242 lines
7.2 KiB
Go
242 lines
7.2 KiB
Go
// Copyright (C) 2016-2019 Vincent Ambo <mail@tazj.in>
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//
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// Kontemplate is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package main
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import (
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"fmt"
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"os"
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"os/exec"
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"strings"
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"github.com/tazjin/kontemplate/context"
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"github.com/tazjin/kontemplate/templater"
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"gopkg.in/alecthomas/kingpin.v2"
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)
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const version string = "1.8.0"
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// This variable will be initialised by the Go linker during the builder
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var gitHash string
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var (
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app = kingpin.New("kontemplate", "simple Kubernetes resource templating")
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// Global flags
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includes = app.Flag("include", "Resource sets to include explicitly").Short('i').Strings()
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excludes = app.Flag("exclude", "Resource sets to exclude explicitly").Short('e').Strings()
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variables = app.Flag("var", "Provide variables to templates explicitly").Strings()
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kubectlBin = app.Flag("kubectl", "Path to the kubectl binary (default 'kubectl')").Default("kubectl").String()
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// Commands
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template = app.Command("template", "Template resource sets and print them")
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templateFile = template.Arg("file", "Cluster configuration file to use").Required().String()
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templateOutputDir = template.Flag("output", "Output directory in which to save templated files instead of printing them").Short('o').String()
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apply = app.Command("apply", "Template resources and pass to 'kubectl apply'")
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applyFile = apply.Arg("file", "Cluster configuration file to use").Required().String()
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applyDryRun = apply.Flag("dry-run", "Print remote operations without executing them").Default("false").Bool()
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replace = app.Command("replace", "Template resources and pass to 'kubectl replace'")
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replaceFile = replace.Arg("file", "Cluster configuration file to use").Required().String()
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delete = app.Command("delete", "Template resources and pass to 'kubectl delete'")
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deleteFile = delete.Arg("file", "Cluster configuration file to use").Required().String()
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create = app.Command("create", "Template resources and pass to 'kubectl create'")
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createFile = create.Arg("file", "Cluster configuration file to use").Required().String()
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versionCmd = app.Command("version", "Show kontemplate version")
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)
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func main() {
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app.HelpFlag.Short('h')
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switch kingpin.MustParse(app.Parse(os.Args[1:])) {
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case template.FullCommand():
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templateCommand()
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case apply.FullCommand():
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applyCommand()
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case replace.FullCommand():
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replaceCommand()
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case delete.FullCommand():
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deleteCommand()
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case create.FullCommand():
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createCommand()
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case versionCmd.FullCommand():
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versionCommand()
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}
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}
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func versionCommand() {
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if gitHash == "" {
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fmt.Printf("Kontemplate version %s (git commit unknown)\n", version)
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} else {
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fmt.Printf("Kontemplate version %s (git commit: %s)\n", version, gitHash)
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}
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}
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func templateCommand() {
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_, resourceSets := loadContextAndResources(templateFile)
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for _, rs := range *resourceSets {
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if len(rs.Resources) == 0 {
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fmt.Fprintf(os.Stderr, "Warning: Resource set '%s' does not exist or contains no valid templates\n", rs.Name)
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continue
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}
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if *templateOutputDir != "" {
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templateIntoDirectory(templateOutputDir, rs)
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} else {
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for _, r := range rs.Resources {
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fmt.Fprintf(os.Stderr, "Rendered file %s/%s:\n", rs.Name, r.Filename)
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fmt.Println(r.Rendered)
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}
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}
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}
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}
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func templateIntoDirectory(outputDir *string, rs templater.RenderedResourceSet) {
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// Attempt to create the output directory if it does not
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// already exist:
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if err := os.MkdirAll(*templateOutputDir, 0775); err != nil {
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app.Fatalf("Could not create output directory: %v\n", err)
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}
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// Nested resource sets may contain slashes in their names.
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// These are replaced with dashes for the purpose of writing a
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// flat list of output files:
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setName := strings.Replace(rs.Name, "/", "-", -1)
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for _, r := range rs.Resources {
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filename := fmt.Sprintf("%s/%s-%s", *templateOutputDir, setName, r.Filename)
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fmt.Fprintf(os.Stderr, "Writing file %s\n", filename)
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file, err := os.Create(filename)
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if err != nil {
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app.Fatalf("Could not create file %s: %v\n", filename, err)
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}
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_, err = fmt.Fprintf(file, r.Rendered)
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if err != nil {
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app.Fatalf("Error writing file %s: %v\n", filename, err)
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}
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}
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}
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func applyCommand() {
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ctx, resources := loadContextAndResources(applyFile)
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var kubectlArgs []string
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if *applyDryRun {
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kubectlArgs = []string{"apply", "-f", "-", "--dry-run"}
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} else {
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kubectlArgs = []string{"apply", "-f", "-"}
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}
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if err := runKubectlWithResources(ctx, &kubectlArgs, resources); err != nil {
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failWithKubectlError(err)
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}
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}
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func replaceCommand() {
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ctx, resources := loadContextAndResources(replaceFile)
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args := []string{"replace", "--save-config=true", "-f", "-"}
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if err := runKubectlWithResources(ctx, &args, resources); err != nil {
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failWithKubectlError(err)
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}
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}
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func deleteCommand() {
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ctx, resources := loadContextAndResources(deleteFile)
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args := []string{"delete", "-f", "-"}
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if err := runKubectlWithResources(ctx, &args, resources); err != nil {
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failWithKubectlError(err)
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}
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}
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func createCommand() {
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ctx, resources := loadContextAndResources(createFile)
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args := []string{"create", "--save-config=true", "-f", "-"}
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if err := runKubectlWithResources(ctx, &args, resources); err != nil {
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failWithKubectlError(err)
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}
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}
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func loadContextAndResources(file *string) (*context.Context, *[]templater.RenderedResourceSet) {
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ctx, err := context.LoadContext(*file, variables)
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if err != nil {
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app.Fatalf("Error loading context: %v\n", err)
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}
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resources, err := templater.LoadAndApplyTemplates(includes, excludes, ctx)
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if err != nil {
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app.Fatalf("Error templating resource sets: %v\n", err)
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}
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return ctx, &resources
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}
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func runKubectlWithResources(c *context.Context, kubectlArgs *[]string, resourceSets *[]templater.RenderedResourceSet) error {
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argsWithContext := append(*kubectlArgs, fmt.Sprintf("--context=%s", c.Name))
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for _, rs := range *resourceSets {
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if len(rs.Resources) == 0 {
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fmt.Fprintf(os.Stderr, "Warning: Resource set '%s' contains no valid templates\n", rs.Name)
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continue
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}
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argsWithResourceSetArgs := append(argsWithContext, rs.Args...)
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kubectl := exec.Command(*kubectlBin, argsWithResourceSetArgs...)
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stdin, err := kubectl.StdinPipe()
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if err != nil {
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return fmt.Errorf("kubectl error: %v", err)
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}
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kubectl.Stdout = os.Stdout
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kubectl.Stderr = os.Stderr
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if err = kubectl.Start(); err != nil {
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return fmt.Errorf("kubectl error: %v", err)
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}
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for _, r := range rs.Resources {
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fmt.Printf("Passing file %s/%s to kubectl\n", rs.Name, r.Filename)
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fmt.Fprintln(stdin, r.Rendered)
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}
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stdin.Close()
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if err = kubectl.Wait(); err != nil {
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return err
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}
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}
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return nil
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}
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func failWithKubectlError(err error) {
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app.Fatalf("Kubectl error: %v\n", err)
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}
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