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#!/bin/bash
# This should be readable by /bin/sh, but I'm going to assume bash.
# Sets up XDG environmental variables, so programs using them don't have to
# worry about checking if they are set.
# http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
[[ -n $XDG_DATA_HOME ]] || export XDG_DATA_HOME="$HOME/.local/share"
[[ -n $XDG_CONFIG_HOME ]] || export XDG_CONFIG_HOME="$HOME/.config"
[[ -n $XDG_DATA_DIRS ]] || export XDG_DATA_DIRS="/usr/local/share/:/usr/share/"
[[ -n $XDG_CONFIG_DIRS ]] || export XDG_CONFIG_DIRS="/etc/xdg"
[[ -n $XDG_CACHE_HOME ]] || export XDG_CACHE_HOME="$HOME/.cache"
# Check if XDG_RUNTIME_DIR is set, but has a bogus setting
if [[ -n $XDG_RUNTIME_DIR ]] && [[ ! -d $XDG_RUNTIME_DIR ]]; then
unset XDG_RUNTIME_DIR
fi
# Set XDG_RUNTIME_DIR if we can
if [[ -z $XDG_RUNTIME_DIR ]] && type flock &>/dev/null; then
_diy_xdg_runtime_login() {
export XDG_RUNTIME_DIR="$XDG_CACHE_HOME/xdg-runtime-dir/$HOSTNAME"
readonly XDG_RUNTIME_DIR
# There's a race condition here, between the `ln -s` and `flock`.
# But it's not like I'll be hammering a box with logins.
if [[ ! -d "$XDG_CACHE_HOME" ]]; then
local tmp="$(mktemp --tmpdir -- "${USER}@${HOSTNAME}-runtime.XXXXXXXXXX")"
mkdir -p -- "$XDG_CACHE_HOME/xdg-runtime-dir"
ln -sfT -- "$tmp" "$XDG_RUNTIME_DIR"
fi
if ! [[ /dev/fd/7 -ef "$XDG_CACHE_HOME/xdg-runtime-dir/.lock" ]]; then
exec 7 >"$XDG_CACHE_HOME/xdg-runtime-dir/.lock"
fi
if flock -sn 7; then
trap _diy_xdg_runtime_logout EXIT
fi
}
_diy_xdg_runtime_logout() {
if flock -xn 7; then
rm -rf -- "$(readlink "$XDG_RUNTIME_DIR")"
fi
}
_diy_xdg_runtime_login
fi
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