Adding semver to package.json

Use correct version string format in setup instructions

README.md

@@ -1,7 +1,7 @@
 # Setup Helm
 #### Install a specific version of helm binary on the runner.
 
-Acceptable values are latest or any semantic version string like 1.15.0. Use this action in workflow to define which version of helm will be used.
+Acceptable values are latest or any semantic version string like `1.15.0`. Use this action in workflow to define which version of helm will be used.
 
 ```yaml
 - uses: azure/setup-helm@v1

lib/run.js

@@ -22,11 +22,12 @@ const os = __importStar(require("os"));
 const path = __importStar(require("path"));
 const util = __importStar(require("util"));
 const fs = __importStar(require("fs"));
+const semver = __importStar(require("semver"));
 const toolCache = __importStar(require("@actions/tool-cache"));
 const core = __importStar(require("@actions/core"));
 const helmToolName = 'helm';
-const stableHelmVersion = 'v2.14.1';
-const helmLatestReleaseUrl = 'https://api.github.com/repos/helm/helm/releases/latest';
+const stableHelmVersion = 'v3.2.1';
+const helmAllReleasesUrl = 'https://api.github.com/repos/helm/helm/releases';
 function getExecutableExtension() {
     if (os.type().match(/^Win/)) {
         return '.exe';
@@ -46,17 +47,28 @@ function getHelmDownloadURL(version) {
 }
 function getStableHelmVersion() {
     return __awaiter(this, void 0, void 0, function* () {
-        return toolCache.downloadTool(helmLatestReleaseUrl).then((downloadPath) => {
-            const response = JSON.parse(fs.readFileSync(downloadPath, 'utf8').toString().trim());
-            if (!response.tag_name) {
-                return stableHelmVersion;
-            }
-            return response.tag_name;
-        }, (error) => {
-            core.debug(error);
-            core.warning(util.format("Failed to read latest kubectl version from stable.txt. From URL %s. Using default stable version %s", helmLatestReleaseUrl, stableHelmVersion));
-            return stableHelmVersion;
-        });
+        try {
+            const downloadPath = yield toolCache.downloadTool(helmAllReleasesUrl);
+            const responseArray = JSON.parse(fs.readFileSync(downloadPath, 'utf8').toString().trim());
+            let latestHelmVersion = semver.clean(stableHelmVersion);
+            responseArray.forEach(response => {
+                if (response && response.tag_name) {
+                    let currentHelmVerison = semver.clean(response.tag_name.toString());
+                    if (currentHelmVerison) {
+                        if (currentHelmVerison.toString().indexOf('rc') == -1 && semver.gt(currentHelmVerison, latestHelmVersion)) {
+                            //If current helm version is not a pre release and is greater than latest helm version
+                            latestHelmVersion = currentHelmVerison;
+                        }
+                    }
+                }
+            });
+            latestHelmVersion = "v" + latestHelmVersion;
+            return latestHelmVersion;
+        }
+        catch (error) {
+            core.warning(util.format("Cannot get the latest Helm info from %s. Error %s. Using default Helm version %s.", helmAllReleasesUrl, error, stableHelmVersion));
+        }
+        return stableHelmVersion;
     });
 }
 var walkSync = function (dir, filelist, fileToFind) {

package.json

@@ -9,7 +9,8 @@
         "@actions/tool-cache": "1.1.2",
         "@actions/io": "^1.0.0",
         "@actions/core": "^1.0.0",
-        "@actions/exec": "^1.0.0"
+        "@actions/exec": "^1.0.0",
+        "semver": "^6.1.0"
     },
     "main": "lib/run.js",
     "scripts": {

src/run.ts

@@ -5,13 +5,14 @@ import * as os from 'os';
 import * as path from 'path';
 import * as util from 'util';
 import * as fs from 'fs';
+import * as semver from 'semver';
 
 import * as toolCache from '@actions/tool-cache';
 import * as core from '@actions/core';
 
