Build cursor-bin for aarch64 with the vendor AppImage

pkgbuilds/cursor-bin/PKGBUILD

@@ -2,24 +2,28 @@
 
 pkgname=cursor-bin
 pkgver=3.20.21
-pkgrel=2
+pkgrel=3
 pkgdesc='AI-first coding environment'
-arch=('x86_64')
+arch=('x86_64' 'aarch64')
 url="https://www.cursor.com"
 license=('LicenseRef-Cursor_EULA')
 # upstream uses Electron newer than internal VSCode
 _electron=electron42
-depends=(xdg-utils ripgrep $_electron nodejs
-  'gcc-libs' 'hicolor-icon-theme' 'libxkbfile')
+depends=('hicolor-icon-theme')
+depends_x86_64=(xdg-utils ripgrep $_electron nodejs gcc-libs libxkbfile)
+depends_aarch64=(fuse2)
+makedepends_aarch64=(squashfs-tools)
 options=(!strip !debug) # Don't break ext of VSCode
 _commit=f09fca384ceca23f7bf21f9c23655b162641d747
-source=("https://downloads.cursor.com/production/${_commit}/linux/x64/deb/amd64/deb/cursor_${pkgver}_amd64.deb"
+source_x86_64=("https://downloads.cursor.com/production/${_commit}/linux/x64/deb/amd64/deb/cursor_${pkgver}_amd64.deb"
 "https://gitlab.archlinux.org/archlinux/packaging/packages/code/-/raw/main/code."{sh,mjs}
 rg.sh)
-sha512sums=('8329138d207309d16410f1cb58da18eea1a034a35f2bdd022ef9b373bb8f1b3d80e489e65256b7283c40e10da77962d158bfa3a64e742337a942633810d80dbe' '937299c6cb6be2f8d25f7dbc95cf77423875c5f8353b8bd6cd7cc8e5603cbf8405b14dbf8bd615db2e3b36ed680fc8e1909410815f7f8587b7267a699e00ab37' '793f9ff6306e3992ac89802d98110cba288ea1181a901467333293b7d76182ef9792c2a39ff49d9347a18a174b1f42bc58862091dff583f4146c2704eea28033' 'e79fe7659f59d1ae02fc68816399bfd31587315df6cdb6ccf1d0ca76f7cdc692c2a42b30591c0091147bd97ef14b1c7745dc26bd7cb3ea6bba45698e5044fa2a')
-noextract=(cursor_${pkgver}_amd64.deb) # avoid double tarball
+sha512sums_x86_64=('8329138d207309d16410f1cb58da18eea1a034a35f2bdd022ef9b373bb8f1b3d80e489e65256b7283c40e10da77962d158bfa3a64e742337a942633810d80dbe' '937299c6cb6be2f8d25f7dbc95cf77423875c5f8353b8bd6cd7cc8e5603cbf8405b14dbf8bd615db2e3b36ed680fc8e1909410815f7f8587b7267a699e00ab37' '793f9ff6306e3992ac89802d98110cba288ea1181a901467333293b7d76182ef9792c2a39ff49d9347a18a174b1f42bc58862091dff583f4146c2704eea28033' 'e79fe7659f59d1ae02fc68816399bfd31587315df6cdb6ccf1d0ca76f7cdc692c2a42b30591c0091147bd97ef14b1c7745dc26bd7cb3ea6bba45698e5044fa2a')
+noextract=(cursor_${pkgver}_amd64.deb "Cursor-${pkgver}-aarch64.AppImage") # avoid double tarball
+source_aarch64=("Cursor-${pkgver}-aarch64.AppImage::https://downloads.cursor.com/production/${_commit}/linux/arm64/Cursor-${pkgver}-aarch64.AppImage")
+sha512sums_aarch64=('7612459f1d9338ba4c2df8e223412901d6c8785f0439e80ae771fe5037f39ac7016a2004589d1049f8f2d254ae06236942193d99558b49960309113e7faeb72e')
 _app=usr/share/cursor/resources/app
-package() {
+_package_x86_64() {
   # Exclude electron
   bsdtar -xOf ${noextract[0]} data.tar.xz | tar -xJf - -C "$pkgdir" \
     --exclude 'usr/share/cursor/[^r]*' --exclude 'usr/share/cursor/*.pak'
