Add random GNOME wallpaper timer via systemd user units

4 files changed, 90 insertions, 0 deletions

diff --git a/Rexfile b/Rexfile
index a9c1c5e..4280419 100644
--- a/Rexfile
+++ b/Rexfile
@@ -376,6 +376,30 @@ task 'home_quickedit', sub {
     }
 };
 
+desc 'Install systemd user units';
+task 'home_systemd_user', sub {
+    my $dst_dir = "$HOME/.config/systemd/user";
+
+    file $dst_dir,
+      ensure => 'directory',
+      mode   => '0700';
+
+    for my $file ( glob "${DOT}/systemd-user/*" ) {
+        file "$dst_dir/" . basename($file),
+          ensure => 'present',
+          source => $file,
+          mode   => '0640';
+    }
+
+    # Reload systemd user daemon to pick up any new or changed units.
+    Rex::Logger::info('Reloading systemd user daemon');
+    run 'systemctl --user daemon-reload';
+
+    # Enable the random-wallpaper timer so it starts on login.
+    Rex::Logger::info('Enabling random-wallpaper.timer');
+    run 'systemctl --user enable random-wallpaper.timer';
+};
+
 desc 'Install all my ~ files';
 task 'home', sub {
     require Rex::TaskList;
diff --git a/scripts/random-wallpaper.sh b/scripts/random-wallpaper.sh
new file mode 100644
index 0000000..03fb160
--- /dev/null
+++ b/scripts/random-wallpaper.sh
@@ -0,0 +1,51 @@
+#!/bin/sh
+# Randomly sets a GNOME desktop wallpaper from image files in a given directory.
+
+WALLPAPER_DIR="$HOME/Pictures/Pixel7ProDCIM/Irregular Ninja/irregular.ninja"
+
+if [ ! -d "$WALLPAPER_DIR" ]; then
+    printf 'Directory not found: %s\n' "$WALLPAPER_DIR" >&2
+    exit 1
+fi
+
+# Pick a random image file (common extensions)
+IMAGE=$(find "$WALLPAPER_DIR" -maxdepth 1 -type f \
+    \( \
+    -iname '*.jpg' -o \
+    -iname '*.jpeg' -o \
+    -iname '*.png' -o \
+    -iname '*.bmp' -o \
+    -iname '*.webp' -o \
+    -iname '*.gif' \
+    \) | sort -R | head -n 1)
+
+if [ -z "$IMAGE" ]; then
+    printf 'No images found in %s\n' "$WALLPAPER_DIR" >&2
+    exit 1
+fi
+
+# GNOME Shell caches wallpaper textures keyed by URI.
+# If the path is always the same, Shell won't reload even when the file
+# contents change. Use a unique filename on every run so the URI changes
+# and Shell is forced to load the new image.
+CLEAN_DIR="$HOME/.local/share/wallpapers"
+UNIQUE="random-wallpaper-$(date +%s)"
+CLEAN_PATH="$CLEAN_DIR/$UNIQUE.jpg"
+
+mkdir -p "$CLEAN_DIR"
+cp "$IMAGE" "$CLEAN_PATH"
+
+# Clean up old copies to avoid filling the directory
+# Keep the last 5 wallpapers around
+ls -1t "$CLEAN_DIR"/random-wallpaper-*.jpg 2> /dev/null | sed -n '6,$p' | xargs -r rm -f
+
+# dconf-service on Fedora 50 has a bug where gsettings set keeps changes in
+# memory but never syncs them to the on-disk database.  GNOME Shell reads
+# directly from disk, so it never sees wallpaper changes made with gsettings.
+# Writing via dconf write bypasses the buggy service and hits the database
+# directly, making GNOME Shell pick up the change immediately.
+dconf write /org/gnome/desktop/background/picture-uri "'file://$CLEAN_PATH'"
+dconf write /org/gnome/desktop/background/picture-uri-dark "'file://$CLEAN_PATH'"
+
+# Show me what was set
+printf 'Set wallpaper to: %s (copied from %s)\n' "$CLEAN_PATH" "$IMAGE"
diff --git a/systemd-user/random-wallpaper.service b/systemd-user/random-wallpaper.service
new file mode 100644
index 0000000..f82af6c
--- /dev/null
+++ b/systemd-user/random-wallpaper.service
@@ -0,0 +1,6 @@
+[Unit]
+Description=Set random GNOME wallpaper from image directory
+
+[Service]
+Type=oneshot
+ExecStart=%h/scripts/random-wallpaper.sh
diff --git a/systemd-user/random-wallpaper.timer b/systemd-user/random-wallpaper.timer
new file mode 100644
index 0000000..d3aef0a
--- /dev/null
+++ b/systemd-user/random-wallpaper.timer
@@ -0,0 +1,9 @@
+[Unit]
+Description=Set random GNOME wallpaper once per hour
+
+[Timer]
+OnCalendar=hourly
+Persistent=true
+
+[Install]
+WantedBy=timers.target