Extract duplicate clap helpers into clap-utils (#6812)

archiver/Cargo.toml

@@ -10,6 +10,7 @@ homepage = "https://solana.com/"
 [dependencies]
 clap = "2.33.0"
 console = "0.9.1"
+solana-clap-utils = { path = "../clap-utils", version = "0.21.0" }
 solana-core = { path = "../core", version = "0.21.0" }
 solana-logger = { path = "../logger", version = "0.21.0" }
 solana-metrics = { path = "../metrics", version = "0.21.0" }

archiver/src/main.rs

@@ -1,5 +1,6 @@
 use clap::{crate_description, crate_name, crate_version, App, Arg};
 use console::style;
+use solana_clap_utils::input_validators::is_keypair;
 use solana_core::{
     archiver::Archiver,
     cluster_info::{Node, VALIDATOR_PORT_RANGE},
@@ -11,13 +12,6 @@ use solana_sdk::{
 };
 use std::{net::SocketAddr, path::PathBuf, process::exit, sync::Arc};
 
-// Return an error if a keypair file cannot be parsed.
-fn is_keypair(string: String) -> Result<(), String> {
-    read_keypair_file(&string)
-        .map(|_| ())
-        .map_err(|err| format!("{:?}", err))
-}
-
 fn main() {
     solana_logger::setup();