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#!/hint/sh
# Set XDG_RUNTIME_DIR if we can
if [ -z "$XDG_RUNTIME_DIR" ] && shopt -q login_shell && type flock &>/dev/null; then
_diy_xdg_runtime_login() {
export XDG_RUNTIME_DIR="$XDG_CACHE_HOME/xdg-runtime-dir/$HOSTNAME"
# There's a race condition here, between the `ln -s` and `flock`.
# But it's not like I'll be hammering a box with logins.
if [ ! -d "$XDG_RUNTIME_DIR" ]; then
local tmp="$(mktemp -d --tmpdir -- "${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"
if flock -sn 7; then
# Unfortunately this doesn't survive across exec(1).
trap _diy_xdg_runtime_logout EXIT
fi
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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