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#!/bin/sh
# Copyright 2022 Collabora Ltd.
# SPDX-License-Identifier: MIT
# Usage: check-runstatedir.sh /run/dbus/system_bus_socket
set -e
set -u
same_file () {
# Many shells implement test -ef (test whether two names point to
# the same file), but POSIX doesn't require it, so fall back to
# comparing realpath output if necessary. We prefer test -ef if
# available, since it does the right thing for bind-mounts, not just
# symlinks
if test / -ef / 2>/dev/null; then
test "$1" -ef "$2"
else
test "$(realpath "$1")" = "$(realpath "$2")"
fi
}
if [ -e /run ] && [ -e /var/run ] && ! same_file /run /var/run; then
echo
echo "WARNING: /run and /var/run are not the same directory."
echo "| Tools that do not agree on whether a socket is in /run or in"
echo "| /var/run will fail to interoperate."
echo "| Ask your OS distributor to make these two directories equivalent"
echo "| via a symbolic link or bind mount: there is no useful reason to"
echo "| make them different."
echo
fi
system_socket="$1"
case "$system_socket" in
(/run/dbus/system_bus_socket)
# --with-system-socket=/run/dbus/system_bus_socket
if ! same_file /run /var/run; then
echo
echo "WARNING: system bus socket: /run/dbus/system_bus_socket"
echo "| The system bus has been configured to listen on"
echo "| /run/dbus/system_bus_socket, but /run is not the same"
echo "| as /var/run on this system."
echo "|"
echo "| Most D-Bus implementations will expect to find the D-Bus"
echo "| system bus socket at /var/run/dbus/system_bus_socket."
echo "| Consider creating a symbolic link."
echo
fi
;;
(/var/run/dbus/system_bus_socket)
# e.g. --localstatedir=/var
if ! same_file /run /var/run; then
echo
echo "NOTE: system bus socket: /var/run/dbus/system_bus_socket"
echo "| The system bus has been configured to listen on"
echo "| /var/run/dbus/system_bus_socket, but /run is not the same"
echo "| as /var/run on this system."
echo "|"
echo "| Some D-Bus implementations might expect to find the"
echo "| D-Bus system bus socket at /run/dbus/system_bus_socket."
echo "| Consider creating a symbolic link."
echo
fi
;;
(*)
# e.g. --prefix=/opt/dbus
echo
echo "NOTE: system bus listens on $system_socket"
echo "| This build of dbus will not interoperate with the well-known"
echo "| system bus socket, /var/run/dbus/system_bus_socket."
echo
;;
esac
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