bpo-20523: pdb searches for .pdbrc in ~ instead of $HOME #11847

tdhopper · 2019-02-13T22:11:39Z

Previously pdb checked the $HOME environmental variable
to find the user .pdbrc. If $HOME is not set, the user
.pdbrc would not be found.

Change pdb to use os.path.expanduser('~') to determine
the user's home directory. Thus, if $HOME is not set (as
in tox or on Windows), os.path.expanduser('~') falls
back on other techniques for locating the user's home
directory.

This follows pip's implementation for loading .piprc.

Co-authored-by: Dan Lidral-Porter dlp@aperiodic.org

https://bugs.python.org/issue20523

the-knights-who-say-ni · 2019-02-13T22:11:41Z

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tdhopper · 2019-02-15T14:42:30Z

This also solves a problem we encountered trying to launch pdb (via pytest --pdb) from within tox. By default, tox strips out nearly all environmental variables, including $HOME. Thus, pdb fails to find $HOME/.pdbrc. This is different from loading the user pip config, because pip looks in expanduser("~") which falls back on the pwd module to find the home directory.

matrixise · 2019-02-15T15:06:19Z

Lib/pdb.py

-            if 'HOME' in os.environ:
-                envHome = os.environ['HOME']
+            envHome = os.path.expanduser('~')
+            if envHome != '~':


why do you test with '~' ? normally, you won't get the tilde but the full path. I have an other PR but you can check with my code and fix yours. #11855

envHome != '~' is true if expanduser succeeded in finding the full path.

yep, but in which case can you have '~' ? never

Your solution is cleaner. We took the approach of modifying the fewest lines.

in fact, expanduser will replace ~ by the $HOME, $HOMEDRIVE, $HOMEPATH, etc... for Windows and unix-like, so normally, you won't get the ~. my approach is different because I wait for an exception and sometimes, an exception is better than a condition.

You could have ~ if the expansion fails (e.g. if it can't find anything resembling a home directory): "If the expansion fails or if the path does not begin with a tilde, the path is returned unchanged."

yep, it's possible.

use python3 for the documentation (https://docs.python.org/3/library/os.path.html#os.path.expanduser)

if you can't read the file you will get an exception, in this case, you will get OSError or Exception.

Updated to use your cleaner solution

Previously pdb checked the $HOME environmental variable to find the user .pdbrc. If $HOME is not set, the user .pdbrc would not be found. Change pdb to use `os.path.expanduser('~')` to determine the user's home directory. Thus, if $HOME is not set (as in tox or on Windows), os.path.expanduser('~') falls back on other techniques for locating the user's home directory. This follows pip's implementation for loading .piprc. Co-authored-by: Dan Lidral-Porter <dlp@aperiodic.org>

matrixise · 2019-02-15T16:03:20Z

Lib/pdb.py

-                        self.rcLines.extend(rcFile)
-                except OSError:
-                    pass
+            try:


I think to an other solution:

for path in (os.path.expanduser('~/.pdbrc'), '.pdbrc'): with contextlib.suppress(OSError), open(path) as rcFile: self.rcLines.extend(rcFile)

but I am not sure. need to test it.

Requested changes were made

zooba · 2019-08-02T22:19:49Z

Sorry for the slow reviews, but I'm happy with this, so it can go in for the next releases!

miss-islington · 2019-08-02T22:20:25Z

Thanks @tdhopper for the PR, and @zooba for merging it 🌮🎉.. I'm working now to backport this PR to: 3.8.
🐍🍒⛏🤖

miss-islington · 2019-08-02T22:20:25Z

Thanks @tdhopper for the PR, and @zooba for merging it 🌮🎉.. I'm working now to backport this PR to: 3.7.
🐍🍒⛏🤖

miss-islington · 2019-08-02T22:20:26Z

I'm having trouble backporting to 3.8. Reason: 'Error 110 while writing to socket. Connection timed out.'. Please retry by removing and re-adding the needs backport to 3.8 label.

