From a8ffa890114f564daec7fd902cf15d3bed11f49d Mon Sep 17 00:00:00 2001
From: Eric Rakestraw <eric@rakestraw.us>
Date: Wed, 4 Nov 2026 00:47:38 +0000
Subject: [PATCH] Use the host target in the multi-module launcher

---
 cmd/releasekit/multi_module_example_test.go | 28 +++++++++++++++++++++
 docs/roadmap/implementation.md              |  2 ++
 examples/multi-module/release.sh            |  3 +++
 3 files changed, 33 insertions(+)

diff --git a/cmd/releasekit/multi_module_example_test.go b/cmd/releasekit/multi_module_example_test.go
index 69b79cc..d93639e 100644
--- a/cmd/releasekit/multi_module_example_test.go
+++ b/cmd/releasekit/multi_module_example_test.go
@@ -8,6 +8,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"runtime"
 	"strconv"
 	"strings"
 	"testing"
@@ -81,6 +82,11 @@ func TestMultiModuleLauncherUsesSelectedModuleAndProfile(t *testing.T) {
 	shim := `#!/bin/sh
 set -eu
 printf 'cwd=%s args=%s\n' "$PWD" "$*" >> "$RELEASEKIT_TEST_GO_LOG"
+if [ "$1" = env ]; then
+  case "$2" in GOHOSTOS) printf '%s\n' "$RELEASEKIT_TEST_HOST_OS" ;; GOHOSTARCH) printf '%s\n' "$RELEASEKIT_TEST_HOST_ARCH" ;; esac
+  exit 0
+fi
+case " $* " in *" -deps "*) printf 'target=%s/%s\n' "$GOOS" "$GOARCH" >> "$RELEASEKIT_TEST_GO_LOG" ;; esac
 modfile=
 for argument in "$@"; do
   case "$argument" in -modfile=*) modfile=${argument#-modfile=} ;; esac
@@ -98,6 +104,11 @@ fi
 	t.Setenv("RELEASEKIT_MODULE_MAP", mapPath)
 	t.Setenv("RELEASEKIT_TEST_GO_LOG", goLog)
 	t.Setenv("RELEASEKIT_TEST_TOOL_ARGS", argsLog)
+	t.Setenv("RELEASEKIT_TEST_HOST_OS", runtime.GOOS)
+	t.Setenv("RELEASEKIT_TEST_HOST_ARCH", runtime.GOARCH)
+	foreignOS, foreignArch := foreignTarget()
+	t.Setenv("GOOS", foreignOS)
+	t.Setenv("GOARCH", foreignArch)
 	launcher := filepath.Join(repository, "release.sh")
 	command := exec.Command(launcher, "with space", "v1.2.4")
 	var stdout, stderr bytes.Buffer
@@ -115,6 +126,9 @@ fi
 	if !strings.Contains(string(goCommands), "cwd="+wantModule) || !strings.Contains(string(goCommands), "v0.2.299") || strings.Contains(string(goCommands), "v0.2.197") {
 		t.Fatalf("tool bootstrap did not use selected module metadata: %s", goCommands)
 	}
+	if !strings.Contains(string(goCommands), "target="+runtime.GOOS+"/"+runtime.GOARCH) {
+		t.Fatalf("dependency inspection did not use host target: %s", goCommands)
+	}
 	toolArgs, err := os.ReadFile(argsLog)
 	if err != nil {
 		t.Fatal(err)
@@ -152,6 +166,9 @@ func TestMultiModuleLauncherRunsToolFromSelectedDependency(t *testing.T) {
 	t.Setenv("GOPROXY", "file://"+filepath.ToSlash(proxy))
 	t.Setenv("GOSUMDB", "off")
 	t.Setenv("GOTOOLCHAIN", "local")
+	foreignOS, foreignArch := foreignTarget()
+	t.Setenv("GOOS", foreignOS)
+	t.Setenv("GOARCH", foreignArch)
 	moduleBefore, err := os.ReadFile(filepath.Join(repository, "integrations", "ckconfig", "go.mod"))
 	if err != nil {
 		t.Fatal(err)
@@ -203,6 +220,17 @@ func TestMultiModuleLauncherRunsToolFromSelectedDependency(t *testing.T) {
 	}
 }
 
+func foreignTarget() (string, string) {
+	osName, arch := "windows", "arm64"
+	if runtime.GOOS == osName {
+		osName = "linux"
+	}
+	if runtime.GOARCH == arch {
+		arch = "amd64"
+	}
+	return osName, arch
+}
+
 func runModuleSelector(t *testing.T, helper, mode, value, mapPath string) string {
 	t.Helper()
 	command := exec.Command("sh", helper, mode, value)
diff --git a/docs/roadmap/implementation.md b/docs/roadmap/implementation.md
index 4d2675a..228b0b2 100644
--- a/docs/roadmap/implementation.md
+++ b/docs/roadmap/implementation.md
@@ -8,6 +8,8 @@ checks in Stage 6.
 
 ## Stage 1: Normalize the local multi-module launcher
 
+**Completed.**
+
 1. In [the multi-module launcher](../../examples/multi-module/release.sh), after
    entering the selected module and exporting its existing `GOWORK=off` and
    `GOTOOLCHAIN=local` settings, insert the following before the first Go
diff --git a/examples/multi-module/release.sh b/examples/multi-module/release.sh
index 895f99b..7d02ad3 100755
--- a/examples/multi-module/release.sh
+++ b/examples/multi-module/release.sh
@@ -36,6 +36,9 @@ releasekit_module=go.maximumdirect.net/releasekit
   cd "$module_path"
   export GOWORK=off
   export GOTOOLCHAIN=local
+  releasekit_host_os=$(go env GOHOSTOS) || exit $?
+  releasekit_host_arch=$(go env GOHOSTARCH) || exit $?
+  export GOOS="$releasekit_host_os" GOARCH="$releasekit_host_arch"
   go list -mod=mod -modfile="$bootstrap_dir/releasekit.mod" -m "$releasekit_module"
   go mod edit -modfile="$bootstrap_dir/releasekit.mod" -tool="$releasekit_module/cmd/releasekit"
   go list -mod=mod -modfile="$bootstrap_dir/releasekit.mod" -deps "$releasekit_module/cmd/releasekit" > /dev/null