[runner] Allow to compile runner on macOS (for development purposes only) (#3276)

Author: peterschmidt85

runner/.justfile

@@ -45,7 +45,7 @@ build-runner-binary:
     #!/usr/bin/env bash
     set -e
     echo "Building runner for linux/amd64"
-    cd {{source_directory()}}/cmd/runner && GOOS=linux GOARCH=amd64 go build -ldflags "-X 'main.Version=$version' -extldflags '-static'"
+    cd {{source_directory()}}/cmd/runner && CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags "-X 'main.Version=$version' -extldflags '-static'"
     echo "Runner build complete!"
 
 # Build shim
@@ -56,7 +56,12 @@ build-shim-binary:
     cd {{source_directory()}}/cmd/shim
     if [ -n "$shim_os" ] && [ -n "$shim_arch" ]; then
         echo "Building shim for $shim_os/$shim_arch"
-        GOOS=$shim_os GOARCH=$shim_arch go build -ldflags "-X 'main.Version=$version' -extldflags '-static'"
+        if [ "$shim_os" = "linux" ] && [ "$(uname -s)" != "Linux" ]; then
+            echo "WARNING: Cross-compiling to Linux, disabling CGO (DCGM unavailable)"
+            CGO_ENABLED=0 GOOS=$shim_os GOARCH=$shim_arch go build -ldflags "-X 'main.Version=$version' -extldflags '-static'"
+        else
+            CGO_ENABLED=1 GOOS=$shim_os GOARCH=$shim_arch go build -ldflags "-X 'main.Version=$version'"
+        fi
     else
         echo "Building shim for current platform"
         go build -ldflags "-X 'main.Version=$version' -extldflags '-static'"

runner/internal/shim/dcgm/wrapper_linux.go

@@ -1,4 +1,4 @@
-//go:build linux
+//go:build linux && cgo
 
 package dcgm
 

runner/internal/shim/dcgm/wrapper_linux_nocgo.go

@@ -0,0 +1,9 @@
+//go:build linux && !cgo
+
+package dcgm
+
+import "fmt"
+
+func NewDCGMWrapper(address string) (DCGMWrapperInterface, error) {
+	return nil, fmt.Errorf("DCGM unavailable: built with CGO disabled (cross-compilation)")
+}

runner/internal/shim/dcgm/wrapper_linux_test.go

@@ -1,4 +1,4 @@
-//go:build linux
+//go:build linux && cgo
 
 package dcgm