Testenv virtual environments are always recreated even if dependencies have not changed

[johnthagen]

The envs are recreated each time, which causes subsequent runs to be just as slow as the initial run, rather than skipping installation as is typical with tox. This makes it difficult to use in a pre-commit situation, due to how long the delay is before tox commands complete.

% tox -e fmt
fmt create: /Users/user/PycharmProjects/python-test/.tox/fmt
[tox-poetry-installer]: (fmt) installing 10 env dependencies from lockfile
fmt installed: appdirs==1.4.4,black==20.8b1,click==7.1.2,isort==5.6.4,mypy-extensions==0.4.3,pathspec==0.8.0,regex==2020.10.23,toml==0.10.1,typed-ast==1.4.1,typing-extensions==3.7.4.3
fmt run-test-pre: PYTHONHASHSEED='943038290'
fmt run-test: commands[0] | isort .
Skipped 1 files
fmt run-test: commands[1] | black .
All done! ✨ 🍰 ✨
1 file left unchanged.
_________________________________________________________________________________________ summary _________________________________________________________________________________________
  fmt: commands succeeded
  congratulations :)
% tox -e fmt
fmt recreate: /Users/user/PycharmProjects/python-test/.tox/fmt
[tox-poetry-installer]: (fmt) installing 10 env dependencies from lockfile
fmt installed: appdirs==1.4.4,black==20.8b1,click==7.1.2,isort==5.6.4,mypy-extensions==0.4.3,pathspec==0.8.0,regex==2020.10.23,toml==0.10.1,typed-ast==1.4.1,typing-extensions==3.7.4.3
fmt run-test-pre: PYTHONHASHSEED='3751324691'
fmt run-test: commands[0] | isort .
Skipped 1 files
fmt run-test: commands[1] | black .
All done! ✨ 🍰 ✨
1 file left unchanged.
_________________________________________________________________________________________ summary _________________________________________________________________________________________
  fmt: commands succeeded
  congratulations :)

With require_locked_deps = true:

tox -e fmt  17.97s user 4.11s system 49% cpu 44.674 total

When set to false:

tox -e fmt  1.62s user 0.53s system 16% cpu 12.796 total

Config

[tox]
skipsdist = true
isolated_build = true
requires =
    tox-poetry-installer>=0.3.1

[testenv:fmt]
require_locked_deps = false
deps =
    isort
    black
commands =
    isort .
    black .

[tool.poetry]
name = "python-test"
version = "0.1.0"
description = ""
authors = []
license = "MIT"

[tool.poetry.dependencies]
python = "^3.8"

[tool.poetry.dev-dependencies]
black = "^20.8b1"
isort = "^5.6.4"
tox = "^3.20.1"

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"

poetry.lock

[[package]]
name = "appdirs"
version = "1.4.4"
description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
category = "dev"
optional = false
python-versions = "*"

[[package]]
name = "black"
version = "20.8b1"
description = "The uncompromising code formatter."
category = "dev"
optional = false
python-versions = ">=3.6"

[package.dependencies]
appdirs = "*"
click = ">=7.1.2"
mypy-extensions = ">=0.4.3"
pathspec = ">=0.6,<1"
regex = ">=2020.1.8"
toml = ">=0.10.1"
typed-ast = ">=1.4.0"
typing-extensions = ">=3.7.4"

[package.extras]
colorama = ["colorama (>=0.4.3)"]
d = ["aiohttp (>=3.3.2)", "aiohttp-cors"]

[[package]]
name = "click"
version = "7.1.2"
description = "Composable command line interface toolkit"
category = "dev"
optional = false
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"

[[package]]
name = "colorama"
version = "0.4.4"
description = "Cross-platform colored terminal text."
category = "dev"
optional = false
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"

[[package]]
name = "distlib"
version = "0.3.1"
description = "Distribution utilities"
category = "dev"
optional = false
python-versions = "*"

