feat: Add devcontainer feature and update setup script for CVMFS

.github/workflows/publish-feature.yml

@@ -0,0 +1,34 @@
+name: Publish Devcontainer Feature
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Install Devcontainer CLI
+        run: npm install -g @devcontainers/cli
+
+      - name: Login to GitHub Container Registry
+        run: echo "${{ secrets.WRITE_PACKAGES_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
+
+      - name: Add version to environment
+        run: |
+          VERSION="${{ github.ref_name }}"
+          echo "VERSION=$VERSION" >> $GITHUB_ENV
+
+      - name: Add version to devcontainer-feature.json
+        run: |
+          jq --arg VERSION "${{ env.VERSION }}" '.version = $VERSION' src/cvmfs/devcontainer-feature.json > tmp.json
+          mv tmp.json src/cvmfs/devcontainer-feature.json
+
+      - name: Publish Devcontainer Feature
+        run: devcontainer features publish --namespace ${{ github.actor }}/${{ github.repository }} .
+
+      - name: Build Devcontainer Feature
+        run: devcontainer build --workspace-folder . --image-name test-cvmfs-feature --additional-features ghcr.io/${{ github.actor }}/${{ github.repository }}/cvmfs:${{ env.VERSION }}

README.devcontainer-feature.md

@@ -0,0 +1,39 @@
+# CVMFS Devcontainer Feature
+
+This directory contains a devcontainer feature for installing and configuring the CVMFS client. The definition is located in the top-level directory to allow reuse of the GitHub Actions scripts.
+
+## Publishing to GHCR
+
+This feature is intended to be published to the GitHub Container Registry (GHCR) to be easily reusable by other projects.
+
+### Manual Publishing
+
+1.  **Install the Devcontainer CLI:**
+    ```bash
+    npm install -g @devcontainers/cli
+    ```
+
+2.  **Create a Personal Access Token (PAT):**
+    *   Go to GitHub **Settings** > **Developer settings** > **Personal access tokens** > **Tokens (classic)**.
+    *   Generate a new token with the `write:packages` scope.
+    *   Export the token as an environment variable:
+        ```bash
+        export WRITE_PACKAGES_TOKEN=your-personal-access-token
+        ```
+
+3.  **Log in to GHCR:**
+    ```bash
+    echo $WRITE_PACKAGES_TOKEN | docker login ghcr.io -u your-github-username --password-stdin
+    ```
+
+4.  **Publish the Feature:**
+    Run the following command from the root of this repository. The namespace should match the GitHub organization (`cvmfs-contrib`).
+    ```bash
+    devcontainer features publish --namespace cvmfs-contrib/github-action-cvmfs .
+    ```
+
+### Automated Publishing
+
+This repository is configured with a GitHub Actions workflow to automate this process. When a new release is published on GitHub, the workflow will automatically build and publish the feature to GHCR.
+
+For this to work, the `WRITE_PACKAGES_TOKEN` secret (a Personal Access Token with `write:packages` scope) must be configured in the repository's **Settings > Secrets and variables > Actions**.

README.md

@@ -139,6 +139,23 @@ This GitHub Action is only expected to work in workflows that [run on](https://d
 
  `windows` targets are not supported.
 
+## Devcontainer Usage
+
+This repository provide a Dev Container Feature to enable CernVM-FS in your Dev Containers. To use it, open this repository in a devcontainer-compatible editor like VS Code with the Dev Containers extension.
+
+For example, you can add the following to your `devcontainer.json` to use this feature:
+```json
+{
+    "name": "CVMFS Action Dev",
+    "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+    "features": {
+        "ghcr.io/cvmfs-contrib/github-action-cvmfs/cvmfs": {
+            "CVMFS_REPOSITORIES": "sft.cern.ch"
+        }
+    }
+}
+```
+
 ## Use With Docker
 
 In case your workflow uses docker containers, the cvmfs directory can be mounted inside the container by using the flag `-v /cvmfs:/cvmfs:shared`.

devcontainer-feature.json

@@ -0,0 +1,24 @@
+{
+  "name": "CVMFS",
+  "id": "cvmfs",
+  "version": "0.0.0",
+  "description": "Installs CVMFS client",
+  "options": {
+    "CVMFS_REPOSITORIES": {
+      "type": "string",
+      "default": "sft.cern.ch",
+      "description": "Comma-separated list of fully qualified repository names that shall be mountable under /cvmfs"
+    },
+    "CVMFS_CONFIG_PACKAGE": {
+      "type": "string",
+      "default": "cvmfs-config-default",
+      "description": "URL to the cvmfs config package to install"
+    },
+    "CVMFS_HTTP_PROXY": {
+      "type": "string",
+      "default": "DIRECT",
+      "description": "Chain of HTTP proxy groups used by CernVM-FS. Defaults to DIRECT."
+    }
+  },
+  "entrypoint": "install-cvmfs-linux.sh"
+}

setup-cvmfs.sh

@@ -77,7 +77,16 @@ fi
 echo "::endgroup::"
 
 
-if [ "$(uname)" == "Darwin" ]; then
+if [ "$(uname)" == "Linux" ]; then
+  # Mount CVMFS repositories (in case no autofs)
+  for repo in $(echo ${CVMFS_REPOSITORIES} | sed "s/,/ /g")
+  do
+    if [ ! -d /cvmfs/${repo} ]; then
+      sudo mount -t cvmfs ${repo} /cvmfs/${repo}
+    fi
+  done
+elif [ "$(uname)" == "Darwin" ]; then
+  # Mount CVMFS repositories (no autofs available)
   for repo in $(echo ${CVMFS_REPOSITORIES} | sed "s/,/ /g")
   do
     mkdir -p /Users/Shared/cvmfs/${repo}