feat: add docker-socket-host-path input (#862)

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

README.md

@@ -13,6 +13,7 @@ GitHub Action to run Renovate self-hosted.
   - [`configurationFile`](#configurationfile)
   - [`docker-cmd-file`](#docker-cmd-file)
   - [`docker-network`](#docker-network)
+  - [`docker-socket-host-path`](#docker-socket-host-path)
   - [`docker-user`](#docker-user)
   - [`docker-volumes`](#docker-volumes)
   - [`env-regex`](#env-regex)
@@ -113,6 +114,12 @@ Specify a network to run container in.
 You can use `${{ job.container.network }}` to run renovate container [in the same network as other containers for this job](https://docs.github.com/en/actions/learn-github-actions/contexts#job-context),
 or set it to `host` to run in the same network as github runner, or specify any custom network.
 
+### `docker-socket-host-path`
+
+Allows the overriding of the host path for the Docker socket that is mounted into the container.
+Useful on systems where the host Docker socket is located somewhere other than `/var/run/docker.sock` (the default).
+Only applicable when `mount-docker-socket` is true.
+
 ### `docker-user`
 
 Specify a user (or user-id) to run docker command.

action.yml

@@ -36,6 +36,13 @@ inputs:
       can use Docker. Also add the user inside the renovate container to the
       docker group for socket permissions.
     required: false
+  docker-socket-host-path:
+    description: |
+      Allows the overriding of the host path for the Docker socket that is mounted into the container.
+      Useful on systems where the host Docker socket is located somewhere other than '/var/run/docker.sock' (the default).
+      Only applicable when 'mount-docker-socket' is true.
+    required: false
+    default: /var/run/docker.sock
   docker-cmd-file:
     description: |
       Override docker command. Default command is `renovate`

src/input.ts

@@ -73,6 +73,10 @@ class Input {
     return core.getInput('mount-docker-socket') === 'true';
   }
 
+  dockerSocketHostPath(): string {
+    return core.getInput('docker-socket-host-path') || '/var/run/docker.sock';
+  }
+
   getDockerCmdFile(): string | null {
     const cmdFile = core.getInput('docker-cmd-file');
     return !!cmdFile && cmdFile !== '' ? path.resolve(cmdFile) : null;

src/renovate.ts

@@ -33,8 +33,16 @@ class Renovate {
     }
 
     if (this.input.mountDockerSocket()) {
+      const sockPath = this.input.dockerSocketHostPath();
+      const stat = await fs.stat(sockPath);
+      if (!stat.isSocket()) {
+        throw new Error(
+          `docker socket host path '${sockPath}' MUST exist and be a socket`,
+        );
+      }
+
       dockerArguments.push(
-        '--volume /var/run/docker.sock:/var/run/docker.sock',
+        `--volume ${sockPath}:/var/run/docker.sock`,
         `--group-add ${await this.getDockerGroupId()}`,
       );
     }