From 21a1f7eeb770cdd1eb026dfda8d5d682f861cb6a Mon Sep 17 00:00:00 2001
From: Etan Kissling <etan@status.im>
Date: Tue, 14 Jun 2022 10:38:39 +0200
Subject: [PATCH] error handling for local testnet REST query (#3739)

When querying `ALTAIR_FORK_EPOCH` fails, the `launch_local_testnet`
script got stuck because comparing `CURRENT_FORK_EPOCH` against it
would keep failing with `[: : integer expression expected`.
Querying `ALTAIR_FORK_EPOCH` is now retried until a number is returned.
---
 scripts/launch_local_testnet.sh | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/scripts/launch_local_testnet.sh b/scripts/launch_local_testnet.sh
index 6fee993c9..d6dda1b4f 100755
--- a/scripts/launch_local_testnet.sh
+++ b/scripts/launch_local_testnet.sh
@@ -727,9 +727,16 @@ done
 # light clients
 if [ "$LC_NODES" -ge "1" ]; then
   echo "Waiting for Altair finalization"
-  ALTAIR_FORK_EPOCH="$(
-    "${CURL_BINARY}" -s "http://localhost:${BASE_REST_PORT}/eth/v1/config/spec" | \
-      "${JQ_BINARY}" -r '.data.ALTAIR_FORK_EPOCH')"
+  while :; do
+    ALTAIR_FORK_EPOCH="$(
+      "${CURL_BINARY}" -s "http://localhost:${BASE_REST_PORT}/eth/v1/config/spec" | \
+        "${JQ_BINARY}" -r '.data.ALTAIR_FORK_EPOCH')"
+    if [ "${ALTAIR_FORK_EPOCH}" -eq "${ALTAIR_FORK_EPOCH}" ]; then # check for number
+      break
+    fi
+    echo "ALTAIR_FORK_EPOCH: ${ALTAIR_FORK_EPOCH}"
+    sleep 1
+  done
   while :; do
     CURRENT_FORK_EPOCH="$(
       "${CURL_BINARY}" -s "http://localhost:${BASE_REST_PORT}/eth/v1/beacon/states/finalized/fork" | \