Use the execWith* methods from Anaconda
The previous ones were a bit of a kludge, the Anaconda ones have had a lot of work put into them so let's just use them with slight modifications.
This commit is contained in:
Brian C. Lane
parent
de0e662f51
commit
e1a05d962c
@ -17,401 +17,211 @@
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Author(s): Erik Troan <ewt@redhat.com>
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#
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import os, sys
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import io
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import os
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import subprocess
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import threading
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import signal
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from time import sleep
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import logging
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log = logging.getLogger("pylorax")
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program_log = logging.getLogger("program")
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from threading import Lock
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program_log_lock = Lock()
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_child_env = {}
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def setenv(name, value):
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""" Set an environment variable to be used by child processes.
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This method does not modify os.environ for the running process, which
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is not thread-safe. If setenv has already been called for a particular
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variable name, the old value is overwritten.
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:param str name: The name of the environment variable
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:param str value: The value of the environment variable
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"""
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_child_env[name] = value
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def augmentEnv():
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env = os.environ.copy()
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env.update(_child_env)
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return env
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class ExecProduct(object):
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def __init__(self, rc, stdout, stderr):
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self.rc = rc
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self.stdout = stdout
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self.stderr = stderr
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class tee(threading.Thread):
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""" Python reimplementation of the shell tee process, so we can
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feed the pipe output into two places at the same time
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def startProgram(argv, root='/', stdin=None, stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
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env_prune=None, env_add=None, reset_handlers=True, reset_lang=True, **kwargs):
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""" Start an external program and return the Popen object.
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The root and reset_handlers arguments are handled by passing a
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preexec_fn argument to subprocess.Popen, but an additional preexec_fn
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can still be specified and will be run. The user preexec_fn will be run
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last.
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:param argv: The command to run and argument
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:param root: The directory to chroot to before running command.
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:param stdin: The file object to read stdin from.
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:param stdout: The file object to write stdout to.
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:param stderr: The file object to write stderr to.
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:param env_prune: environment variables to remove before execution
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:param env_add: environment variables to add before execution
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:param reset_handlers: whether to reset to SIG_DFL any signal handlers set to SIG_IGN
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:param reset_lang: whether to set the locale of the child process to C
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:param kwargs: Additional parameters to pass to subprocess.Popen
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:return: A Popen object for the running command.
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"""
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def __init__(self, inputdesc, outputdesc, logmethod, command):
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threading.Thread.__init__(self)
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self.inputdesc = os.fdopen(inputdesc, "r")
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self.outputdesc = outputdesc
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self.logmethod = logmethod
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self.running = True
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self.command = command
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if env_prune is None:
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env_prune = []
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def run(self):
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while self.running:
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try:
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data = self.inputdesc.readline()
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except IOError:
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self.logmethod("Can't read from pipe during a call to %s. "
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"(program terminated suddenly?)" % self.command)
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break
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if data == "":
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self.running = False
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else:
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self.logmethod(data.rstrip('\n'))
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os.write(self.outputdesc, data)
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# Check for and save a preexec_fn argument
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preexec_fn = kwargs.pop("preexec_fn", None)
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def stop(self):
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self.running = False
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return self
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def preexec():
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# If a target root was specificed, chroot into it
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if root and root != '/':
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os.chroot(root)
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os.chdir("/")
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def execWithRedirect(command, argv, stdin = None, stdout = None,
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stderr = None, root = None, preexec_fn=None, cwd=None,
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raise_err=False, callback=None):
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""" Run an external program and redirect the output to a file.
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@param command The command to run.
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@param argv A list of arguments.
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@param stdin The file descriptor to read stdin from.
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@param stdout The file descriptor to redirect stdout to.
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@param stderr The file descriptor to redirect stderr to.
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@param root The directory to chroot to before running command.
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@param preexec_fn function to pass to Popen
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@param cwd working directory to pass to Popen
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@param raise_err raise CalledProcessError when the returncode is not 0
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@param callback method to call while waiting for process to exit.
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@return The return code of command.
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# Signal handlers set to SIG_IGN persist across exec. Reset
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# these to SIG_DFL if requested. In particular this will include the
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# SIGPIPE handler set by python.
