redirect to whatever stdout was redirected to.
"""
-class RUNNING:
+class ProcStatus:
"""
- Process is still running
+ Codes for status of remote spawned process
"""
+ # Process is still running
+ RUNNING = 1
-class FINISHED:
- """
- Process is finished
- """
-
-class NOT_STARTED:
- """
- Process hasn't started running yet (this should be very rare)
- """
+ # Process is finished
+ FINISHED = 2
+
+ # Process hasn't started running yet (this should be very rare)
+ NOT_STARTED = 3
hostbyname_cache = dict()
hostbyname_cache_lock = threading.Lock()
tmp_known_hosts = None
args = ['scp', '-q', '-p', '-C',
+ # Speed up transfer using blowfish cypher specification which is
+ # faster than the default one (3des)
+ '-c', 'blowfish',
# Don't bother with localhost. Makes test easier
'-o', 'NoHostAuthenticationForLocalhost=yes',
'-o', 'ConnectTimeout=60',
def rspawn(command, pidfile,
stdout = '/dev/null',
stderr = STDOUT,
- stdin = '/dev/null',
+ stdin = '/dev/null',
home = None,
create_home = False,
sudo = False,
server_key = None,
tty = False):
"""
- Spawn a remote command such that it will continue working asynchronously.
-
- Parameters:
- command: the command to run - it should be a single line.
-
- pidfile: path of a (ideally unique to this task) pidfile for tracking the process.
-
- stdout: path of a file to redirect standard output to - must be a string.
- Defaults to /dev/null
- stderr: path of a file to redirect standard error to - string or the special STDOUT value
- to redirect to the same file stdout was redirected to. Defaults to STDOUT.
- stdin: path of a file with input to be piped into the command's standard input
+ Spawn a remote command such that it will continue working asynchronously in
+ background.
+
+ :param command: The command to run, it should be a single line.
+ :type command: str
+
+ :param pidfile: Path to a file where to store the pid and ppid of the
+ spawned process
+ :type pidfile: str
+
+ :param stdout: Path to file to redirect standard output.
+ The default value is /dev/null
+ :type stdout: str
+
+ :param stderr: Path to file to redirect standard error.
+ If the special STDOUT value is used, stderr will
+ be redirected to the same file as stdout
+ :type stderr: str
+
+ :param stdin: Path to a file with input to be piped into the command's standard input
+ :type stdin: str
+
+ :param home: Path to working directory folder.
+ It is assumed to exist unless the create_home flag is set.
+ :type home: str
+
+ :param create_home: Flag to force creation of the home folder before
+ running the command
+ :type create_home: bool
+
+ :param sudo: Flag forcing execution with sudo user
+ :type sudo: bool
- home: path of a folder to use as working directory - should exist, unless you specify create_home
-
- create_home: if True, the home folder will be created first with mkdir -p
-
- sudo: whether the command needs to be executed as root
-
- host/port/user/agent/identity: see rexec
-
- Returns:
+ :rtype: touple
+
(stdout, stderr), process
Of the spawning process, which only captures errors at spawning time.
return ((out, err), proc)
@eintr_retry
-def rcheckpid(pidfile,
+def rgetpid(pidfile,
host = None,
port = None,
user = None,
identity = None,
server_key = None):
"""
- Check the pidfile of a process spawned with remote_spawn.
-
- Parameters:
- pidfile: the pidfile passed to remote_span
+ Returns the pid and ppid of a process from a remote file where the
+ information was stored.
+
+ :param home: Path to directory where the pidfile is located
+ :type home: str
+
+ :param pidfile: Name of file containing the pid information
+ :type pidfile: str
- host/port/user/agent/identity: see rexec
-
- Returns:
+ :rtype: int
- A (pid, ppid) tuple useful for calling remote_status and remote_kill,
- or None if the pidfile isn't valid yet (maybe the process is still starting).
- """
+ A (pid, ppid) tuple useful for calling rstatus and rkill,
+ or None if the pidfile isn't valid yet (can happen when process is staring up)
+ """
(out,err),proc = rexec(
"cat %(pidfile)s" % {
'pidfile' : pidfile,
identity = None,
server_key = None):
"""
- Check the status of a process spawned with remote_spawn.
+ Returns a code representing the the status of a remote process
+
+ :param pid: Process id of the process
+ :type pid: int
+
+ :param ppid: Parent process id of process
+ :type ppid: int
- Parameters:
- pid/ppid: pid and parent-pid of the spawned process. See remote_check_pid
-
- host/port/user/agent/identity: see rexec
+ :rtype: int (One of NOT_STARTED, RUNNING, FINISHED)
- Returns:
-
- One of NOT_STARTED, RUNNING, FINISHED
"""
-
(out,err),proc = rexec(
# Check only by pid. pid+ppid does not always work (especially with sudo)
" (( ps --pid %(pid)d -o pid | grep -c %(pid)d && echo 'wait') || echo 'done' ) | tail -n 1" % {
)
if proc.wait():
- return NOT_STARTED
+ return ProcStatus.NOT_STARTED
status = False
if err:
elif out:
status = (out.strip() == 'wait')
else:
- return NOT_STARTED
- return RUNNING if status else FINISHED
+ return ProcStatus.NOT_STARTED
+ return ProcStatus.RUNNING if status else ProcStatus.FINISHED
@eintr_retry
def rkill(pid, ppid,
server_key = None,
nowait = False):
"""
- Kill a process spawned with remote_spawn.
-
+ Sends a kill signal to a remote process.
+
First tries a SIGTERM, and if the process does not end in 10 seconds,
it sends a SIGKILL.
-
- Parameters:
- pid/ppid: pid and parent-pid of the spawned process. See remote_check_pid
-
- sudo: whether the command was run with sudo - careful killing like this.
-
- host/port/user/agent/identity: see rexec
-
- Returns:
+
+ :param pid: Process id of process to be killed
+ :type pid: int
+
+ :param ppid: Parent process id of process to be killed
+ :type ppid: int
+
+ :param sudo: Flag indicating if sudo should be used to kill the process
+ :type sudo: bool
- Nothing, should have killed the process
"""
-
subkill = "$(ps --ppid %(pid)d -o pid h)" % { 'pid' : pid }
cmd = """
SUBKILL="%(subkill)s" ;
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