File: pbs.py

package info (click to toggle)
livestreamer 1.10.2-1
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 1,828 kB
  • ctags: 2,390
  • sloc: python: 13,370; makefile: 135
file content (454 lines) | stat: -rw-r--r-- 14,376 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
#===============================================================================
# Copyright (C) 2011-2012 by Andrew Moffat
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#===============================================================================



import subprocess as subp
import sys
import traceback
import os
import re
from glob import glob as original_glob
from types import ModuleType
from functools import partial
import warnings
import platform


__version__ = "0.110"
__project_url__ = "https://github.com/amoffat/pbs"

IS_PY3 = sys.version_info[0] == 3
if IS_PY3:
    raw_input = input
    unicode = str
else:
    pass

DEFAULT_ENCODING = "utf-8"

class ErrorReturnCode(Exception):
    truncate_cap = 200

    def __init__(self, full_cmd, stdout, stderr):
        self.full_cmd = full_cmd
        self.stdout = stdout
        self.stderr = stderr

        if self.stdout is None: tstdout = "<redirected>"
        else:
            tstdout = self.stdout[:self.truncate_cap]
            out_delta = len(self.stdout) - len(tstdout)
            if out_delta:
                tstdout += ("... (%d more, please see e.stdout)" % out_delta).encode()

        if self.stderr is None: tstderr = "<redirected>"
        else:
            tstderr = self.stderr[:self.truncate_cap]
            err_delta = len(self.stderr) - len(tstderr)
            if err_delta:
                tstderr += ("... (%d more, please see e.stderr)" % err_delta).encode()

        msg = "\n\nRan: %r\n\nSTDOUT:\n\n  %s\n\nSTDERR:\n\n  %s" %\
            (full_cmd, tstdout.decode(DEFAULT_ENCODING, "replace"),
             tstderr.decode(DEFAULT_ENCODING, "replace"))
        super(ErrorReturnCode, self).__init__(msg)

class CommandNotFound(Exception): pass

rc_exc_regex = re.compile("ErrorReturnCode_(\d+)")
rc_exc_cache = {}

def get_rc_exc(rc):
    rc = int(rc)
    try: return rc_exc_cache[rc]
    except KeyError: pass

    name = "ErrorReturnCode_%d" % rc
    exc = type(name, (ErrorReturnCode,), {})
    rc_exc_cache[rc] = exc
    return exc




def which(program):
    def is_exe(fpath):
        return os.path.exists(fpath) and os.access(fpath, os.X_OK)

    fpath, fname = os.path.split(program)
    if fpath:
        if is_exe(program): return program
    else:
        for path in os.environ["PATH"].split(os.pathsep):
            exe_file = os.path.join(path, program)
            if is_exe(exe_file):
                return exe_file

    return None

def resolve_program(program):
    path = which(program)
    if not path:
        # our actual command might have a dash in it, but we can't call
        # that from python (we have to use underscores), so we'll check
        # if a dash version of our underscore command exists and use that
        # if it does
        if "_" in program: path = which(program.replace("_", "-"))
        if not path: return None
    return path


def glob(arg):
    return original_glob(arg) or arg


def create_command(cmd):
    return Command._create(cmd)


class RunningCommand(object):
    def __init__(self, command_ran, process, call_args, stdin=None):
        self.command_ran = command_ran
        self.process = process
        self._stdout = None
        self._stderr = None
        self.call_args = call_args

        # we're running in the background, return self and let us lazily
        # evaluate
        if self.call_args["bg"]:
            return

        # we're running this command as a with context, don't do anything
        # because nothing was started to run from Command.__call__
        if self.call_args["with"]: return

