feat: Add ability to set maxBuffer parameter for spawnSync while exec…

…uting checkov (#9)

Co-authored-by: Andriy Romanov <aromanov@diligent.com>

README.md

@@ -89,3 +89,7 @@ new CheckovValidator({
     skipCheck: ['CKV_AWS_18', 'CKV_AWS_21'],
 });
 ```
+
+### Troubleshooting
+
+If you are getting `Error: spawnSync checkov ENOBUFS` error, please try to set `CHECKOV_MAX_BUFFER_SIZE_MB` environment variable to numeric value above 1. It's setting `maxBuffer` parameter for `spawnSync` [function](https://nodejs.org/api/child_process.html#child_processspawnsynccommand-args-options) under the hood.

src/utils.ts

@@ -12,6 +12,7 @@ export function exec(commandLine: string[], options: { cwd?: string; json?: bool
       ...options.env,
     },
     cwd: options.cwd,
+    maxBuffer: 1024 * 1024 * (parseInt(process.env['CHECKOV_MAX_BUFFER_SIZE_MB']) || 1),
   });
 
   if (proc.error) { throw proc.error; }
@@ -37,4 +38,4 @@ export function exec(commandLine: string[], options: { cwd?: string; json?: bool
     console.error('Not JSON: ' + output);
     throw new Error('Command output is not JSON');
   }
-}
+}