Support image source on darwin

Signed-off-by: Paweł Gronowski <[email protected]>

src/docker/assets.ts

@@ -176,6 +176,8 @@ disk: 60GiB
 # This file: Mount the home as read-only, /tmp/lima as writable
 mounts:
 - location: "~"
+- location: {{toolDir}}
+  mountPoint: /tool
 - location: "/tmp/lima"
   writable: true
 
@@ -221,7 +223,15 @@ provision:
     EOF
     fi
     export DEBIAN_FRONTEND=noninteractive
-    curl -fsSL https://get.docker.com | sh -s -- --channel {{dockerBinChannel}} --version {{dockerBinVersion}}
+    if [ {{srcType}} == "archive" ]; then
+      curl -fsSL https://get.docker.com | sh -s -- --channel {{srcArchiveChannel}} --version {{srcArchiveVersion}}
+    if [ {{srcType}} == "image" ]; then
+      wget https://raw.githubusercontent.com/moby/moby/refs/heads/{{srcImageTag}}/contrib/init/systemd/docker.service -O /etc/systemd/system/docker.service
+      sed -i 's|^ExecStart=.*|ExecStart=/tool/dockerd|' /etc/systemd/system/docker.service
+      sed -i 's|containerd.service||' /etc/systemd/system/docker.service
+      systemctl daemon-reload
+      systemctl enable --now docker
+    fi
 
 probes:
 - script: |

src/docker/install.ts

@@ -127,13 +127,16 @@ export class Install {
         const cli = await HubRepository.build('dockereng/cli-bin');
         extractFolder = await cli.extractImage(tag);
 
-        // Daemon is only available for Windows and Linux
-        if (['win32', 'linux'].includes(platform)) {
+        if (['win32', 'linux', 'darwin'].includes(platform)) {
           core.info(`Downloading dockerd from moby/moby-bin:${tag}`);
           const moby = await HubRepository.build('moby/moby-bin');
-          await moby.extractImage(tag, extractFolder);
+
+          // On macOS, we extract the Linux version of dockerd which will be run in a lima VM.
+          const extractPlatform = platform == 'darwin' ? 'linux' : undefined;
+
+          await moby.extractImage(tag, extractFolder, extractPlatform);
         } else {
-          core.info(`dockerd not supported on ${platform}`);
+          core.warning(`dockerd not supported on ${platform}, only the Docker cli will be available`);
         }
         break;
       }
@@ -192,10 +195,7 @@ export class Install {
   }
 
   private async installDarwin(): Promise<string> {
-    if (this.source.type !== 'archive') {
-      throw new Error('Only archive source is supported on macOS');
-    }
-    const src = this.source as InstallSourceArchive;
+    const src = this.source;
     const limaDir = path.join(os.homedir(), '.lima', this.limaInstanceName);
     await io.mkdirP(limaDir);
     const dockerHost = `unix://${limaDir}/docker.sock`;
@@ -226,12 +226,16 @@ export class Install {
       handlebars.registerHelper('stringify', function (obj) {
         return new handlebars.SafeString(JSON.stringify(obj));
       });
+      const srcArchive = src as InstallSourceArchive;
       const limaCfg = handlebars.compile(limaYamlData)({
         customImages: Install.limaCustomImages(),
         daemonConfig: limaDaemonConfig,
         dockerSock: `${limaDir}/docker.sock`,
-        dockerBinVersion: src.version.replace(/^v/, ''),
-        dockerBinChannel: src.channel
+        srcType: src.type,
+        srcArchiveVersion: srcArchive.version.replace(/^v/, ''),
+        srcArchiveChannel: srcArchive.channel,
+        srcImageTag: (src as InstallSourceImage).tag,
+        toolDir: this.toolDir
       });
       core.info(`Writing lima config to ${path.join(limaDir, 'lima.yaml')}`);
       fs.writeFileSync(path.join(limaDir, 'lima.yaml'), limaCfg);

src/hubRepository.ts

@@ -42,12 +42,12 @@ export class HubRepository {
 
   // Unpacks the image layers and returns the path to the extracted image.
   // Only OCI indexes/manifest list are supported for now.
-  public async extractImage(tag: string, destDir?: string): Promise<string> {
+  public async extractImage(tag: string, destDir?: string, osPlatform?: string): Promise<string> {
     const index = await this.getManifest<Index>(tag);
     if (index.mediaType != MEDIATYPE_IMAGE_INDEX_V1 && index.mediaType != MEDIATYPE_IMAGE_MANIFEST_LIST_V2) {
       throw new Error(`Unsupported image media type: ${index.mediaType}`);
     }
-    const digest = HubRepository.getPlatformManifestDigest(index);
+    const digest = HubRepository.getPlatformManifestDigest(index, osPlatform);
     const manifest = await this.getManifest<Manifest>(digest);
 
     const paths = manifest.layers.map(async layer => {
@@ -115,9 +115,9 @@ export class HubRepository {
     return <T>JSON.parse(body);
   }
 
-  private static getPlatformManifestDigest(index: Index): string {
+  private static getPlatformManifestDigest(index: Index, osPlatform?: string): string {
     // This doesn't handle all possible platforms normalizations, but it's good enough for now.
-    let pos: string = os.platform();
+    let pos: string = osPlatform || os.platform();
     if (pos == 'win32') {
       pos = 'windows';
     }