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#! /usr/bin/env python3
"""
Illustrate how to override a class method to do something
In this case, print the commands being executed as strings
(the commands are usually lists, so this can be misleading)
"""
from waflib import Context, Utils, Logs
def exec_command(self, cmd, **kw):
subprocess = Utils.subprocess
kw['shell'] = isinstance(cmd, str)
txt = cmd
if isinstance(cmd, list):
txt = ' '.join(cmd)
print(txt)
Logs.debug('runner_env: kw=%s' % kw)
try:
if self.logger:
# warning: may deadlock with a lot of output (subprocess limitation)
self.logger.info(cmd)
kw['stdout'] = kw['stderr'] = subprocess.PIPE
p = subprocess.Popen(cmd, **kw)
(out, err) = p.communicate()
if out:
self.logger.debug('out: %s' % out.decode(sys.stdout.encoding or 'iso8859-1'))
if err:
self.logger.error('err: %s' % err.decode(sys.stdout.encoding or 'iso8859-1'))
return p.returncode
else:
p = subprocess.Popen(cmd, **kw)
return p.wait()
except OSError:
return -1
Context.Context.exec_command = exec_command
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