feat(accent): hand the login avatar to the SDDM theme

The greeter drew the AccountsService icon while hyprlock and the rofi
powermenu draw ~/.user-icon.jpg, so one login showed two pictures.
udt-accent now writes that path as `avatar`, plus `avatarUser` naming
who it belongs to, into the generated theme.conf.user. Both stay empty
when the file is missing so the greeter keeps its fallback.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 20 insertions, 2 deletions

diff --git a/bin/udt-accent b/bin/udt-accent
index c0b6529..e366bb1 100755
--- a/bin/udt-accent
+++ b/bin/udt-accent
@@ -14,6 +14,7 @@ running `wal -i`, because `wal -i` rewrites the whole ~/.cache/wal directory
 including the terminal's ANSI colors. See the design spec for why that matters.
 """
 
+import getpass
 import json
 import math
 import os
@@ -78,6 +79,11 @@ POWER_ICONS = {
     "hibernateIcon": ["system-hibernate", "system-suspend-hibernate"],
 }
 
+# The login avatar hyprlock and the rofi powermenu draw, handed to the greeter
+# so the login screen shows the same file instead of the AccountsService icon.
+# The sddm user reaches it through the 0711 home, so it has to stay 0644.
+AVATAR = Path.home() / ".user-icon.jpg"
+
 
 def write_atomic(path, content, mode=None, dir_mode=None):
     """Write a file atomically, so no reader ever sees it half-written.
@@ -408,7 +414,7 @@ def power_icons():
     return {key: find_icon(theme, names) for key, names in POWER_ICONS.items()}
 
 
-def sddm_conf(palette, name, image, icons=None):
+def sddm_conf(palette, name, image, icons=None, avatar=""):
     """The SDDM theme config, as an INI fragment.
 
     theme.conf.user overrides theme.conf and is exposed to the theme as the
@@ -425,6 +431,10 @@ def sddm_conf(palette, name, image, icons=None):
     lines += [f"{key}={palette.get(key, '#000000')}" for key in SDDM_KEYS]
     icons = icons or {}
     lines += [f"{key}={icons.get(key, '')}" for key in POWER_ICONS]
+    # The avatar belongs to whoever ran udt-accent; the greeter only uses it
+    # when that username is the one being logged in.
+    lines += [f"avatarUser={getpass.getuser() if avatar else ''}",
+              f"avatar={avatar}"]
     return "\n".join(lines) + "\n"
 
 
@@ -440,7 +450,8 @@ def write_sddm(name, image):
         print("udt-accent: palette.rasi unreadable, skipping SDDM theme",
               file=sys.stderr)
         return
-    write_atomic(SDDM_OUTPUT, sddm_conf(palette, name, image, power_icons()),
+    write_atomic(SDDM_OUTPUT, sddm_conf(palette, name, image, power_icons(),
+                           str(AVATAR) if AVATAR.is_file() else ""),
                  mode=0o644, dir_mode=0o755)
 
 
@@ -626,6 +637,13 @@ def selftest():
             assert f"\n{key}=" in "\n" + text, f"sddm conf missing {key}"
         assert "\npowerIcon=/tmp/power.svg" in "\n" + text
 
+        # No avatar leaves both keys empty so the greeter falls back to
+        # AccountsService; a set one names the user it belongs to.
+        assert "\navatar=\n" in "\n" + text and "\navatarUser=\n" in "\n" + text
+        text = sddm_conf(palette, FALLBACK, str(probe_image), icons, "/tmp/me.jpg")
+        assert "\navatar=/tmp/me.jpg\n" in "\n" + text
+        assert f"\navatarUser={getpass.getuser()}\n" in "\n" + text
+
     got = power_icons()
     assert set(got) == {"powerIcon", "rebootIcon", "suspendIcon", "hibernateIcon"}