pip hangs after something down, such as Successfully installed ...

[eromoe]

• Pip version:9.0.1
• Python version: 2.7.13 32bit
• Operating system:WIN7 X64

Description:

It suddenly happened today, I find pip hangs after some work down, such as Successfully installed ....
I have to Ctrl + C to break.

For example:

E:\Workspace\HearthSim\fireplace\tests>pip install pytest
Collecting pytest
  Downloading http://mirrors.aliyun.com/pypi/packages/73/e8/6d02c991f66d25f5a5eb66168295401876377d29
37771704d0cd949354de/pytest-3.1.2-py2.py3-none-any.whl (180kB)
    100% |████████████████████████████████| 184kB 1.4MB/s
Requirement already satisfied: setuptools in d:\python27\lib\site-packages (from pytest)
Requirement already satisfied: colorama; sys_platform == "win32" in d:\python27\lib\site-packages (f
rom pytest)
Collecting py>=1.4.33 (from pytest)
  Downloading http://mirrors.aliyun.com/pypi/packages/53/67/9620edf7803ab867b175e4fd23c7b8bd8eba11cb
761514dcd2e726ef07da/py-1.4.34-py2.py3-none-any.whl (84kB)
    100% |████████████████████████████████| 92kB 4.6MB/s
Installing collected packages: py, pytest
Successfully installed py-1.4.34 pytest-3.1.2
Traceback (most recent call last):
  File "d:\python27\lib\runpy.py", line 174, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "d:\python27\lib\runpy.py", line 72, in _run_code
    exec code in run_globals
  File "D:\Python27\Scripts\pip.exe\__main__.py", line 9, in <module>
  File "d:\python27\lib\site-packages\pip\__init__.py", line 233, in main
    return command.main(cmd_args)
  File "d:\python27\lib\site-packages\pip\basecommand.py", line 252, in main
    pip_version_check(session)
  File "d:\python27\lib\site-packages\pip\utils\outdated.py", line 138, in pip_version_check
    state.save(pypi_version, current_time)
  File "d:\python27\lib\site-packages\pip\utils\outdated.py", line 71, in save
    with lockfile.LockFile(self.statefile_path):
  File "d:\python27\lib\site-packages\pip\_vendor\lockfile\__init__.py", line 197, in __enter__
    self.acquire()
  File "d:\python27\lib\site-packages\pip\_vendor\lockfile\mkdirlockfile.py", line 57, in acquire
    time.sleep(wait)
KeyboardInterrupt

E:\Workspace\HearthSim\fireplace\tests>pip install -U pip
Requirement already up-to-date: pip in d:\python27\lib\site-packages
Traceback (most recent call last):
  File "d:\python27\lib\runpy.py", line 174, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "d:\python27\lib\runpy.py", line 72, in _run_code
    exec code in run_globals
  File "D:\Python27\Scripts\pip.exe\__main__.py", line 9, in <module>
  File "d:\python27\lib\site-packages\pip\__init__.py", line 233, in main
    return command.main(cmd_args)
  File "d:\python27\lib\site-packages\pip\basecommand.py", line 252, in main
    pip_version_check(session)
  File "d:\python27\lib\site-packages\pip\utils\outdated.py", line 138, in pip_version_check
    state.save(pypi_version, current_time)
  File "d:\python27\lib\site-packages\pip\utils\outdated.py", line 71, in save
    with lockfile.LockFile(self.statefile_path):
  File "d:\python27\lib\site-packages\pip\_vendor\lockfile\__init__.py", line 197, in __enter__
    self.acquire()
  File "d:\python27\lib\site-packages\pip\_vendor\lockfile\mkdirlockfile.py", line 57, in acquire
    time.sleep(wait)
KeyboardInterrupt

[pradyunsg]

Thanks for filing this issue!

I'll look into it; it seems to be related to the vendored lockfile project.

[pradyunsg]

This is a duplicate of #3532. Closing in favour of that.