bootstrap script should be executed on the host agent

agent/cloudinit/cloudinit.go

@@ -1,8 +1,13 @@
 package cloudinit
 
 import (
+	"bytes"
+	"compress/gzip"
+	"encoding/base64"
 	"fmt"
+	"io"
 	"path/filepath"
+	"strings"
 
 	"github.com/pkg/errors"
 	"sigs.k8s.io/yaml"
@@ -14,17 +19,17 @@ type ScriptExecutor struct {
 }
 
 type bootstrapConfig struct {
-	FilesToWrite      []files  `json:"write_files"`
+	FilesToWrite      []Files  `json:"write_files"`
 	CommandsToExecute []string `json:"runCmd"`
 }
 
-type files struct {
-	Path string `json:"path,"`
-	// Encoding    string `json:"encoding,omitempty"`
-	// Owner       string `json:"owner,omitempty"`
-	// Permissions string `json:"permissions,omitempty"`
-	Content string `json:"content"`
-	//Append      bool   `json:"append,"`
+type Files struct {
+	Path        string `json:"path,"`
+	Encoding    string `json:"encoding,omitempty"`
+	Owner       string `json:"owner,omitempty"`
+	Permissions string `json:"permissions,omitempty"`
+	Content     string `json:"content"`
+	Append      bool   `json:"append,omitempty"`
 }
 
 func (se ScriptExecutor) Execute(bootstrapScript string) error {
@@ -40,7 +45,12 @@ func (se ScriptExecutor) Execute(bootstrapScript string) error {
 			return errors.Wrap(err, fmt.Sprintf("Error creating the directory %s", directoryToCreate))
 		}
 
-		err = se.WriteFilesExecutor.WriteToFile(file.Path, file.Content)
+		encodings := parseEncodingScheme(file.Encoding)
+		file.Content, err = decodeContent(file.Content, encodings)
+		if err != nil {
+			return errors.Wrap(err, fmt.Sprintf("error decoding content for %s", file.Path))
+		}
+		err = se.WriteFilesExecutor.WriteToFile(file)
 		if err != nil {
 			return errors.Wrap(err, fmt.Sprintf("Error writing the file %s", file.Path))
 		}
@@ -54,3 +64,59 @@ func (se ScriptExecutor) Execute(bootstrapScript string) error {
 	}
 	return nil
 }
+
+func parseEncodingScheme(e string) []string {
+	e = strings.ToLower(e)
+	e = strings.TrimSpace(e)
+
+	switch e {
+	case "gz+base64", "gzip+base64", "gz+b64", "gzip+b64":
+		return []string{"application/base64", "application/x-gzip"}
+	case "base64", "b64":
+		return []string{"application/base64"}
+	}
+
+	return []string{"text/plain"}
+}
+
+func decodeContent(content string, encodings []string) (string, error) {
+	for _, e := range encodings {
+		switch e {
+		case "application/base64":
+			rByte, err := base64.StdEncoding.DecodeString(content)
+			if err != nil {
+				return content, errors.WithStack(err)
+			}
+			content = string(rByte)
+		case "application/x-gzip":
+			rByte, err := gUnzipData([]byte(content))
+			if err != nil {
+				return content, err
+			}
+			content = string(rByte)
+		case "text/plain":
+			continue
+		default:
+			return content, errors.Errorf("Unknown bootstrap data encoding: %q", content)
+		}
+	}
+	return content, nil
+}
+
+func gUnzipData(data []byte) ([]byte, error) {
+	var r io.Reader
+	var err error
+	b := bytes.NewBuffer(data)
+	r, err = gzip.NewReader(b)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	var resB bytes.Buffer
+	_, err = resB.ReadFrom(r)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	return resB.Bytes(), nil
+}

agent/cloudinit/cloudinit_test.go

@@ -1,30 +1,31 @@
 package cloudinit_test
 
 import (
+	"encoding/base64"
 	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
-
 	"github.com/vmware-tanzu/cluster-api-provider-byoh/agent/cloudinit"
 	"github.com/vmware-tanzu/cluster-api-provider-byoh/agent/cloudinit/cloudinitfakes"
 )
 
