From 9b9b3ae37a3d9502906bd84cc3a0176bfc4276c8 Mon Sep 17 00:00:00 2001
From: Danny Tuppeny <danny@tuppeny.com>
Date: Fri, 29 Jun 2018 09:43:45 +0100
Subject: [PATCH] Retry npm step 5 times with 5 second pause (#18918)

---
 dev/bots/travis_install.sh | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/dev/bots/travis_install.sh b/dev/bots/travis_install.sh
index bee490c0fe..bbe52f8514 100755
--- a/dev/bots/travis_install.sh
+++ b/dev/bots/travis_install.sh
@@ -1,8 +1,25 @@
 #!/bin/bash
 set -ex
 
+function retry {
+  local total_tries=$1
+  local remaining_tries=$total_tries
+  shift
+  while [ $remaining_tries -gt 0 ]; do
+    "$@" && break
+    remaining_tries=$(($remaining_tries - 1))
+    sleep 5
+  done
+
+  [ $remaining_tries -eq 0 ] && {
+    echo "Command still failed after $total_tries tries: $@"
+    return 1
+  }
+  return 0
+}
+
 if [ -n "$TRAVIS" ] && [ "$TRAVIS_PULL_REQUEST" == "false" ]; then
   gem install coveralls-lcov
   gem install bundler
-  npm install -g firebase-tools@">=3.6.1 <3.7.0"
+  retry 5 npm install -g firebase-tools@">=3.6.1 <3.7.0"
 fi