feat(tools/cosmovisor): Add ShowUpgradeInfoCmd (#21932)

Co-authored-by: Bastien Rigaud <bastienrigaud@mbp-de-bastien.home>

tools/cosmovisor/CHANGELOG.md

@@ -40,6 +40,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 * [#21462](https://github.com/cosmos/cosmos-sdk/pull/21462) Pass `stdin` to binary.
 
+### Features
+
+* [#21932](https://github.com/cosmos/cosmos-sdk/pull/21932) Add `cosmovisor show-upgrade-info` command to display the upgrade-info.json into stdout.
+
 ## v1.6.0 - 2024-08-12
 
 ## Improvements

tools/cosmovisor/cmd/cosmovisor/root.go

@@ -19,6 +19,7 @@ func NewRootCmd() *cobra.Command {
 		configCmd,
 		NewVersionCmd(),
 		NewAddUpgradeCmd(),
+		NewShowUpgradeInfoCmd(),
 	)
 
 	rootCmd.PersistentFlags().StringP(cosmovisor.FlagCosmovisorConfig, "c", "", "path to cosmovisor config file")

tools/cosmovisor/cmd/cosmovisor/show_upgrade.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+
+	"cosmossdk.io/tools/cosmovisor"
+)
+
+func NewShowUpgradeInfoCmd() *cobra.Command {
+	showUpgradeInfo := &cobra.Command{
+		Use:          "show-upgrade-info",
+		Short:        "Show upgrade-info.json into stdout.",
+		SilenceUsage: false,
+		Args:         cobra.NoArgs,
+		RunE:         showUpgradeInfoCmd,
+	}
+
+	return showUpgradeInfo
+}
+
+func showUpgradeInfoCmd(cmd *cobra.Command, args []string) error {
+	configPath, err := cmd.Flags().GetString(cosmovisor.FlagCosmovisorConfig)
+	if err != nil {
+		return fmt.Errorf("failed to get config flag: %w", err)
+	}
+
+	cfg, err := cosmovisor.GetConfigFromFile(configPath)
+	if err != nil {
+		return err
+	}
+
+	data, err := os.ReadFile(cfg.UpgradeInfoFilePath())
+	if err != nil {
+		if os.IsNotExist(err) {
+			return fmt.Errorf("upgrade-info.json not found at %s: %w", args[0], err)
+		}
+		return fmt.Errorf("failed to read upgrade-info.json: %w", err)
+	}
+
+	_, err = fmt.Fprintln(cmd.OutOrStdout(), string(data))
+	if err != nil {
+		return fmt.Errorf("failed to write output: %w", err)
+	}
+
+	return nil
+}