source not displayed (linecache filename mismatch)

[dccarson]

I'm debugging a Python 3 script, which I typically invoke from the directory it lives in, as:

./fooBar.py parm1

If I instrument my script with a set_trace() call and start the script as above, it hits the breakpoint and stops. However, no source code is displayed. If, on the other hand, I enter the debugger from the command line, as:

python3 -m pudb fooBar.py parm1

and then hit continue, the source is displayed when I reach the set_trace() call.

Things to note:

• The filename is mixed case, as in my examples above.
• I am running this on Linux.
• The file is on a network storage device (netApp), not local to my Linux server.
• The linecache key for the filename in the non-working case is ./fooBar.py as would be expected. Apparently, the filename used when looking up the file upon encountering the breakpoint is not exactly the same.
• If, instead of using the relative path to invoke the script from the command line (e.g., ./fooBar.py), I use the absolute path (e.g., $PWD/fooBar.py), it hits the breakpoint and displays the source as it should.

[asmeurer]

There was a discussion on the mailing list with some thoughts about what might be causing this, but no concrete answers https://lists.tiker.net/hyperkitty/list/pudb@tiker.net/thread/JPH5S5KZBGRUJPSHPA7JXHPDYERLNTVQ/