feat: support custom git config

This allows for, among other things, mapping URLs to provide authentication for private repos.

Author: shaug

README.md

@@ -66,6 +66,28 @@ custom:
 With `Dockerfile` the path to the Dockerfile that must be in the current folder (or a subfolder).
 Please note the `dockerImage` and the `dockerFile` are mutually exclusive.
 
+To install requirements with custom git settings (e.g., to map private repositories with
+authentication parameters), add the following to your `serverless.yml`:
+
+```yaml
+custom:
+  pythonRequirements:
+    dockerizePip: true
+    dockerGit: true
+```
+
+The `dockerGit` option will mount your `$HOME/.gitconfig` as a volume in the docker container.
+
+In case you want to use a different git configuration, you can specify the path (absolute) to it through `dockerGitConfig` option:
+
+```yaml
+custom:
+  pythonRequirements:
+    dockerizePip: true
+    dockerGit: true
+    dockerGitConfig: /home/.git/config
+```
+
 To install requirements from private git repositories, add the following to your `serverless.yml`:
 
 ```yaml

lib/pip.js

@@ -286,6 +286,17 @@ async function installRequirements(targetFolder, pluginInstance, funcOptions) {
         );
       }
 
+      if (options.dockerGit) {
+        const homePath = require('os').homedir();
+        const gitConfigPath = options.dockerGitConfig || `${homePath}/.gitconfig`;
+
+        // Mount necessary git files to work with private repos
+        dockerCmd.push(
+          '-v',
+          `${gitConfigPath}:/root/.gitconfig:z`
+        );
+      }
+
       // If we want a download cache...
       const dockerDownloadCacheDir = '/var/useDownloadCache';
       if (options.useDownloadCache) {

test.js

@@ -223,6 +223,32 @@ test(
   { skip: !canUseDocker() || brokenOn('win32') }
 );
 
+test(
+  'dockerGitConfig option correctly resolves docker command',
+  async (t) => {
+    process.chdir('tests/base');
+    const path = npm(['pack', '../..']);
+    npm(['i', path]);
+    const stdout = sls(['package'], {
+      noThrow: true,
+      env: {
+        dockerizePip: true,
+        dockerGit: true,
+        dockerGitConfig: `${__dirname}${sep}tests${sep}base${sep}custom_gitconfig`,
+        dockerImage: 'break the build to log the command',
+      },
+    });
+    t.true(
+      stdout.includes(
+        `-v ${__dirname}${sep}tests${sep}base${sep}custom_gitconfig:/root/.gitconfig:z`
+      ),
+      'docker command properly resolved'
+    );
+    t.end();
+  },
+  { skip: !canUseDocker() || brokenOn('win32') }
+)
+
 test('default pythonBin can package flask with default options', async (t) => {
   process.chdir('tests/base');
   const path = npm(['pack', '../..']);