Initial commit

hosts/machine/kanade/modules/mac/avatar.nix

@@ -0,0 +1,34 @@
+{
+  pkgs,
+  inputs,
+  ...
+}:
+let
+  avatar = pkgs.runCommand "kanade-avatar.jpg" { nativeBuildInputs = [ pkgs.imagemagick ]; } ''
+    magick "${inputs.self}/assets/avatar.webp" -quality 92 "$out"
+  '';
+in
+{
+  system.activationScripts.postActivation.text = ''
+    avatarPath="/Library/User Pictures/imnyang.jpg"
+    importFile="$(/usr/bin/mktemp /tmp/imnyang-avatar.XXXXXX)"
+
+    /usr/bin/install -d -m 0755 "/Library/User Pictures"
+    /usr/bin/install -m 0644 "${avatar}" "$avatarPath"
+
+    # Replace both account-picture representations. JPEGPhoto is embedded in
+    # the directory record and is used by the login screen and System Settings.
+    /usr/bin/dscl . -delete /Users/imnyang JPEGPhoto >/dev/null 2>&1 || true
+    /usr/bin/dscl . -delete /Users/imnyang Picture >/dev/null 2>&1 || true
+    /usr/bin/dscl . -create /Users/imnyang Picture "$avatarPath"
+
+    /usr/bin/printf '%s\n%s:%s' \
+      '0x0A 0x5C 0x3A 0x2C dsRecTypeStandard:Users 2 dsAttrTypeStandard:RecordName externalbinary:dsAttrTypeStandard:JPEGPhoto' \
+      'imnyang' \
+      "$avatarPath" > "$importFile"
+    /usr/bin/dsimport "$importFile" /Local/Default M
+    /bin/rm -f "$importFile"
+
+    /usr/bin/dscacheutil -flushcache
+  '';
+}