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#
# executable.py -- Utilities for dealing with external executables
#
import os, string
def exists(file):
"""Is this an executable file?"""
return os.path.isfile(file) and os.access(file, os.X_OK)
def find(file, dirs=None):
"""Search for an executable in a given list of directories.
If no directories are given, search according to the PATH
environment variable."""
if not dirs:
dirs = string.split(os.environ["PATH"], os.pathsep)
for path in dirs:
if is_executable(os.path.join(path, file)):
return os.path.join(path, file)
elif is_executable(os.path.join(path, "%s.exe" % file)):
return os.path.join(path, "%s.exe" % file)
return None
def output(cmd, strip=None):
"""Run a command and collect all output"""
try:
# Python 2.x
stdin, stdout = os.popen4(cmd)
assert(not stdin.close())
except AttributeError:
try:
# Python 1.x on Unix
import posix
stdout = posix.popen('%s 2>&1' % cmd)
except ImportError:
# Python 1.x on Windows (no cygwin)
# There's no easy way to collect output from stderr, so we'll
# just collect stdout.
stdout = os.popen(cmd)
output = stdout.read()
assert(not stdout.close())
if strip:
return string.strip(output)
else:
return output
def run(cmd):
"""Run a command"""
exit_code = os.system(cmd)
assert(not exit_code)
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