 const helmToolName = 'helm';
-const stableHelmVersion = 'v2.14.1';
-const helmLatestReleaseUrl  = 'https://api.github.com/repos/helm/helm/releases/latest';
+const stableHelmVersion = 'v3.2.1';
+const helmAllReleasesUrl = 'https://api.github.com/repos/helm/helm/releases';
 
 function getExecutableExtension(): string {
     if (os.type().match(/^Win/)) {
@@ -36,40 +37,48 @@ function getHelmDownloadURL(version: string): string {
 }
 
 async function getStableHelmVersion(): Promise<string> {
-    return toolCache.downloadTool(helmLatestReleaseUrl).then((downloadPath) => {
-        const response = JSON.parse(fs.readFileSync(downloadPath, 'utf8').toString().trim());
-        if (!response.tag_name)
-        {
-            return stableHelmVersion;
-        }
-        
-        return response.tag_name;
-    }, (error) => {
-        core.debug(error);
-        core.warning(util.format("Failed to read latest kubectl version from stable.txt. From URL %s. Using default stable version %s", helmLatestReleaseUrl, stableHelmVersion));
-        return stableHelmVersion;
-    });
+    try {
+        const downloadPath = await toolCache.downloadTool(helmAllReleasesUrl);
+        const responseArray = JSON.parse(fs.readFileSync(downloadPath, 'utf8').toString().trim());
+        let latestHelmVersion = semver.clean(stableHelmVersion);
+        responseArray.forEach(response => {
+            if (response && response.tag_name) {
+                let currentHelmVerison = semver.clean(response.tag_name.toString());
+                if (currentHelmVerison) {
+                    if (currentHelmVerison.toString().indexOf('rc') == -1 && semver.gt(currentHelmVerison, latestHelmVersion)) {
+                        //If current helm version is not a pre release and is greater than latest helm version
+                        latestHelmVersion = currentHelmVerison;
+                    }
+                }
+            }
+        });
+        latestHelmVersion = "v" + latestHelmVersion;
+        return latestHelmVersion;
+    } catch (error) {
+        core.warning(util.format("Cannot get the latest Helm info from %s. Error %s. Using default Helm version %s.", helmAllReleasesUrl, error, stableHelmVersion));
+    }
+
+    return stableHelmVersion;
 }
 
 
-var walkSync = function(dir, filelist, fileToFind) {
+var walkSync = function (dir, filelist, fileToFind) {
     var files = fs.readdirSync(dir);
     filelist = filelist || [];
-    files.forEach(function(file) {
-      if (fs.statSync(path.join(dir, file)).isDirectory()) {
-        filelist = walkSync(path.join(dir, file), filelist, fileToFind);
-      }
-      else {
-          core.debug(file);
-          if(file == fileToFind)
-          {
-             filelist.push(path.join(dir, file));
-          }
-      }
+    files.forEach(function (file) {
+        if (fs.statSync(path.join(dir, file)).isDirectory()) {
+            filelist = walkSync(path.join(dir, file), filelist, fileToFind);
+        }
+        else {
+            core.debug(file);
+            if (file == fileToFind) {
+                filelist.push(path.join(dir, file));
+            }
+        }
     });
     return filelist;
-  };
-  
+};
+
 async function downloadHelm(version: string): Promise<string> {
     if (!version) { version = await getStableHelmVersion(); }
     let cachedToolpath = toolCache.find(helmToolName, version);
@@ -90,7 +99,7 @@ async function downloadHelm(version: string): Promise<string> {
     if (!helmpath) {
         throw new Error(util.format("Helm executable not found in path ", cachedToolpath));
     }
-    
+
     fs.chmodSync(helmpath, '777');
     return helmpath;
 }
@@ -114,9 +123,9 @@ async function run() {
     }
 
     let cachedPath = await downloadHelm(version);
-    
+
     try {
-        
+
         if (!process.env['PATH'].startsWith(path.dirname(cachedPath))) {
             core.addPath(path.dirname(cachedPath));
         }