printer: dedup warnings

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

tests/bake.go

@@ -45,6 +45,7 @@ var bakeTests = []func(t *testing.T, sb integration.Sandbox){
 	testBakeUlimits,
 	testBakeMetadataProvenance,
 	testBakeMetadataWarnings,
+	testBakeMetadataWarningsDedup,
 	testBakeMultiExporters,
 	testBakeLoadPush,
 }
@@ -778,6 +779,66 @@ target "default" {
 	require.Len(t, md.BuildWarnings, 3)
 }
 
+func testBakeMetadataWarningsDedup(t *testing.T, sb integration.Sandbox) {
+	dockerfile := []byte(`
+frOM busybox as base
+cOpy Dockerfile .
+from scratch
+COPy --from=base \
+  /Dockerfile \
+  /
+	`)
+	bakefile := []byte(`
+group "default" {
+  targets = ["base", "def"]
+}
+target "base" {
+  target = "base"
+}
+target "def" {
+}
+`)
+	dir := tmpdir(
+		t,
+		fstest.CreateFile("docker-bake.hcl", bakefile, 0600),
+		fstest.CreateFile("Dockerfile", dockerfile, 0600),
+	)
+
+	dirDest := t.TempDir()
+
+	cmd := buildxCmd(
+		sb,
+		withDir(dir),
+		withArgs("bake", "--metadata-file", filepath.Join(dirDest, "md.json"), "--set", "*.output=type=none"),
+		withEnv("BUILDX_METADATA_WARNINGS=true"),
+	)
+	out, err := cmd.CombinedOutput()
+	require.NoError(t, err, string(out))
+
+	dt, err := os.ReadFile(filepath.Join(dirDest, "md.json"))
+	require.NoError(t, err)
+
+	type mdT struct {
+		BuildWarnings []client.VertexWarning `json:"buildx.build.warnings"`
+		Base          struct {
+			BuildRef string `json:"buildx.build.ref"`
+		} `json:"base"`
+		Def struct {
+			BuildRef string `json:"buildx.build.ref"`
+		} `json:"def"`
+	}
+	var md mdT
+	err = json.Unmarshal(dt, &md)
+	require.NoError(t, err)
+
+	require.NotEmpty(t, md.Base.BuildRef)
+	require.NotEmpty(t, md.Def.BuildRef)
+	require.NotEmpty(t, md.BuildWarnings)
+
+	skipNoCompatBuildKit(t, sb, ">= 0.14.0-0", "lint")
+	require.Len(t, md.BuildWarnings, 3)
+}
+
 func testBakeMultiExporters(t *testing.T, sb integration.Sandbox) {
 	if !isDockerContainerWorker(sb) {
 		t.Skip("only testing with docker-container worker")

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
+}