[[package]]
name = "filelock"
version = "3.0.12"
description = "A platform independent file lock."
category = "dev"
optional = false
python-versions = "*"

[[package]]
name = "isort"
version = "5.6.4"
description = "A Python utility / library to sort Python imports."
category = "dev"
optional = false
python-versions = ">=3.6,<4.0"

[package.extras]
pipfile_deprecated_finder = ["pipreqs", "requirementslib"]
requirements_deprecated_finder = ["pipreqs", "pip-api"]
colors = ["colorama (>=0.4.3,<0.5.0)"]

[[package]]
name = "mypy-extensions"
version = "0.4.3"
description = "Experimental type system extensions for programs checked with the mypy typechecker."
category = "dev"
optional = false
python-versions = "*"

[[package]]
name = "packaging"
version = "20.4"
description = "Core utilities for Python packages"
category = "dev"
optional = false
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"

[package.dependencies]
pyparsing = ">=2.0.2"
six = "*"

[[package]]
name = "pathspec"
version = "0.8.0"
description = "Utility library for gitignore style pattern matching of file paths."
category = "dev"
optional = false
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"

[[package]]
name = "pluggy"
version = "0.13.1"
description = "plugin and hook calling mechanisms for python"
category = "dev"
optional = false
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"

[package.extras]
dev = ["pre-commit", "tox"]

[[package]]
name = "py"
version = "1.9.0"
description = "library with cross-python path, ini-parsing, io, code, log facilities"
category = "dev"
optional = false
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"

[[package]]
name = "pyparsing"
version = "2.4.7"
description = "Python parsing module"
category = "dev"
optional = false
python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"

[[package]]
name = "regex"
version = "2020.10.23"
description = "Alternative regular expression module, to replace re."
category = "dev"
optional = false
python-versions = "*"

[[package]]
name = "six"
version = "1.15.0"
description = "Python 2 and 3 compatibility utilities"
category = "dev"
optional = false
python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"

[[package]]
name = "toml"
version = "0.10.1"
description = "Python Library for Tom's Obvious, Minimal Language"
category = "dev"
optional = false
python-versions = "*"

[[package]]
name = "tox"
version = "3.20.1"
description = "tox is a generic virtualenv management and test command line tool"
category = "dev"
optional = false
python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"

[package.dependencies]
colorama = {version = ">=0.4.1", markers = "platform_system == \"Windows\""}
filelock = ">=3.0.0"
packaging = ">=14"
pluggy = ">=0.12.0"
py = ">=1.4.17"
six = ">=1.14.0"
toml = ">=0.9.4"
virtualenv = ">=16.0.0,<20.0.0 || >20.0.0,<20.0.1 || >20.0.1,<20.0.2 || >20.0.2,<20.0.3 || >20.0.3,<20.0.4 || >20.0.4,<20.0.5 || >20.0.5,<20.0.6 || >20.0.6,<20.0.7 || >20.0.7"

[package.extras]
docs = ["pygments-github-lexers (>=0.0.5)", "sphinx (>=2.0.0)", "sphinxcontrib-autoprogram (>=0.1.5)", "towncrier (>=18.5.0)"]
testing = ["flaky (>=3.4.0)", "freezegun (>=0.3.11)", "pathlib2 (>=2.3.3)", "psutil (>=5.6.1)", "pytest (>=4.0.0)", "pytest-cov (>=2.5.1)", "pytest-mock (>=1.10.0)", "pytest-randomly (>=1.0.0)", "pytest-xdist (>=1.22.2)"]

[[package]]
name = "typed-ast"
version = "1.4.1"
description = "a fork of Python 2 and 3 ast modules with type comment support"
category = "dev"
optional = false
python-versions = "*"

[[package]]
name = "typing-extensions"
version = "3.7.4.3"
description = "Backported and Experimental Type Hints for Python 3.5+"
category = "dev"
optional = false
python-versions = "*"