-var someBootstrapSecret = `
-write_files:
--   path: /tmp/file1.txt
-    content: some-content
-runCmd:
--   echo 'some run command'
-`
-
 var _ = Describe("Cloudinit", func() {
+	var (
+		workDir string
+		err     error
+	)
+
 	Context("Testing write_files and runCmd directives of cloudinit", func() {
 		var (
-			fakeFileWriter  *cloudinitfakes.FakeIFileWriter
-			fakeCmdExecutor *cloudinitfakes.FakeICmdRunner
-			scriptExecutor  cloudinit.ScriptExecutor
-			err             error
+			fakeFileWriter         *cloudinitfakes.FakeIFileWriter
+			fakeCmdExecutor        *cloudinitfakes.FakeICmdRunner
+			scriptExecutor         cloudinit.ScriptExecutor
+			defaultBootstrapSecret string
 		)
 
 		BeforeEach(func() {
@@ -34,31 +35,63 @@ var _ = Describe("Cloudinit", func() {
 				WriteFilesExecutor: fakeFileWriter,
 				RunCmdExecutor:     fakeCmdExecutor,
 			}
+
+			defaultBootstrapSecret = fmt.Sprintf(`write_files:
+- path: %s/defaultFile.txt
+  content: some-content
+runCmd:
+- echo 'some run command'`, workDir)
+
+			workDir, err = ioutil.TempDir("", "cloudinit_ut")
+			Expect(err).ToNot(HaveOccurred())
+		})
+
+		AfterEach(func() {
+			err := os.RemoveAll(workDir)
+			Expect(err).ToNot(HaveOccurred())
 		})
 
 		It("should write files successfully", func() {
-			bootstrapSecretUnencoded := `write_files:
--   path: /tmp/a/file1.txt
-    content: some-content
--   path: /tmp/b/file2.txt
-    content: whatever`
+			fileDir1 := path.Join(workDir, "dir1")
+			fileName1 := path.Join(fileDir1, "file1.txt")
+			fileContent1 := "some-content-1"
+
+			fileDir2 := path.Join(workDir, "dir2")
+			fileName2 := path.Join(fileDir2, "file2.txt")
+			fileContent2 := "some-content-2"
+			fileBase64Content := base64.StdEncoding.EncodeToString([]byte(fileContent2))
+			permissions := "0777"
+			encoding := "base64"
+
+			bootstrapSecretUnencoded := fmt.Sprintf(`write_files:
+- path: %s
+  content: %s
+- path: %s
+  content: %s
+  permissions: '%s'
+  append: true
+  encoding: %s`, fileName1, fileContent1, fileName2, fileBase64Content, permissions, encoding)
+
 			err = scriptExecutor.Execute(bootstrapSecretUnencoded)
 			Expect(err).ToNot(HaveOccurred())
 
 			Expect(fakeFileWriter.MkdirIfNotExistsCallCount()).To(Equal(2))
 			Expect(fakeFileWriter.WriteToFileCallCount()).To(Equal(2))
 
 			dirNameForFirstFile := fakeFileWriter.MkdirIfNotExistsArgsForCall(0)
-			Expect(dirNameForFirstFile).To(Equal("/tmp/a"))
-			firstFileName, firstFileContents := fakeFileWriter.WriteToFileArgsForCall(0)
-			Expect(firstFileName).To(Equal("/tmp/a/file1.txt"))
-			Expect(firstFileContents).To(Equal("some-content"))
+			Expect(dirNameForFirstFile).To(Equal(fileDir1))
+			firstFile := fakeFileWriter.WriteToFileArgsForCall(0)
+			Expect(firstFile.Path).To(Equal(fileName1))
+			Expect(firstFile.Content).To(Equal(fileContent1))
 
