Fix remote exec bug and bug with save_cache and ssh mux socket file.

cdist/exec/remote.py

@@ -146,10 +146,9 @@ class Remote(object):
         # remotely in e.g. csh and setting up CDIST_REMOTE_SHELL to e.g.
         # /bin/csh will execute this script in the right way.
         if env:
-            cmd.append("/bin/sh")
-            cmd.append("-c")
             remote_env = [" export %s=%s;" % item for item in env.items()]
-            string_cmd = " ".join(remote_env) + " ".join(command)
+            string_cmd = ("/bin/sh -c '" + " ".join(remote_env)
+                + " ".join(command) + "'")
             cmd.append(string_cmd)
         else:
             cmd.extend(command)

cdist/test/exec/remote.py

@@ -155,9 +155,16 @@ class RemoteTestCase(test.CdistTestCase):
         r = remote.Remote(self.target_host, base_path=self.base_path, remote_exec=remote_exec, remote_copy=remote_copy)
         output = r.run_script(script, return_output=True)
         self.assertEqual(output, "no_env\n")
+
+        handle, remote_exec_path = self.mkstemp(dir=self.temp_dir)
+        with os.fdopen(handle, 'w') as fd:
+            fd.writelines(["#!/bin/sh\n", 'shift; cmd=$1; eval $cmd\n'])
+        os.chmod(remote_exec_path, 0o755)
+        remote_exec = remote_exec_path
         env = {
             '__object': 'test_object',
         }
+        r = remote.Remote(self.target_host, base_path=self.base_path, remote_exec=remote_exec, remote_copy=remote_copy)
         output = r.run_script(script, env=env, return_output=True)
         self.assertEqual(output, "test_object\n")