Structure the installers explicitly with clearly defined segments

install/config/plymouth.sh

@@ -0,0 +1,121 @@
+#!/bin/bash
+
+if ! command -v plymouth &>/dev/null; then
+  yay -S --noconfirm --needed plymouth
+
+  # Skip if plymouth already exists for some reason
+  # Backup original mkinitcpio.conf just in case
+  backup_timestamp=$(date +"%Y%m%d%H%M%S")
+  sudo cp /etc/mkinitcpio.conf "/etc/mkinitcpio.conf.bak.${backup_timestamp}"
+
+  # Add plymouth to HOOKS array after 'base udev' or 'base systemd'
+  if grep "^HOOKS=" /etc/mkinitcpio.conf | grep -q "base systemd"; then
+    sudo sed -i '/^HOOKS=/s/base systemd/base systemd plymouth/' /etc/mkinitcpio.conf
+  elif grep "^HOOKS=" /etc/mkinitcpio.conf | grep -q "base udev"; then
+    sudo sed -i '/^HOOKS=/s/base udev/base udev plymouth/' /etc/mkinitcpio.conf
+  else
+    echo "Couldn't add the Plymouth hook"
+  fi
+
+  # Regenerate initramfs
+  sudo mkinitcpio -P
+
+  # Add kernel parameters for Plymouth (systemd-boot only)
+  if [ -d "/boot/loader/entries" ]; then
+    echo "Detected systemd-boot"
+
+    for entry in /boot/loader/entries/*.conf; do
+      if [ -f "$entry" ]; then
+        # Skip fallback entries
+        if [[ "$(basename "$entry")" == *"fallback"* ]]; then
+          echo "Skipped: $(basename "$entry") (fallback entry)"
+          continue
+        fi
+
+        # Skip if splash it already present for some reason
+        if ! grep -q "splash" "$entry"; then
+          sudo sed -i '/^options/ s/$/ splash quiet/' "$entry"
+        else
+          echo "Skipped: $(basename "$entry") (splash already present)"
+        fi
+      fi
+    done
+  elif [ -f "/etc/default/grub" ]; then
+    echo "Detected grub"
+    # Backup GRUB config before modifying
+    backup_timestamp=$(date +"%Y%m%d%H%M%S")
+    sudo cp /etc/default/grub "/etc/default/grub.bak.${backup_timestamp}"
+
+    # Check if splash is already in GRUB_CMDLINE_LINUX_DEFAULT
+    if ! grep -q "GRUB_CMDLINE_LINUX_DEFAULT.*splash" /etc/default/grub; then
+      # Get current GRUB_CMDLINE_LINUX_DEFAULT value
+      current_cmdline=$(grep "^GRUB_CMDLINE_LINUX_DEFAULT=" /etc/default/grub | cut -d'"' -f2)
+
+      # Add splash and quiet if not present
+      new_cmdline="$current_cmdline"
+      if [[ ! "$current_cmdline" =~ splash ]]; then
+        new_cmdline="$new_cmdline splash"
+      fi
+      if [[ ! "$current_cmdline" =~ quiet ]]; then
+        new_cmdline="$new_cmdline quiet"
+      fi
+
+      # Trim any leading/trailing spaces
+      new_cmdline=$(echo "$new_cmdline" | xargs)
+
+      sudo sed -i "s/^GRUB_CMDLINE_LINUX_DEFAULT=\".*\"/GRUB_CMDLINE_LINUX_DEFAULT=\"$new_cmdline\"/" /etc/default/grub
+
+      # Regenerate grub config
+      sudo grub-mkconfig -o /boot/grub/grub.cfg
+    else
+      echo "GRUB already configured with splash kernel parameters"
+    fi
+  elif [ -d "/etc/cmdline.d" ]; then
+    echo "Detected a UKI setup"
+    # Relying on mkinitcpio to assemble a UKI
+    # https://wiki.archlinux.org/title/Unified_kernel_image
+    if ! grep -q splash /etc/cmdline.d/*.conf; then
+      # Need splash, create the omarchy file
+      echo "splash" | sudo tee -a /etc/cmdline.d/omarchy.conf
+    fi
+    if ! grep -q quiet /etc/cmdline.d/*.conf; then
+      # Need quiet, create or append the omarchy file
+      echo "quiet" | sudo tee -a /etc/cmdline.d/omarchy.conf
+    fi
+  elif [ -f "/etc/kernel/cmdline" ]; then
+    # Alternate UKI kernel cmdline location
+    echo "Detected a UKI setup"
+
+    # Backup kernel cmdline config before modifying
+    backup_timestamp=$(date +"%Y%m%d%H%M%S")
+    sudo cp /etc/kernel/cmdline "/etc/kernel/cmdline.bak.${backup_timestamp}"
+
+    current_cmdline=$(cat /etc/kernel/cmdline)
+
+    # Add splash and quiet if not present
+    new_cmdline="$current_cmdline"
+    if [[ ! "$current_cmdline" =~ splash ]]; then
+      new_cmdline="$new_cmdline splash"
+    fi
+    if [[ ! "$current_cmdline" =~ quiet ]]; then
+      new_cmdline="$new_cmdline quiet"
+    fi
+
+    # Trim any leading/trailing spaces
+    new_cmdline=$(echo "$new_cmdline" | xargs)
+
+    # Write new file
+    echo $new_cmdline | sudo tee /etc/kernel/cmdline
+  else
+    echo ""
+    echo "Neither systemd-boot nor GRUB detected. Please manually add these kernel parameters:"
+    echo "  - splash (to see the graphical splash screen)"
+    echo "  - quiet (for silent boot)"
+    echo ""
+  fi
+
+  # Copy and set the Plymouth theme
+  sudo cp -r "$HOME/.local/share/omarchy/default/plymouth" /usr/share/plymouth/themes/omarchy/
+
+  sudo plymouth-set-default-theme -R omarchy
+fi