From 4eac547a08b7b103c83828be1cdbea37779d6896 Mon Sep 17 00:00:00 2001
From: "Luis Gustavo S. Barreto" <gustavo@ossystems.com.br>
Date: Mon, 12 May 2025 10:23:30 -0300
Subject: [PATCH] ci: use local Go toolchain and downgrade Go version

The GitHub Actions workflow defines:

```yaml
strategy:
  matrix:
    go: ['1.23', '1.24']
```

However, the `1.23` job still ends up running Go `1.24`. By default,
`actions/setup-go` leaves `GOTOOLCHAIN=auto`, causing go itself to fetch the
version specified in `go.mod` instead instead of sticking to exactly `1.23`.

This led to a false positive in CI: it appeared as if the matrix was testing
Go `1.23`, when in reality all jobs were using Go `1.24`.

To fix this, we need to force the use of the local Go toolchain in the CI test
workflow to ensure the use of the locally installed Go version and avoid
automatic downloads by `setup-go`.

Also downgrades the Go version in `go.mod` from `1.24` to `1.23` to ensure
compatibility with environments that do not yet support Go `1.24`.

Fixes #126
---
 .github/workflows/golangci-lint.yml | 9 +++++++--
 .github/workflows/test.yml          | 2 ++
 go.mod                              | 2 +-
 3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/golangci-lint.yml b/.github/workflows/golangci-lint.yml
index b4a755a..2b05629 100644
--- a/.github/workflows/golangci-lint.yml
+++ b/.github/workflows/golangci-lint.yml
@@ -20,14 +20,19 @@ jobs:
   golangci:
     name: lint
     runs-on: ubuntu-latest
+    env:
+      GOTOOLCHAIN: local
     strategy:
       matrix:
-        go: ['1.24']
+        go: ['1.23', '1.24']
     steps:
+      - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go }}
-      - uses: actions/checkout@v4
+
+      - name: Tidy
+        run: go mod tidy
 
       - name: Format
         run: go fmt
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 30f0ae1..86f54a2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -7,6 +7,8 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
+    env:
+      GOTOOLCHAIN: local
     strategy:
       fail-fast: false
       matrix:
diff --git a/go.mod b/go.mod
index a844df8..c5d2a66 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/pires/go-proxyproto
 
-go 1.24
+go 1.23
 
 require golang.org/x/net v0.39.0