feat: support npm_config_cache to change default cache dir (#335)

```bash npm_config_cache=/oss/cache/.npminstall npminstall koa ```
cnpm · Oct 30, 2020 · d598f9d · d598f9d
1 parent f87d6bd
commit d598f9d
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diff --git a/bin/install.js b/bin/install.js
@@ -153,6 +153,10 @@ let cacheDir = argv.cache === false ? '' : null;
 if (production) {
   cacheDir = '';
 }
+// support npm_config_cache to change default cache dir
+if (cacheDir === null && process.env.npm_config_cache) {
+  cacheDir = process.env.npm_config_cache;
+}
 
 let forbiddenLicenses = argv['forbidden-licenses'];
 forbiddenLicenses = forbiddenLicenses ? forbiddenLicenses.split(',') : null;

diff --git a/test/install-cache-strict.test.js b/test/install-cache-strict.test.js
@@ -34,6 +34,19 @@ describe('test/install-cache-strict.test.js', () => {
     assert(await fs.stat(path.join(homedir, '.npminstall_tarball/d/e/b/u/debug')));
   });
 
+  it('should read disk cache from npm_config_cache env', async () => {
+    await coffee.fork(helper.npminstall, [], {
+      cwd: demo,
+      env: Object.assign({}, process.env, {
+        HOME: homedir,
+        npm_config_cache: path.join(homedir, 'foocache/.npminstall_tarball'),
+      }),
+    })
+      .debug()
+      .end();
+    assert(await fs.stat(path.join(homedir, 'foocache/.npminstall_tarball/d/e/b/u/debug')));
+  });
+
   it('should read disk cache on --cache-strict NODE_ENV=production', async () => {
     await coffee.fork(helper.npminstall, [ '--cache-strict' ], {
       cwd: demo,