reboot messages

updates.d/99-reboot-check.sh

@@ -2,9 +2,33 @@
 
 source "$HOME/.local/share/coredesktop/utils.sh"
 
+# Packages whose upgrade only fully takes effect after a reboot: the kernel and
+# firmware, the NVIDIA driver (the loaded module must match the installed
+# one), CPU microcode, and the core libraries every running program uses
+REBOOT_PACKAGES='linux|linux-lts|linux-zen|linux-hardened|linux-firmware.*|nvidia.*|.*-ucode|systemd|glibc'
+
 if initramfs_build_failed; then
   echo -e "\e[31mDon't reboot yet: the initramfs failed to rebuild (see $PACMAN_UPDATE_LOG).\e[0m"
+  exit 0
+fi
+
+reasons=()
+
 # If the running kernel's modules are gone, a newer kernel was installed
-elif [ ! -d "/usr/lib/modules/$(uname -r)" ]; then
-  echo "A newer kernel has been installed. Please reboot when convenient."
+if [ ! -d "/usr/lib/modules/$(uname -r)" ]; then
+  reasons+=("a newer kernel was installed")
+fi
+
+# Packages upgraded by this update's pacman -Su (see updates.d/10-pacman.sh)
+if [ -f "$PACMAN_UPDATE_LOG" ]; then
+  mapfile -t upgraded < <(tr '\r' '\n' < "$PACMAN_UPDATE_LOG" \
+    | grep -oP 'upgrading \K[^ ]+' | sort -u | grep -xE "$REBOOT_PACKAGES")
+  if (( ${#upgraded[@]} > 0 )); then
+    reasons+=("${upgraded[*]} upgraded")
+  fi
+fi
+
+if (( ${#reasons[@]} > 0 )); then
+  reason="$(printf '%s; ' "${reasons[@]}")"
+  echo -e "\e[33mPlease reboot when convenient to finish this update (${reason%; }).\e[0m"
 fi