        # run and block
        if stdin: stdin = stdin.encode(DEFAULT_ENCODING)
        self._stdout, self._stderr = self.process.communicate(stdin)
        self._handle_exit_code(self.process.wait())

    def __enter__(self):
        # we don't actually do anything here because anything that should
        # have been done would have been done in the Command.__call__ call.
        # essentially all that has to happen is the comand be pushed on
        # the prepend stack.
        pass

    def __exit__(self, typ, value, traceback):
        if self.call_args["with"] and Command._prepend_stack:
            Command._prepend_stack.pop()

    def __str__(self):
        if IS_PY3: return self.__unicode__()
        else: return unicode(self).encode(DEFAULT_ENCODING)

    def __unicode__(self):
        if self.process:
            if self.call_args["bg"]: self.wait()
            if self._stdout: return self.stdout()
            else: return ""

    def __eq__(self, other):
        return unicode(self) == unicode(other)
    __hash__ = None  # Avoid DeprecationWarning in Python < 3

    def __contains__(self, item):
        return item in str(self)

    def __getattr__(self, p):
        # let these three attributes pass through to the Popen object
        if p in ("send_signal", "terminate", "kill"):
            if self.process: return getattr(self.process, p)
            else: raise AttributeError
        return getattr(unicode(self), p)

    def __repr__(self):
        return "<RunningCommand %r, pid:%d, special_args:%r" % (
            self.command_ran, self.process.pid, self.call_args)

    def __long__(self):
        return long(str(self).strip())

    def __float__(self):
        return float(str(self).strip())

    def __int__(self):
        return int(str(self).strip())

    def stdout(self):
        if self.call_args["bg"]: self.wait()
        return self._stdout.decode(DEFAULT_ENCODING, "replace")

    def stderr(self):
        if self.call_args["bg"]: self.wait()
        return self._stderr.decode(DEFAULT_ENCODING, "replace")

    def wait(self):
        if self.process.returncode is not None: return
        self._stdout, self._stderr = self.process.communicate()
        self._handle_exit_code(self.process.wait())
        return str(self)

    def _handle_exit_code(self, rc):
        if rc not in self.call_args["ok_code"]:
            raise get_rc_exc(rc)(self.command_ran, self._stdout, self._stderr)

    def __len__(self):
        return len(str(self))




class Command(object):
    _prepend_stack = []

    call_args = {
        "fg": False, # run command in foreground
        "bg": False, # run command in background
        "with": False, # prepend the command to every command after it
        "out": None, # redirect STDOUT
        "err": None, # redirect STDERR
        "err_to_out": None, # redirect STDERR to STDOUT
        "in": None,
        "env": os.environ,
        "cwd": None,

        # this is for commands that may have a different exit status than the
        # normal 0.  this can either be an integer or a list/tuple of ints
        "ok_code": 0,
    }

    @classmethod
    def _create(cls, program):
        path = resolve_program(program)
        if not path: raise CommandNotFound(program)
        return cls(path)

    def __init__(self, path):
        self._path = path
        self._partial = False
        self._partial_baked_args = []
        self._partial_call_args = {}

    def __getattribute__(self, name):
        # convenience
        getattr = partial(object.__getattribute__, self)
        if name.startswith("_"): return getattr(name)
        if name == "bake": return getattr("bake")
        return getattr("bake")(name)


    @staticmethod
    def _extract_call_args(kwargs):
        kwargs = kwargs.copy()
        call_args = Command.call_args.copy()
        for parg, default in call_args.items():
            key = "_" + parg
            if key in kwargs:
                call_args[parg] = kwargs[key]
                del kwargs[key]
        return call_args, kwargs


    def _format_arg(self, arg):
        if IS_PY3:
            arg = str(arg)
        else:
            try:
                arg = unicode(arg, DEFAULT_ENCODING).encode(DEFAULT_ENCODING)
            except TypeError:
                arg = unicode(arg).encode(DEFAULT_ENCODING)

        if self._partial:
            escaped = arg.replace('"', '\\"')
            escaped = escaped.replace("$", "\$")
            escaped = escaped.replace("`", "\`")

            arg = '"{0}"'.format(escaped)

        return arg

    def _compile_args(self, args, kwargs):
        processed_args = []

        # aggregate positional args
        for arg in args:
            if isinstance(arg, (list, tuple)):
                if not arg:
                    warnings.warn("Empty list passed as an argument to %r. \
If you're using glob.glob(), please use pbs.glob() instead." % self.path, stacklevel=3)
                for sub_arg in arg: processed_args.append(self._format_arg(sub_arg))
            else: processed_args.append(self._format_arg(arg))

