Merge pull request #438 from dubo-dubon-duponey/build

Support for target & hosts (#DockerBuild)

dagger/pipeline.go

@@ -842,6 +842,32 @@ func dockerBuildOpts(op *compiler.Value) (map[string]string, error) {
 		opts["filename"] = filename
 	}
 
+	if target := op.Lookup("target"); target.Exists() {
+		tgr, err := target.String()
+		if err != nil {
+			return nil, err
+		}
+		opts["target"] = tgr
+	}
+
+	if hosts := op.Lookup("hosts"); hosts.Exists() {
+		p := []string{}
+		fields, err := hosts.Fields()
+		if err != nil {
+			return nil, err
+		}
+		for _, host := range fields {
+			s, err := host.Value.String()
+			if err != nil {
+				return nil, err
+			}
+			p = append(p, host.Label()+"="+s)
+		}
+		if len(p) > 0 {
+			opts["add-hosts"] = strings.Join(p, ",")
+		}
+	}
+
 	if buildArgs := op.Lookup("buildArg"); buildArgs.Exists() {
 		fields, err := buildArgs.Fields()
 		if err != nil {

stdlib/dagger/op/op.cue

@@ -92,6 +92,8 @@ package op
 	platforms?: [...string]
 	buildArg?: [string]: string
 	label?: [string]:    string
+	target?: string
+	hosts?: [string]: string
 }
 
 #WriteFile: {