From 483b42e8cc3eb63745b0d48d9822659dc4400ef2 Mon Sep 17 00:00:00 2001
From: danceratopz <danceratopz@gmail.com>
Date: Tue, 28 Apr 2026 13:56:00 +0200
Subject: [PATCH] fix(ci): redirect Go caches to a per-job temp dir

Self-hosted runners persist `$GOMODCACHE` (`/data/gh-home/go/pkg/mod`)
across jobs, so the `actions/setup-go` cache restore extracts a tarball
on top of files that already exist and emits hundreds of `tar: Cannot
open: File exists` lines before bailing out with `Failed to restore`.
The build still succeeds because the on-disk modules are reused, but
the log noise is alarming and the ~500 MB cache download is wasted.

Set `GOMODCACHE` and `GOCACHE` to `${{ runner.temp }}/go/...` before
each `setup-go` invocation so the cache always lands in an empty,
job-scoped directory. Behaviour on GitHub-hosted runners is unchanged;
self-hosted runners stop colliding without losing the GHA cache.
---
 .github/actions/build-benchmark-genesis/action.yaml | 9 +++++++++
 .github/actions/build-evm-client/geth/action.yaml   | 9 +++++++++
 .github/workflows/hive-consume.yaml                 | 8 ++++++++
 .github/workflows/hive-execute.yaml                 | 8 ++++++++
 4 files changed, 34 insertions(+)

diff --git a/.github/actions/build-benchmark-genesis/action.yaml b/.github/actions/build-benchmark-genesis/action.yaml
index 1838ed22c91..81d35d6c3c7 100644
--- a/.github/actions/build-benchmark-genesis/action.yaml
+++ b/.github/actions/build-benchmark-genesis/action.yaml
@@ -18,6 +18,15 @@ runs:
         ref: master
         path: hive
 
+    # Redirect Go's module/build caches to a per-job temp dir so the
+    # actions/setup-go cache restore extracts into an empty target. On
+    # self-hosted runners $GOMODCACHE persists across jobs and would
+    # otherwise collide with the cache tarball ("File exists" from tar).
+    - name: Use ephemeral Go cache dirs
+      shell: bash
+      run: |
+        echo "GOMODCACHE=${{ runner.temp }}/go/mod" >> "$GITHUB_ENV"
+        echo "GOCACHE=${{ runner.temp }}/go/build" >> "$GITHUB_ENV"
     - name: Setup Go for Hive
       uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 # v6.3.0
       with:
diff --git a/.github/actions/build-evm-client/geth/action.yaml b/.github/actions/build-evm-client/geth/action.yaml
index 8dd39d43254..7770f0192c1 100644
--- a/.github/actions/build-evm-client/geth/action.yaml
+++ b/.github/actions/build-evm-client/geth/action.yaml
@@ -42,6 +42,15 @@ runs:
         repository: ${{ inputs.repo }}
         ref: ${{ steps.geth-sha.outputs.sha }}
         path: go-ethereum
+    # See note in build-benchmark-genesis/action.yaml: redirect Go caches
+    # to a per-job temp dir so setup-go's cache restore doesn't collide
+    # with a persistent $GOMODCACHE on self-hosted runners.
+    - name: Use ephemeral Go cache dirs
+      if: steps.cache-restore.outputs.cache-hit != 'true'
+      shell: bash
+      run: |
+        echo "GOMODCACHE=${{ runner.temp }}/go/mod" >> "$GITHUB_ENV"
+        echo "GOCACHE=${{ runner.temp }}/go/build" >> "$GITHUB_ENV"
     - name: Setup golang
       if: steps.cache-restore.outputs.cache-hit != 'true'
       uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 # v6.3.0
diff --git a/.github/workflows/hive-consume.yaml b/.github/workflows/hive-consume.yaml
index d57778086f4..7e38cfb0dba 100644
--- a/.github/workflows/hive-consume.yaml
+++ b/.github/workflows/hive-consume.yaml
@@ -128,6 +128,14 @@ jobs:
           ref: master
           path: hive
 
+      # Redirect Go's caches to a per-job temp dir so the setup-go cache
+      # restore doesn't collide with a persistent $GOMODCACHE on
+      # self-hosted runners (see build-benchmark-genesis/action.yaml).
+      - name: Use ephemeral Go cache dirs
+        shell: bash
+        run: |
+          echo "GOMODCACHE=${{ runner.temp }}/go/mod" >> "$GITHUB_ENV"
+          echo "GOCACHE=${{ runner.temp }}/go/build" >> "$GITHUB_ENV"
       - name: Setup go env and cache
         uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 # v6.3.0
         with:
diff --git a/.github/workflows/hive-execute.yaml b/.github/workflows/hive-execute.yaml
index b4508a5423e..c4230b6ceeb 100644
--- a/.github/workflows/hive-execute.yaml
+++ b/.github/workflows/hive-execute.yaml
@@ -52,6 +52,14 @@ jobs:
           ref: master
           path: hive
 
+      # Redirect Go's caches to a per-job temp dir so the setup-go cache
+      # restore doesn't collide with a persistent $GOMODCACHE on
+      # self-hosted runners (see build-benchmark-genesis/action.yaml).
+      - name: Use ephemeral Go cache dirs
+        shell: bash
+        run: |
+          echo "GOMODCACHE=${{ runner.temp }}/go/mod" >> "$GITHUB_ENV"
+          echo "GOCACHE=${{ runner.temp }}/go/build" >> "$GITHUB_ENV"
       - name: Setup Go
         uses: actions/setup-go@d35c59abb061a4a6fb18e82ac0862c26744d6ab5 # v5.5.0
         with: