https://bitbucket.org/hpk42/tox/issues/283/detox-creates-virtualenvs-repeatedly-and

.gitignore

.tox

README.rst

detox creates environments unnecessarily

Version information :

$ detox --version
2.1.1 imported from /home/mg/.venv/local/lib/python2.7/site-packages/tox/__init__.pyc

$ tox --version
2.1.1 imported from /home/mg/.venv/local/lib/python2.7/site-packages/tox/__init__.pyc

$ pip list | grep tox
detox (0.10.0)
tox (2.1.1)

Steps to reproduce:

1. Create a tox.ini:

   [tox]
   envlist = py27,py34
   skipsdist = true
   
   [testenv]
   deps =
       mock
   commands =
       python -c pass

2. Run detox :

   $ detox
   py27 create: /home/mg/src/bugs/detox-bug/.tox/py27
   py34 create: /home/mg/src/bugs/detox-bug/.tox/py34
   py27 installdeps: mock
   py34 installdeps: mock
   py27 runtests: PYTHONHASHSEED='1700383350'
   py27 runtests: commands[0] | python -c pass
   py34 runtests: PYTHONHASHSEED='1700383350'
   py34 runtests: commands[0] | python -c pass
   ________________________ summary ________________________
     py27: commands succeeded
     py34: commands succeeded
     congratulations :)

3. Run detox again.

Expected behavior:

$ detox
py27 runtests: PYTHONHASHSEED='3485389327'
py27 runtests: commands[0] | python -c pass
py34 runtests: PYTHONHASHSEED='3485389327'
py34 runtests: commands[0] | python -c pass
________________________ summary ________________________
  py27: commands succeeded
  py34: commands succeeded
  congratulations :)

Actual behavior:

$ detox
py27 create: /home/mg/src/bugs/detox-bug/.tox/py27
py34 create: /home/mg/src/bugs/detox-bug/.tox/py34
py27 installdeps: mock
py34 installdeps: mock
py34 runtests: PYTHONHASHSEED='2836152123'
py27 runtests: commands[0] | python -c pass
py27 runtests: PYTHONHASHSEED='2836152123'
py34 runtests: commands[0] | python -c pass
________________________ summary ________________________
  py27: commands succeeded
  py34: commands succeeded
  congratulations :)

Interesting observations:

• run tox, then run detox again:

  $ tox
  py27 create: /home/mg/src/bugs/detox-bug/.tox/py27
  py27 installdeps: mock
  py27 installed: funcsigs==0.4,mock==1.3.0,pbr==1.8.1,six==1.10.0,wheel==0.24.0
  py27 runtests: PYTHONHASHSEED='2247925867'
  py34 create: /home/mg/src/bugs/detox-bug/.tox/py34
  py34 installdeps: mock
  py34 installed: mock==1.3.0,pbr==1.8.1,six==1.10.0,wheel==0.24.0
  py34 runtests: PYTHONHASHSEED='2247925867'
  ________________________ summary ________________________
    py27: commands succeeded
    py34: commands succeeded
    congratulations :)
  
  $ detox
  py27 runtests: PYTHONHASHSEED='3552145827'
  py34 runtests: PYTHONHASHSEED='3552145827'
  ________________________ summary ________________________
    py27: commands succeeded
    py34: commands succeeded
    congratulations :)
  
  $ detox
  py27 runtests: PYTHONHASHSEED='1363150801'
  py34 runtests: PYTHONHASHSEED='1363150801'
  ________________________ summary ________________________
    py27: commands succeeded
    py34: commands succeeded
    congratulations :)

  see? it's fixed!

• edit tox.ini and change the deps of one of the environments:

  [testenv:py27]
  deps =
      mock
      coverage

  Now run detox twice :

  $ detox
  py27 recreate: /home/mg/src/bugs/detox-bug/.tox/py27
  py34 runtests: PYTHONHASHSEED='2209373244'
  py27 installdeps: mock, coverage
  py27 runtests: PYTHONHASHSEED='2209373244'
  ________________________ summary ________________________
    py27: commands succeeded
    py34: commands succeeded
    congratulations :)
  
  $ detox
  py27 create: /home/mg/src/bugs/detox-bug/.tox/py27
  py34 runtests: PYTHONHASHSEED='1329105987'
  py27 installdeps: mock, coverage
  py27 runtests: PYTHONHASHSEED='1329105987'
  ________________________ summary ________________________
    py27: commands succeeded
    py34: commands succeeded
    congratulations :)

  Note how it recreates the env on 1st run, and then plain "creates" it again? Now run tox twice and detox again:

  $ tox
  py27 create: /home/mg/src/bugs/detox-bug/.tox/py27
  py27 installdeps: mock, coverage
  py27 installed: coverage==4.0.1,funcsigs==0.4,mock==1.3.0,pbr==1.8.1,six==1.10.0,wheel==0.24.0
  py27 runtests: PYTHONHASHSEED='1755727780'
  py34 installed: mock==1.3.0,pbr==1.8.1,six==1.10.0,wheel==0.24.0
  py34 runtests: PYTHONHASHSEED='1755727780'
  ________________________ summary ________________________
    py27: commands succeeded
    py34: commands succeeded
    congratulations :)
  
  $ tox
  py27 installed: coverage==4.0.1,funcsigs==0.4,mock==1.3.0,pbr==1.8.1,six==1.10.0,wheel==0.24.0
  py27 runtests: PYTHONHASHSEED='1931080271'
  py34 installed: mock==1.3.0,pbr==1.8.1,six==1.10.0,wheel==0.24.0
  py34 runtests: PYTHONHASHSEED='1931080271'
  ________________________ summary ________________________
    py27: commands succeeded
    py34: commands succeeded
    congratulations :)
  
  $ detox
  py27 runtests: PYTHONHASHSEED='3586531515'
  py34 runtests: PYTHONHASHSEED='3586531515'
  ________________________ summary ________________________
    py27: commands succeeded
    py34: commands succeeded
    congratulations :)

tox.ini

[tox]
envlist = py27,py34
skipsdist = true

[testenv]
deps =
  mock
commands =
  python -c 'pass'