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if reset_handlers:
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for signum in range(1, signal.NSIG):
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if signal.getsignal(signum) == signal.SIG_IGN:
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signal.signal(signum, signal.SIG_DFL)
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The callback is passed the Popen object. It should return False if
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the polling loop should be exited.
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# If the user specified an additional preexec_fn argument, run it
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if preexec_fn is not None:
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preexec_fn()
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with program_log_lock:
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program_log.info("Running... %s", " ".join(argv))
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env = augmentEnv()
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for var in env_prune:
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env.pop(var, None)
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if reset_lang:
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env.update({"LC_ALL": "C"})
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if env_add:
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env.update(env_add)
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return subprocess.Popen(argv,
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stdin=stdin,
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stdout=stdout,
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stderr=stderr,
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close_fds=True,
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preexec_fn=preexec, cwd=root, env=env, **kwargs)
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def _run_program(argv, root='/', stdin=None, stdout=None, env_prune=None, log_output=True,
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binary_output=False, filter_stderr=False, raise_err=False, callback=None):
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""" Run an external program, log the output and return it to the caller
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:param argv: The command to run and argument
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:param root: The directory to chroot to before running command.
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:param stdin: The file object to read stdin from.
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:param stdout: Optional file object to write the output to.
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:param env_prune: environment variable to remove before execution
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:param log_output: whether to log the output of command
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:param binary_output: whether to treat the output of command as binary data
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:param filter_stderr: whether to exclude the contents of stderr from the returned output
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:param raise_err: whether to raise a CalledProcessError if the returncode is non-zero
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:param callback: method to call while waiting for process to finish, passed Popen object
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:return: The return code of the command and the output
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:raises: OSError or CalledProcessError
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"""
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def chroot ():
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os.chroot(root)
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stdinclose = stdoutclose = stderrclose = lambda : None
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argv = list(argv)
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if isinstance(stdin, str):
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if os.access(stdin, os.R_OK):
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stdin = os.open(stdin, os.O_RDONLY)
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stdinclose = lambda : os.close(stdin)
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else:
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stdin = sys.stdin.fileno()
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elif isinstance(stdin, int):
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pass
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elif stdin is None or not isinstance(stdin, io.IOBase):
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stdin = sys.stdin.fileno()
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if isinstance(stdout, str):
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stdout = os.open(stdout, os.O_RDWR|os.O_CREAT)
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stdoutclose = lambda : os.close(stdout)
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elif isinstance(stdout, int):
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pass
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elif stdout is None or not isinstance(stdout, io.IOBase):
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stdout = sys.stdout.fileno()
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if isinstance(stderr, str):
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stderr = os.open(stderr, os.O_RDWR|os.O_CREAT)
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stderrclose = lambda : os.close(stderr)
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elif isinstance(stderr, int):
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pass
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elif stderr is None or not isinstance(stderr, io.IOBase):
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stderr = sys.stderr.fileno()
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program_log.info("Running... %s", " ".join([command] + argv))
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#prepare os pipes for feeding tee proceses
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pstdout, pstdin = os.pipe()
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perrout, perrin = os.pipe()
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env = os.environ.copy()
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env.update({"LC_ALL": "C"})
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if root:
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preexec_fn = chroot
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cwd = root
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program_log.info("chrooting into %s", cwd)
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elif cwd:
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program_log.info("chdiring into %s", cwd)
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try:
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#prepare tee proceses
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proc_std = tee(pstdout, stdout, program_log.info, command)
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proc_err = tee(perrout, stderr, program_log.error, command)
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if filter_stderr:
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stderr = subprocess.PIPE
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else:
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stderr = subprocess.STDOUT
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#start monitoring the outputs
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proc_std.start()
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proc_err.start()
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proc = subprocess.Popen([command] + argv, stdin=stdin,
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stdout=pstdin,
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stderr=perrin,
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preexec_fn=preexec_fn, cwd=cwd,
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env=env)
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proc = startProgram(argv, root=root, stdin=stdin, stdout=subprocess.PIPE, stderr=stderr,
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env_prune=env_prune, universal_newlines=not binary_output)
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if callback:
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while callback(proc) and proc.poll() is None:
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sleep(1)
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proc.wait()
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ret = proc.returncode
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#close the input ends of pipes so we get EOF in the tee processes
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os.close(pstdin)
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os.close(perrin)
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(output_string, err_string) = proc.communicate()
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if output_string:
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if binary_output:
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output_lines = [output_string]
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else:
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if output_string[-1] != "\n":
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output_string = output_string + "\n"
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output_lines = output_string.splitlines(True)
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#wait for the output to be written and destroy them
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proc_std.join()
