feat(MongoBinaryDownloadUrl): add support for ubuntu-arm64

fixes #443

Author: hasezoey

docs/guides/supported-systems.md

@@ -25,7 +25,7 @@ Should just work out of the box
 ## MacOS
 
 On x64 systems, it should work right out of the box<br/>
-On Arm64 systems, the architecture needs to be overwritten with `MONGOMS_ARCH=x64`
+On Arm64 systems, the architecture needs to be overwritten with `MONGOMS_ARCH=x64`, only exception being (and based on) `ubuntu`
 
 ## Linux
 
@@ -39,6 +39,9 @@ Highest version (default to) is `2004`
 :::note
 Lower Versions than `2004` may be used if mongodb dosnt provide binaries for an lower version of mongodb for an higher version of ubuntu
 :::
+:::note
+For Arm64 MongoDB only provides binaries for `ubuntu1604`
+:::
 
 ### Debian
 

packages/mongodb-memory-server-core/src/util/MongoBinaryDownloadUrl.ts

@@ -279,6 +279,13 @@ export class MongoBinaryDownloadUrl {
       dist: 'ubuntu',
     };
 
+    // this is, because currently mongodb only really provides arm64 binaries for "ubuntu1604"
+    if (this.arch === 'arm64') {
+      log('getUbuntuVersionString: architecture "arm64" detected, using ubuntu1604');
+
+      return 'ubuntu1604';
+    }
+
     // "id_like" processing (version conversion) [this is an block to be collapsible]
     {
       if (/^linux\s?mint\s*$/i.test(os.dist)) {
@@ -374,18 +381,23 @@ export class MongoBinaryDownloadUrl {
    * @param platform The Platform to translate
    */
   translateArch(arch: string, mongoPlatform: string): string {
-    if (arch === 'ia32') {
-      if (mongoPlatform === 'linux') {
-        return 'i686';
-      } else if (mongoPlatform === 'win32') {
-        return 'i386';
-      }
+    switch (arch) {
+      case 'ia32':
+        if (mongoPlatform === 'linux') {
+          return 'i686';
+        } else if (mongoPlatform === 'win32') {
+          return 'i386';
+        }
 
-      throw new Error('unsupported architecture');
-    } else if (arch === 'x64') {
-      return 'x86_64';
-    } else {
-      throw new Error('unsupported architecture, ia32 and x64 are the only valid options');
+        throw new Error(
+          `Unsupported Architecture-Platform combination: arch: "${arch}", platform: "${mongoPlatform}"`
+        );
+      case 'x64':
+        return 'x86_64';
+      case 'arm64':
+        return 'arm64';
+      default:
+        throw new Error(`Unsupported Architecture: arch: "${arch}"`);
     }
   }
 }

packages/mongodb-memory-server-core/src/util/__tests__/MongoBinaryDownloadUrl.test.ts

@@ -55,7 +55,7 @@ describe('MongoBinaryDownloadUrl', () => {
     });
 
     describe('for linux', () => {
-      it('for ubuntu', async () => {
+      it('for ubuntu x64', async () => {
         const du = new MongoBinaryDownloadUrl({
           platform: 'linux',
           arch: 'x64',
@@ -71,6 +71,22 @@ describe('MongoBinaryDownloadUrl', () => {
         );
       });
 
+      it('for ubuntu arm64', async () => {
+        const du = new MongoBinaryDownloadUrl({
+          platform: 'linux',
+          arch: 'arm64',
+          version: '4.0.20',
+          os: {
+            os: 'linux',
+            dist: 'Ubuntu Linux',
+            release: '20.04',
+          },
+        });
+        expect(await du.getDownloadUrl()).toBe(
+          'https://fastdl.mongodb.org/linux/mongodb-linux-arm64-ubuntu1604-4.0.20.tgz'
+        );
+      });
+
       it('for debian', async () => {
         const du = new MongoBinaryDownloadUrl({
           platform: 'linux',