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84 lines
2.2 KiB
84 lines
2.2 KiB
"""Execute shell commands via os.popen() and return status, output. |
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Interface summary: |
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import commands |
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outtext = commands.getoutput(cmd) |
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(exitstatus, outtext) = commands.getstatusoutput(cmd) |
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outtext = commands.getstatus(file) # returns output of "ls -ld file" |
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A trailing newline is removed from the output string. |
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Encapsulates the basic operation: |
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pipe = os.popen('{ ' + cmd + '; } 2>&1', 'r') |
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text = pipe.read() |
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sts = pipe.close() |
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[Note: it would be nice to add functions to interpret the exit status.] |
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""" |
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__all__ = ["getstatusoutput","getoutput","getstatus"] |
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# Module 'commands' |
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# |
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# Various tools for executing commands and looking at their output and status. |
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# |
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# NB This only works (and is only relevant) for UNIX. |
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# Get 'ls -l' status for an object into a string |
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# |
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def getstatus(file): |
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"""Return output of "ls -ld <file>" in a string.""" |
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return getoutput('ls -ld' + mkarg(file)) |
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# Get the output from a shell command into a string. |
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# The exit status is ignored; a trailing newline is stripped. |
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# Assume the command will work with '{ ... ; } 2>&1' around it.. |
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# |
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def getoutput(cmd): |
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"""Return output (stdout or stderr) of executing cmd in a shell.""" |
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return getstatusoutput(cmd)[1] |
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# Ditto but preserving the exit status. |
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# Returns a pair (sts, output) |
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# |
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def getstatusoutput(cmd): |
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"""Return (status, output) of executing cmd in a shell.""" |
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import os |
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pipe = os.popen('{ ' + cmd + '; } 2>&1', 'r') |
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text = pipe.read() |
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sts = pipe.close() |
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if sts is None: sts = 0 |
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if text[-1:] == '\n': text = text[:-1] |
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return sts, text |
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# Make command argument from directory and pathname (prefix space, add quotes). |
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# |
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def mk2arg(head, x): |
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import os |
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return mkarg(os.path.join(head, x)) |
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# Make a shell command argument from a string. |
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# Return a string beginning with a space followed by a shell-quoted |
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# version of the argument. |
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# Two strategies: enclose in single quotes if it contains none; |
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# otherwise, enclose in double quotes and prefix quotable characters |
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# with backslash. |
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# |
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def mkarg(x): |
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if '\'' not in x: |
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return ' \'' + x + '\'' |
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s = ' "' |
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for c in x: |
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if c in '\\$"`': |
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s = s + '\\' |
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s = s + c |
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s = s + '"' |
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return s
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