bug#23780: guix import pypi jedi: weird backtrace, no proper error message

[Ben Woodcroft <b.woodcroft@uq.edu.au>]

On 17/06/16 14:16, Danny Milosavljevic wrote:
> $ guix import pypi jedi
>
> Starting download of /tmp/guix-file.n01KoB
>  From https://pypi.python.org/packages/3a/37/629080b92b87bc65e3b1b4f5d539e22aa5dc45637eab0dd4b0cd8cf236c2/jedi-0.9.0.tar.gz...
>   ….0.tar.gz  326KiB                 402KiB/s 00:01 [####################] 100.0%
>
> Starting download of /tmp/guix-file.CbhRLk
>  From https://pypi.python.org/packages/c4/59/e48a369168a84c8aef9127c227fc3b9f53bc9c528b24c2cda20487bc2deb/jedi-0.9.0-py2.py3-none-any.whl...
>   …py3-none-any.whl  154KiB          291KiB/s 00:01 [####################] 100.0%
> Backtrace:
> In ice-9/boot-9.scm:
>   157: 19 [catch srfi-34 #<procedure 57736c0 at ice-9/eval.scm:416:20 ()> ...]
> In ice-9/r4rs.scm:
>    90: 18 [dynamic-wind #<procedure 5773570 at ice-9/eval.scm:416:20 ()> ...]
> In ice-9/eval.scm:
>   387: 17 [eval # #]
>   387: 16 [eval # #]
>   387: 15 [eval # #]
>   387: 14 [eval # #]
>   387: 13 [eval # #]
>   387: 12 [eval # #]
>   387: 11 [eval # #]
>   387: 10 [eval # #]
>   387: 9 [eval # #]
>   387: 8 [eval # #]
>   387: 7 [eval # #]
>   411: 6 [eval # #]
> In ice-9/r4rs.scm:
>    90: 5 [dynamic-wind #<procedure 57d3900 at ice-9/eval.scm:416:20 ()> ...]
>    90: 4 [dynamic-wind #<procedure 5c332a0 at ice-9/boot-9.scm:1133:2 _> ...]
> In ice-9/boot-9.scm:
>   867: 3 [call-with-input-file "jedi-0.9.0.dist-info/metadata.json" ...]
> In ice-9/eval.scm:
>   411: 2 [eval # #]
>   387: 1 [eval # #]
> In unknown file:
>     ?: 0 [list-ref #f 0]
>
> This stacktrace is ... unhelpful. I think there was a post somewhere where it detailed how to debug that but I can't find it again :(
>
> $ cat metadata.json
> {"classifiers": ["Development Status :: 4 - Beta", "Environment :: Plugins", "Intended Audience :: Developers", "License :: OSI Approved :: MIT License", "Operating System :: OS Independent", "Programming Language :: Python :: 2", "Programming Language :: Python :: 2.6", "Programming Language :: Python :: 2.7", "Programming Language :: Python :: 3", "Programming Language :: Python :: 3.2", "Programming Language :: Python :: 3.3", "Programming Language :: Python :: 3.4", "Topic :: Software Development :: Libraries :: Python Modules", "Topic :: Text Editors :: Integrated Development Environments (IDE)", "Topic :: Utilities"], "summary": "An autocompletion tool for Python that can be used for text editors.", "platform": "any", "generator": "bdist_wheel (0.24.0)", "metadata_version": "2.0", "version": "0.9.0", "extensions": {"python.details": {"contacts": [{"role": "author", "email": "davidhalter88@gmail.com", "name": "David Halter"}], "project_urls": {"Home": "https://github.com/davidhalter/jedi"}, "document_names": {"description": "DESCRIPTION.rst"}}}, "license": "MIT", "keywords": ["python", "completion", "refactoring", "vim"], "name": "jedi"}

I can confirm this. Running from the git repo gives a better stack trace 
(below). I think this might be due to the lack of "run_requires" in the 
json file. Do you think the solution might be to not require one? If so 
do you want to have a go at fixing this?

Thanks.

$ ./pre-inst-env guix import pypi jedi

Starting download of /tmp/guix-file.ohIhq3
From 
https://pypi.python.org/packages/3a/37/629080b92b87bc65e3b1b4f5d539e22aa5dc45637eab0dd4b0cd8cf236c2/jedi-0.9.0.tar.gz...
  ….0.tar.gz  326KiB                 175KiB/s 00:02 
[####################] 100.0%

Starting download of /tmp/guix-file.nXlt3z
From 
https://pypi.python.org/packages/c4/59/e48a369168a84c8aef9127c227fc3b9f53bc9c528b24c2cda20487bc2deb/jedi-0.9.0-py2.py3-none-any.whl...
  …py3-none-any.whl  154KiB          161KiB/s 00:01 
[####################] 100.0%
Backtrace:
In ice-9/boot-9.scm:
   63: 19 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
  432: 18 [eval # #]
In ice-9/boot-9.scm:
2401: 17 [save-module-excursion #<procedure 2586940 at 
ice-9/boot-9.scm:4045:3 ()>]
4050: 16 [#<procedure 2586940 at ice-9/boot-9.scm:4045:3 ()>]
1724: 15 [%start-stack load-stack ...]
1729: 14 [#<procedure 259cea0 ()>]
In unknown file:
    ?: 13 [primitive-load "/home/ben/git/guix/scripts/guix"]
In guix/ui.scm:
1209: 12 [run-guix-command import "pypi" "jedi"]
In guix/scripts/import.scm:
  110: 11 [guix-import "pypi" "jedi"]
In guix/scripts/import/pypi.scm:
   84: 10 [guix-import-pypi "jedi"]
In ice-9/boot-9.scm:
  157: 9 [catch srfi-34 #<procedure 5c5e360 at 
guix/import/pypi.scm:278:9 ()> ...]
In ice-9/r4rs.scm:
   90: 8 [dynamic-wind #<procedure 42120f0 at ice-9/eval.scm:416:20 ()> ...]
In guix/import/pypi.scm:
  267: 7 [#<procedure 40678a0 at guix/import/pypi.scm:247:3 (temp port)> 
"/tmp/guix-file.ohIhq3" ...]
  236: 6 [compute-inputs 
"https://pypi.python.org/packages/3a/37/629080b92b87bc65e3b1b4f5d539e22aa5dc45637eab0dd4b0cd8cf236c2/jedi-0.9.0.tar.gz" 
...]
  223: 5 [guess-requirements 
"https://pypi.python.org/packages/3a/37/629080b92b87bc65e3b1b4f5d539e22aa5dc45637eab0dd4b0cd8cf236c2/jedi-0.9.0.tar.gz" 
...]
In ice-9/r4rs.scm:
   90: 4 [dynamic-wind #<procedure 5ccb7e0 at ice-9/eval.scm:416:20 ()> ...]
In guix/import/pypi.scm:
  174: 3 [#<procedure 5ccab20 at guix/import/pypi.scm:191:5 (temp port)> 
"/tmp/guix-file.nXlt3z" ...]
In ice-9/boot-9.scm:
  867: 2 [call-with-input-file "jedi-0.9.0.dist-info/metadata.json" ...]
In guix/import/pypi.scm:
  178: 1 [#<procedure 4472d00 at guix/import/pypi.scm:175:17 (port)> 
#<input: jedi-0.9.0.dist-info/metadata.json 16>]
In unknown file:
    ?: 0 [list-ref #f 0]

ERROR: In procedure list-ref:
ERROR: In procedure list-ref: Wrong type argument in position 1: #f