offline-update: Add command to print info about bundle

Signed-off-by: Mike Sul <[email protected]>

subcommands/targets/offline-update.go

@@ -32,6 +32,16 @@ type (
 		buildTag      string
 		fetchedApps   *client.FetchedApps
 	}
+
+	ouBundleMeta struct {
+		Type    string   `json:"type"`
+		Tag     string   `json:"tag"`
+		Targets []string `json:"targets"`
+	}
+	ouBundleTufMeta struct {
+		tuf.SignedCommon
+		ouBundleMeta `json:"x-fio-offline-bundle"`
+	}
 )
 
 var (
@@ -80,6 +90,7 @@ func init() {
 	offlineUpdateCmd.MarkFlagsMutuallyExclusive("tag", "wave")
 	offlineUpdateCmd.MarkFlagsMutuallyExclusive("prod", "wave")
 	initSignCmd(offlineUpdateCmd)
+	initCheckCmd(offlineUpdateCmd)
 }
 
 func initSignCmd(parentCmd *cobra.Command) {
@@ -100,6 +111,56 @@ and is printed by this command.`,
 	parentCmd.AddCommand(signCmd)
 }
 
+func initCheckCmd(parentCmd *cobra.Command) {
+	checkCmd := &cobra.Command{
+		Use:   "check <path to an offline bundle>",
+		Short: "Check and print info about an offline bundle",
+		Long: `Check and print info about an offline bundle.
+
+Run this command if you would like to get information about an offline bundle.
+Specifically, what targets it includes, what the type of the targets (CI or production),
+a bundle's expiration time', etc.`,
+		Run:  doCheckBundle,
+		Args: cobra.ExactArgs(1),
+	}
+	parentCmd.AddCommand(checkCmd)
+}
+
+func doCheckBundle(cmd *cobra.Command, args []string) {
+	tufMetaPath := path.Join(args[0], "tuf")
+	bundleTufMeta, err := getBundleTargetsMeta(tufMetaPath)
+	subcommands.DieNotNil(err)
+	if bundleTufMeta == nil {
+		subcommands.DieNotNil(errors.New("The bundle metadata has not been found; `bundle-targets.json` is missing in " + tufMetaPath))
+	}
+	bundleMeta := ouBundleTufMeta{}
+	subcommands.DieNotNil(json.Unmarshal(*bundleTufMeta.Signed, &bundleMeta))
+	fmt.Println("Bundle targets info:")
+	fmt.Printf("\tType:\t\t%s\n", bundleMeta.ouBundleMeta.Type)
+	fmt.Printf("\tTag:\t\t%s\n", bundleMeta.Tag)
+	fmt.Printf("\tExpires:\t%s\n", bundleMeta.Expires)
+	fmt.Println("\tTargets:")
+	for _, target := range bundleMeta.Targets {
+		fmt.Printf("\t\t\t%s\n", target)
+	}
+	fmt.Println("\tSignatures:")
+	for _, sig := range bundleTufMeta.Signatures {
+		fmt.Printf("\t\t\t%s\n", sig.KeyID)
+	}
+
+	rootMeta, err := getLatestRoot(tufMetaPath)
+	subcommands.DieNotNil(err)
+	fmt.Println("\tAllowed keys:")
+	for _, key := range rootMeta.Signed.Roles["targets"].KeyIDs {
+		fmt.Printf("\t\t\t%s\n", key)
+	}
+	fmt.Printf("\tThreshold:\t%d\n", rootMeta.Signed.Roles["targets"].Threshold)
+	numberOfMissingSignatures := rootMeta.Signed.Roles["targets"].Threshold - len(bundleTufMeta.Signatures)
+	if numberOfMissingSignatures > 0 {
+		fmt.Printf("\tMissing:\t%d\n", numberOfMissingSignatures)
+	}
+}
+
 func doSignBundle(cmd *cobra.Command, args []string) {
 	offlineKeysFile, _ := cmd.Flags().GetString("keys")
 	offlineKeys, err := keys.GetOfflineCreds(offlineKeysFile)