@@ -36,3 +40,70 @@ package() {
   install -d "$pkgdir"/usr/bin
   ln -sf /usr/share/cursor/cursor "$pkgdir"/usr/bin/cursor
 }
+
+# ARM keeps the vendor Electron runtime; x86_64 retains system Electron.
+prepare() {
+  [[ "$CARCH" == aarch64 ]] || return 0
+  local img="${srcdir}/Cursor-${pkgver}-aarch64.AppImage"
+  local offset
+  offset="$(LC_ALL=C grep -aobm1 $'hsqs' "$img" | cut -d: -f1)"
+  [[ -n "$offset" ]] || { echo "no squashfs (hsqs) magic in $img" >&2; return 1; }
+  # -no-xattrs: the squashfs carries security.selinux, and unsquashfs exits 2
+  # when the builder user cannot write them. Extract only the desktop/icon
+  # trees; the AppImage itself is the runtime payload.
+  unsquashfs -no-xattrs -f -o "$offset" -d "${srcdir}/squashfs-root" "$img" \
+    usr/share/applications usr/share/icons usr/share/pixmaps
+}
+
+_rewrite_desktop() {
+  local src="$1" dest="$2"
+  # Embedded Exec lines are /usr/share/cursor/cursor plus arguments (%F,
+  # --new-window %F, --open-url %U). Rewrite only the binary path.
+  sed -E \
+    -e 's|^Exec=/usr/share/cursor/cursor|Exec=/usr/bin/cursor|' \
+    -e 's|^TryExec=.*|TryExec=/usr/bin/cursor|' \
+    "$src" | install -Dm644 /dev/stdin "$dest"
+}
+
+_package_aarch64() {
+  install -Dm755 "${srcdir}/Cursor-${pkgver}-aarch64.AppImage" \
+    "${pkgdir}/opt/cursor-bin/cursor.AppImage"
+
+  install -Dm755 /dev/stdin "${pkgdir}/usr/bin/cursor" <<'EOF'
+#!/bin/bash
+exec /opt/cursor-bin/cursor.AppImage "$@"
+EOF
+
+  local root="${srcdir}/squashfs-root"
+  _rewrite_desktop \
+    "$root/usr/share/applications/cursor.desktop" \
+    "${pkgdir}/usr/share/applications/cursor.desktop"
+  _rewrite_desktop \
+    "$root/usr/share/applications/cursor-url-handler.desktop" \
+    "${pkgdir}/usr/share/applications/cursor-url-handler.desktop"
+
+  local icon_src icon_dest
+  while IFS= read -r -d '' icon_src; do
+    icon_dest="${icon_src#"$root"}"
+    # Desktop files say Icon=co.anysphere.cursor; the hicolor set in the
+    # squashfs is named cursor.png. Install under the name the entries use.
+    if [[ "$(basename "$icon_dest")" == cursor.png ]]; then
+      icon_dest="$(dirname "$icon_dest")/co.anysphere.cursor.png"
+    elif [[ "$(basename "$icon_dest")" == cursor.svg ]]; then
+      icon_dest="$(dirname "$icon_dest")/co.anysphere.cursor.svg"
+    fi
+    install -Dm644 "$icon_src" "${pkgdir}${icon_dest}"
+  done < <(find "$root/usr/share/icons" -type f \( -name '*.png' -o -name '*.svg' \) -print0 2>/dev/null)
+
+  if [[ -f "$root/usr/share/pixmaps/co.anysphere.cursor.png" ]]; then
+    install -Dm644 "$root/usr/share/pixmaps/co.anysphere.cursor.png" \
+      "${pkgdir}/usr/share/pixmaps/co.anysphere.cursor.png"
+  fi
+}
+
+package() {
+  case "$CARCH" in
+    x86_64) _package_x86_64 ;;
+    aarch64) _package_aarch64 ;;
+  esac
+}