From 98a9ee37addb7de16ae7b4d69109084abdbc0c76 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Steven=20Dee=20=28J=C5=8Dshin=29?= <mrdomino@stairwell.com>
Date: Thu, 17 Apr 2025 14:38:39 -0700
Subject: [PATCH] use git-restore-mtime-action

---
 .github/workflows/build.yml | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 1618d7998..29b0221f5 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -23,6 +23,12 @@ jobs:
         mode: ["", tiny, rel, tinylinux, optlinux]
     steps:
       - uses: actions/checkout@v4
+        with:
+          # Full checkout needed for git-restore-mtime-bare.
+          fetch-depth: 0
+
+      # TODO(jart): fork this action.
+      - uses: chetan/git-restore-mtime-action@v2
 
       - uses: actions/cache@v4
         with:
@@ -32,8 +38,9 @@ jobs:
       - uses: actions/cache@v4
         with:
           path: o
-          key: o-${{ matrix.mode }}-${{ env.COSMOCC_VERSION }}
+          key: o-${{ matrix.mode }}-${{ env.COSMOCC_VERSION }}-${{ github.sha }}
           restore-keys: |
+            o-${{ matrix.mode }}-${{ env.COSMOCC_VERSION }}-
             o-${{ matrix.mode }}-
             o-