH_KEY}" '
+  /^users:/ { print; users=1; next }
+  users && /ssh_authorized_keys:/ {
+    print
+    print "      - " key
+    next
+  }
+  { print }
+' "${USER_DATA_SRC}" > "${USER_DATA_TMP}"
+
+cp "${META_DATA_SRC}" "${META_DATA_TMP}"
+
+# --------------------------------------------------------------------
+# Create seed ISO
+# --------------------------------------------------------------------
+echo "[*] Creating cloud-init seed.iso"
+cloud-localds \
+  "${PREPARED_DIR}/seed.iso" \
+  "${USER_DATA_TMP}" \
+  "${META_DATA_TMP}"
+
+echo "[✓] cloud-init ISO ready: ${PREPARED_DIR}/seed.iso"

distro-tests/cloud-init/template/meta-data.tmpl

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+instance-id: vuinputd-distro-tests
+local-hostname: vuinputd-distro-tests

distro-tests/cloud-init/template/user-data.tmpl

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+#cloud-config
+#
+# Shared cloud-init configuration for distro-tests
+# SSH keys are injected dynamically by create-cloud-init-iso.sh
+#
+
+users:
+  - name: testuser
+    groups: users, adm
+    shell: /bin/bash
+    sudo: ALL=(ALL) NOPASSWD:ALL
+    ssh_authorized_keys:
+
+disable_root: true
+ssh_pwauth: false
+
+package_update: false
+package_upgrade: false
+
+runcmd:
+  - echo "cloud-init bootstrap complete" > /var/tmp/cloud-init-ok