WIP: Use git rev-parse to check path correctness

Instead of check the existness of `.git` directory, use `git rev-parse`
to check that `req.path` is in

* a Git repository
* a Git submodule
* the root of the repo/submodule

The old method didn't worked with submodules more than one level deep in
the repo. Besides this if the $GIT_DIR differs from `.git` (cannot find
a real life example), then the old method fails to work.

Related to mixu#54

lib/command-requirements.js

@@ -1,27 +1,24 @@
 var fs = require('fs'),
- path = require('path');
+ path = require('path'),
+ exec = require('child_process').exec;
 
 module.exports = {
  git: function(req) {
- var stat;
  try {
- stat = fs.statSync(req.path + '/.git/');
- if (stat.isDirectory()) {
- return true;
- }
- } catch (e) {
- // check if the directory is a submodule
- // addresses https://github.com/mixu/gr/issues/54
- if (e.code === 'ENOTDIR' || e.code === 'ENOENT') {
- var parentPath = path.dirname(req.path);
- try {
- stat = fs.statSync(parentPath + '/.gitmodules');
- if (stat.isFile()) {
- return true;
- }
- } catch (e) { }
- }
- }
+ exec('git rev-parse --show-prefix', {
+ cwd: req.path,
+ }, function(err, stdout, stderr) {
+ stdout = stdout.replace(/(\r\n|\n|\r)/gm,'').trim()
+ if(err !== null) {
+ console.log('*** Not a Git repository, should return false\n>>> req.path: "' + req.path + '"\n>>> err: ' + err + '\n>>> stdout: "' + stdout + '"\n>>> stderr: "' + stderr + '"');
+ }
+ if(stdout) {
+ console.log('*** Not in repository/submodule root dir, should return false\n>>> req.path: "' + req.path + '"\n>>> err: ' + err + '\n>>> stdout: "' + stdout + '"\n>>> stderr: "' + stderr + '"');
+ }
+ console.log('*** OK, return true or do nothing\n>>> req.path: "' + req.path + '"\n>>> err: ' + err + '\n>>> stdout: "' + stdout + '"\n>>> stderr: "' + stderr + '"');
+ });
+ return true;
+ } catch (e) { }
  if (req.format === 'human') {
  console.log('Skipped ' + req.path + ' as it does not have a .git subdirectory and is not a submodule.');
  }