Check module_path permissions when creating ssh_wrapper for git

If the module directory is not writable/executable to the current user
(most likely because of a sudo to a non-root user), the ssh_wrapper
will be created in the default location for mkstemp() calls. To facilitate
the deletion of these new files, a new mechanism for cleaning up files
created by the module was also added.

Fixes #7375

lib/ansible/module_utils/basic.py

@@ -182,6 +182,7 @@ class AnsibleModule(object):
         self.supports_check_mode = supports_check_mode
         self.check_mode = False
         self.no_log = no_log
+        self.cleanup_files = []
         
         self.aliases = {}
         
@@ -898,11 +899,20 @@ class AnsibleModule(object):
     def from_json(self, data):
         return json.loads(data)
 
+    def add_cleanup_file(self, path):
+        if path not in self.cleanup_files:
+            self.cleanup_files.append(path)
+
+    def do_cleanup_files(self):
+        for path in self.cleanup_files:
+            self.cleanup(path)
+
     def exit_json(self, **kwargs):
         ''' return from the module, without error '''
         self.add_path_info(kwargs)
         if not 'changed' in kwargs:
             kwargs['changed'] = False
+        self.do_cleanup_files()
         print self.jsonify(kwargs)
         sys.exit(0)
 
@@ -911,6 +921,7 @@ class AnsibleModule(object):
         self.add_path_info(kwargs)
         assert 'msg' in kwargs, "implementation error -- msg to explain the error is required"
         kwargs['failed'] = True
+        self.do_cleanup_files()
         print self.jsonify(kwargs)
         sys.exit(1)
 
@@ -958,7 +969,7 @@ class AnsibleModule(object):
             self.fail_json(msg='Could not make backup of %s to %s: %s' % (fn, backupdest, e))
         return backupdest
 
-    def cleanup(self,tmpfile):
+    def cleanup(self, tmpfile):
         if os.path.exists(tmpfile):
             try:
                 os.unlink(tmpfile)

library/source_control/git

@@ -181,7 +181,15 @@ def get_submodule_update_params(module, git_path, cwd):
 
 def write_ssh_wrapper():
     module_dir = get_module_path()
+    try:
+        # make sure we have full permission to the module_dir, which
+        # may not be the case if we're sudo'ing to a non-root user
+        if os.access(module_dir, os.W_OK|os.R_OK|os.X_OK):
             fd, wrapper_path = tempfile.mkstemp(prefix=module_dir + '/')
+        else:
+            raise OSError
+    except (IOError, OSError):
+        fd, wrapper_path = tempfile.mkstemp()
     fh = os.fdopen(fd, 'w+b')
     template = """#!/bin/sh
 if [ -z "$GIT_SSH_OPTS" ]; then
@@ -505,6 +513,7 @@ def main():
     if key_file or ssh_opts:
         ssh_wrapper = write_ssh_wrapper()
         set_git_ssh(ssh_wrapper, key_file, ssh_opts)
+        module.add_cleanup_file(path=ssh_wrapper)
 
     # add the git repo's hostkey 
     if module.params['ssh_opts'] is not None: