From 25ae1f7f7233deeefe793028552cb22f85b71d86 Mon Sep 17 00:00:00 2001
From: Timothy Flynn <trflynn89@pm.me>
Date: Thu, 19 Aug 2021 14:41:02 -0400
Subject: CI: Include a timestamp in the Azure ccache key

Caches on Azure are immutable - so if a cache changes, but its key does
not, then the cache is not updated. Include a timestamp in the ccache
key so that we always push an updated cache from the master branch. Then
use a subkey without the timestamp to pull the cache.

We use a similar trick on GitHub Actions.
---
 Meta/Azure/Caches.yml | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'Meta/Azure')

diff --git a/Meta/Azure/Caches.yml b/Meta/Azure/Caches.yml
index 5ecfe58d68..99a9b1aa27 100644
--- a/Meta/Azure/Caches.yml
+++ b/Meta/Azure/Caches.yml
@@ -6,6 +6,10 @@ parameters:
   ccache_version: 1 # Increment this number if CI has trouble with ccache.
 
 steps:
+  - script: |
+      echo "##vso[task.setvariable variable=timestamp]$(date -u +"%Y%m%d%H%M_%S")"
+    displayName: 'Stamps'
+
   - ${{ if ne(parameters.arch, 'Lagom') }}:
     - ${{ if eq(parameters.toolchain, 'clang') }}:
       - task: Cache@2
@@ -22,7 +26,9 @@ steps:
 
   - task: Cache@2
     inputs:
-      key: '"ccache" | "${{ parameters.os }}" | "${{ parameters.arch }}" | "${{ parameters.toolchain }}" | "${{ parameters.ccache_version }}"'
+      key: '"ccache" | "${{ parameters.os }}" | "${{ parameters.arch }}" | "${{ parameters.toolchain }}" | "${{ parameters.ccache_version }}" | "$(timestamp)"'
+      restoreKeys: |
+        "ccache" | "${{ parameters.os }}" | "${{ parameters.arch }}" | "${{ parameters.toolchain }}" | "${{ parameters.ccache_version }}"
       path: $(CCACHE_DIR)
     displayName: 'Compiler Cache'
 
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