Using ProcessExecutionError in shell instead of Runtime, and functionalizing old flags conversion in nova

devstack/components/nova.py

@@ -739,20 +739,23 @@ class NovaConfConfigurator(object):
                     cleaned_lines.append(cleaned_line)
         return cleaned_lines
 
+    def _convert_extra_flags(self, extra_flags):
+        converted_flags = list()
+        for f in extra_flags:
+            cleaned_opt = f.lstrip("-")
+            if len(cleaned_opt) == 0:
+                continue
+            if cleaned_opt.find("=") == -1:
+                cleaned_opt += "=%s" % (True)
+            converted_flags.append(cleaned_opt)
+        return converted_flags
+
     def _get_content(self, nova_conf):
         generated_content = nova_conf.generate()
         extra_flags = self._get_extra('extra_flags')
         if extra_flags:
             LOG.warning("EXTRA_FLAGS is defined and may need to be converted to EXTRA_OPTS!")
-            converted_flags = list()
-            for f in extra_flags:
-                cleaned_opt = f.lstrip("-")
-                if len(cleaned_opt) == 0:
-                    continue
-                if cleaned_opt.find("=") == -1:
-                    cleaned_opt += "=%s" % (True)
-                converted_flags.append(cleaned_opt)
-            extra_flags = converted_flags
+            extra_flags = self._convert_extra_flags(extra_flags)
         extra_opts = self._get_extra('extra_opts')
         if extra_flags or extra_opts:
             new_contents = list()

devstack/exceptions.py

@@ -76,17 +76,24 @@ class ConfigException(StackException):
 
 
 class ProcessExecutionError(IOError):
-    def __init__(self, stdout=None, stderr=None, exit_code=None, cmd=None,
+    def __init__(self, stdout=None, stderr=None,
+                 exit_code=None, cmd=None,
                  description=None):
         self.exit_code = exit_code
         self.stderr = stderr
         self.stdout = stdout
         self.cmd = cmd
         self.description = description
-        if description is None:
-            description = ('Unexpected error while running command.')
-        if exit_code is None:
-            exit_code = '-'
+        if self.cmd is None:
+            self.cmd = '-'
+        if self.description is None:
+            self.description = 'Unexpected error while running command.'
+        if self.exit_code is None:
+            self.exit_code = '-'
+        if self.stderr is None:
+            self.stderr = '-'
+        if self.stdout is None:
+            self.stdout = '-'
         message = ('%(description)s\nCommand: %(cmd)s\n'
                     'Exit code: %(exit_code)s\nStdout: %(stdout)r\n'
                     'Stderr: %(stderr)r' % locals())

devstack/shell.py

@@ -143,7 +143,8 @@ def execute(*cmd, **kwargs):
             else:
                 result = obj.communicate()
         except OSError as e:
-            raise RuntimeError('Could not run %s: %s' % (execute_cmd, e))
+            error_description = "%s: [%s, %s]" % (e.message, e.errno, e.strerror)
+            raise excp.ProcessExecutionError(description=error_description, cmd=str_cmd)
         if (stdin_fh != subprocess.PIPE
             and obj.stdin and close_stdin):
             obj.stdin.close()