 			dirNameForSecondFile := fakeFileWriter.MkdirIfNotExistsArgsForCall(1)
-			Expect(dirNameForSecondFile).To(Equal("/tmp/b"))
-			secondFileName, secondFileContents := fakeFileWriter.WriteToFileArgsForCall(1)
-			Expect(secondFileName).To(Equal("/tmp/b/file2.txt"))
-			Expect(secondFileContents).To(Equal("whatever"))
+			Expect(dirNameForSecondFile).To(Equal(fileDir2))
+			secondFile := fakeFileWriter.WriteToFileArgsForCall(1)
+			Expect(secondFile.Path).To(Equal(fileName2))
+			Expect(secondFile.Content).To(Equal(fileContent2))
+			Expect(secondFile.Permissions).To(Equal(permissions))
+			Expect(secondFile.Append).To(BeTrue())
+
 		})
 
 		It("should error out when an invalid yaml is passed", func() {
@@ -71,7 +104,7 @@ var _ = Describe("Cloudinit", func() {
 		It("should error out when there is not enough permission to mkdir", func() {
 			fakeFileWriter.MkdirIfNotExistsReturns(errors.New("not enough permissions"))
 
-			err := scriptExecutor.Execute(someBootstrapSecret)
+			err := scriptExecutor.Execute(defaultBootstrapSecret)
 
 			Expect(err).To(HaveOccurred())
 			Expect(err.Error()).To(ContainSubstring("not enough permissions"))
@@ -82,14 +115,14 @@ var _ = Describe("Cloudinit", func() {
 		It("should error out write to file failes", func() {
 			fakeFileWriter.WriteToFileReturns(errors.New("cannot write to file"))
 
-			err := scriptExecutor.Execute(someBootstrapSecret)
+			err := scriptExecutor.Execute(defaultBootstrapSecret)
 
 			Expect(err).To(HaveOccurred())
 			Expect(err.Error()).To(ContainSubstring("cannot write to file"))
 		})
 
 		It("run the command given in the runCmd directive", func() {
-			err := scriptExecutor.Execute(someBootstrapSecret)
+			err := scriptExecutor.Execute(defaultBootstrapSecret)
 			Expect(err).ToNot(HaveOccurred())
 
 			Expect(fakeCmdExecutor.RunCmdCallCount()).To(Equal(1))
@@ -108,9 +141,8 @@ var _ = Describe("Cloudinit", func() {
 		})
 
 		It("should error out when command execution fails", func() {
-
 			fakeCmdExecutor.RunCmdReturns(errors.New("command execution failed"))
-			err := scriptExecutor.Execute(someBootstrapSecret)
+			err := scriptExecutor.Execute(defaultBootstrapSecret)
 			Expect(err).To(HaveOccurred())
 
 			Expect(fakeCmdExecutor.RunCmdCallCount()).To(Equal(1))

agent/cloudinit/cmd_runner.go

@@ -15,13 +15,18 @@ type CmdRunner struct {
 }
 
 func (r CmdRunner) RunCmd(cmd string) error {
+	subStrs := []string{"kubeadm init", "kubeadm join"}
 
-	if strings.Contains(cmd, "kubeadm") {
-		cmd = "kubeadm join --config /run/kubeadm/kubeadm-join-config.yaml  --ignore-preflight-errors=all && echo success > /run/cluster-api/bootstrap-success.complete"
+	for _, subStr := range subStrs {
+		if strings.Contains(cmd, subStr) {
+			index := strings.Index(cmd, subStr)
+			index += len(subStr)
+			newCmd := cmd[:index] + " --ignore-preflight-errors=all " + cmd[index:]
+			cmd = newCmd
+		}
 	}
 	command := exec.Command("/bin/sh", "-c", cmd)
 	output, err := command.Output()
 	fmt.Println(string(output))
 	return err
-
 }