** Description changed:
[ Impact ]
The jc package in Noble (1.25.1-1) shows three syntax warnings when installing
the package via 'apt install' [0]. These warnings occur because Python 3.12,
which ships with Noble, strictly flags invalid backslash escape sequences in
standard string literals, which will become hard syntax errors in future
Python
releases. [1]
The fix resolves the issue by prepending an 'r' to the affected string
literals
in jc/utils.py and jc/parsers/dir.py, turning them into raw strings. This fix
has already been accepted upstream in version 1.25.2 [2].
[ Test Plan ]
The test can be performed in a standard Ubuntu Noble environment using a LXD
container.
** Set Up Testing Environment **
1. Create a Noble LXD container:
- $ lxc launch ubuntu:noble jc-test
- $ lxc shell jc-test
+ $ lxc launch ubuntu:noble jc-test
+ $ lxc shell jc-test
** Verify the Bug **
2. Install the current version of jc:
- $ sudo apt update && sudo apt install -y jc
+ $ sudo apt update && sudo apt install -y jc
3. Confirm the warnings:
- Setting up jc (1.25.1-1) ...
- /usr/lib/python3/dist-packages/jc/parsers/dir.py:1: SyntaxWarning: invalid
escape sequence '\>'
- """jc - JSON Convert `dir` command output parser
- /usr/lib/python3/dist-packages/jc/utils.py:213: SyntaxWarning: invalid
escape sequence '\]'
- """
- /usr/lib/python3/dist-packages/jc/utils.py:232: SyntaxWarning: invalid
escape sequence '\]'
- special = '''!"#$%&'()*+,-./:;<=>?@[\]^`{|}~ '''
+ Setting up jc (1.25.1-1) ...
+ /usr/lib/python3/dist-packages/jc/parsers/dir.py:1: SyntaxWarning: invalid
escape sequence '\>'
+ """jc - JSON Convert `dir` command output parser
+ /usr/lib/python3/dist-packages/jc/utils.py:213: SyntaxWarning: invalid
escape sequence '\]'
+ """
+ /usr/lib/python3/dist-packages/jc/utils.py:232: SyntaxWarning: invalid
escape sequence '\]'
+ special = '''!"#$%&'()*+,-./:;<=>?@[\]^`{|}~ '''
** Verify the Fix **
4. Clean up previous installation:
- $ sudo apt remove --purge -y jc
-
+ $ sudo apt remove --purge -y jc
+
5. Enable proposed and install patched jc:
- $ sudo apt update && sudo apt install -y jc
+ $ sudo apt update && sudo apt install -y jc
- 6. Confirm the fix:
- Verify the terminal output does not contain any SyntaxWarning messages
+ 6. Confirm the fix:
+ Verify the terminal output does not contain any SyntaxWarning messages
[ Where Problems Could Occur ]
If a typo was introduced while prepending the raw string indicators (e.g.,
modifying the string boundaries or unintentionally altering characters inside
the string literals), the parser for the dir command or the normalize_key
function could process data incorrectly.
This would show up as failures or malformed JSON output when users attempt to
parse the dir command, or as incorrect key naming when processing fields that
contain special characters like brackets or backslashes.
[ Other Info ]
Since the syntax warnings were introduced in Python 3.12, Jammy is not
affected
by this bug as it ships with Python 3.10.
Packages in Questing and later releases already have the fix.
[0] - https://github.com/kellyjonbrazil/jc/issues/647
[1] - https://docs.python.org/3/whatsnew/3.12.html#other-language-changes
[2] -
https://github.com/kellyjonbrazil/jc/commit/50638cc11ed0eeb48b3c522102ebc574499c4e97
-
- Original Description: Find the original description of the bug below:
-
- The following messages are generated the jc package is installed on
- Noble:
-
- /usr/lib/python3/dist-packages/jc/parsers/dir.py:1: SyntaxWarning: invalid
escape sequence '\>'
- """jc - JSON Convert `dir` command output parser
- /usr/lib/python3/dist-packages/jc/utils.py:213: SyntaxWarning: invalid escape
sequence '\]'
- """
- /usr/lib/python3/dist-packages/jc/utils.py:232: SyntaxWarning: invalid escape
sequence '\]'
- special = '''!"#$%&'()*+,-./:;<=>?@[\]^`{|}~ '''
-
- Other releases are unaffected.
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https://bugs.launchpad.net/bugs/2153146
Title:
jc Package Produces SyntaxWarning Messages on Installation
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