ARTESCA-9658 fix retry ETCd backoup

scripts/backup.sh.in

@@ -181,7 +181,7 @@ replicate_archives() {
 
 run "Backing up MetalK8s configurations" backup_metalk8s_conf
 run "Backing up CAs certificates and keys" backup_cas
-run_with_retry 12 5 "Backing up etcd data" backup_etcd
+run "Backing up etcd data" with_retry 20 15 backup_etcd # try for 5 minutes (every 15 seconds, 20 times)
 run "Creating backup archive '$BACKUP_ARCHIVE'" create_archive
 
 if (( REPLICATION )); then

scripts/common.sh.in

@@ -218,24 +218,29 @@ run() {
     fi
 }
 
-run_with_retry() {
+with_retry() {
     local retries=$1
     local delay=$2
     shift 2
 
-    local -i i=0
-    while true; do
-        if [[ $(( ++i )) -gt $retries ]]; then
-            die "Failed to run '$*' after ${retries} retries."
-        fi
+    for ((i = 1; i <= retries; i++)); do
+        echo "> Attempt ${i}/${retries}"
 
-        echo -n "> ${i}/${retries} "
-        if run "${@}"; then
-            break
+        local rctemp=$(mktemp)
+        echo $(set +e; "${@}"; echo -n $? > "$rctemp")
+        local rc=$(cat "$rctemp")
+        rm -f "$rctemp"
+
+        if [ $rc -eq 0 ]; then
+            echo "Succeed"
+            return 0
         fi
 
+        echo "Failed"
         sleep "${delay}"
     done
+
+    die "Failed to run '$*' after ${retries} retries."
 }
 
 check_package_manager_yum() {