#development
Title
m
melodic-thailand-99227
10/31/2021, 5:35 PMI’m not changing any 3rd party dependencies but pants decides to resolve constraints every few runs. I’m using pants 2.7.1.
Update: apparently it happens when I switch from running pants within a virtualenv and outside, is it supposed to happen?
h
happy-kitchen-89482
10/31/2021, 6:03 PMWhen you say "running pants within a virtualenv" you mean not via the
./pantsm
melodic-thailand-99227
10/31/2021, 6:20 PMI mean running the
./pantsh
happy-kitchen-89482
10/31/2021, 7:45 PMOh hm, that's not really a use case we've thought about. What is the reason for doing that? I can see how that might invalidate a resolve, since the interpreter selection process might see this as a new interpreter. @enough-analyst-54434 thoughts?
e
enough-analyst-54434
10/31/2021, 7:48 PMIIUC running inside a venv changes PATH. If that's part of the configured interpreter search path, and it is by default, mutating it should invalidate a bunch of work.
That said, it should be a zig-zag mutation and you should be able to flip in and out of the venv between two sets of cached results.
To be precise, by "running inside", I mean activating (or deactivating) a venv.
m
melodic-thailand-99227
10/31/2021, 8:29 PMOK, now I understand
a
ambitious-actor-36781
11/01/2021, 3:35 AMI've also noticied weirdness w/ constraints.
e.g. just now:
Copy code
╰─➤ ./pants package :: 127 ↵
16:35:09.17 [INFO] Initializing scheduler...
16:35:09.34 [INFO] Scheduler initialized.
⠐ 8.67s Resolving 3rdparty/constraints.txt
⠐ 9.13s Resolving 3rdparty/constraints.txth
happy-kitchen-89482
11/01/2021, 3:44 AMHmm, I think that might be a UI artifact? @witty-crayon-22786 thoughts?
w
witty-crayon-22786
11/01/2021, 4:45 PMthat’s likely because you have binaries with different 1) platforms, 2) interpreter constraints
➕ 1
a good thing to check is what the tool in https://blog.pantsbuild.org/python-3-migrations/ reports: it can summarize the intepreters used within your repository. fewer distinct sets is better in general
m
melodic-thailand-99227
11/01/2021, 5:39 PM Copy code
$ ./pants py-constraints --summary
Unknown flag --summary on global scope
Use `./pants help` to get help.
19:38:29.52 [ERROR] Unknown flags --summary on global scope
(Use --print-stacktrace for more error details and/or --no-process-execution-local-cleanup to inspect chroots and/or -ldebug for more logs. See <https://www.pantsbuild.org/v2.7/docs/troubleshooting> for common issues. Consider reaching out for help: <https://www.pantsbuild.org/v2.7/docs/getting-help.>)w
witty-crayon-22786
11/01/2021, 5:40 PM@melodic-thailand-99227: hm. do you have that backend enabled? it isn’t by default, sorry
need to add
--backend-packages=pants.backend.python.mixed_interpreter_constraintspants.tomlm
melodic-thailand-99227
11/01/2021, 5:46 PM@witty-crayon-22786 what should I look for?
w
witty-crayon-22786
11/01/2021, 5:48 PMsorry: my comment was somewhat specific to @ambitious-actor-36781’s output showing multiple resolves happening: you may not have more than one resolve happening in your repository.
but if you were to run
./pants --backend-packages=pants.backend.python.mixed_interpreter_constraints py-constraints ::a
ambitious-actor-36781
11/03/2021, 4:06 AMJust noticed this happen.
pants 2.8
list of commands that I ran:
•
pants build //src/python/service_a:docker-imagepants build //src/python/service_b:docker-imagepants build //src/python/service_c:docker-imagew
witty-crayon-22786
11/03/2021, 4:28 PMdoes
py-constraintsh
happy-kitchen-89482
11/03/2021, 6:09 PMRun
./pants py-constraints //src/python/service_a:docker-image