/etc/profile.d/xdg_dirs_desktop_session.sh is in gnome-session-common 3.28.1-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | # /etc/profile.d/desktop_session_xdg_dirs.sh - Prepend a $DESKTOP_SESSION-named directory to $XDG_CONFIG_DIRS and $XDG_DATA_DIRS
DEFAULT_XDG_CONFIG_DIRS='/etc/xdg'
DEFAULT_XDG_DATA_DIRS='/usr/local/share/:/usr/share/'
if [ -n "$DESKTOP_SESSION" ]; then
# readd default if was empty
if [ -z "$XDG_CONFIG_DIRS" ]; then
XDG_CONFIG_DIRS="$DEFAULT_XDG_CONFIG_DIRS"
fi
if [ -n "${XDG_CONFIG_DIRS##*$DEFAULT_XDG_CONFIG_DIRS/xdg-$DESKTOP_SESSION*}" ]; then
XDG_CONFIG_DIRS="$DEFAULT_XDG_CONFIG_DIRS"/xdg-"$DESKTOP_SESSION":"$XDG_CONFIG_DIRS"
fi
export XDG_CONFIG_DIRS
# gnome is already added if gnome-session installed
if [ "$DESKTOP_SESSION" != "gnome" ]; then
if [ -z "$XDG_DATA_DIRS" ]; then
XDG_DATA_DIRS="$DEFAULT_XDG_DATA_DIRS"
fi
if [ -n "${XDG_DATA_DIRS##*/usr/share/$DESKTOP_SESSION*}" ]; then
XDG_DATA_DIRS=/usr/share/"$DESKTOP_SESSION":"$XDG_DATA_DIRS"
fi
export XDG_DATA_DIRS
fi
fi
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