Add DISABLE_LEDGER environment variable (#1430)

Author: sgillespie

doc/docker.md

@@ -150,10 +150,11 @@ for `docker` use `--workdir=`.
 
 Consult the configuration [docs](docs/configuration.md) for what these options mean, assuming you have read that
 they can be accessed via env variables passed to docker-compose. Leave out any that do not make sense, eg if
-you just want to disable the ledger use `EXTRA_DB_SYNC_ARGS=--disable-ledger docker-compose up`.
+you just want to disable the ledger use `DISABLE_LEDGER=Y docker-compose up`.
 
 ``` shell
-EXTRA_DB_SYNC_ARGS="--disable-ledger --disable-cache --disable-epoch" \
+DISABLE_LEDGER=Y \
+EXTRA_DB_SYNC_ARGS="--disable-cache --disable-epoch" \
 docker-compose up
 ```
 

docker-compose.yml

@@ -55,6 +55,7 @@ services:
   cardano-db-sync:
     image: inputoutput/cardano-db-sync:13.1.1.2
     environment:
+      - DISABLE_LEDGER=${DISABLE_LEDGER}
       - NETWORK=${NETWORK:-mainnet}
       - POSTGRES_HOST=postgres
       - POSTGRES_PORT=5432

nix/docker.nix

@@ -136,9 +136,13 @@ let
         set -euo pipefail
         ${scripts.mainnet.db-sync.passthru.service.restoreSnapshotScript}
 
-        exec $DBSYNC \
-          --schema-dir ${../schema} \
-          --state-dir ${scripts.mainnet.db-sync.passthru.service.stateDir} $@
+        if [[ "''${DISABLE_LEDGER:-N}" == "Y" ]]; then
+          LEDGER_OPTS="--disable-ledger"
+        else
+          LEDGER_OPTS="--state-dir ${scripts.mainnet.db-sync.passthru.service.stateDir}"
+        fi
+
+        exec $DBSYNC --schema-dir ${../schema} ''${LEDGER_OPTS} $@
       ${clusterStatements}
       else
         echo "Managed configuration for network "$NETWORK" does not exist"

nix/nixos/cardano-db-sync-service.nix

@@ -186,14 +186,18 @@ in {
               then "--mainnet"
               else "--testnet-magic $(jq '.networkMagic' ${cfg.environment.nodeConfig.ShelleyGenesisFile})");
           dbSyncCommand = ''
+            if [[ "''${DISABLE_LEDGER:-N}" == "Y" ]]; then
+              LEDGER_OPTS="--disable-ledger"
+            else
+              LEDGER_OPTS="--state-dir ${cfg.stateDir}"
+            fi
+
             exec ${exec} \
                 --config ${configFile} \
                 --socket-path "$CARDANO_NODE_SOCKET_PATH" \
                 --schema-dir ${self.schema} \
-                ${if cfg.disableLedger then
-                    "--disable-ledger"
-                  else
-                    "--state-dir ${cfg.stateDir}"}
+                ''${LEDGER_OPTS} \
+                ''${EXTRA_DB_SYNC_ARGS:-}
           '';
     in {
       pgpass = builtins.toFile "pgpass" "${cfg.postgres.socketdir}:${
@@ -216,6 +220,10 @@ in {
           export PGPASSFILE=$(pwd)/pgpass
         ''}
 
+        ${if (cfg.disableLedger) then
+            "export DISABLE_LEDGER=Y"
+          else ""}
+
         ${cfg.restoreSnapshotScript}
 
         if [[ -n "''${WAIT_FOR_NODE_SYNC:-}" ]]