cherry pick of 15306 (#4484)

go/cmd/mysqlctld/cli/mysqlctld.go

@@ -67,6 +67,7 @@ var (
  --mysql_port=17100 \
  --socket_file=/path/to/socket_file`,
  Args: cobra.NoArgs,
+ Version: servenv.AppVersion.String(),
  PreRunE: servenv.CobraPreRunE,
  RunE: run,
  }

go/cmd/topo2topo/cli/topo2topo.go

@@ -52,6 +52,7 @@ var (
 It can also be used to compare data between two topologies.`,
  Args: cobra.NoArgs,
  PreRunE: servenv.CobraPreRunE,
+ Version: servenv.AppVersion.String(),
  RunE: run,
  }
 )

go/cmd/vtexplain/cli/vtexplain.go

@@ -84,6 +84,7 @@ If no keyspace name is present, VTExplain will return the following error:
  "```\nvtexplain -- -shards 128 --vschema-file vschema.json --schema-file schema.sql --replication-mode \"ROW\" --output-mode text --sql \"INSERT INTO users (user_id, name) VALUES(1, 'john')\"\n```\n",
  Args: cobra.NoArgs,
  PreRunE: servenv.CobraPreRunE,
+ Version: servenv.AppVersion.String(),
  RunE: run,
  }
 )

go/cmd/vttestserver/cli/main.go

@@ -104,6 +104,7 @@ func New() (cmd *cobra.Command) {
  Short: "vttestserver allows users to spawn a self-contained Vitess server for local testing/CI.",
  Args: cobra.NoArgs,
  PreRunE: servenv.CobraPreRunE,
+ Version: servenv.AppVersion.String(),
  RunE: run,
  }
 

go/cmd/zkctld/cli/zkctld.go

@@ -41,6 +41,7 @@ var (
  Use: "zkctld",
  Short: "zkctld is a daemon that starts or initializes ZooKeeper with Vitess-specific configuration. It will stay running as long as the underlying ZooKeeper server, and will pass along SIGTERM.",
  Args: cobra.NoArgs,
+ Version: servenv.AppVersion.String(),
  PersistentPreRunE: servenv.CobraPreRunE,
  PostRun: func(cmd *cobra.Command, args []string) {
  logutil.Flush()

go/flags/endtoend/zkctld.txt

@@ -4,4 +4,5 @@ Usage:
  zkctld [flags]
 
 Flags:
- -h, --help help for zkctld
+ -h, --help help for zkctld
+ -v, --version version for zkctld