update print to include lint subcommand

Signed-off-by: Talon Bowler <[email protected]>

frontend/dockerfile/builder/build.go

@@ -15,6 +15,7 @@ import (
 	"github.com/moby/buildkit/frontend/dockerui"
 	"github.com/moby/buildkit/frontend/gateway/client"
 	gwpb "github.com/moby/buildkit/frontend/gateway/pb"
+	"github.com/moby/buildkit/frontend/subrequests/lint"
 	"github.com/moby/buildkit/frontend/subrequests/outline"
 	"github.com/moby/buildkit/frontend/subrequests/targets"
 	"github.com/moby/buildkit/solver/errdefs"
@@ -85,6 +86,10 @@ func Build(ctx context.Context, c client.Client) (_ *client.Result, err error) {
 		ListTargets: func(ctx context.Context) (*targets.List, error) {
 			return dockerfile2llb.ListTargets(ctx, src.Data)
 		},
+		Lint: func(ctx context.Context) (*lint.LintResults, error) {
+			warnings, err := dockerfile2llb.DockerfileLint(ctx, src.Data, convertOpt)
+			return &lint.LintResults{Warnings: warnings}, err
+		},
 	}); err != nil {
 		return nil, err
 	} else if ok {

frontend/dockerfile/dockerfile2llb/convert.go

@@ -26,6 +26,7 @@ import (
 	"github.com/moby/buildkit/frontend/dockerfile/parser"
 	"github.com/moby/buildkit/frontend/dockerfile/shell"
 	"github.com/moby/buildkit/frontend/dockerui"
+	"github.com/moby/buildkit/frontend/subrequests/lint"
 	"github.com/moby/buildkit/frontend/subrequests/outline"
 	"github.com/moby/buildkit/frontend/subrequests/targets"
 	"github.com/moby/buildkit/identity"
@@ -110,6 +111,34 @@ func Dockefile2Outline(ctx context.Context, dt []byte, opt ConvertOpt) (*outline
 	return &o, nil
 }
 
+func DockerfileLint(ctx context.Context, dt []byte, opt ConvertOpt) ([]lint.Warning, error) {
+	warnings := []lint.Warning{}
+	sourceData := strings.Split(string(opt.SourceMap.Data), "\n")
+	opt.Warn = func(short, url string, detail [][]byte, location []parser.Range) {
+		var rulename, ruledetail string
+		if strings.HasPrefix(short, "Lint Rule ") {
+			rulename = strings.TrimPrefix(short, "Lint Rule ")
+			ruleParts := strings.Split(rulename, ":")
+			rulename = strings.Trim(ruleParts[0], "'")
+			ruledetail = strings.TrimSpace(ruleParts[1])
+		} else {
+			return
+		}
+		warnings = append(warnings, lint.Warning{
+			RuleName:  rulename,
+			Detail:    ruledetail,
+			Filename:  opt.SourceMap.Filename,
+			Source:    sourceData[location[0].Start.Line-1 : location[0].End.Line],
+			StartLine: location[0].Start.Line,
+		})
+	}
+	_, err := toDispatchState(ctx, dt, opt)
+	if err != nil {
+		return nil, err
+	}
+	return warnings, nil
+}
+
 func ListTargets(ctx context.Context, dt []byte) (*targets.List, error) {
 	dockerfile, err := parser.Parse(bytes.NewReader(dt))
 	if err != nil {