fix: resolve symbolic links completely when hunting for subcommands

index.js

@@ -527,14 +527,11 @@ Command.prototype.executeSubCommand = function(argv, args, unknown) {
 
   // In case of globally installed, get the base dir where executable
   //  subcommand file should be located at
-  var baseDir,
-    link = fs.lstatSync(f).isSymbolicLink() ? fs.readlinkSync(f) : f;
+  var baseDir;
 
-  // when symbolink is relative path
-  if (link !== f && link.charAt(0) !== '/') {
-    link = path.join(dirname(f), link);
-  }
-  baseDir = dirname(link);
+  var resolvedLink = fs.realpathSync(f);
+
+  baseDir = dirname(resolvedLink);
 
   // prefer local `./<bin>` to bin in the $PATH
   var localBin = path.join(baseDir, bin);

test/fixtures/another-dir/pm

@@ -0,0 +1 @@
+../other-dir/pm

test/fixtures/other-dir/pm

@@ -0,0 +1 @@
+../pm

test/test.command.executableSubcommand.js

@@ -34,3 +34,10 @@ var bin = path.join(__dirname, './fixtures/pmlink')
 exec(bin + ' install', function (error, stdout, stderr) {
   stdout.should.equal('install\n');
 });
+
+// when `bin` is a symbol link pointing at a symbolic for mocking global install
+var bin = path.join(__dirname, './fixtures/another-dir/pm')
+// success case
+exec(bin + ' install', function (error, stdout, stderr) {
+  stdout.should.equal('install\n');
+});

test/test.command.executableSubcommandAlias.js

@@ -26,3 +26,10 @@ var bin = path.join(__dirname, './fixtures/pmlink')
 exec(bin + ' i', function (error, stdout, stderr) {
   stdout.should.equal('install\n');
 });
+
+// when `bin` is a symbol link pointing at a symbolic for mocking global install
+var bin = path.join(__dirname, './fixtures/another-dir/pm')
+// success case
+exec(bin + ' install', function (error, stdout, stderr) {
+  stdout.should.equal('install\n');
+});

test/test.command.executableSubcommandDefault.js

@@ -44,3 +44,10 @@ var bin = path.join(__dirname, './fixtures/pmlink')
 exec(bin + ' install', function (error, stdout, stderr) {
   stdout.should.equal('install\n');
 });
+
+// when `bin` is a symbol link pointing at a symbolic for mocking global install
+var bin = path.join(__dirname, './fixtures/another-dir/pm')
+// success case
+exec(bin + ' install', function (error, stdout, stderr) {
+  stdout.should.equal('install\n');
+});