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del proc_std
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if log_output:
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with program_log_lock:
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for line in output_lines:
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program_log.info(line.strip())
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proc_err.join()
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del proc_err
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if stdout:
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stdout.write(output_string)
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# If stderr was filtered, log it separately
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if filter_stderr and err_string and log_output:
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err_lines = err_string.splitlines(True)
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with program_log_lock:
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for line in err_lines:
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program_log.info(line.strip())
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stdinclose()
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stdoutclose()
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stderrclose()
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except OSError as e:
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errstr = "Error running %s: %s" % (command, e.strerror)
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log.error(errstr)
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program_log.error(errstr)
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#close the input ends of pipes so we get EOF in the tee processes
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os.close(pstdin)
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os.close(perrin)
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proc_std.join()
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proc_err.join()
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with program_log_lock:
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program_log.error("Error running %s: %s", argv[0], e.strerror)
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raise
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stdinclose()
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stdoutclose()
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stderrclose()
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raise RuntimeError(errstr)
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with program_log_lock:
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program_log.debug("Return code: %d", proc.returncode)
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if ret and raise_err:
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raise subprocess.CalledProcessError(ret, [command]+argv)
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return ret
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def execWithCapture(command, argv, stdin = None, stderr = None, root=None,
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preexec_fn=None, cwd=None, raise_err=False):
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""" Run an external program and capture standard out.
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@param command The command to run.
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@param argv A list of arguments.
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@param stdin The file descriptor to read stdin from.
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@param stderr The file descriptor to redirect stderr to.
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@param root The directory to chroot to before running command.
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@param preexec_fn function to pass to Popen
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@param cwd working directory to pass to Popen
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@param raise_err raise CalledProcessError when the returncode is not 0
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@return The output of command from stdout.
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"""
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def chroot():
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os.chroot(root)
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def closefds ():
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stdinclose()
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stderrclose()
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stdinclose = stderrclose = lambda : None
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rc = ""
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argv = list(argv)
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if isinstance(stdin, str):
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if os.access(stdin, os.R_OK):
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stdin = os.open(stdin, os.O_RDONLY)
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stdinclose = lambda : os.close(stdin)
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else:
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stdin = sys.stdin.fileno()
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elif isinstance(stdin, int):
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pass
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elif stdin is None or not isinstance(stdin, io.IOBase):
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stdin = sys.stdin.fileno()
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if isinstance(stderr, str):
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stderr = os.open(stderr, os.O_RDWR|os.O_CREAT)
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stderrclose = lambda : os.close(stderr)
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elif isinstance(stderr, int):
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pass
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elif stderr is None or not isinstance(stderr, io.IOBase):
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stderr = sys.stderr.fileno()
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program_log.info("Running... %s", " ".join([command] + argv))
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env = os.environ.copy()
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env.update({"LC_ALL": "C"})
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if root:
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preexec_fn = chroot
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cwd = root
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program_log.info("chrooting into %s", cwd)
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elif cwd:
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program_log.info("chdiring into %s", cwd)
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try:
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proc = subprocess.Popen([command] + argv, stdin=stdin,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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preexec_fn=preexec_fn, cwd=cwd,
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env=env)
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while True:
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(outStr, errStr) = proc.communicate()
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if outStr:
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list(program_log.info(line) for line in outStr.splitlines())
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rc += outStr
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if errStr:
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list(program_log.error(line) for line in errStr.splitlines())
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os.write(stderr, errStr)
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if proc.returncode is not None:
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break
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except OSError as e:
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log.error("Error running %s: %s", command, e.strerror)
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closefds()
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raise RuntimeError("Error running %s: %s" % (command, e.strerror))
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closefds()
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if proc.returncode and raise_err:
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raise subprocess.CalledProcessError(proc.returncode, [command]+argv)
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raise subprocess.CalledProcessError(proc.returncode, argv)
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return rc
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return (proc.returncode, output_string)
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def execWithCallback(command, argv, stdin = None, stdout = None,
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stderr = None, echo = True, callback = None,
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callback_data = None, root = '/'):
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def closefds ():
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stdinclose()
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stdoutclose()
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stderrclose()
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def execWithRedirect(command, argv, stdin=None, stdout=None, root='/', env_prune=None,
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log_output=True, binary_output=False, raise_err=False, callback=None):
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""" Run an external program and redirect the output to a file.
