docs: steps for adding preloaded content in custom image building

examples/custom-image/README.md

@@ -5,29 +5,62 @@ This script automates the creation of a custom image on a public cloud provider
 ## Prerequisites
 
 1. **Dependencies**
+
    - Bash (Unix/Linux environment)
    - Packer CLI (https://developer.hashicorp.com/packer/install?product_intent=packer)
 
 2. **Access and Credentials**
+
    - Ensure valid credentials for your target cloud provider.
    - For AWS, configure the `aws_access_key` and `aws_secret_key` in the configuration file i.e. custom-image-config.
    - Permissions to create and manage images for the chosen cloud provider.
 
 3. **Configuration File**
-    - **Global Configuration (`custom-image-config`)**:
+   - **Global Configuration (`custom-image-config`)**:
      Contains details about the cloud provider's credentials.
    - **Cloud-Specific Configuration (`<cloud-provider>/<os-version>.json`)**:
      Specifies the instance details for the cloud provider.
 
 ## Usage
 
 1. Prepare the Configuration Files:
-    Create the custom-image-config file in the project root directory with the required credentials.
-    Add the appropriate cloud-specific configuration file in the <cloud-provider>/ directory
+   Create the custom-image-config file in the project root directory with the required credentials.
+   Add the appropriate cloud-specific configuration file in the <cloud-provider>/ directory
 
 2. Run the Build Script: Execute the build-custom-image.sh script with the desired cloud provider:
-    ```bash
-    cd examples/custom-image
-    ./build-custom-image.sh <cloud provider>
 
-    eg: ./build-custom-image.sh aws
+   ```bash
+   cd examples/custom-image
+   ./build-custom-image.sh <cloud provider>
+
+   eg: ./build-custom-image.sh aws
+   ```
+
+## Adding default userdata
+
+1. Create `user-data` file in the `files` directory.
+2. An example of `user-data` file is as follows:
+
+```yaml
+#cloud-config
+stylus:
+  path: /var/lib/spectro
+  installationMode: airgap
+```
+
+Refer to [Palette Agent Parameters Documentation](https://docs.spectrocloud.com/clusters/edge/edge-configuration/installer-reference/#palette-agent-parameters) for more details.
+
+## Adding preloaded content in your image
+
+1. Add your content bundle in the `files` directory.
+2. In your userdata, add following stages to copy the content bundle to the desired location. Suppose your content bundle is named as content.zst
+
+```yaml
+#cloud-config
+stages:
+  after-install:
+    - name: Extract content bundle
+      if: "[ -f /tmp/files/content.zst ]"
+      commands:
+        - $STYLUS_ROOT/opt/spectrocloud/bin/palette-agent content-extract --source /tmp/files/content.zst
+```

examples/custom-image/cloud/aws/packer.json

@@ -1,41 +1,48 @@
 {
-  "builders": [{
-    "type": "amazon-ebs",
-    "region": "{{ user `aws_region` }}",
-    "source_ami": "{{user `source_ami`}}",
-    "instance_type": "{{user `builder_instance_type`}}",
-    "ssh_username": "{{user `ssh_username`}}",
-    "ami_name": "{{user `ami_name`}}",
-    "source_ami_filter": {
-      "filters": {
-        "architecture": "x86_64",
-        "name": "{{user `ami_filter_name`}}",
-        "root-device-type": "ebs",
-        "virtualization-type": "hvm"
+  "builders": [
+    {
+      "type": "amazon-ebs",
+      "region": "{{ user `aws_region` }}",
+      "source_ami": "{{user `source_ami`}}",
+      "instance_type": "{{user `builder_instance_type`}}",
+      "ssh_username": "{{user `ssh_username`}}",
+      "ami_name": "{{user `ami_name`}}",
+      "source_ami_filter": {
+        "filters": {
+          "architecture": "x86_64",
+          "name": "{{user `ami_filter_name`}}",
+          "root-device-type": "ebs",
+          "virtualization-type": "hvm"
+        },
+        "most_recent": true,
+        "owners": "{{user `ami_filter_owners`}}"
       },
-      "most_recent": true,
-      "owners": "{{user `ami_filter_owners`}}"
-    },
-    "vpc_id": "{{ user `vpc_id` }}",
-    "subnet_id": "{{ user `subnet_id` }}"
-  }],
+      "vpc_id": "{{ user `vpc_id` }}",
+      "subnet_id": "{{ user `subnet_id` }}"
+    }
+  ],
 
-"provisioners": [
-  {
-    "type": "shell",
-    "inline": [
-      "set -e", 
-      "sudo apt update -y || (echo 'APT Update Failed'; exit 1)",
-      "sudo apt install -y bash systemd rsync rsyslog jq zstd conntrack systemd-timesyncd || (echo 'APT Install Failed'; exit 1)"
-    ]
-  },
-  {
-    "type": "shell",
-    "inline": [
-      "curl -fsSL -o /tmp/palette-agent-install.sh https://github.com/spectrocloud/agent-mode/releases/latest/download/palette-agent-install.sh",
-      "chmod +x /tmp/palette-agent-install.sh",
-      "sudo /tmp/palette-agent-install.sh"
-    ]
-  }
-]
+  "provisioners": [
+    {
+      "type": "shell",
+      "inline": [
+        "set -e",
+        "sudo apt update -y || (echo 'APT Update Failed'; exit 1)",
+        "sudo apt install -y bash systemd rsync rsyslog jq zstd conntrack systemd-timesyncd || (echo 'APT Install Failed'; exit 1)"
+      ]
+    },
+    {
+      "type": "file",
+      "source": "files",
+      "destination": "/tmp"
+    },
+    {
+      "type": "shell",
+      "inline": [
+        "curl -fsSL -o /tmp/palette-agent-install.sh https://github.com/spectrocloud/agent-mode/releases/latest/download/palette-agent-install.sh",
+        "chmod +x /tmp/palette-agent-install.sh",
+        "sudo -E USERDATA=/tmp/files/user-data /tmp/palette-agent-install.sh"
+      ]
+    }
+  ]
 }

examples/custom-image/files/user-data

@@ -0,0 +1,4 @@
+#cloud-config
+stylus:
+  path: /var/lib/spectro
+  installationMode: airgap