Hi Fabian,

I see you have a too old pip version. Sorry for not giving you a faster reply, but just do: $ pip install --upgrade pip

And you will get the latest version from PyPI (0.8.1 by now).

I tried to install the package you did, and it worked here. http://paste.pocoo.org/show/294334/

Just update it! Hugo.

On Tue, Oct 19, 2010 at 9:19 AM, Fabian Sturm f@rtfs.org wrote:

Hi,

I am using pip version 0.3.1 on Ubuntu Linux 9.10 to install django-piston in a virtualenv.

Since I need a specific version of django-piston I have the following entry in the requirements.txt file:

-e hg+http://bitbucket.org/jespern/django-piston@dc0ee00d3bfc#egg=django-piston

The first time the install works fine with pip but on the second time I get the following error:

Command hg fetch -q failed with error code 255 Exception information: Traceback (most recent call last):  File "/usr/lib/python2.6/dist-packages/pip.py", line 252, in main    self.run(options, args)  File "/usr/lib/python2.6/dist-packages/pip.py", line 408, in run    requirement_set.install_files(finder, force_root_egg_info=self.bundle)  File "/usr/lib/python2.6/dist-packages/pip.py", line 1741, in install_files    req_to_install.update_editable()  File "/usr/lib/python2.6/dist-packages/pip.py", line 1486, in update_editable    version_control(self.url).obtain(self.source_dir)  File "/usr/lib/python2.6/dist-packages/pip.py", line 2942, in obtain    call_subprocess(['hg', 'fetch', '-q'], cwd=dest)  File "/usr/lib/python2.6/dist-packages/pip.py", line 3543, in call_subprocess    % (command_desc, proc.returncode)) InstallationError: Command hg fetch -q failed with error code 255

If I run "hg fetch -q" manually in the django-piston repository I get:

abort: working dir not at branch tip (use "hg update" to check out branch tip)

mercurial is at version 1.3.1.

Any ideas what is wrong and how I get it to work?

Thanks a lot, Fabian

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