Add notice generator target to mage and a NOTICE.txt file (#38)

Author: kvch

NOTICE.txt

@@ -1,18 +1,36 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
 package mage
 
 import (
 	"fmt"
 
 	"github.com/magefile/mage/mg"
-	"github.com/magefile/mage/sh"
+
+	"github.com/elastic/elastic-agent-libs/dev-tools/mage/gotool"
 )
 
 // Deps contains targets related to checking dependencies
 type Deps mg.Namespace
 
 // CheckModuleTidy checks if `go mod tidy` was run before the last commit.
 func (Deps) CheckModuleTidy() error {
-	err := sh.Run("go", "mod", "tidy")
+	err := gotool.Mod.Tidy()
 	if err != nil {
 		return err
 	}

dev-tools/mage/deps.go

@@ -0,0 +1,43 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package gotool
+
+type goGet func(opts ...ArgOpt) error
+type goDownload func(opts ...ArgOpt) error
+
+// Get runs `go get` and provides optionals for adding command line arguments.
+var Get goGet = runGoGet
+
+func runGoGet(opts ...ArgOpt) error {
+	args := buildArgs(opts)
+	return runVGo("get", args)
+}
+
+func (goGet) Download() ArgOpt          { return flagBoolIf("-d", true) }
+func (goGet) Update() ArgOpt            { return flagBoolIf("-u", true) }
+func (goGet) Package(pkg string) ArgOpt { return posArg(pkg) }
+
+// Download runs `go download` and provides optionals for adding command line arguments.
+var Download goDownload = runGoDownload
+
+func runGoDownload(opts ...ArgOpt) error {
+	args := buildArgs(opts)
+	return runVGo("download", args)
+}
+
+func (goDownload) All() ArgOpt { return posArg("all") }