pkg/guid: Improve error messages

Signed-off-by: Kevin Parsons <kevpar@microsoft.com>

pkg/guid/guid.go

@@ -13,7 +13,6 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/pkg/errors"
 	"golang.org/x/sys/windows"
 )
 
@@ -115,36 +114,36 @@ func (g GUID) String() string {
 // format.
 func FromString(s string) (GUID, error) {
 	if len(s) != 36 {
-		return GUID{}, errors.New("invalid GUID format (length)")
+		return GUID{}, fmt.Errorf("invalid GUID %q", s)
 	}
 	if s[8] != '-' || s[13] != '-' || s[18] != '-' || s[23] != '-' {
-		return GUID{}, errors.New("invalid GUID format (dashes)")
+		return GUID{}, fmt.Errorf("invalid GUID %q", s)
 	}
 
 	var g GUID
 
 	data1, err := strconv.ParseUint(s[0:8], 16, 32)
 	if err != nil {
-		return GUID{}, errors.Wrap(err, "invalid GUID format (Data1)")
+		return GUID{}, fmt.Errorf("invalid GUID %q", s)
 	}
 	g.Data1 = uint32(data1)
 
 	data2, err := strconv.ParseUint(s[9:13], 16, 16)
 	if err != nil {
-		return GUID{}, errors.Wrap(err, "invalid GUID format (Data2)")
+		return GUID{}, fmt.Errorf("invalid GUID %q", s)
 	}
 	g.Data2 = uint16(data2)
 
 	data3, err := strconv.ParseUint(s[14:18], 16, 16)
 	if err != nil {
-		return GUID{}, errors.Wrap(err, "invalid GUID format (Data3)")
+		return GUID{}, fmt.Errorf("invalid GUID %q", s)
 	}
 	g.Data3 = uint16(data3)
 
 	for i, x := range []int{19, 21, 24, 26, 28, 30, 32, 34} {
 		v, err := strconv.ParseUint(s[x:x+2], 16, 8)
 		if err != nil {
-			return GUID{}, errors.Wrap(err, "invalid GUID format (Data4)")
+			return GUID{}, fmt.Errorf("invalid GUID %q", s)
 		}
 		g.Data4[i] = uint8(v)
 	}