No such interface “org.freedesktop.portal.Screenshot” on object at path /org/freedesktop/portal/desktop

[smoak]

xdg-desktop-portal version 1.15.0 seems to say there is no Screenshot interface?

More details:

OS: Arch Linux (Linux 2TKZ9K3 5.15.60-1-lts #1 SMP Thu, 11 Aug 2022 14:09:59 +0000 x86_64 GNU/Linux)

• xdg-desktop-portal - 1.15.0-1
• xdg-desktop-portal-wlr - 0.6.0-1
• grim - 1.4.0-2
• sway - 1:1.7-9

Attempting to use the test script to trigger a screenshot gives me a dbus error:

dbus.exceptions.DBusException: org.freedesktop.DBus.Error.UnknownMethod: No such interface “org.freedesktop.portal.Screenshot” on object at path /org/freedesktop/portal/desktop

I execute sway like:

#!/bin/bash
export SDL_VIDEODRIVER=wayland
export _JAVA_AWT_WM_NONREPARENTING=1
export QT_QPA_PLATFORM=wayland
export XDG_CURRENT_DESKTOP=sway
export XDG_SESSION_DESKTOP=sway
exec sway

And in my sway config:

exec systemctl --user import-environment DISPLAY WAYLAND_DISPLAY SWAYSOCK
exec hash dbus-update-activation-environment 2>/dev/null && \
     dbus-update-activation-environment --systemd DISPLAY WAYLAND_DISPLAY SWAYSOCK

Running xdg-desktop-portal in verbose mode suggests that Screenshot is implemented though:

$ /usr/lib/xdg-desktop-portal --replace --verbose
XDP: load portals from /usr/share/xdg-desktop-portal/portals
XDP: loading /usr/share/xdg-desktop-portal/portals/gnome-keyring.portal
XDP: portal implementation for gnome
XDP: portal implementation supports org.freedesktop.impl.portal.Secret
XDP: loading /usr/share/xdg-desktop-portal/portals/wlr.portal
XDP: portal implementation for wlroots, sway, Wayfire, river, phosh
XDP: portal implementation supports org.freedesktop.impl.portal.Screenshot
XDP: portal implementation supports org.freedesktop.impl.portal.ScreenCast
XDP: providing portal org.freedesktop.portal.MemoryMonitor
XDP: providing portal org.freedesktop.portal.PowerProfileMonitor
XDP: providing portal org.freedesktop.portal.NetworkMonitor
XDP: providing portal org.freedesktop.portal.ProxyResolver
XDP: providing portal org.freedesktop.portal.Trash
XDP: providing portal org.freedesktop.portal.GameMode
XDP: providing portal org.freedesktop.portal.Realtime

(/usr/lib/xdg-desktop-portal:72505): xdg-desktop-portal-WARNING **: 15:46:22.466: No skeleton to export
XDP: Using wlr.portal for org.freedesktop.impl.portal.Screenshot in sway
XDP: Falling back to gnome-keyring.portal for org.freedesktop.impl.portal.Secret
XDP: providing portal org.freedesktop.portal.Secret
XDP: Using wlr.portal for org.freedesktop.impl.portal.ScreenCast in sway
XDP: providing portal org.freedesktop.portal.ScreenCast
XDP: org.freedesktop.portal.Desktop acquired

[smoak]

Downgrading xdg-desktop-portal (1.15.0-1 => 1.14.6-1) works with no issues.

[GeorgesStavracas]

(/usr/lib/xdg-desktop-portal:72505): xdg-desktop-portal-WARNING **: 15:46:22.466: No skeleton to export

The only way this error can happen is if the implementation D-Bus proxy fails to be created. I can confirm it works on xdg-desktop-portal-gnome, and xdg-desktop-portal-gtk, but I don't know if -kde and -wlr do something different that could be incompatible with the latest changes.

Since you seem to be using the -wlr implementation, consider reporting this to https://github.com/emersion/xdg-desktop-portal-wlr/

[GeorgesStavracas]

I think this is a particularity of xdg-desktop-portal-wlr which fails to export the interface in the absence of the D-Bus property, so closing since emersion/xdg-desktop-portal-wlr@c83b3cc landed there.