Poetry update in synth

[mark-w-325]

When you run npx projen, it runs poetry update. is there a way to prevent this behavior to freeze the versioning?

[mrgrain]

Hi, running the projen default task will check if your pyproject.toml has changed since the last the synth (*), and if that's the case it will run poetry update to ensure that the lockfile is up-to-date. If the file has not changed, projen will run the safe poetry check --lock && poetry install command. This feature cannot be disabled easily.

You can see the logic defined here:

projen/src/python/poetry.ts

Lines 243 to 253 in 8048cd3

	public installDependencies() {
	this.project.logger.info("Installing dependencies...");
	const runtime = new TaskRuntime(this.project.outdir);
	// If the pyproject.toml file has changed, update the lockfile prior to installation
	if (this.pyProject.file.changed) {
	runtime.runTask(this.installTask.name);
	} else {
	runtime.runTask(this.installCiTask.name);
	}
	}
	}

(*) Conceptually, the pyproject.toml file is loaded from disk at the beginning of synth, then it's new contents are synth'd and both old and new contents are compared. If there's a difference the file is marked as changed. Most importantly, this could mean that your file was changed by something external to projen. In this case projen will still treat the file as changed.

[mark-w-325]

Thanks for the quick response! I will take a look. Right now, I have all packages defined with version=* so that is going to make the install command update the package (I believe). I had some issues with defining the versions and did not need to get tied down with resolving that at the moment.