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:param command: The command to run
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:param argv: The argument list
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:param stdin: The file object to read stdin from.
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:param stdout: Optional file object to redirect stdout and stderr to.
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:param root: The directory to chroot to before running command.
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:param env_prune: environment variable to remove before execution
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:param log_output: whether to log the output of command
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:param binary_output: whether to treat the output of command as binary data
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:param raise_err: whether to raise a CalledProcessError if the returncode is non-zero
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:param callback: method to call while waiting for process to finish, passed Popen object
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:return: The return code of the command
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"""
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argv = [command] + list(argv)
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return _run_program(argv, stdin=stdin, stdout=stdout, root=root, env_prune=env_prune,
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log_output=log_output, binary_output=binary_output, raise_err=raise_err, callback=callback)[0]
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stdinclose = stdoutclose = stderrclose = lambda : None
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argv = list(argv)
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if isinstance(stdin, str):
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if os.access(stdin, os.R_OK):
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stdin = os.open(stdin, os.O_RDONLY)
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stdinclose = lambda : os.close(stdin)
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else:
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stdin = sys.stdin.fileno()
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elif isinstance(stdin, int):
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pass
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elif stdin is None or not isinstance(stdin, io.IOBase):
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stdin = sys.stdin.fileno()
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if isinstance(stdout, str):
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stdout = os.open(stdout, os.O_RDWR|os.O_CREAT)
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stdoutclose = lambda : os.close(stdout)
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elif isinstance(stdout, int):
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pass
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elif stdout is None or not isinstance(stdout, io.IOBase):
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stdout = sys.stdout.fileno()
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if isinstance(stderr, str):
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stderr = os.open(stderr, os.O_RDWR|os.O_CREAT)
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stderrclose = lambda : os.close(stderr)
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elif isinstance(stderr, int):
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pass
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elif stderr is None or not isinstance(stderr, io.IOBase):
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stderr = sys.stderr.fileno()
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program_log.info("Running... %s", " ".join([command] + argv))
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p = os.pipe()
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p_stderr = os.pipe()
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childpid = os.fork()
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if not childpid:
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os.close(p[0])
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os.close(p_stderr[0])
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os.dup2(p[1], 1)
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os.dup2(p_stderr[1], 2)
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os.dup2(stdin, 0)
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os.close(stdin)
|
||||
os.close(p[1])
|
||||
os.close(p_stderr[1])
|
||||
|
||||
os.execvp(command, [command] + argv)
|
||||
os._exit(1)
|
||||
|
||||
os.close(p[1])
|
||||
os.close(p_stderr[1])
|
||||
|
||||
log_output = ''
|
||||
while 1:
|
||||
try:
|
||||
s = os.read(p[0], 1)
|
||||
except OSError as e:
|
||||
if e.errno != 4:
|
||||
list(program_log.info(line) for line in log_output.splitlines())
|
||||
raise IOError(e.args)
|
||||
|
||||
if echo:
|
||||
os.write(stdout, s)
|
||||
log_output += s
|
||||
|
||||
if callback:
|
||||
callback(s, callback_data=callback_data)
