fix(install): retry the bulk package-cache refresh

A single slow mirror (fastly, <1 byte/sec on one signature file) halted a full install at the -Syu step, which had no retry while every per-package install gets three attempts. The refresh now shares MAX_INSTALL_RETRIES; pacman resumes partial downloads, so a transient stall recovers.

1 files changed, 14 insertions, 1 deletions

diff --git a/archsetup b/archsetup
index 13ee7a0..3f4821f 100755
--- a/archsetup
+++ b/archsetup
@@ -851,8 +851,21 @@ prerequisites() {
     (pacman-key --populate archlinux >> "$logfile" 2>&1) || \
         error_fatal "verifying Arch Linux keys" "$?"
 
+    # The bulk refresh gets the same retry budget as per-package installs —
+    # a single slow mirror ("Operation too slow") halted a full install at
+    # this step on 2026-06-11. pacman picks up where it left off on retry,
+    # so transient mirror stalls recover instead of killing the run.
     action="refreshing the package cache" && display "task" "$action"
-    (pacman -Syu --noconfirm >> "$logfile" 2>&1)  || error_fatal "$action" "$?"
+    refresh_ok=false
+    for attempt in $(seq 1 "$MAX_INSTALL_RETRIES"); do
+        if pacman -Syu --noconfirm >> "$logfile" 2>&1; then
+            refresh_ok=true
+            break
+        fi
+        [ "$attempt" -lt "$MAX_INSTALL_RETRIES" ] && \
+            display "task" "retrying package cache refresh (attempt $((attempt + 1))/$MAX_INSTALL_RETRIES)"
+    done
+    $refresh_ok || error_fatal "$action" "$?"
 
     display "subtitle" "Required Software"