Fix windows build

cache/contenthash/filehash.go

@@ -8,7 +8,6 @@ import (
 	"path/filepath"
 	"time"
 
-	"github.com/stevvooe/continuity/sysx"
 	"github.com/tonistiigi/fsutil"
 )
 
@@ -30,22 +29,9 @@ func NewFileHash(path string, fi os.FileInfo) (hash.Hash, error) {
 		Linkname: link,
 	}
 
-	setUnixOpt(fi, stat)
-
-	attrs, err := sysx.LListxattr(path)
-	if err != nil {
+	if err := setUnixOpt(path, fi, stat); err != nil {
 		return nil, err
 	}
-	if len(attrs) > 0 {
-		stat.Xattrs = map[string][]byte{}
-		for _, attr := range attrs {
-			v, err := sysx.LGetxattr(path, attr)
-			if err == nil {
-				stat.Xattrs[attr] = v
-			}
-		}
-	}
-
 	return NewFromStat(stat)
 }
 

cache/contenthash/filehash_unix.go

@@ -6,14 +6,15 @@ import (
 	"os"
 	"syscall"
 
+	"github.com/stevvooe/continuity/sysx"
 	"github.com/tonistiigi/fsutil"
 )
 
 func chmodWindowsTarEntry(perm os.FileMode) os.FileMode {
 	return perm
 }
 
-func setUnixOpt(fi os.FileInfo, stat *fsutil.Stat) {
+func setUnixOpt(path string, fi os.FileInfo, stat *fsutil.Stat) error {
 	s := fi.Sys().(*syscall.Stat_t)
 
 	stat.Uid = s.Uid
@@ -26,6 +27,21 @@ func setUnixOpt(fi os.FileInfo, stat *fsutil.Stat) {
 			stat.Devminor = int64(minor(uint64(s.Rdev)))
 		}
 	}
+
+	attrs, err := sysx.LListxattr(path)
+	if err != nil {
+		return err
+	}
+	if len(attrs) > 0 {
+		stat.Xattrs = map[string][]byte{}
+		for _, attr := range attrs {
+			v, err := sysx.LGetxattr(path, attr)
+			if err == nil {
+				stat.Xattrs[attr] = v
+			}
+		}
+	}
+	return nil
 }
 
 func major(device uint64) uint64 {

cache/contenthash/filehash_windows.go

@@ -18,5 +18,6 @@ func chmodWindowsTarEntry(perm os.FileMode) os.FileMode {
 	return perm
 }
 
-func setUnixOpt(fi os.FileInfo, stat *fsutil.Stat) {
+func setUnixOpt(path string, fi os.FileInfo, stat *fsutil.Stat) error {
+	return nil
 }

worker/oci/spec_unix.go

@@ -1,3 +1,5 @@
+// +build !windows
+
 package oci
 
 import (