Merge pull request #1352 from tonistiigi/windows-build-fix

file: fix compilation on windows

cmd/buildkitd/main_windows.go

@@ -0,0 +1,7 @@
+// +build windows
+
+package main
+
+import (
+	_ "github.com/moby/buildkit/solver/llbsolver/ops"
+)

hack/cross

@@ -26,3 +26,8 @@ buildctl build --progress=plain --frontend=dockerfile.v0 \
    $currentcontextBuildctl \
    --opt platform=$PLATFORMS \
    --import-cache cicache.buildk.it/moby/buildkit/master:binaries-cross-helper
+
+buildctl build --progress=plain --frontend=dockerfile.v0 \
+   $currentcontextBuildctl \
+   --opt platform=windows/amd64 --opt target=buildkit-buildkitd \
+   --import-cache cicache.buildk.it/moby/buildkit/master:binaries

solver/llbsolver/file/user_nolinux.go

@@ -9,6 +9,6 @@ import (
 	copy "github.com/tonistiigi/fsutil/copy"
 )
 
-func readUser(chopt *pb.ChownOpt, mu, mg fileoptypes.Mount) (*copy.ChownOpt, error) {
+func readUser(chopt *pb.ChownOpt, mu, mg fileoptypes.Mount) (*copy.User, error) {
 	return nil, errors.New("only implemented in linux")
 }