        # aggregate the keyword arguments
        for k,v in kwargs.items():
            # we're passing a short arg as a kwarg, example:
            # cut(d="\t")
            if len(k) == 1:
                processed_args.append("-"+k)
                if v is not True: processed_args.append(self._format_arg(v))

            # we're doing a long arg
            else:
                k = k.replace("_", "-")

                if v is True: processed_args.append("--"+k)
                else: processed_args.append("--%s=%s" % (k, self._format_arg(v)))

        return processed_args


    def bake(self, *args, **kwargs):
        fn = Command(self._path)
        fn._partial = True

        call_args, kwargs = self._extract_call_args(kwargs)

        pruned_call_args = call_args
        for k,v in Command.call_args.items():
            try:
                if pruned_call_args[k] == v:
                    del pruned_call_args[k]
            except KeyError: continue

        fn._partial_call_args.update(self._partial_call_args)
        fn._partial_call_args.update(pruned_call_args)
        fn._partial_baked_args.extend(self._partial_baked_args)
        fn._partial_baked_args.extend(fn._compile_args(args, kwargs))
        return fn

    def __str__(self):
        if IS_PY3: return self.__unicode__()
        else: return unicode(self).encode(DEFAULT_ENCODING)

    def __repr__(self):
        return str(self)

    def __unicode__(self):
        baked_args = " ".join(self._partial_baked_args)
        if baked_args: baked_args = " " + baked_args
        return self._path + baked_args

    def __eq__(self, other):
        try: return str(self) == str(other)
        except: return False
    __hash__ = None  # Avoid DeprecationWarning in Python < 3


    def __enter__(self):
        Command._prepend_stack.append([self._path])

    def __exit__(self, typ, value, traceback):
        Command._prepend_stack.pop()


    def __call__(self, *args, **kwargs):

        kwargs = kwargs.copy()
        args = list(args)

        cmd = []

        # aggregate any with contexts
        for prepend in self._prepend_stack: cmd.extend(prepend)

        cmd.append(self._path)


        call_args, kwargs = self._extract_call_args(kwargs)
        call_args.update(self._partial_call_args)


        # here we normalize the ok_code to be something we can do
        # "if return_code in call_args["ok_code"]" on
        if not isinstance(call_args["ok_code"], (tuple, list)):
            call_args["ok_code"] = [call_args["ok_code"]]

        # set pipe to None if we're outputting straight to CLI
        pipe = None if call_args["fg"] else subp.PIPE

        # check if we're piping via composition
        input_stream = pipe
        input_data = None
        if args:
            first_arg = args.pop(0)
            if isinstance(first_arg, RunningCommand):
                # it makes sense that if the input pipe of a command is running
                # in the background, then this command should run in the
                # background as well
                if first_arg.call_args["bg"]:
                    call_args["bg"] = True
                    input_stream = first_arg.process.stdout
                else:
                    input_data = first_arg.stdout()
            else: args.insert(0, first_arg)

        processed_args = self._compile_args(args, kwargs)

        # makes sure our arguments are broken up correctly
        split_args = self._partial_baked_args + processed_args
        final_args = split_args

        cmd.extend(final_args)
        command_ran = " ".join(cmd)


        # with contexts shouldn't run at all yet, they prepend
        # to every command in the context
        if call_args["with"]:
            Command._prepend_stack.append(cmd)
            return RunningCommand(command_ran, None, call_args)


        # stdin from string
        input = call_args["in"]
        if input:
            input_data = input

        # stdout redirection
        stdout = pipe
        out = call_args["out"]
        if out:
            if hasattr(out, "write"): stdout = out
            else: stdout = open(str(out), "w")

        # stderr redirection
        stderr = pipe
        err = call_args["err"]

        if err:
            if hasattr(err, "write"): stderr = err
            else: stderr = open(str(err), "w")

        if call_args["err_to_out"]: stderr = subp.STDOUT

        # leave shell=False
        process = subp.Popen(cmd, shell=False, env=call_args["env"],
            cwd=call_args["cwd"],
            stdin=input_stream, stdout=stdout, stderr=stderr)

        return RunningCommand(command_ran, process, call_args, input_data)