Fixes #4301 Use module_common functions for mysqldump and return better errors

library/database/mysql_db

@@ -116,17 +116,25 @@ def db_delete(cursor, db):
     cursor.execute(query)
     return True
 
-def db_dump(host, user, password, db_name, target):
-    res = os.system("/usr/bin/mysqldump -q -h "+host+" -u "+user+ " --password="+password+" "
-            +db_name+" > "
-            +target)
-    return (res == 0)
+def db_dump(module, host, user, password, db_name, target, socket=None):
+    cmd = module.get_bin_path('mysqldump', True)
+    cmd += " --quick --host=%s --user=%s --password=%s" %(host, user, password)
+    if socket is not None:
+        cmd += " --socket=%s" % socket
+    cmd += " %s" % db_name
+    cmd += " > %s" % target
+    rc, stdout, stderr = module.run_command(cmd)
+    return rc, stdout, stderr
 
-def db_import(host, user, password, db_name, target):
-    res = os.system("/usr/bin/mysql -h "+host+" -u "+user+" --password="+password+" "
-            +db_name+" < "
-            +target)
-    return (res == 0)
+def db_import(module, host, user, password, db_name, target, socket=None):
+    cmd = module.get_bin_path('mysqldump', True)
+    cmd += " --host=%s --user=%s --password=%s" %(host, user, password)
+    if socket is not None:
+        cmd += " --socket=%s" % socket
+    cmd += " %s" % db_name
+    cmd += " < %s" % target
+    rc, stdout, stderr = module.run_command(cmd)
+    return rc, stdout, stderr
 
 def db_create(cursor, db, encoding, collation):
     if encoding:
@@ -258,13 +266,21 @@ def main():
         if state == "absent":
             changed = db_delete(cursor, db)
         elif state == "dump":
-            changed = db_dump(login_host, login_user, login_password, db, target)
-            if not changed:
-                module.fail_json(msg="dump failed!")
+            rc, stdout, stderr = db_dump(module, login_host, login_user, 
+                                        login_password, db, target, 
+                                        socket=module.params['login_unix_socket'])
+            if rc != 0:
+                module.fail_json(msg="%s" % stderr)
+            else:
+                module.exit_json(changed=True, db=db, msg=stdout)
         elif state == "import":
-            changed = db_import(login_host, login_user, login_password, db, target)
-            if not changed:
-                module.fail_json(msg="import failed!")
+            rc, stdout, stderr = db_import(module, login_host, login_user, 
+                                        login_password, db, target, 
+                                        socket=module.params['login_unix_socket'])
+            if rc != 0:
+                module.fail_json(msg="%s" % stderr)
+            else:
+                module.exit_json(changed=True, db=db, msg=stdout)
     else:
         if state == "present":
             changed = db_create(cursor, db, encoding, collation)