Manage an instance of docker as a symlink to nerdctl

Signed-off-by: Eric Promislow <epromislow@suse.com>

background.ts

@@ -135,6 +135,8 @@ async function doFirstRun() {
       linkResource('helm', true),
       linkResource('kim', true),
       linkResource('kubectl', true),
+      linkResource('nerdctl', true),
+      linkResource('docker', true),
     ]);
   }
 }

scripts/download/tools.mjs

@@ -136,6 +136,15 @@ export default async function main(platform) {
   }
   await download(kimURL, kimPath, { expectedChecksum: kimSHA[0].split(/\s+/, 1)[0] });
 
+  if (kubePlatform === 'darwin') {
+    // Symlink nerdctl to docker
+    try {
+      await fs.promises.symlink(path.join(binDir, exeName('nerdctl')), path.join(binDir, exeName('docker')), 'file');
+    } catch (err) {
+      console.log(`Failed to symlink nerdctl to docker in ${ binDir }`, err);
+    }
+  }
+
   // Download Trivy
   // Always run this in the VM, so download the *LINUX* version into binDir
   // and move it over to the wsl/lima partition at runtime.

src/assets/scripts/install-wsl-helpers

@@ -12,3 +12,6 @@ set -o errexit -o nounset
 mkdir -p "/mnt/wsl/rancher-desktop/bin/"
 cp "${1}" "/mnt/wsl/rancher-desktop/bin/nerdctl"
 chmod u+s "/mnt/wsl/rancher-desktop/bin/nerdctl"
+if [ ! -f "/mnt/wsl/rancher-desktop/bin/docker" ] ; then
+  ln -s "/mnt/wsl/rancher-desktop/bin/nerdctl" "/mnt/wsl/rancher-desktop/bin/docker"
+fi

src/k8s-engine/lima.ts

@@ -871,7 +871,7 @@ export default class LimaBackend extends events.EventEmitter implements K8s.Kube
 
     if (state) {
       try {
-        await fs.promises.symlink(desiredPath, linkPath, 'file');
+        await fs.promises.symlink(desiredPath, linkPath);
       } catch (err) {
         const message = `Error creating symlink for ${ linkPath }:`;
 
@@ -890,5 +890,35 @@ export default class LimaBackend extends events.EventEmitter implements K8s.Kube
         return `${ message } ${ err.message }`;
       }
     }
+    if (path.basename(linkPath) === 'nerdctl') {
+      await this.manageDockerSymlink(path.dirname(linkPath), state);
+    }
+  }
+
+  async manageDockerSymlink(targetDir: string, state: boolean): Promise<void> {
+    const desiredPath = resources.executable(path.basename('docker'));
+    const linkPath = path.join(targetDir, 'docker');
+
+    if (state) {
+      try {
+        await fs.promises.symlink(desiredPath, linkPath);
+      } catch (err) {
+        console.log(`Failed to create symlink from ${ desiredPath } to ${ linkPath }:`, err);
+      }
+    } else {
+      try {
+        const actualSourcePath = await fs.promises.readlink(linkPath);
+
+        if (actualSourcePath === desiredPath) {
+          try {
+            await fs.promises.unlink(linkPath);
+          } catch (err) {
+            console.log(`Failed to remove link from ${ desiredPath } to ${ linkPath }:`, err);
+          }
+        }
+      } catch (err) {
+        // Ignore other cases: no docker in targetDir, or not a symlink
+      }
+    }
   }
 }

src/resources.ts

@@ -4,6 +4,7 @@ import { app } from 'electron';
 import memoize from 'lodash/memoize';
 
 const adjustNameWithDir: Record<string, string> = {
+  docker:  path.join('bin', 'docker'),
   helm:    path.join('bin', 'helm'),
   kim:     path.join('bin', 'kim'),
   kubectl: path.join('bin', 'kubectl'),