try to add exponential retry to the apt-get

Author: Picazsoo

CI/circle_parallel.sh

@@ -7,12 +7,34 @@ NODE_INDEX=${CIRCLE_NODE_INDEX:-0}
 
 set -e
 
+# Retry a command up to $1 times, with exponential backoff starting at $2 seconds.
+retry() {
+  local attempts=$1; shift
+  local delay=$1;    shift
+  local count=0
+  until "$@"; do
+    count=$((count + 1))
+    if [ "$count" -ge "$attempts" ]; then
+      echo "Command failed after $attempts attempts: $*" >&2
+      return 1
+    fi
+    echo "Attempt $count failed. Retrying in ${delay}s..." >&2
+    sleep "$delay"
+    delay=$((delay * 2))
+  done
+}
+
+# Wrapper for apt-get install with automatic retry on transient network errors.
+apt_install() {
+  retry 3 30 sudo apt-get -y install --fix-missing "$@"
+}
+
 export NODE_ENV=test
 
 if [ "$NODE_INDEX" = "1" ]; then
   echo "Running node $NODE_INDEX ..."
 
-  sudo apt-get -y install cpanminus
+  apt_install cpanminus
 
   echo "Testing perl"
   (cd samples/client/petstore/perl && /bin/bash ./test.bash)
@@ -22,7 +44,7 @@ elif [ "$NODE_INDEX" = "2" ]; then
   echo "Running node $NODE_INDEX to test cpp-restsdk"
 
   # install cpprestsdk
-  sudo apt-get install libcpprest-dev
+  apt_install libcpprest-dev
   wget "https://github.com/aminya/setup-cpp/releases/download/v0.37.0/setup-cpp-x64-linux"
   chmod +x ./setup-cpp-x64-linux
   sudo ./setup-cpp-x64-linux --compiler llvm --cmake true --ninja true