Log files in dot-sage

[Andrey Novoseltsev]

Hello,

There are apparently log files written to .sage. This causes issues with SageMathCell which makes .sage immutable and there are commands that trigger creation of some of these files, but it looks like the list is growing, currently

print gp.eval("""5*6;""")

in a cell leads to

IOError: [Errno 13] Permission denied: '/home/sc_work/.sage/gp-expect.log'

My questions:
1) Why are such log files created there at all?
2) Why have things that didn't use them before started creating them now?
3) Is there a better solution to the problem than touching this file before making .sage immutable?

Thank you!
Andrey

[John Cremona]

On 26 May 2015 at 23:21, Andrey Novoseltsev <novo...@gmail.com> wrote:
> Hello,
>
> There are apparently log files written to .sage. This causes issues with
> SageMathCell which makes .sage immutable and there are commands that trigger
> creation of some of these files, but it looks like the list is growing,
> currently
>
> print gp.eval("""5*6;""")
>
> in a cell leads to
>
> IOError: [Errno 13] Permission denied: '/home/sc_work/.sage/gp-expect.log'

The gp instance should be created with no log file by default, as with
all pexpect interfaces. But in the file sage/interfaces/gp.py are
the lines

# An instance
gp = Gp(logfile=os.path.join(DOT_SAGE,'gp-expect.log')) # useful for debugging!

which create the global instance *with* a log file. This should be
changed -- users can create more instances if they want to, with log
files. My guess is that this is a left-over from some debugging
session. I'll let others do the "git blame" in case it was me.

Replacing that line with gp=Gp() will sort that out.

John

>
> My questions:
> 1) Why are such log files created there at all?
> 2) Why have things that didn't use them before started creating them now?
> 3) Is there a better solution to the problem than touching this file before
> making .sage immutable?
>
> Thank you!
> Andrey
>

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[Volker Braun]

There is the SAGE_PEXPECT_LOG environment variable, it would IMHO be reasonable to also use it to switch logging on or off.