Issue2576

Discovered and tested under macOS, then reduced to the following simple test case

(1) Install Jython 2.7.0, e.g. as follows:

$ java -jar jython-installer-2.7.0.jar -s -d ~/jython-2.7.0

(2) Update pip to current release, pip 9.0.1

$ ~/jython-2.7.0/bin/jython -m pip install --upgrade pip
Downloading/unpacking pip from https://pypi.python.org/packages/b6/ac/7015eb97dc749283ffdec1c3a88ddb8ae03b8fad0f0e611408f196358da3/pip-9.0.1-py2.py3-none-any.whl#md5=297dbd16ef53bcef0447d245815f5144
  Downloading pip-9.0.1-py2.py3-none-any.whl (1.3MB): 1.3MB downloaded
Installing collected packages: pip
  Found existing installation: pip 1.6.dev1
    Uninstalling pip:
      Successfully uninstalled pip
Successfully installed pip
Cleaning up...

(3) Attempt to run pip with a requirements file, even a trivial example:

$ echo pip > requirements.txt
$ ~/jython-2.7.0/bin/jython -m pip install -r requirements.txt 
Exception:
Traceback (most recent call last):
  File "/Users/xxx/jython-2.7.0/Lib/site-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/Users/xxx/jython-2.7.0/Lib/site-packages/pip/commands/install.py", line 310, in run
    self.populate_requirement_set(
  File "/Users/xxx/jython-2.7.0/Lib/site-packages/pip/basecommand.py", line 292, in populate_requirement_set
    for req in parse_requirements(
  File "/Users/xx/jython-2.7.0/Lib/site-packages/pip/req/req_file.py", line 89, in parse_requirements
    for line_number, line in lines_enum:
  File "/Users/xxx/jython-2.7.0/Lib/site-packages/pip/req/req_file.py", line 323, in ignore_comments
    for line_number, line in lines_enum:
  File "/Users/xxx/jython-2.7.0/Lib/site-packages/pip/req/req_file.py", line 298, in join_lines
    if COMMENT_RE.match(line):
RuntimeError: maximum recursion depth exceeded (Java StackOverflowError)


I'm assuming this is a Jython problem given pip 9.0.1 works fine for me under CPython and PyPy.

Peter, could you please test this with current trunk version or at least with 2.7.1 soft release candidate?
(See https://sourceforge.net/p/jython/mailman/message/35692550)

There have been some improvements regarding PIP since Jython 2.7.0.

I have just tested this with the current master and it appears to have already been fixed. I get:

james@james-ubuntu:~/jython2.7.1rc1/bin$ ./jython -m pip install --upgrade pip
Requirement already up-to-date: pip in /home/james/jython2.7.1rc1/Lib/site-packages

james@james-ubuntu:~/jython2.7.1rc1/bin$ ./pip --version
pip 9.0.1 from /home/james/jython2.7.1rc1/Lib/site-packages (python 2.7)

james@james-ubuntu:~/jython2.7.1rc1/bin$ echo pip > requirements.txt 

james@james-ubuntu:~/jython2.7.1rc1/bin$ ./jython -m pip install -r requirements.txt 
Requirement already satisfied: pip in /home/james/jython2.7.1rc1/Lib/site-packages (from -r requirements.txt (line 1))