[[package]]
name = "virtualenv"
version = "20.1.0"
description = "Virtual Python Environment builder"
category = "dev"
optional = false
python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"

[package.dependencies]
appdirs = ">=1.4.3,<2"
distlib = ">=0.3.1,<1"
filelock = ">=3.0.0,<4"
six = ">=1.9.0,<2"

[package.extras]
docs = ["proselint (>=0.10.2)", "sphinx (>=3)", "sphinx-argparse (>=0.2.5)", "sphinx-rtd-theme (>=0.4.3)", "towncrier (>=19.9.0rc1)"]
testing = ["coverage (>=4)", "coverage-enable-subprocess (>=1)", "flaky (>=3)", "pytest (>=4)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.1)", "pytest-mock (>=2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)", "pytest-xdist (>=1.31.0)", "packaging (>=20.0)", "xonsh (>=0.9.16)"]

[metadata]
lock-version = "1.1"
python-versions = "^3.8"
content-hash = "e71e289ece40ec13401b98c63c9e58b8a23dfa899e4e8fe436a035c6bb4a1a30"

[metadata.files]
appdirs = [
    {file = "appdirs-1.4.4-py2.py3-none-any.whl", hash = "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"},
    {file = "appdirs-1.4.4.tar.gz", hash = "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41"},
]
black = [
    {file = "black-20.8b1.tar.gz", hash = "sha256:1c02557aa099101b9d21496f8a914e9ed2222ef70336404eeeac8edba836fbea"},
]
click = [
    {file = "click-7.1.2-py2.py3-none-any.whl", hash = "sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc"},
    {file = "click-7.1.2.tar.gz", hash = "sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a"},
]
colorama = [
    {file = "colorama-0.4.4-py2.py3-none-any.whl", hash = "sha256:9f47eda37229f68eee03b24b9748937c7dc3868f906e8ba69fbcbdd3bc5dc3e2"},
    {file = "colorama-0.4.4.tar.gz", hash = "sha256:5941b2b48a20143d2267e95b1c2a7603ce057ee39fd88e7329b0c292aa16869b"},
]
distlib = [
    {file = "distlib-0.3.1-py2.py3-none-any.whl", hash = "sha256:8c09de2c67b3e7deef7184574fc060ab8a793e7adbb183d942c389c8b13c52fb"},
    {file = "distlib-0.3.1.zip", hash = "sha256:edf6116872c863e1aa9d5bb7cb5e05a022c519a4594dc703843343a9ddd9bff1"},
]
filelock = [
    {file = "filelock-3.0.12-py3-none-any.whl", hash = "sha256:929b7d63ec5b7d6b71b0fa5ac14e030b3f70b75747cef1b10da9b879fef15836"},
    {file = "filelock-3.0.12.tar.gz", hash = "sha256:18d82244ee114f543149c66a6e0c14e9c4f8a1044b5cdaadd0f82159d6a6ff59"},
]
isort = [
    {file = "isort-5.6.4-py3-none-any.whl", hash = "sha256:dcab1d98b469a12a1a624ead220584391648790275560e1a43e54c5dceae65e7"},
    {file = "isort-5.6.4.tar.gz", hash = "sha256:dcaeec1b5f0eca77faea2a35ab790b4f3680ff75590bfcb7145986905aab2f58"},
]
mypy-extensions = [
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    {file = "mypy_extensions-0.4.3.tar.gz", hash = "sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8"},
]
packaging = [
    {file = "packaging-20.4-py2.py3-none-any.whl", hash = "sha256:998416ba6962ae7fbd6596850b80e17859a5753ba17c32284f67bfff33784181"},
    {file = "packaging-20.4.tar.gz", hash = "sha256:4357f74f47b9c12db93624a82154e9b120fa8293699949152b22065d556079f8"},
]
pathspec = [
    {file = "pathspec-0.8.0-py2.py3-none-any.whl", hash = "sha256:7d91249d21749788d07a2d0f94147accd8f845507400749ea19c1ec9054a12b0"},
    {file = "pathspec-0.8.0.tar.gz", hash = "sha256:da45173eb3a6f2a5a487efba21f050af2b41948be6ab52b6a1e3ff22bb8b7061"},
]
pluggy = [
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    {file = "pluggy-0.13.1.tar.gz", hash = "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0"},
]
py = [
    {file = "py-1.9.0-py2.py3-none-any.whl", hash = "sha256:366389d1db726cd2fcfc79732e75410e5fe4d31db13692115529d34069a043c2"},
    {file = "py-1.9.0.tar.gz", hash = "sha256:9ca6883ce56b4e8da7e79ac18787889fa5206c79dcc67fb065376cd2fe03f342"},
]
pyparsing = [
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    {file = "pyparsing-2.4.7.tar.gz", hash = "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1"},
]
regex = [
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    {file = "regex-2020.10.23-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:4e21340c07090ddc8c16deebfd82eb9c9e1ec5e62f57bb86194a2595fd7b46e0"},
    {file = "regex-2020.10.23-cp36-cp36m-manylinux2010_i686.whl", hash = "sha256:e5f6aa56dda92472e9d6f7b1e6331f4e2d51a67caafff4d4c5121cadac03941e"},
    {file = "regex-2020.10.23-cp36-cp36m-manylinux2010_x86_64.whl", hash = "sha256:c30d8766a055c22e39dd7e1a4f98f6266169f2de05db737efe509c2fb9c8a3c8"},
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six = [
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]
toml = [
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    {file = "toml-0.10.1.tar.gz", hash = "sha256:926b612be1e5ce0634a2ca03470f95169cf16f939018233a670519cb4ac58b0f"},
]
tox = [
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    {file = "tox-3.20.1.tar.gz", hash = "sha256:4321052bfe28f9d85082341ca8e233e3ea901fdd14dab8a5d3fbd810269fbaf6"},
]
typed-ast = [
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    {file = "typed_ast-1.4.1-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:aaee9905aee35ba5905cfb3c62f3e83b3bec7b39413f0a7f19be4e547ea01ebb"},
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[enpaul]

