| Current File : //usr/lib/python2.7/site-packages/vdo/utils/Command.pyc |
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Command - runs commands and manages their results
$Id: //eng/vdo-releases/magnesium/src/python/vdo/utils/Command.py#3 $
i ( t Loggeri����( t Popent PIPENt CommandErrorc B sD e Z d Z d � Z d � Z d � Z d � Z d � Z d � Z RS( s� Exception raised to indicate an error running a command.
Arguments:
exitCode (int): The exit code of the command
stdout (string): The output from the command
stderr (string): The error output from the command
message (string): The (localized) error text; will be formatted with
the remaining arguments
args: Arguments for formatting the message
c C s | j S( N( t _exitCode( t self( ( s5 /usr/lib/python2.7/site-packages/vdo/utils/Command.pyt getExitCode0 s c C s | j S( N( t _stderr( R ( ( s5 /usr/lib/python2.7/site-packages/vdo/utils/Command.pyt getStandardError4 s c C s | | j � | | j � d S( s� Log the outputs of the failed command which generated this exception.
Arguments:
logMethod (callable): The method to log with
N( t _stdoutR ( R t logMethod( ( s5 /usr/lib/python2.7/site-packages/vdo/utils/Command.pyt
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Arguments:
message (string): The (localized) message text; will be formatted
with *args
args: Values to pass to the format of message
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Attributes:
noRun (bool): if True, don't run the command, and always succeed
shell (bool): if True, run this command using shell -c
verbose (int): if > 0, print commands to stdout before executing them
_commandList (list): command and its arguments
i s .Commandc C s | j S( s+ Returns True iff Commands default to noRun.( t defaultNoRun( t cls( ( s5 /usr/lib/python2.7/site-packages/vdo/utils/Command.pyt noRunModek s c C s1 | r | | _ t | _ n | r- | | _ n d S( s� Sets the verbose and noRun default values.
Arguments:
verbose: (boolean) If True, operate verbosely.
noRun: (boolean) If True, do not actually execute.
N( R t Truet defaultVerbose( R t verboset noRun( ( s5 /usr/lib/python2.7/site-packages/vdo/utils/Command.pyt setDefaultsq s
c C s | j d S( s3 Returns an identifier (argv[0]) for error messages.i ( t _commandList( R ( ( s5 /usr/lib/python2.7/site-packages/vdo/utils/Command.pyt commandName� s c K s� | j d d � } | j d d � } | j sE | j d t � | _ n | j � } | d k ry | j j d j | � � n yxt | � D]} | d k r� | j j d j | | � � n | j d k r� d | GH| j j
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S| � n Xd S( s� Run a command.
Returns the output of running the command.
Arguments:
noThrow: If True, will return an empty string instead of throwing on
error.
retries: The number of times to try the command before giving up.
Defaults to 1.
shell: Indicate that this is a shell command
stdin: If not None, the stream from which the command should take
its input, defaults to None.
strip: If True, strip leading and trailing whitespace from the
command output before returning it.
Exceptions:
CommandError: if the command failed and noThrow is False
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an error, or returns the output of the command if there was not.
Arguments:
exitCode (int): the process exit code
stdout (str): the standard output
stderr (str): the standard error
logResults (bool): if True, the results will be logged
Exceptions:
CommandError: if exitCode is non-zero
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Returns the output of the command.
Arguments:
stdin: If not None, the stream from which the command should take its
input.
Exceptions:
CommandError: if the command failed
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stderrdataR; t error( ( s5 /usr/lib/python2.7/site-packages/vdo/utils/Command.pyR3 � s "c C s. d j | j r | j n t t j | j � � S( s. Returns the appropriately quoted command line.RG ( RH R' R# t mapt pipest quote( R ( ( s5 /usr/lib/python2.7/site-packages/vdo/utils/Command.pyR.
s N( R R R R- R R t loggingt getLoggerR t mynameR/ t classmethodR R" R$ R< R, R R RN R3 R. ( ( ( s5 /usr/lib/python2.7/site-packages/vdo/utils/Command.pyR [ s 6 c K s" t | | j d d � � j | � S( s` Run a command.
Returns the output of the command (but see Keyword Arguments).
Arguments:
commandList: The command as a list of strings.
Keyword Arguments:
environment: A dict of environment variables and their values to use for
the command.
noThrow: If True, will return an empty string instead of throwing on
error.
retries: The number of times to try the command before giving up.
Defaults to 1.
shell: Indicate that this is a shell command.
stdin: If not None, the stream from which the command should take its
input, defaults to None.
strip: If True, strip leading and trailing whitespace from the
command output before returning it.
Exceptions:
CommandError: if the command failed and noThrow is False
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runCommand s c K s~ d } | j d t � } x; | D]3 } y t | | � SWq t k
rQ } | } q Xq W| re d } n | d k rz | � n d S( s$ Try each of a series of commands in turn until one succeeds. If all the
commands fail, give up and raise an exception.
Arguments:
commands: A list of command lists
Keyword Arguments:
Supports all of the arguments which may be passed to runCommand().
Returns:
the output of the first successful command
Exceptions:
CommandError: if none of the commands succeeds and the noThrow keyword
option is False (or omitted); the error will be the one
raised by the last command in the list
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