From a12788a9e0e9b0835bbc8d58b063da30dd15d247 Mon Sep 17 00:00:00 2001
From: Jean-Paul Calderone <exarkun@twistedmatrix.com>
Date: Mon, 7 Oct 2019 14:00:41 -0400
Subject: [PATCH] try to have some circleci caching
---
.circleci/config.yml | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/.circleci/config.yml b/.circleci/config.yml
index 1ed65af..529d8b3 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -75,11 +75,52 @@ jobs:
- "checkout"
+ - "run":
+ # CircleCI won't let us interpolate NIXPKGS_REV into a cache key.
+ # Only CircleCI's own environment variables or variables set via the
+ # web interface in a "context" can be interpolated into cache keys.
+ # However, we can interpolate the checksum of a file... Since we
+ # don't care about the exact revision, we just care that a new
+ # revision gives us a new string, we can write the revision to a
+ # file and then put the checksum of that file into the cache key.
+ # This way, we don't have to maintain the nixpkgs revision in two
+ # places and risk having them desynchronize.
+ name: "Prepare For Cache Key"
+ command: |
+ echo "${NIXPKGS_REV}" > nixpkgs.rev
+
+ - restore_cache:
+ # Get all of Nix's state relating to the particular revision of
+ # nixpkgs we're using. It will always be the same. CircleCI
+ # artifacts and nixpkgs store objects are probably mostly hosted in
+ # the same place (S3) so there's not a lot of difference for
+ # anything that's pre-built. For anything we end up building
+ # ourselves, though, this saves us all of the build time (less the
+ # download time).
+ #
+ # Read about caching dependencies: https://circleci.com/docs/2.0/caching/
+ name: "Restore Nix Store Paths"
+ keys:
+ # Construct cache keys that allow sharing as long as nixpkgs
+ # revision is unchanged.
+ #
+ # If nixpkgs changes then potentially a lot of cached packages for
+ # the base system will be invalidated so we may as well drop them
+ # and make a new cache with the new packages.
+ - zkapauthorizer-nix-store-v1-{{ checksum "nixpkgs.rev" }}
+ - zkapauthorizer-nix-store-v1-
+
- run:
name: "Run Test Suite"
command: |
nix-build --argstr hypothesisProfile ci --arg collectCoverage true --attr doc
+ - save_cache:
+ name: "Cache Nix Store Paths"
+ key: zkapauthorizer-nix-store-v1-{{ checksum "nixpkgs.rev" }}
+ paths:
+ - "/nix"
+
- run:
name: "Report Coverage"
command: |
--
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