numerous updates

utils.sh

@@ -73,6 +73,40 @@ enable_services() {
   done
 }
 
+# Run each script in migrations/ that hasn't run on this machine yet, oldest
+# first. A migration is recorded as done only when it succeeds, and the first
+# failure stops the run so a later migration never runs ahead of an earlier one.
+run_migrations() {
+  local dir="${COREDESKTOP:-$HOME/.local/share/coredesktop}/migrations"
+  local state="$HOME/.local/state/coredesktop/migrations"
+  local file name
+
+  mkdir -p "$state"
+  for file in "$dir"/*.sh; do
+    [ -f "$file" ] || continue
+    name="$(basename "$file")"
+    [ -f "$state/$name" ] && continue
+
+    echo "Running migration $name..."
+    if ! bash "$file"; then
+      echo "Migration $name failed; it will run again on the next update."
+      return 1
+    fi
+    touch "$state/$name"
+  done
+}
+
+# Output of the last update's pacman -Su, written by updates.d/10-pacman.sh
+PACMAN_UPDATE_LOG="$HOME/.local/state/coredesktop/pacman-update.log"
+
+# True if the last update rebuilt the initramfs and mkinitcpio reported a
+# failure. Rebooting then can leave the machine unbootable.
+initramfs_build_failed() {
+  [ -f "$PACMAN_UPDATE_LOG" ] || return 1
+  grep -q "Updating linux initcpios" "$PACMAN_UPDATE_LOG" || return 1
+  grep -q "==> ERROR" "$PACMAN_UPDATE_LOG" || ! grep -q "Image generation successful" "$PACMAN_UPDATE_LOG"
+}
+
 # Install a script atomically (copy to a temp file, then rename over the target)
 # so a copy of it that is running right now keeps reading the old file
 install_script() {