| 1 | # -*- Python -*- -*- coding: iso-8859-1 -*- |
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| 2 | # :Progetto: Bice -- Sync CVS->SVN |
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| 3 | # :Creato: sab 10 apr 2004 16:43:48 CEST |
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| 4 | # :Autore: Lele Gaifax <lele@nautilus.homeip.net> |
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| 5 | # |
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| 6 | |
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| 7 | __docformat__ = 'reStructuredText' |
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| 8 | |
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| 9 | from StringIO import StringIO |
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| 10 | from sys import stderr |
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| 11 | |
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| 12 | class VerboseStringIO(StringIO): |
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| 13 | |
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| 14 | def write(self, data): |
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| 15 | """Give a feedback to the user.""" |
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| 16 | |
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| 17 | StringIO.write(self, data) |
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| 18 | stderr.write('.'*data.count('\n')) |
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| 19 | |
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| 20 | |
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| 21 | class SystemCommand(object): |
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| 22 | """Wrap a single command to be executed by the shell.""" |
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| 23 | |
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| 24 | COMMAND = None |
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| 25 | """The default command for this class. Must be redefined by subclasses.""" |
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| 26 | |
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| 27 | VERBOSE = True |
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| 28 | """Print the executed command on stderr, at each run.""" |
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| 29 | |
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| 30 | def __init__(self, command=None, working_dir=None): |
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| 31 | """Initialize a SystemCommand instance, specifying the command |
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| 32 | to be executed and eventually the working directory.""" |
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| 33 | |
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| 34 | self.command = command or self.COMMAND |
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| 35 | """The command to be executed.""" |
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| 36 | |
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| 37 | self.working_dir = working_dir |
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| 38 | """The working directory, go there before execution.""" |
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| 39 | |
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| 40 | self.exit_status = None |
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| 41 | """Once the command has been executed, this is its exit status.""" |
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| 42 | |
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| 43 | def __call__(self, output=None, input=None, dry_run=False, **kwargs): |
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| 44 | """Execute the command.""" |
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| 45 | |
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| 46 | from os import system, popen, popen2, wait, chdir |
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| 47 | from shutil import copyfileobj |
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| 48 | |
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| 49 | wdir = self.working_dir or kwargs.get('working_dir') |
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| 50 | if wdir: |
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| 51 | chdir(wdir) |
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| 52 | |
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| 53 | command = self.command % kwargs |
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| 54 | if self.VERBOSE: |
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| 55 | stderr.write("%s " % command) |
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| 56 | |
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| 57 | if dry_run: |
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| 58 | if self.VERBOSE: |
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| 59 | stderr.write(" [dry run]\n") |
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| 60 | return |
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| 61 | |
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| 62 | if output: |
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| 63 | if output is True: |
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| 64 | if self.VERBOSE: |
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| 65 | output = VerboseStringIO() |
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| 66 | else: |
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| 67 | output = StringIO() |
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| 68 | |
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| 69 | if input: |
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| 70 | inp, out = popen2(command) |
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| 71 | inp.write(input) |
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| 72 | inp.close() |
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| 73 | else: |
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| 74 | out = popen(command) |
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| 75 | |
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| 76 | copyfileobj(out, output, length=128) |
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| 77 | output.seek(0) |
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| 78 | |
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| 79 | if input: |
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| 80 | self.exit_status = wait()[1] |
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| 81 | else: |
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| 82 | self.exit_status = out.close() |
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| 83 | else: |
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| 84 | if input: |
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| 85 | inp, out = popen2(command) |
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| 86 | inp.write(input) |
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| 87 | inp.close() |
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| 88 | out.close() |
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| 89 | self.exit_status = wait()[1] |
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| 90 | else: |
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| 91 | self.exit_status = system(command) |
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| 92 | |
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| 93 | if self.VERBOSE: |
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| 94 | if not self.exit_status: |
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| 95 | stderr.write(" [Ok]\n") |
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| 96 | else: |
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| 97 | stderr.write(" [Error %s]\n" % self.exit_status) |
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| 98 | |
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| 99 | return output |
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| 100 | |
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