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stdout.txt starts with 292K of NULL bytes after first output #18

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elcojacobs opened this issue Oct 26, 2013 · 0 comments

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elcojacobs commented Oct 26, 2013

Steps to reproduce:

Let brewpi start with the default CRON command from brewpi.cron:

* * * * * brewpi python /home/brewpi/brewpi.py --checkstartuponly --dontrunfile; [ $? != 0 ] && python -u /home/brewpi/brewpi.py 1>/home/brewpi/logs/stdout.txt 2>>/home/brewpi/logs/stderr.txt &

Erase the logs with the button in the web interface.
Check file size of log files, stdout.txt should be 0 bytes.
Wait for first data point to be logged.
Check file size again: 292K
Check content of stdout.txt with cat -A stdout.txt

...
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Oct 26 2013 16:44:33  {"BeerTemp": 23.31,"BeerSet":null,"BeerAnn":null,"FridgeTemp": 23.25,"FridgeSet":null,"FridgeAnn":null,"State":0}^M$

This might be caused by python -u (unbuffered). It might not even be bad, but it is weird.

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