[issue7757] sys.path is incorrect when prefix is ""

[Christian Heimes]

Christian Heimes  added the comment:

This is a very old bug report. Python has changed a lot in the past decade. 
Please reopen the bug if you still can reproduce the issue with Python 3.9 or 
newer.

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nosy: +christian.heimes
resolution:  -> out of date
stage:  -> resolved
status: open -> closed

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[issue7757] sys.path is incorrect when prefix is ""

[Phil Connell]

Changes by Phil Connell :


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nosy: +pconnell

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[issue7757] sys.path is incorrect when prefix is ""

[Mark Lawrence]

Changes by Mark Lawrence :


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nosy:  -BreamoreBoy

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[issue7757] sys.path is incorrect when prefix is ""

[Sunny K]

Sunny K added the comment:

I took a shot at this. Build is successful and imports happen. Tests are ok 
except test_sysconfig, and that is because of sys.prefix being set to '/'. I've 
raised issue19340 for that.

About the patch, i'm not sure how to completely test for false 
positives(joinpath now returns  if  is null). I could not 
think of any issues from the current calls to joinpath.

--
keywords: +patch
nosy: +sunfinite
Added file: http://bugs.python.org/file32293/getpath.patch

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[issue7757] sys.path is incorrect when prefix is ""

[Martin Matusiak]

Changes by Martin Matusiak :


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nosy: +numerodix

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[issue7757] sys.path is incorrect when prefix is ""

[Mark Lawrence]

Mark Lawrence added the comment:

There's so much detail provided that I think this should be easy for someone 
who understands C code.

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nosy: +BreamoreBoy

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[issue7757] sys.path is incorrect when prefix is ""

[Michael Smith]

Michael Smith  added the comment:

Yes, that does look related. The fix from Issue1676135 seems to handle 
--prefix="/" properly, and from what I can tell PREFIX does get set to "/".

There is also code in getpath.c to set sys.prefix to "/" if it's "".

The correct prefix for configure is actually "", not "/", to avoid 
double-slashes - but neither one seems to work at the moment.

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[issue7757] sys.path is incorrect when prefix is ""

[R. David Murray]

R. David Murray  added the comment:

I thought I remembered a bug that mentioned prefix="/".  What I found was 
Issue1676135, which might have something to do with your last question.

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nosy: +r.david.murray
priority:  -> normal

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[issue7757] sys.path is incorrect when prefix is ""

[Michael Smith]

New submission from Michael Smith :

I've built Python 2.6.2 with a prefix of "" for an embedded system, so it's 
installed into /bin/python, /lib/python2.6/, etc.

If I run a script with "python /tmp/script.py" or by putting in a #!/bin/python 
and executing it directly, sys.path is missing the leading slashes:

['/tmp', 'lib/python26.zip', 'lib/python2.6/', 'lib/python2.6/plat-linux2', 
'lib/python2.6/lib-tk', 'lib/python2.6/lib-old', 'lib/lib-dynload']

This causes all module imports to fail. I can work around this by making /usr a 
symlink to / and running the script as "/usr/bin/python /tmp/script.py", or by 
setting PYTHONHOME=/ before starting Python.

In Modules/getpath.c, search_for_prefix() calls reduce() on argv0_path at the 
end of a do-while loop, so "/bin" becomes "" and the loop terminates. Then 
there's a call to joinpath(PREFIX, "lib/python2.6"), where PREFIX is "", and 
this fails (no leading slash).

calculate_path() warns:

Could not find platform independent libraries 

and falls back to joinpath(PREFIX, "lib/python2.6") again, which still fails.

I was thinking I could work around it by building with prefix="/" instead of 
"", but the behaviour is the same - I don't know why, yet.

--
components: Interpreter Core
messages: 98152
nosy: msm...@cbnco.com
severity: normal
status: open
title: sys.path is incorrect when prefix is ""
type: behavior
versions: Python 2.6

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