Error installing Python packages fails with trace
Metadata
Current evaluation
Python package failures show pip's error plus a long internal traceback; linked PR #2004 was incomplete because _pip bypassed the plugin execution API, with no later resolution reported.
Suggested action: keep open
Reason: The report gives three reproducible failures sharing Pip.download, and the reporter explicitly confirmed that PR #2004 did not fix the problem because _pip called snapcraft.internal.common.run directly. Although that legacy implementation has since moved, the replacement behavior has not been documented as fixed and should be regression-tested before closure.
Evaluated by: mr-cal-bot
Impact:
35
Quick Win:
19
Complexity:
38
Confidence:
84
Actionability:
86
Issue body
When using the Python plugin and there's a problem installing a Python package, Snapcraft aborts with both a verbatim error message from pip as well as a long trace.
There's 3 ways to get this to happen which go through the same code path which is why I'm filing one bug for it:
- A package from index (PyPI) can't be installed.
- The URL to a VCS branch can't be cloned.
- An error occurs downloading via http(s) eg. HTTP 404.
parts:
foo:
plugin: python
python-packages:
- <email address hidden>:kalikiana/does-not-exist.git#egg=ham
- http://someserver.org/packages/MyPackage-3.0.tar.gz
See below for abbreviated traces going through "Pip.download":
Collecting pip
Could not find a version that satisfies the requirement pip (from versions: )
No matching distribution found for pip
Traceback (most recent call last):
[...]
File "/home/rumo/dev/snapcraft/snapcraft/plugins/_python/_pip.py", line 196, in _ensure_pip_installed
self.download({'pip'})
[...]
File "/usr/lib/python3.5/subprocess.py", line 581, in check_call
raise CalledProcessError(retcode, cmd)
Invalid requirement: '<email address hidden>:kalikiana/does-not-exist.git'
It looks like a path. Does it exist ?
Traceback (most recent call last):
[...]
File "/home/rumo/dev/snapcraft/snapcraft/plugins/_python/_pip.py", line 275, in download
self._python_package_dir] + args, cwd=cwd)
[...]
File "/usr/lib/python3.5/subprocess.py", line 581, in check_call
raise CalledProcessError(retcode, cmd)
Collecting http://someserver.org/packages/MyPackage-3.0.tar.gz
HTTP error 404 while getting http://someserver.org/packages/MyPackage-3.0.tar.gz
Could not install requirement http://someserver.org/packages/MyPackage-3.0.tar.gz because of error 404 Client Error: Not Found for url: http://someserver.org/packages/MyPackage-3.0.tar.gz
Could not install requirement http://someserver.org/packages/MyPackage-3.0.tar.gz because of HTTP error 404 Client Error: Not Found for url: http://someserver.org/packages/MyPackage-3.0.tar.gz for URL http://someserver.org/packages/MyPackage-3.0.tar.gz
Traceback (most recent call last):
[...]
File "/home/rumo/dev/snapcraft/snapcraft/plugins/_python/_pip.py", line 275, in download
self._python_package_dir] + args, cwd=cwd)
[...]
File "/usr/lib/python3.5/subprocess.py", line 581, in check_call
raise CalledProcessError(retcode, cmd)
Evaluation history
| Date | Model | Scores | Action | Summary |
|---|---|---|---|---|
| stealth/space-bunny-alpha |
Impact:
35
Quick Win:
19
Complexity:
38
Confidence:
84
Actionability:
86
|
keep open | Python package failures show pip's error plus a long internal traceback; linked PR #2004 was incomplete because _pip bypassed the plugin execution API, with no later resolution reported. | |
| stealth/space-bunny-alpha |
Impact:
30
Quick Win:
21
Complexity:
20
Confidence:
93
Actionability:
88
|
close stale | Legacy Python package-install failures in Snapcraft's removed _pip.py path emitted duplicate errors and tracebacks; that code path has been replaced by craft-parts shell commands. | |
| qwen/qwen3.6-35b-a3b |
Impact:
20
Quick Win:
14
Complexity:
10
Confidence:
85
Actionability:
80
|
close resolved | Python plugin pip errors produce verbose tracebacks. The old _pip.py code path no longer exists; plugin now delegates to craft-parts library. | |
| qwen/qwen3.8-27b |
Impact:
25
Quick Win:
16
Staleness:
92
Complexity:
35
Confidence:
68
Support Request:
10
|
close stale | Python plugin pip install failures (PyPI miss, VCS clone fail, HTTP 404) abort snapcraft with raw pip output plus a long traceback instead of a clean error. 8.5 years old, zero comments, references removed code path snapcraft/plugins/_python/_pip.py. | |
| qwen/qwen3.6-35b-a3b |
Staleness:
95
Complexity:
25
Confidence:
85
Support Request:
5
|
close stale | Snapcraft Python plugin crashes with full tracebacks when pip fails to install packages. Untriaged, zero comments, over 8 years old. | |
| qwen/qwen3.6-35b-a3b |
Staleness:
95
Complexity:
40
Confidence:
90
Support Request:
10
|
close stale | Snapcraft's Python plugin prints full Python tracebacks instead of clean error messages when pip fails to install packages. The issue is over 8 years old with no maintainer response or comments. | |
| qwen3.6-35b-a3b-mtp-q6 |
Staleness:
98
Complexity:
20
Confidence:
90
Support Request:
5
|
close stale | Snapcraft's Python plugin exposes full Python tracebacks to users when pip fails to install packages. Issue is untriaged, has no comments, and is over 8 years old. |
Update history
| Date | Change |
|---|---|
| created |
Related work
-
Related To:
snapcore/snapcraft#2004
(confidence 100%)
A maintainer linked this attempted fix, but the reporter said it missed the internal _pip execution path.
Related issues
No related issues found above the similarity threshold.