ledger-tool: Make verify --print-bank-hash support json (#1745)

The bank-hash command in ledger-tool was recently deprecated. However,
the command is used by some of the scripts that coordinate starting up
a fresh cluster. So, the deprecation of bank-hash broke those scripts.

This change fixes the scripts by doing the following:
- Makes --print-bank-hash support --output json
- Updates scripts to install jq on provisioned nodes
- Update remote-node.sh to parse the bank hash from json using jq

ledger-tool/src/main.rs

@@ -8,6 +8,7 @@ use {
         ledger_utils::*,
         output::{
             output_account, AccountsOutputConfig, AccountsOutputMode, AccountsOutputStreamer,
+            SlotBankHash,
         },
         program::*,
     },
@@ -1610,9 +1611,12 @@ fn main() {
 
                     process_options.slot_callback = slot_callback;
 
+                    let output_format =
+                        OutputFormat::from_matches(arg_matches, "output_format", false);
                     let print_accounts_stats = arg_matches.is_present("print_accounts_stats");
                     let print_bank_hash = arg_matches.is_present("print_bank_hash");
                     let write_bank_file = arg_matches.is_present("write_bank_file");
+
                     let genesis_config = open_genesis_config_by(&ledger_path, arg_matches);
                     info!("genesis hash: {}", genesis_config.hash());
 
@@ -1635,11 +1639,11 @@ fn main() {
                         working_bank.print_accounts_stats();
                     }
                     if print_bank_hash {
-                        println!(
-                            "Bank hash for slot {}: {}",
-                            working_bank.slot(),
-                            working_bank.hash()
-                        );
+                        let slot_bank_hash = SlotBankHash {
+                            slot: working_bank.slot(),
+                            hash: working_bank.hash().to_string(),
+                        };
+                        println!("{}", output_format.formatted_string(&slot_bank_hash));
                     }
                     if write_bank_file {
                         bank_hash_details::write_bank_hash_details_file(&working_bank)

ledger-tool/src/output.rs

@@ -101,6 +101,22 @@ impl Display for SlotBounds<'_> {
     }
 }
 
+#[derive(Serialize, Debug, Default)]
+#[serde(rename_all = "camelCase")]
+pub struct SlotBankHash {
+    pub slot: Slot,
+    pub hash: String,
+}
+
+impl VerboseDisplay for SlotBankHash {}
+impl QuietDisplay for SlotBankHash {}
+
+impl Display for SlotBankHash {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        writeln!(f, "Bank hash for slot {}: {}", self.slot, self.hash)
+    }
+}
+
 fn writeln_entry(f: &mut dyn fmt::Write, i: usize, entry: &CliEntry, prefix: &str) -> fmt::Result {
     writeln!(
         f,

net/gce.sh

@@ -805,6 +805,7 @@ $(
     install-certbot.sh \
     install-earlyoom.sh \
     install-iftop.sh \
+    install-jq.sh \
     install-libssl-compatability.sh \
     install-rsync.sh \
     install-perf.sh \

net/remote/remote-node.sh

@@ -263,7 +263,7 @@ EOF
       agave-ledger-tool -l config/bootstrap-validator shred-version --max-genesis-archive-unpacked-size 1073741824 | tee config/shred-version
 
       if [[ -n "$maybeWaitForSupermajority" ]]; then
-        bankHash=$(agave-ledger-tool -l config/bootstrap-validator bank-hash --halt-at-slot 0)
+        bankHash=$(agave-ledger-tool -l config/bootstrap-validator verify --halt-at-slot 0 --print-bank-hash --output json | jq -r ".hash")
         shredVersion="$(cat "$SOLANA_CONFIG_DIR"/shred-version)"
         extraNodeArgs="$extraNodeArgs --expected-bank-hash $bankHash --expected-shred-version $shredVersion"
         echo "$bankHash" > config/bank-hash

net/scripts/install-jq.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+#
+# jq setup
+#
+set -ex
+
+[[ $(uname) = Linux ]] || exit 1
+[[ $USER = root ]] || exit 1
+
+apt-get --assume-yes install jq