cmd/buildkitd: move reexec.Init to non-Linux files

reexec is only used on Windows and BSD for;

- util/system/getuserinfo (lookup user information)
- source/git (git operations)

updates 698acd3

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cmd/buildkitd/main.go

@@ -58,7 +58,6 @@ import (
 	"github.com/moby/buildkit/util/tracing/transform"
 	"github.com/moby/buildkit/version"
 	"github.com/moby/buildkit/worker"
-	"github.com/moby/sys/reexec"
 	"github.com/moby/sys/userns"
 	ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
@@ -81,10 +80,6 @@ func init() {
 	apicaps.ExportedProduct = "buildkit"
 	stack.SetVersionInfo(version.Version, version.Revision)
 
-	if reexec.Init() {
-		os.Exit(0)
-	}
-
 	// enable in memory recording for buildkitd traces
 	detect.Recorder = detect.NewTraceRecorder()
 }

cmd/buildkitd/main_nolinux.go

@@ -0,0 +1,15 @@
+//go:build !linux
+
+package main
+
+import (
+	"os"
+
+	"github.com/moby/sys/reexec"
+)
+
+func init() {
+	if reexec.Init() {
+		os.Exit(0)
+	}
+}