New issue 170: Mercurial can break when executed with environment interpreter
https://bitbucket.org/hpk42/tox/issue/170/mercurial-can-break-when-executed-with
Martin Geisler:
I ran into a fun little problem today: I have a dependency of this form in my
`requirements.txt` file:
-e hg+https://bitbucket.org/mg/cram/#egg=cram
I'm also a Mercurial developer, so I have a Mercurial compiled for Python 2.7
in my `PATH`. Unlike the system Mercurial (on Debian), this `hg` script starts
with
#!/usr/bin/env python
This causes problems when installing the dependency in a non-Python 2.7
environment since `pip` executes `hg` and this in turn finds the currently
selected interpreter.
For reference, the error looks like this:
Obtaining cram from hg+https://bitbucket.org/mg/cram/#egg=cram (from -r
/home/mg/src/zpm/test-requirements.txt (line 8))
Cloning hg https://bitbucket.org/mg/cram/ to
/home/mg/src/zpm/.tox/py26/src/cram
Traceback (most recent call last):
File "/home/mg/opt/bin/hg", line 38, in <module>
mercurial.dispatch.run()
File "/home/mg/src/mercurial-crew/mercurial/dispatch.py", line 28, in run
sys.exit((dispatch(request(sys.argv[1:])) or 0) & 255)
File "/home/mg/src/mercurial-crew/mercurial/dispatch.py", line 41, in
dispatch
req.ui = uimod.ui()
File "/home/mg/src/mercurial-crew/mercurial/ui.py", line 49, in __init__
for f in scmutil.rcpath():
File "/home/mg/src/mercurial-crew/mercurial/demandimport.py", line 102,
in __getattribute__
self._load()
File "/home/mg/src/mercurial-crew/mercurial/demandimport.py", line 74, in
_load
mod = _hgextimport(_import, head, globals, locals, None, level)
File "/home/mg/src/mercurial-crew/mercurial/demandimport.py", line 43, in
_hgextimport
return importfunc(name, globals, *args)
File "/home/mg/src/mercurial-crew/mercurial/scmutil.py", line 954, in
<module>
if util.safehasattr(parsers, 'dirs'):
File "/home/mg/src/mercurial-crew/mercurial/util.py", line 81, in
safehasattr
return getattr(thing, attr, _notset) is not _notset
File "/home/mg/src/mercurial-crew/mercurial/demandimport.py", line 102,
in __getattribute__
self._load()
File "/home/mg/src/mercurial-crew/mercurial/demandimport.py", line 74, in
_load
mod = _hgextimport(_import, head, globals, locals, None, level)
File "/home/mg/src/mercurial-crew/mercurial/demandimport.py", line 43, in
_hgextimport
return importfunc(name, globals, *args)
ImportError: Python minor version mismatch: The Mercurial extension modules
were compiled with Python 2.7.6, but Mercurial is currently using Python with
sys.hexversion=33949936: Python 2.6.8 (unknown, Jan 29 2013, 10:05:44)
[GCC 4.7.2]
at: /home/mg/src/zpm/.tox/py26/bin/python
The error can probably also occur when installing using a `-e bzr+` line in a
`requirements.txt` file.
I'm not sure the error really lies with tox — maybe it's pip that should
sanitize the environment before executing the external programs it needs for
downloading dependencies. Any advice on a good way to solve this?
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