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Newsgroups: comp.lang.python
Date: Mon, 17 Dec 2012 12:56:50 -0800 (PST)
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Subject: Re: os.system and subprocess odd behavior
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Xref: csiph.com comp.lang.python:35013

Oscar, seems you may be correct.  I need to run this program as a superuser=
.  However, after some more tests with simple commands...  I seem to be wor=
king correctly from any permission level in python.... Except for the outpu=
t write command from the database to a file.  Which runs fine if I paste it=
 into the cmd line.  Also, subprocess.call_check() returns clean.  However,=
 nothing is written to the output file when called from python.

so this cmd runs great from the cmd line (sudo or no) however the output fi=
le in this case is owned by the sysadmin either way... not root?

/usr/local/Calpont/mysql/bin/mysql --defaults-file=3D/usr/local/Calpont/mys=
ql/my.cnf -u root myDB < /home/myusr/jobs/APP_JOBS/JOB_XXX.SQL > /home/myus=
r/jobs/APP_JOBS/JOB_XXX.TXT


When run from sudo python (other files are also created and owned by root c=
orrectly)  however no output is written from the db command zero byte file =
only (owned by root)... returns to python with no errors.

I'm sorta at a loss.  I'd rather still avoid having python connect to the d=
b directly or reading the data from stdout, is a waste or mem and time for =
what I need.

Thanks for any more thoughts.

>=20
> Because of the root permissions on the file? What happens if you write
>=20
> to a file that doesn't need privileged access?
>=20
>=20
>=20
> Instead of running the "exact command", run the cat commands you
>=20
> posted (that Steven has confirmed as working) and run them somewhere
>=20
> in your user directory without root permissions.
>=20
>=20
>=20
> Also you may want to use subprocess.check_call as this raises a Python
>=20
> error if the command returns an error code.
>=20
>=20
>=20
>=20
>=20
> Oscar