) Previously pdb checked the $HOME environmental variable to find the user .pdbrc. If $HOME is not set, the user .pdbrc would not be found. Change pdb to use `os.path.expanduser('~')` to determine the user's home directory. Thus, if $HOME is not set (as in tox or on Windows), os.path.expanduser('~') falls back on other techniques for locating the user's home directory. This follows pip's implementation for loading .piprc. Co-authored-by: Dan Lidral-Porter <dlp@aperiodic.org> (cherry picked from commit 7ea9a85) Co-authored-by: Timothy Hopper <tdhopper@users.noreply.github.com>

bedevere-bot · 2019-08-02T22:20:34Z

GH-15084 is a backport of this pull request to the 3.7 branch.

miss-islington · 2019-08-02T22:20:36Z

Thanks @tdhopper for the PR, and @zooba for merging it 🌮🎉.. I'm working now to backport this PR to: 3.7.
🐍🍒⛏🤖

miss-islington · 2019-08-02T22:20:46Z

Thanks @tdhopper for the PR, and @zooba for merging it 🌮🎉.. I'm working now to backport this PR to: 3.8.
🐍🍒⛏🤖

) Previously pdb checked the $HOME environmental variable to find the user .pdbrc. If $HOME is not set, the user .pdbrc would not be found. Change pdb to use `os.path.expanduser('~')` to determine the user's home directory. Thus, if $HOME is not set (as in tox or on Windows), os.path.expanduser('~') falls back on other techniques for locating the user's home directory. This follows pip's implementation for loading .piprc. Co-authored-by: Dan Lidral-Porter <dlp@aperiodic.org> (cherry picked from commit 7ea9a85) Co-authored-by: Timothy Hopper <tdhopper@users.noreply.github.com>

bedevere-bot · 2019-08-02T22:20:54Z

GH-15085 is a backport of this pull request to the 3.8 branch.

Previously pdb checked the $HOME environmental variable to find the user .pdbrc. If $HOME is not set, the user .pdbrc would not be found. Change pdb to use `os.path.expanduser('~')` to determine the user's home directory. Thus, if $HOME is not set (as in tox or on Windows), os.path.expanduser('~') falls back on other techniques for locating the user's home directory. This follows pip's implementation for loading .piprc. Co-authored-by: Dan Lidral-Porter <dlp@aperiodic.org> (cherry picked from commit 7ea9a85) Co-authored-by: Timothy Hopper <tdhopper@users.noreply.github.com>

Tim and Dan were authors for GH-11847

) Previously pdb checked the $HOME environmental variable to find the user .pdbrc. If $HOME is not set, the user .pdbrc would not be found. Change pdb to use `os.path.expanduser('~')` to determine the user's home directory. Thus, if $HOME is not set (as in tox or on Windows), os.path.expanduser('~') falls back on other techniques for locating the user's home directory. This follows pip's implementation for loading .piprc. Co-authored-by: Dan Lidral-Porter <dlp@aperiodic.org>

Tim and Dan were authors for pythonGH-11847

) Previously pdb checked the $HOME environmental variable to find the user .pdbrc. If $HOME is not set, the user .pdbrc would not be found. Change pdb to use `os.path.expanduser('~')` to determine the user's home directory. Thus, if $HOME is not set (as in tox or on Windows), os.path.expanduser('~') falls back on other techniques for locating the user's home directory. This follows pip's implementation for loading .piprc. Co-authored-by: Dan Lidral-Porter <dlp@aperiodic.org>

Tim and Dan were authors for pythonGH-11847

) Previously pdb checked the $HOME environmental variable to find the user .pdbrc. If $HOME is not set, the user .pdbrc would not be found. Change pdb to use `os.path.expanduser('~')` to determine the user's home directory. Thus, if $HOME is not set (as in tox or on Windows), os.path.expanduser('~') falls back on other techniques for locating the user's home directory. This follows pip's implementation for loading .piprc. Co-authored-by: Dan Lidral-Porter <dlp@aperiodic.org>

Tim and Dan were authors for pythonGH-11847

the-knights-who-say-ni added the CLA not signed label Feb 13, 2019

bedevere-bot added the awaiting review label Feb 13, 2019

tirkarthi mentioned this pull request Feb 14, 2019

bpo-20523: pdb.Pdb can read the global ~/.pdbrc file on Windows 7 #11855

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matrixise previously requested changes Feb 15, 2019

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tdhopper force-pushed the fix-issue-20523 branch from 93cddbf to 75c7c58 Compare February 15, 2019 15:52

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bpo-20523: pdb searches for .pdbrc in ~ instead of $HOME #11847

bpo-20523: pdb searches for .pdbrc in ~ instead of $HOME #11847

tdhopper commented Feb 13, 2019 •

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bpo-20523: pdb searches for .pdbrc in ~ instead of $HOME #11847

bpo-20523: pdb searches for .pdbrc in ~ instead of $HOME #11847

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