Author: sebb
Date: Thu Oct 15 13:43:15 2015
New Revision: 1708820
URL: http://svn.apache.org/viewvc?rev=1708820&view=rev
Log:
Experimental file filter to tee stderr to stdout
Intended for use with cronjobs where we want stderr copied to the log as well
Added:
comdev/projects.apache.org/scripts/cronjobs/errtee.py (with props)
Added: comdev/projects.apache.org/scripts/cronjobs/errtee.py
URL:
http://svn.apache.org/viewvc/comdev/projects.apache.org/scripts/cronjobs/errtee.py?rev=1708820&view=auto
==============================================================================
--- comdev/projects.apache.org/scripts/cronjobs/errtee.py (added)
+++ comdev/projects.apache.org/scripts/cronjobs/errtee.py Thu Oct 15 13:43:15
2015
@@ -0,0 +1,36 @@
+"""
+ Class to copy stderr to stdout.
+
+ This is intended for use in cronjobs,
+ where it is useful to have both stderr and stdout in the log file
+ but still have stderr so that the mailer gets any errors
+ The main script should be run unbuffered (-u)
+
+ Unfortunately Python does not seem to offer the equivalent of:
+ perl -[mM][-]module execute "use/no module..." before executing program
+ ruby -rlibrary require the library before executing your script
+ lua -l name require library 'name'
+ Thus the module has to be explicitly imported by the user script,
+ and the user must defing the 'ERRTEE' environment variable to enable it
+
+"""
+import sys
+import os
+
+class ErrTee(object):
+ def write(self, buf):
+ sys.__stderr__.write(buf)
+ sys.stdout.write(buf)
+ def flush(self):
+ sys.__stderr__.flush()
+
+# only enable the override if it is needed
+if 'ERRTEE' in os.environ:
+ sys.stderr=ErrTee()
+
+if __name__ == '__main__': # simple test
+ print("STDOUT1")
+ print("STDERR2", file=sys.stderr)
+ sys.stderr=ErrTee() # enable for testing
+ print("STDERR3", file=sys.stderr)
+ raise Exception("STDERR4")
\ No newline at end of file
Propchange: comdev/projects.apache.org/scripts/cronjobs/errtee.py
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svn:eol-style = native
