command to check lock file

• I have searched the issues of this repo and believe that this is not a duplicate.

Issue

Would it be possible to add a poetry check command (oh, I see you’e used that already, maybe the command could be extended or have a poetry lock --check?) that will return zero if the current poetry.lock is both correct w.r.t. the pyproject.toml (ie: packages match) and that it matches the output of poetry lock.

[KonstantinSchubert]

The problem is that poetry update does two things, if my understanding is right:

1. Updates/installs/removes packages to match changes that were made to pyproject.toml

2. Updates packages even their specification did not change in pyproject.toml wasn’t because it finds a new version which is allowed by semver

In the first case, the peotry.lock does no longer match the pyproject.toml, it’s “illegal”. In the second case, the poetry.lock still matches the the pyproject.toml, it’s legal, just not using the latest semver-allowed version.

In CI, you usually want to force a poetry update in the first case, but not the second.

The proposed solutions in this thread do not differentiate between these two cases as far as I could tell. Therefore they aren’t really a solution and we still need a command.

[littlebtc]

I had figure out script to emulate the behavior of #1954 and fortunately it is simple:

python -c "from poetry.factory import Factory; l = Factory().create_poetry('.').locker; exit(0) if l.is_locked() and l.is_fresh() else exit(1)"  && echo 'OK'