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fix(appimage): keep the XDG default data dirs on XDG_DATA_DIRS (#15938)

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AppRun sets XDG_DATA_DIRS to
"$APPDIR/usr/local/share:$APPDIR/usr/share:$XDG_DATA_DIRS". When the host
leaves XDG_DATA_DIRS unset, the result contains no /usr/share, and setting
the variable at all suppresses the XDG default of /usr/local/share:/usr/share.

gdk-pixbuf 2.43+ (Arch, CachyOS, Gentoo, Fedora, openSUSE) no longer ships PNG,
JPEG or WebP as loader modules; libgdk_pixbuf links libglycin and decodes them
through it, and glycin discovers its loaders in
$XDG_DATA_DIRS/glycin-loaders/<ver>/conf.d/*.conf. With /usr/share missing,
glycin finds none and every PNG decode inside the AppImage fails with
"Unrecognized image file format".

RustDesk sends remote cursors to flutter_custom_cursor as PNG, and that plugin
returns nullptr from a std::string function when the decode fails, so the first
non-default cursor of a session aborts the process:

    GdkPixbuf-CRITICAL **: gdk_pixbuf_copy: assertion 'GDK_IS_PIXBUF (pixbuf)' failed
    terminate called after throwing an instance of 'std::logic_error'
      what():  basic_string::_M_construct null not valid

Debian and Ubuntu compile PNG straight into libgdk_pixbuf and never reach
glycin, which is why this only affects non-Debian hosts.

Append the two XDG defaults so they are present when the host does not provide
them. They go last, so a session that sets XDG_DATA_DIRS properly keeps its own
precedence, and appending is a no-op where those paths are already listed.

Verified on CachyOS (gdk-pixbuf 2.44.7) against a stock 1.4.9 AppImage: with
only this variable changed, a full remote session runs without crashing and
renders remote cursors correctly.

Refs #4565 #5457 #7013 #9164 #10563 #11499 #12257 #14305 #14405 #15625

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
ben-leone
2026-08-22 11:21:48 +08:00
committed by GitHub
co-authored by Claude Opus 5
parent cbf9440281
commit e266380ee9
2 changed files with 4 additions and 0 deletions
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appimage/AppImageBuilder-aarch64.yml
+2
View File
@@ -76,6 +76,8 @@ AppDir:
env:
GIO_MODULE_DIR: /lib64/gio/modules:/usr/lib/aarch64-linux-gnu/gio/modules:$APPDIR/usr/lib/aarch64-linux-gnu/gio/modules
GDK_BACKEND: x11
# Append the XDG defaults: AppRun drops /usr/share when the host has XDG_DATA_DIRS unset, and gdk-pixbuf 2.43+ (Arch, Fedora) then finds no glycin loaders, so every PNG decode fails and the first remote cursor aborts the process.
XDG_DATA_DIRS: $APPDIR/usr/local/share:$APPDIR/usr/share:$XDG_DATA_DIRS:/usr/local/share:/usr/share
APPDIR_LIBRARY_PATH: /lib64:/usr/lib/aarch64-linux-gnu:$APPDIR/lib/aarch64-linux-gnu:$APPDIR/lib/aarch64-linux-gnu/security:$APPDIR/lib/systemd:$APPDIR/usr/lib/aarch64-linux-gnu:$APPDIR/usr/lib/aarch64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders:$APPDIR/usr/lib/aarch64-linux-gnu/gstreamer-1.0:$APPDIR/usr/lib/aarch64-linux-gnu/gtk-3.0/3.0.0/immodules:$APPDIR/usr/lib/aarch64-linux-gnu/gtk-3.0/3.0.0/printbackends:$APPDIR/usr/lib/aarch64-linux-gnu/krb5/plugins/preauth:$APPDIR/usr/lib/aarch64-linux-gnu/libcanberra-0.30:$APPDIR/usr/lib/aarch64-linux-gnu/pulseaudio:$APPDIR/usr/lib/aarch64-linux-gnu/sasl2:$APPDIR/usr/lib/aarch64-linux-gnu/vdpau:$APPDIR/usr/share/rustdesk/lib:$APPDIR/lib/aarch64
GST_PLUGIN_PATH: /lib64/gstreamer-1.0:/usr/lib/aarch64-linux-gnu/gstreamer-1.0:$APPDIR/usr/lib/aarch64-linux-gnu/gstreamer-1.0
GST_PLUGIN_SYSTEM_PATH: /lib64/gstreamer-1.0:/usr/lib/aarch64-linux-gnu/gstreamer-1.0:$APPDIR/usr/lib/aarch64-linux-gnu/gstreamer-1.0
appimage/AppImageBuilder-x86_64.yml
+2
View File
@@ -79,6 +79,8 @@ AppDir:
env:
GIO_MODULE_DIR: /lib64/gio/modules:/usr/lib/x86_64-linux-gnu/gio/modules:$APPDIR/usr/lib/x86_64-linux-gnu/gio/modules
GDK_BACKEND: x11
# Append the XDG defaults: AppRun drops /usr/share when the host has XDG_DATA_DIRS unset, and gdk-pixbuf 2.43+ (Arch, Fedora) then finds no glycin loaders, so every PNG decode fails and the first remote cursor aborts the process.
XDG_DATA_DIRS: $APPDIR/usr/local/share:$APPDIR/usr/share:$XDG_DATA_DIRS:/usr/local/share:/usr/share
APPDIR_LIBRARY_PATH: /lib64:/usr/lib/x86_64-linux-gnu:$APPDIR/lib/x86_64-linux-gnu:$APPDIR/lib/x86_64-linux-gnu/security:$APPDIR/lib/systemd:$APPDIR/usr/lib/x86_64-linux-gnu:$APPDIR/usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders:$APPDIR/usr/lib/x86_64-linux-gnu/gstreamer-1.0:$APPDIR/usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/immodules:$APPDIR/usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/printbackends:$APPDIR/usr/lib/x86_64-linux-gnu/krb5/plugins/preauth:$APPDIR/usr/lib/x86_64-linux-gnu/libcanberra-0.30:$APPDIR/usr/lib/x86_64-linux-gnu/pulseaudio:$APPDIR/usr/lib/x86_64-linux-gnu/sasl2:$APPDIR/usr/lib/x86_64-linux-gnu/vdpau:$APPDIR/usr/share/rustdesk/lib:$APPDIR/lib/x86_64
GST_PLUGIN_PATH: /lib64/gstreamer-1.0:/usr/lib/x86_64-linux-gnu/gstreamer-1.0:$APPDIR/usr/lib/x86_64-linux-gnu/gstreamer-1.0
GST_PLUGIN_SYSTEM_PATH: /lib64/gstreamer-1.0:/usr/lib/x86_64-linux-gnu/gstreamer-1.0:$APPDIR/usr/lib/x86_64-linux-gnu/gstreamer-1.0