Set the boot splash to blob_boot.png during install

install/steps/boot.sh

@@ -0,0 +1,37 @@
+boot_splash_image="$repo_dir/branding/blob_boot.png"
+boot_splash_theme_dir="/usr/share/plymouth/themes/blob"
+
+boot_splash_installed() {
+  command -v plymouth-set-default-theme &>/dev/null || return 1
+  [[ -f $boot_splash_theme_dir/blob.plymouth ]] || return 1
+  [[ "$(plymouth-set-default-theme 2>/dev/null)" == blob ]]
+}
+
+install_boot_splash() {
+  if ! command -v plymouth-set-default-theme &>/dev/null; then
+    say "SKIP  boot splash (plymouth not installed)"
+    return 0
+  fi
+
+  if [[ ! -f $boot_splash_image ]]; then
+    say "SKIP  boot splash (branding/blob_boot.png missing)"
+    return 0
+  fi
+
+  if boot_splash_installed && cmp -s "$boot_splash_image" "$boot_splash_theme_dir/logo.png"; then
+    say "ok    boot splash"
+    return 0
+  fi
+
+  note_change
+  if [[ $check == true ]]; then
+    say "would set the boot splash to branding/blob_boot.png and rebuild the initramfs"
+    return 0
+  fi
+
+  if BLOB_PATH="$blob_path" "$repo_dir/bin/blob-boot" "$boot_splash_image"; then
+    say "set   boot splash to branding/blob_boot.png"
+  else
+    say "WARN  could not set the boot splash; run 'blob boot' to retry"
+  fi
+}