Add kustomize build {repoUrl}

pkg/loader/githubloader.go

@@ -0,0 +1,96 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed 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 loader
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/hashicorp/go-getter"
+
+	"github.com/kubernetes-sigs/kustomize/pkg/fs"
+)
+
+// githubLoader loads files from a checkout github repo
+type githubLoader struct {
+	repo        string
+	checkoutDir string
+	fSys        fs.FileSystem
+	loader      *fileLoader
+}
+
+// Root returns the root location for this Loader.
+func (l *githubLoader) Root() string {
+	return l.checkoutDir
+}
+
+// New delegates to fileLoader.New
+func (l *githubLoader) New(newRoot string) (Loader, error) {
+	return l.loader.New(newRoot)
+}
+
+// Load delegates to fileLoader.Load
+func (l *githubLoader) Load(location string) ([]byte, error) {
+	return l.loader.Load(location)
+}
+
+// Cleanup removes the checked out repo
+func (l *githubLoader) Cleanup() error {
+	return os.RemoveAll(l.checkoutDir)
+}
+
+// newGithubLoader returns a new fileLoader with given github Url.
+func newGithubLoader(repoUrl string, fs fs.FileSystem) (*githubLoader, error) {
+	dir, err := ioutil.TempDir("", "kustomize-")
+	if err != nil {
+		return nil, err
+	}
+	target := filepath.Join(dir, "repo")
+	err = checkout(repoUrl, target)
+	if err != nil {
+		return nil, err
+	}
+	l := newFileLoaderAtRoot(target, fs)
+	return &githubLoader{
+		repo:        repoUrl,
+		checkoutDir: target,
+		fSys:        fs,
+		loader:      l,
+	}, nil
+}
+
+// isRepoUrl checks if a string is a repo Url
+func isRepoUrl(s string) bool {
+	return strings.Contains(s, ".com") || strings.Contains(s, ".org") || strings.Contains(s, "https://")
+}
+
+// Checkout clones a github repo with specified commit/tag/branch
+func checkout(url, dir string) error {
+	pwd, err := os.Getwd()
+	if err != nil {
+		return err
+	}
+	client := &getter.Client{
+		Src:  url,
+		Dst:  dir,
+		Pwd:  pwd,
+		Mode: getter.ClientModeDir,
+	}
+	return client.Get()
+}