[Dev] enable opensearch snapshot for Darwin (#3537)

Enable the downloading of Darwin for running the command
`yarn opensearch snapshot`.

Darwin is not officially supported but snapshots are being
built here:
https://build.ci.opensearch.org/job/distribution-build-opensearch/

Issue resolved:
#2944

Signed-off-by: Kawika Avilla <kavilla414@gmail.com>
Co-authored-by: Josh Romero <rmerqg@amazon.com>
(cherry picked from commit 81a5fad)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

# Conflicts:
#	CHANGELOG.md

DEVELOPER_GUIDE.md

@@ -110,7 +110,7 @@ $ yarn osd clean
 
 OpenSearch Dashboards requires a running version of OpenSearch to connect to. In a separate terminal you can run the latest snapshot built using:
 
-_(Linux and Windows only - for MacOS, you'll need to [run OpenSearch from a tarball](#alternative---run-opensearch-from-tarball) instead)_
+_(Linux, Windows, Darwin (MacOS) only - for others, you'll need to [run OpenSearch from a tarball](#alternative---run-opensearch-from-tarball) instead)_
 ```bash
 $ yarn opensearch snapshot
 ```
@@ -184,7 +184,7 @@ By default, the snapshot command will run [a minimal distribution of OpenSearch]
 
 If you would like to run OpenSearch with a particular plugin installed on the cluster snapshot, pass the `--P` flag after `yarn opensearch snapshot`. You can use the flag multiple times to install multiple plugins. The argument value can be a URL to the plugin's zip file, maven coordinates of the plugin, or a local zip file path (use `file://` followed by the absolute or relative path, in that case). For example:
 
-_(Linux and Windows only - for MacOS, you'll need to [run OpenSearch from a tarball](#alternative---run-opensearch-from-tarball) instead)_
+_(Linux, Windows, Darwin (MacOS) only - for others, you'll need to [run OpenSearch from a tarball](#alternative---run-opensearch-from-tarball) instead)_
 ```bash
 $ yarn opensearch snapshot --P https://repo1.maven.org/maven2/org/opensearch/plugin/opensearch-test-plugin/2.4.0.0/opensearch-test-plugin-2.4.0.0.zip
 ```
@@ -214,7 +214,7 @@ $ yarn opensearch snapshot --version 2.2.0 -E cluster.name=test -E path.data=/tm
 
 ### Alternative - Run OpenSearch from tarball
 
-OpenSearch does not yet create artifacts for MacOS, so you'll need to download, install, and run the tarball instead. (You'll also need Java installed and the `JAVA_HOME` environmental variable set - see [OpenSearch developer guide](https://github.com/opensearch-project/OpenSearch/blob/main/DEVELOPER_GUIDE.md#install-prerequisites) for details).
+If you would like to run OpenSearch from the tarball, you'll need to download the minimal distribution, install it, and then run the executable. (You'll also need Java installed and the `JAVA_HOME` environmental variable set - see [OpenSearch developer guide](https://github.com/opensearch-project/OpenSearch/blob/main/DEVELOPER_GUIDE.md#install-prerequisites) for details).
 
 1. Download the latest minimal distribution of OpenSearch from [the downloads page](https://opensearch.org/downloads.html#minimal). Note the version and replace in commands below.
 2. Unzip the `tar.gz` file: `tar -xvf opensearch-<OpenSearch-version>-linux-x64.tar.gz`

packages/osd-opensearch/src/artifact.js

@@ -39,6 +39,7 @@ const { createHash } = require('crypto');
 const path = require('path');
 
 const asyncPipeline = promisify(pipeline);
+const SUPPORTED_PLATFORMS = ['linux', 'windows', 'darwin'];
 const DAILY_SNAPSHOTS_BASE_URL = 'https://artifacts.opensearch.org/snapshots/core/opensearch';
 // TODO: [RENAMEME] currently do not have an existing replacement
 // issue: https://github.com/opensearch-project/OpenSearch-Dashboards/issues/475
@@ -184,8 +185,8 @@ async function getArtifactSpecForSnapshotFromUrl(urlVersion, log) {
   const arch = process.arch === 'arm64' ? 'arm64' : 'x64';
   const extension = process.platform === 'win32' ? 'zip' : 'tar.gz';
 
-  if (platform !== 'linux' && platform !== 'windows') {
-    throw createCliError(`Snapshots are only available for Linux and Windows`);
+  if (!SUPPORTED_PLATFORMS.includes(platform)) {
+    throw createCliError(`Snapshots are only available for Linux, Windows, and Darwin`);
   }
 
   const latestUrl = `${DAILY_SNAPSHOTS_BASE_URL}/${desiredVersion}-SNAPSHOT`;

packages/osd-opensearch/src/artifact.test.js

@@ -164,17 +164,17 @@ describe('Artifact', () => {
         });
       });
 
-      it('should throw when on a non-Linux or non-Windows platform', async () => {
+      it('should throw when on a non-Linux, non-Windows, non-Darwin platform', async () => {
         Object.defineProperties(process, {
           platform: {
-            value: 'darwin',
+            value: 'android',
           },
           arch: {
             value: ORIGINAL_ARCHITECTURE,
           },
         });
         await expect(Artifact.getSnapshot('default', 'INVALID_PLATFORM', log)).rejects.toThrow(
-          'Snapshots are only available for Linux'
+          'Snapshots are only available for Linux, Windows, and Darwin'
         );
       });
 
@@ -190,6 +190,42 @@ describe('Artifact', () => {
         mockFetch(MOCKS.multipleArch[0]);
         artifactTest();
       });
+
+      it('should not throw when on a Linux platform', async () => {
+        Object.defineProperties(process, {
+          platform: {
+            value: 'linux',
+          },
+          arch: {
+            value: 'x64',
+          },
+        });
+        artifactTest();
+      });
+
+      it('should not throw when on a Windows platform', async () => {
+        Object.defineProperties(process, {
+          platform: {
+            value: 'win32',
+          },
+          arch: {
+            value: 'x64',
+          },
+        });
+        artifactTest();
+      });
+
+      it('should not throw when on a Darwin platform', async () => {
+        Object.defineProperties(process, {
+          platform: {
+            value: 'darwin',
+          },
+          arch: {
+            value: 'x64',
+          },
+        });
+        artifactTest();
+      });
     });
 
     describe('with custom snapshot manifest URL', () => {