|
||||
|
||||
# break out early if the sub-process changes status.
|
||||
# no need to flush the stream if the process has exited
|
||||
try:
|
||||
(pid, status) = os.waitpid(childpid,os.WNOHANG)
|
||||
if pid != 0:
|
||||
break
|
||||
except OSError as e:
|
||||
log.critical("exception from waitpid: %s %s", e.errno, e.strerror)
|
||||
|
||||
if len(s) < 1:
|
||||
break
|
||||
|
||||
list(program_log.info(line) for line in log_output.splitlines())
|
||||
|
||||
log_errors = ''
|
||||
while 1:
|
||||
try:
|
||||
err = os.read(p_stderr[0], 128)
|
||||
except OSError as e:
|
||||
if e.errno != 4:
|
||||
list(program_log.error(line) for line in log_errors.splitlines())
|
||||
raise IOError(e.args)
|
||||
break
|
||||
log_errors += err
|
||||
if len(err) < 1:
|
||||
break
|
||||
|
||||
os.write(stderr, log_errors)
|
||||
list(program_log.error(line) for line in log_errors.splitlines())
|
||||
os.close(p[0])
|
||||
os.close(p_stderr[0])
|
||||
|
||||
try:
|
||||
#if we didn't already get our child's exit status above, do so now.
|
||||
if not pid:
|
||||
(pid, status) = os.waitpid(childpid, 0)
|
||||
except OSError as e:
|
||||
log.critical("exception from waitpid: %s %s", e.errno, e.strerror)
|
||||
|
||||
closefds()
|
||||
|
||||
rc = 1
|
||||
if os.WIFEXITED(status):
|
||||
rc = os.WEXITSTATUS(status)
|
||||
return ExecProduct(rc, log_output , log_errors)
|
||||
|
||||
def _pulseProgressCallback(data, callback_data=None):
|
||||
if callback_data:
|
||||
callback_data.pulse()
|
||||
|
||||
def execWithPulseProgress(command, argv, stdin = None, stdout = None,
|
||||
stderr = None, echo = True, progress = None,
|
||||
root = '/'):
|
||||
return execWithCallback(command, argv, stdin=stdin, stdout=stdout,
|
||||
stderr=stderr, echo=echo, callback=_pulseProgressCallback,
|
||||
callback_data=progress, root=root)
|
||||
|
||||
## Run a shell.
|
||||
def execConsole():
|
||||
try:
|
||||
proc = subprocess.Popen(["/bin/sh"])
|
||||
proc.wait()
|
||||
except OSError as e:
|
||||
raise RuntimeError("Error running /bin/sh: %s" % e.strerror)
|
||||
def execWithCapture(command, argv, stdin=None, root='/', log_output=True, filter_stderr=False,
|
||||
raise_err=False, callback=None):
|
||||
""" Run an external program and capture standard out and err.
|
||||
:param command: The command to run
|
||||
:param argv: The argument list
|
||||
:param stdin: The file object to read stdin from.
|
||||
:param root: The directory to chroot to before running command.
|
||||
:param log_output: Whether to log the output of command
|
||||
:param filter_stderr: Whether stderr should be excluded from the returned output
|
||||
:param raise_err: whether to raise a CalledProcessError if the returncode is non-zero
|
||||
:return: The output of the command
|
||||
"""
|
||||
argv = [command] + list(argv)
|
||||
return _run_program(argv, stdin=stdin, root=root, log_output=log_output, filter_stderr=filter_stderr,
|
||||
raise_err=raise_err, callback=callback)[1]
|
||||
|
||||
def runcmd(cmd, **kwargs):
|
||||
""" run execWithRedirect with raise_err=True
|
||||
@ -424,4 +234,3 @@ def runcmd_output(cmd, **kwargs):
|
||||
"""
|
||||
kwargs["raise_err"] = True
|
||||
return execWithCapture(cmd[0], cmd[1:], **kwargs)
|
||||
|
||||
|
||||
@ -220,8 +220,8 @@ def copytree(src, dest, preserve=True):
|
||||
raises CalledProcessError if copy fails.'''
|
||||
logger.debug("copytree %s %s", src, dest)
|
||||
cp = ["cp", "-a"] if preserve else ["cp", "-R", "-L"]
|
||||
cp += [".", os.path.abspath(dest)]
|
||||
runcmd(cp, cwd=src)
|
||||
cp += [join(src, "."), os.path.abspath(dest)]
|
||||
runcmd(cp)
|
||||
|
||||
def do_grafts(grafts, dest, preserve=True):
|
||||
'''Copy each of the items listed in grafts into dest.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user