You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
85 lines
2.2 KiB
85 lines
2.2 KiB
14 years ago
|
"""Execute shell commands via os.popen() and return status, output.
|
||
|
|
|
||
|
|
Interface summary:
|
||
|
|
|
||
|
|
import commands
|
||
|
|
|
||
|
|
outtext = commands.getoutput(cmd)
|
||
|
|
(exitstatus, outtext) = commands.getstatusoutput(cmd)
|
||
|
|
outtext = commands.getstatus(file) # returns output of "ls -ld file"
|
||
|
|
|
||
|
|
A trailing newline is removed from the output string.
|
||
|
|
|
||
|
|
Encapsulates the basic operation:
|
||
|
|
|
||
|
|
pipe = os.popen('{ ' + cmd + '; } 2>&1', 'r')
|
||
|
|
text = pipe.read()
|
||
|
|
sts = pipe.close()
|
||
|
|
|
||
|
|
[Note: it would be nice to add functions to interpret the exit status.]
|
||
|
|
"""
|
||
|
|
|
||
|
|
__all__ = ["getstatusoutput","getoutput","getstatus"]
|
||
|
|
|
||
|
|
# Module 'commands'
|
||
|
|
#
|
||
|
|
# Various tools for executing commands and looking at their output and status.
|
||
|
|
#
|
||
|
|
# NB This only works (and is only relevant) for UNIX.
|
||
|
|
|
||
|
|
|
||
|
|
# Get 'ls -l' status for an object into a string
|
||
|
|
#
|
||
|
|
def getstatus(file):
|
||
|
|
"""Return output of "ls -ld <file>" in a string."""
|
||
|
|
return getoutput('ls -ld' + mkarg(file))
|
||
|
|
|
||
|
|
|
||
|
|
# Get the output from a shell command into a string.
|
||
|
|
# The exit status is ignored; a trailing newline is stripped.
|
||
|
|
# Assume the command will work with '{ ... ; } 2>&1' around it..
|
||
|
|
#
|
||
|
|
def getoutput(cmd):
|
||
|
|
"""Return output (stdout or stderr) of executing cmd in a shell."""
|
||
|
|
return getstatusoutput(cmd)[1]
|
||
|
|
|
||
|
|
|
||
|
|
# Ditto but preserving the exit status.
|
||
|
|
# Returns a pair (sts, output)
|
||
|
|
#
|
||
|
|
def getstatusoutput(cmd):
|
||
|
|
"""Return (status, output) of executing cmd in a shell."""
|
||
|
|
import os
|
||
|
|
pipe = os.popen('{ ' + cmd + '; } 2>&1', 'r')
|
||
|
|
text = pipe.read()
|
||
|
|
sts = pipe.close()
|
||
|
|
if sts is None: sts = 0
|
||
|
|
if text[-1:] == '\n': text = text[:-1]
|
||
|
|
return sts, text
|
||
|
|
|
||
|
|
|
||
|
|
# Make command argument from directory and pathname (prefix space, add quotes).
|
||
|
|
#
|
||
|
|
def mk2arg(head, x):
|
||
|
|
import os
|
||
|
|
return mkarg(os.path.join(head, x))
|
||
|
|
|
||
|
|
|
||
|
|
# Make a shell command argument from a string.
|
||
|
|
# Return a string beginning with a space followed by a shell-quoted
|
||
|
|
# version of the argument.
|
||
|
|
# Two strategies: enclose in single quotes if it contains none;
|
||
|
|
# otherwise, enclose in double quotes and prefix quotable characters
|
||
|
|
# with backslash.
|
||
|
|
#
|
||
|
|
def mkarg(x):
|
||
|
|
if '\'' not in x:
|
||
|
|
return ' \'' + x + '\''
|
||
|
|
s = ' "'
|
||
|
|
for c in x:
|
||
|
|
if c in '\\$"`':
|
||
|
|
s = s + '\\'
|
||
|
|
s = s + c
|
||
|
|
s = s + '"'
|
||
|
|
return s
|