Make stdout maxBuffer length to be configurable

The default value is set to 4Gb.

Fixes: #3925

Signed-off-by: Victor Rubezhny <vrubezhny@redhat.com>

package.json

@@ -2238,6 +2238,11 @@
 						"type": "number",
 						"default": 90000,
 						"description": "Controls stopping development mode timeout (in milliseconds)."
+					},
+					"openshiftToolkit.execMaxBufferLength": {
+						"type": "number",
+						"default": 4,
+						"description": "MiB of memory to allocate for stdout buffer when executing a binary"
 					}
 				}
 			},

src/util/childProcessUtil.ts

@@ -78,10 +78,17 @@ export class ChildProcessUtil {
         this.odoChannel = odoChannel;
     }
 
+    public static getExecMaxBufferLength(): number {
+        const execMaxBufferLengthFromSetting: string = vscode.workspace.getConfiguration('openshiftToolkit')
+            .get('execMaxBufferLength');
+        const length = parseInt(execMaxBufferLengthFromSetting, 10);
+        return (!isNaN(length) && length > 0 ? length : 4) * 1024 * 1024;
+    }
+
     public execute(cmd: string, opts: cp.ExecOptions = {}): Promise<CliExitData> {
         return new Promise<CliExitData>((resolve) => {
             if (opts.maxBuffer === undefined) {
-                opts.maxBuffer = 2 * 1024 * 1024;
+                opts.maxBuffer = ChildProcessUtil.getExecMaxBufferLength();
             }
             cp.exec(cmd, opts, (error: cp.ExecException, stdout: string, stderr: string) => {
                 // filter out info about update

test/unit/util/childProcessUtil.test.ts

@@ -3,6 +3,7 @@
  *  Licensed under the MIT License. See LICENSE file in the project root for license information.
  *-----------------------------------------------------------------------------------------------*/
 
+import * as vscode from 'vscode';
 import * as chai from 'chai';
 import * as childProcess from 'child_process';
 import * as sinon from 'sinon';
@@ -43,6 +44,9 @@ suite('ChildProcessUtil', function() {
     });
 
     test('execute uses a 2MB buffer by default', async function() {
+        // Change Exec Max Buffer Length to 2Mb (while the default value is 4Gb)
+        await vscode.workspace.getConfiguration('openshiftToolkit').update('execMaxBufferLength', 2);
+
         execStub.yields(null, stdout, '');
         await childProcessUtil.execute(command);