Build dropbox and dropbox-cli for aarch64

Dropbox publishes its Linux client for x86_64 only, so on AArch64 the
dropbox package installs that same client and runs it under box64. Only
dropboxd changes: it execs the client through box64, and /usr/bin/dropbox
points at it, so the systemd units and `dropbox-cli start` both go through
the emulator. The x86_64 package is unchanged.

dropbox-cli is a Python script and becomes arch=any.

pkgbuilds/dropbox-cli/PKGBUILD

@@ -7,9 +7,9 @@
 
 pkgname=dropbox-cli
 pkgver=2026.09.28
-pkgrel=1
+pkgrel=2
 pkgdesc="Command line interface for Dropbox"
-arch=("x86_64")
+arch=("any")
 url="https://www.dropbox.com"
 license=("GPL-3.0-or-later")
 makedepends=("gdk-pixbuf2")

pkgbuilds/dropbox/PKGBUILD

@@ -7,10 +7,13 @@ pkgname=dropbox
 pkgver=272.4.3798
 pkgrel=1
 pkgdesc="A free service that lets you bring your photos, docs, and videos anywhere and share them easily."
-arch=("x86_64")
+arch=("x86_64" "aarch64")
 url="https://www.dropbox.com"
 license=(custom:Dropbox)
 depends=("libsm" "libxslt" "libxmu" "libxdamage" "libxrender" "libxxf86vm" "libxcomposite" "fontconfig" "dbus")
+# Dropbox ships Linux builds for x86_64 only. AArch64 runs the same client
+# under box64, which maps its glibc and GTK calls onto the native libraries.
+depends_aarch64=("box64")
 makedepends=("gendesk")
 optdepends=(
   'ufw-extras: ufw rules for dropbox'
@@ -43,7 +46,15 @@ package() {
   chmod 755 "$pkgdir"/opt/dropbox/*.so
 
   install -d "$pkgdir"/usr/bin
-  ln -s ../../opt/dropbox/dropbox "$pkgdir"/usr/bin/dropbox
+  if [[ $CARCH == aarch64 ]]; then
+    # `dropbox-cli start` runs dropboxd, so pointing dropboxd at box64 and
+    # /usr/bin/dropbox at dropboxd sends every launch through the emulator.
+    sed -i 's|^exec "$PAR"/dropbox "$@"$|exec /usr/bin/box64 "$PAR"/dropbox "$@"|' "$pkgdir"/opt/dropbox/dropboxd
+    grep -qxF 'exec /usr/bin/box64 "$PAR"/dropbox "$@"' "$pkgdir"/opt/dropbox/dropboxd
+    ln -s ../../opt/dropbox/dropboxd "$pkgdir"/usr/bin/dropbox
+  else
+    ln -s ../../opt/dropbox/dropbox "$pkgdir"/usr/bin/dropbox
+  fi
 
   install -Dm644 "$srcdir"/dropbox.desktop -t "$pkgdir"/usr/share/applications
   install -Dm644 "$srcdir"/DropboxGlyph_Blue.svg "$pkgdir"/usr/share/pixmaps/dropbox.svg