tree bfe2334b42758acb80a774405db1ec70ab28d9b2
parent dfbdd1fdb1aa8e33edb6b27c5ba49acb22170af6
author Michael Spang <spang@google.com> 1623292720 -0400
committer CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com> 1623440101 +0000

pw_build: Add support for --constraint options to pip

Using this with exact versions of all dependencies should result in a
deterministic python setup.

Unlike --requirement, this option does not install any packages. This
means we can ensure the desired versions will be installed without
installing everything immediately, and also means that dependencies of
conditionally installed packages do not get unconditionally installed.

Change-Id: I649ced04f46b92ed2d63a0fb664c8b9f0742db07
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/48522
Reviewed-by: Keir Mierle <keir@google.com>
Reviewed-by: Wyatt Hepler <hepler@google.com>
Commit-Queue: Michael Spang <spang@google.com>