add support for diff revisions over cli

cli/cmd/compare-revisions.go

@@ -0,0 +1,111 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+
+	api "github.com/porter-dev/porter/api/client"
+	"github.com/porter-dev/porter/api/types"
+	"github.com/spf13/cobra"
+)
+
+var compareRevisionsCmd = &cobra.Command{
+	Use:   "compare-revisions",
+	Short: "Compare two revisions of a release. Arguments must be in the form: porter compare-revisions <release-name> <base-revision-number> <changed-revision-number>",
+	Run: func(cmd *cobra.Command, args []string) {
+		err := checkLoginAndRun(args, runCompareRevisions)
+
+		if err != nil {
+			os.Exit(1)
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(compareRevisionsCmd)
+}
+
+func runCompareRevisions(_ *types.GetAuthenticatedUserResponse, client *api.Client, args []string) error {
+	_, err := exec.LookPath("helm")
+
+	if err != nil {
+		return fmt.Errorf("error finding helm: %w", err)
+	}
+
+	_, err = exec.LookPath("colordiff")
+
+	if err != nil {
+		return fmt.Errorf("error finding colordiff: %w", err)
+	}
+
+	tmpFile, err := downloadTempKubeconfig(client)
+
+	if err != nil {
+		return err
+	}
+
+	defer func() {
+		os.Remove(tmpFile)
+	}()
+
+	if len(args) != 3 {
+		return fmt.Errorf("arguments must be in the form: porter compare-revisions <release-name> <base-revision-number> <changed-revision-number>")
+	}
+
+	os.Setenv("KUBECONFIG", tmpFile)
+
+	baseConfig, err := exec.Command("helm", []string{"get", "values", args[0], "--revision", args[1]}...).Output()
+
+	if err != nil {
+		return fmt.Errorf("error retrieving revision %s for release with name %s: %w", args[0], args[1], err)
+	}
+
+	changedConfig, err := exec.Command("helm", []string{"get", "values", args[0], "--revision", args[2]}...).Output()
+
+	if err != nil {
+		return fmt.Errorf("error retrieving revision %s for release with name %s: %w", args[0], args[2], err)
+	}
+
+	baseTmpFile, err := createTempFile("base-config", baseConfig)
+	if err != nil {
+		return fmt.Errorf("error creating base temp file: %w", err)
+	}
+
+	defer baseTmpFile.Close()
+	defer os.Remove(baseTmpFile.Name())
+
+	changedTmpFile, err := createTempFile("changed-config", changedConfig)
+	if err != nil {
+		return fmt.Errorf("error creating changed temp file: %w", err)
+	}
+
+	defer changedTmpFile.Close()
+	defer os.Remove(changedTmpFile.Name())
+
+	cmd := exec.Command("colordiff", baseTmpFile.Name(), changedTmpFile.Name(), "-y")
+
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	err = cmd.Run()
+
+	// colordiff returns exit status 1 if there are differences
+	if err != nil && err.Error() != "exit status 1" {
+		return fmt.Errorf("error running diff: %w", err)
+	}
+
+	return nil
+}
+
+func createTempFile(prefix string, config []byte) (*os.File, error) {
+	tmpFile, err := os.CreateTemp("", prefix)
+	if err != nil {
+		return nil, fmt.Errorf("error creating temp file: %w", err)
+	}
+
+	if err := os.WriteFile(tmpFile.Name(), config, 0644); err != nil {
+		return nil, fmt.Errorf("error writing to temp file: %w", err)
+	}
+
+	return tmpFile, nil
+}

dashboard/src/components/YamlEditor.tsx

@@ -4,6 +4,7 @@ import AceEditor from "react-ace";
 
 import "shared/ace-porter-theme";
 import "ace-builds/src-noconflict/mode-yaml";
+import 'brace/ext/searchbox';
 
 type PropsType = {
   value: string;