[multipass] add fallback url to pull from iiab/factory/install.txt

multipass/run_parallel_iiab_test.sh

@@ -149,7 +149,7 @@ fi
 
 # Default module
 if [[ "${#modules[@]}" -eq 0 ]]; then
-  modules=("code")
+  modules=("")
 fi
 
 # If no --pr provided, take from env IIAB_PR (space-separated)
@@ -174,6 +174,7 @@ fi
 
 LOGROOT="${LOGROOT:-iiab_multipass_runs_$(date +%Y%m%d)}"
 mkdir -p "$LOGROOT"
+echo "[INFO] Logging files stored at: $LOGROOT"
 
 stamp() { date +%H%M%S; }
 
@@ -332,7 +333,6 @@ run_install_txt() {
   log="$LOGROOT/${vm}.install.${t}.log"
   rc="$LOGROOT/${vm}.install.${t}.rc"
 
-  echo "[INFO] Logging files stored at: $LOGROOT"
   echo "[INFO] install.txt in $vm (log $(basename "$log")) ..."
 
   local modules_str pr_str
@@ -392,8 +392,22 @@ run_install_txt() {
       fi
 
       echo "--- install.txt ---"
-      echo "curl -fsSL https://iiab.io/install.txt | bash -s -- ${install_args[*]}"
-      curl -fsSL https://iiab.io/install.txt | bash -s -- "${install_args[@]}"
+      INSTALL_PRIMARY="https://iiab.io/install.txt"
+      INSTALL_FALLBACK="https://raw.githubusercontent.com/iiab/iiab-factory/refs/heads/master/install.txt"
+      CURL="curl -fsSL --retry 5 --retry-delay 2 --connect-timeout 15"
+
+      tmp_install="$(mktemp)"
+      if $CURL "$INSTALL_PRIMARY" -o "$tmp_install"; then
+        :
+      else
+        echo "Warning: failed to fetch $INSTALL_PRIMARY"
+        echo "Falling back to $INSTALL_FALLBACK"
+        $CURL "$INSTALL_FALLBACK" -o "$tmp_install"
+      fi
+
+      echo "bash -s -- ${install_args[*]} < \"$tmp_install\""
+      bash -s -- "${install_args[@]}" < "$tmp_install"
+      rm -f "$tmp_install"
 
       echo "--- install done ---"
     ' >"$log" 2>&1
@@ -502,7 +516,12 @@ pipeline_parallel_stagger() {
       sleep $((i * STAGGER))
       launch_one "$vm"
       run_install_txt "$vm"
-      resume_iiab "$vm" 1
+      # Only Ubuntu tends to reboot during install; Debian often doesn't.
+      local waitflag=1
+      if [[ "${VM_IMAGE[$vm]}" == "$DEBIAN13_IMAGE_URL" ]]; then
+        waitflag=0
+      fi
+      resume_iiab "$vm" "$waitflag"
     ) &
     pids+=("$!")
   done