Fix the black screen on first boot and the installer's missing directories

install/steps/config.sh

@@ -1,6 +1,10 @@
 # BLOB_PATH is a symlink to this checkout rather than a copy, so bin/, shell/,
 # themes/ and default/ are always the working tree. Every path the shell
 # resolves as $BLOB_PATH/... therefore needs no install step at all.
+#
+# ~/.local/share does not exist on a fresh Arch install, and ln does not create
+# the parent of its link, so make it here rather than relying on another step
+# having run first.
 link_blob_path() {
   local current=""
   [[ -L $blob_path ]] && current="$(readlink -f "$blob_path")"
@@ -22,6 +26,7 @@ link_blob_path() {
     return 0
   fi
 
+  mkdir -p "$(dirname "$blob_path")"
   ln -sfn "$repo_dir" "$blob_path"
   say "link  BLOB_PATH -> $repo_dir"
 }

install/steps/directories.sh

@@ -17,7 +17,7 @@ directories=(
   "$HOME/.local/share/fonts"
   "$HOME/.local/share/applications"
   "$HOME/.local/share/icons/hicolor/256x256/apps"
-  "$HOME/wallpapers"
+  "$HOME/.cache/blob"
 )
 
 create_directories() {

install/steps/login.sh

@@ -1,7 +1,7 @@
 session_entry_dir=/usr/local/share/wayland-sessions
 session_entry_search_dirs=(/usr/local/share/wayland-sessions /usr/share/wayland-sessions)
 greeter_config_dir=/etc/sddm.conf.d
-greeter_compositor_config=/etc/sddm/hyprland-greeter.conf
+greeter_compositor_config=/etc/sddm/hyprland-greeter.lua
 
 # SDDM reads /etc/sddm.conf.d in alphabetical order and the last file wins, so
 # Blob's drop-ins are named to sort after anything a distribution, an installer
@@ -10,10 +10,12 @@ blob_greeter_conf="$greeter_config_dir/zz-blob.conf"
 blob_autologin_conf="$greeter_config_dir/zzz-blob-autologin.conf"
 
 # SDDM's stock Wayland greeter runs on weston, which Blob does not install.
-# Point it at Hyprland with a greeter-only config instead.
+# Point it at Hyprland with a greeter-only config instead. That config is Lua:
+# Hyprland dropped the old hyprlang format, and a config it cannot parse leaves
+# the greeter with no compositor and the screen black.
 install_login_config() {
-  install_root_file "$repo_dir/default/sddm/hyprland-greeter.conf" \
-    "$greeter_compositor_config" "sddm/hyprland-greeter.conf"
+  install_root_file "$repo_dir/default/sddm/hyprland-greeter.lua" \
+    "$greeter_compositor_config" "sddm/hyprland-greeter.lua"
   install_root_file "$repo_dir/default/sddm/zz-blob.conf" \
     "$blob_greeter_conf" "sddm.conf.d/zz-blob.conf"
 }

install/steps/theme.sh

@@ -0,0 +1,92 @@
+default_theme=flats
+wallpaper_dir="$HOME/wallpapers"
+current_state_dir="$HOME/.local/state/blob/current"
+
+# ~/wallpapers is what the wallpaper picker and `blob wallpaper set` read, and
+# the checkout already carries the collection. Link it for the same reason
+# BLOB_PATH is a link: one copy, and edits in the checkout are live.
+link_wallpapers() {
+  local source="$repo_dir/wallpapers"
+  local current=""
+
+  [[ -L $wallpaper_dir ]] && current="$(readlink -f "$wallpaper_dir")"
+
+  if [[ $current == "$source" ]]; then
+    say "ok    wallpapers"
+    return 0
+  fi
+
+  if [[ -d $wallpaper_dir && ! -L $wallpaper_dir ]] && [[ -n "$(ls -A "$wallpaper_dir")" ]]; then
+    say "ok    wallpapers (own directory kept)"
+    return 0
+  fi
+
+  note_change
+  if [[ $check == true ]]; then
+    say "would link $wallpaper_dir -> $source"
+    return 0
+  fi
+
+  [[ -d $wallpaper_dir && ! -L $wallpaper_dir ]] && rmdir "$wallpaper_dir"
+  ln -sfn "$source" "$wallpaper_dir"
+  say "link  wallpapers -> $source"
+}
+
+# Without a theme there is no palette, no themed app config, and no background
+# for the shell to draw, so the first login lands on a black screen that looks
+# like a failed session. Applied headless: no shell and no session bus exist
+# while the installer runs.
+install_default_theme() {
+  if [[ -s $current_state_dir/theme.name ]]; then
+    say "ok    theme ($(cat "$current_state_dir/theme.name"))"
+    return 0
+  fi
+
+  note_change
+  if [[ $check == true ]]; then
+    say "would apply the $default_theme theme"
+    return 0
+  fi
+
+  if BLOB_PATH="$blob_path" BLOB_THEME_HEADLESS=1 PATH="$repo_dir/bin:$PATH" \
+    blob-theme-set "$default_theme" >/dev/null; then
+    say "theme $default_theme"
+  else
+    say "WARN  could not apply the $default_theme theme"
+  fi
+}
+
+# Only a theme that ships its own backgrounds/ sets this link, and most ship
+# none: they are meant to leave the current wallpaper alone. On a first install
+# there is no current wallpaper, so pick one.
+install_default_background() {
+  local link="$current_state_dir/background"
+  local search="$wallpaper_dir"
+  local first
+
+  if [[ -e $link ]]; then
+    say "ok    background"
+    return 0
+  fi
+
+  # --check writes nothing, so the wallpaper link is not there yet to look in.
+  [[ -d $search ]] || search="$repo_dir/wallpapers"
+
+  first="$(find -L "$search" -maxdepth 1 -type f \
+    \( -iname '*.jpg' -o -iname '*.jpeg' -o -iname '*.png' -o -iname '*.webp' \) \
+    2>/dev/null | sort | head -1)"
+
+  if [[ -z $first ]]; then
+    say "SKIP  background (no image in $search)"
+    return 0
+  fi
+
+  note_change
+  if [[ $check == true ]]; then
+    say "would set the background to $(basename "$first")"
+    return 0
+  fi
+
+  ln -nsf "$first" "$link"
+  say "bg    $(basename "$first")"
+}