For the moment this is actually an intentional design choice. I'm not yet sure what the best way to tell when the lockfile has changed is. Since the plugin can't accurately detect dependency changes in the lockfile the safest option is to always reinstall all dependencies for an environment just in case.

That said, this is a pretty serious efficiency hit. I'm still thinking about what the best way to tackle this is. Any suggestions/input would definitely be appreciated!

[johnthagen]

@enpaul Since tox already has the recreate flag, I'd personally leave it up to the end user to either set this if they always want to recreate, or manually specify it on the command line for a specific run: tox --recreate -e fmt.

This is a bigger issue for tox, as this is already a problem if you use requirements.txt files: tox-dev/tox#149

So this plugin would be no worse than the status quo if it leaves it to the user. I personally think allowing the user to make the choice would be best. You could add documentation about setting recreate = true globally as an option for users that want this?

# For users that want to always recreate to ensure test envs are in sync with poetry.lock at the cost
# of always having to wait for the envs to be recreated
[testenv]
# Inherited to all testenvs
recreate = true
require_locked_deps = true

[enpaul]

Did some research on this, and I think it's going to require the addition of a new hook implementation, specifically tox_configure. I believe that this is invoked before the venv dependency check is done here and so can be used to modify the config to make it look like it's the same as the previous one.

That said, I need to understand better how tox figures out whether a venv has changed before I go down this path. I believe this is the critical spot where this is done.

[johnthagen]

@enpaul Just wanted to say our team updated to 0.5.0 and everything is running great! You've solved all of the issues we were running into and everything runs smoothly.

Thanks!

[enpaul]

@johnthagen Awesome! Glad to hear it's working well for you guys, and thank you for all your suggestions and feedback on this project!