Added setup-helm : Install helm binary

src/run.ts

@@ -0,0 +1,119 @@
+import * as os from 'os';
+import * as path from 'path';
+import * as util from 'util';
+import * as fs from 'fs';
+
+import * as toolCache from '../node_modules/@actions/tool-cache';
+import * as core from '../node_modules/@actions/core';
+
+const helmToolName = 'helm';
+const stableHelmVersion = 'v2.14.1';
+const helmLatestReleaseUrl  = 'https://api.github.com/repos/helm/helm/releases/latest';
+
+function getExecutableExtension(): string {
+    if (os.type().match(/^Win/)) {
+        return '.exe';
+    }
+    return '';
+}
+
+function getHelmDownloadURL(version: string): string {
+    switch (os.type()) {
+        case 'Linux':
+            return util.format('https://get.helm.sh/helm-%s-linux-amd64.zip', version);
+
+        case 'Darwin':
+            return util.format('https://get.helm.sh/helm-%s-darwin-amd64.zip', version);
+
+        case 'Windows_NT':
+        default:
+            return util.format('https://get.helm.sh/helm-%s-windows-amd64.zip', version);
+
+    }
+}
+
+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;
+    });
+}
+
+
+var walkSync = function(dir, filelist, fileToFind) {
+    var fs = fs || require('fs'),
+        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));
+          }
+      }
+    });
+    return filelist;
+  };
+  
+async function downloadHelm(version: string): Promise<string> {
+    if (!version) { version = await getStableHelmVersion(); }
+    let cachedToolpath = toolCache.find(helmToolName, version);
+    if (!cachedToolpath) {
+        let helmDownloadPath;
+        try {
+            helmDownloadPath = await toolCache.downloadTool(getHelmDownloadURL(version));
+        } catch (exception) {
+            throw new Error(util.format("Failed to download Helm from location ", getHelmDownloadURL(version)));
+        }
+
+        fs.chmodSync(helmDownloadPath, '777');
+        const unzipedHelmPath = await toolCache.extractZip(helmDownloadPath);
+        cachedToolpath = await toolCache.cacheDir(unzipedHelmPath, helmToolName, version);
+    }
+
+    const helmpath = findHelm(cachedToolpath);
+    if (!helmpath) {
+        
+    }
+    
+    fs.chmodSync(helmpath, '777');
+    return helmpath;
+}
+
+function findHelm(rootFolder: string): string {
+    fs.chmodSync(rootFolder, '777');
+    var filelist: string[] = [];
+    walkSync(rootFolder, filelist, helmToolName + getExecutableExtension());
+    if (!filelist) {
+        throw new Error(util.format("Helm executable not found in path ", rootFolder));
+    }
+    else {
+        return filelist[0];
+    }
+}
+
+async function run() {
+    let version = core.getInput('version', { 'required': true });
+    if (version.toLocaleLowerCase() === 'latest') {
+        version = await getStableHelmVersion();
+    }
+
+    let cachedPath = await downloadHelm(version);
+    console.log(`Helm tool version: '${version}' has been cached at ${cachedPath}`);
+    core.setOutput('helm-path', cachedPath);
+}
+
+run().catch(core.setFailed);