printer: dedup warnings

Signed-off-by: CrazyMax <[email protected]>

util/progress/printer.go

@@ -2,6 +2,8 @@ package progress
 
 import (
 	"context"
+	"crypto/sha256"
+	"encoding/hex"
 	"os"
 	"sync"
 
@@ -58,7 +60,7 @@ func (p *Printer) Write(s *client.SolveStatus) {
 }
 
 func (p *Printer) Warnings() []client.VertexWarning {
-	return p.warnings
+	return dedupWarnings(p.warnings)
 }
 
 func (p *Printer) ValidateLogSource(dgst digest.Digest, v interface{}) bool {
@@ -184,3 +186,36 @@ func WithOnClose(onclose func()) PrinterOpt {
 		opt.onclose = onclose
 	}
 }
+
+func dedupWarnings(inp []client.VertexWarning) []client.VertexWarning {
+	m := make(map[string]client.VertexWarning)
+	for _, w := range inp {
+		h := sha256.New()
+		h.Write(w.Short)
+		h.Write([]byte{0})
+		for _, d := range w.Detail {
+			h.Write(d)
+			h.Write([]byte{0})
+		}
+		h.Write([]byte(w.URL))
+		h.Write([]byte{0})
+		for _, r := range w.Range {
+			h.Write([]byte(r.String()))
+			h.Write([]byte{0})
+		}
+		if w.SourceInfo != nil {
+			h.Write([]byte(w.SourceInfo.Filename))
+			h.Write([]byte(w.SourceInfo.Data))
+		}
+		h.Write([]byte{0})
+		hkey := hex.EncodeToString(h.Sum(nil))
+		if _, ok := m[hkey]; !ok {
+			m[hkey] = w
+		}
+	}
+	res := make([]client.VertexWarning, 0, len(m))
+	for _, w := range m {
+		res = append(res, w)
+	}
+	return res
+}