Use /run in preference to /var/run if it exists.

Bug #822

INSTALL

@@ -134,11 +134,11 @@ Directory and file names:
         do not survive a system reboot.  This is typically where
         the time stamp directory is located.  By default, configure
         will use the first existing directory in the following list:
-	    /var/run, /var/db, /var/lib, /var/adm, /usr/adm
+	    /run /var/run, /var/db, /var/lib, /var/adm, /usr/adm
 	This directory should be cleared when the system reboots.
-	On systems that lack /var/run, the default rundir and vardir
-	may be the same.  In this case, only the ts directory inside
-	the rundir needs to be cleared at boot time.
+	On systems that lack /run or /var/run, the default rundir and
+	vardir may be the same.  In this case, only the ts directory
+	inside the rundir needs to be cleared at boot time.
 
   --with-vardir=DIR
         Set the directory to be used for sudo-specific files that

configure

@@ -25259,7 +25259,7 @@ fi
 $as_echo_n "checking for sudo run dir location... " >&6; }
 rundir="$with_rundir"
 if test -z "$rundir"; then
-    for d in /var/run /var/db /var/lib /var/adm /usr/adm; do
+    for d in /run /var/run /var/db /var/lib /var/adm /usr/adm; do
 	if test -d "$d"; then
 	    rundir="$d/sudo"
 	    break
@@ -28659,7 +28659,7 @@ $as_echo "$as_me: You will need to customize examples/pam.conf and install it as
     esac
 fi
 case "$rundir" in
-    /var/run*)
+    /run/*|/var/run/*)
 	clear_rundir=0
 	;;
     *)

configure.ac

@@ -4382,7 +4382,7 @@ dnl
 dnl Warn user if they may need to clear rundir manually.
 dnl
 case "$rundir" in
-    /var/run*)
+    /run/*|/var/run/*)
 	clear_rundir=0
 	;;
     *)

doc/sudoers.cat

@@ -2766,9 +2766,9 @@ SSEECCUURRIITTYY NNOOTTEESS
      ownership of files they create.
 
      While the time stamp directory _s_h_o_u_l_d be cleared at reboot time, not all
-     systems contain a _/_v_a_r_/_r_u_n directory.  To avoid potential problems,
-     ssuuddooeerrss will ignore time stamp files that date from before the machine
-     booted on systems where the boot time is available.
+     systems contain a _/_r_u_n or _/_v_a_r_/_r_u_n directory.  To avoid potential
+     problems, ssuuddooeerrss will ignore time stamp files that date from before the
+     machine booted on systems where the boot time is available.
 
      Some systems with graphical desktop environments allow unprivileged users
      to change the system clock.  Since ssuuddooeerrss relies on the system clock for
@@ -2897,4 +2897,4 @@ DDIISSCCLLAAIIMMEERR
      file distributed with ssuuddoo or https://www.sudo.ws/license.html for
      complete details.
 
-Sudo 1.8.23                    January 30, 2018                    Sudo 1.8.23
+Sudo 1.8.23                    February 19, 2018                   Sudo 1.8.23

doc/sudoers.man.in

@@ -21,7 +21,7 @@
 .\" Agency (DARPA) and Air Force Research Laboratory, Air Force
 .\" Materiel Command, USAF, under agreement number F39502-99-1-0512.
 .\"
-.TH "SUDOERS" "5" "January 30, 2018" "Sudo @PACKAGE_VERSION@" "File Formats Manual"
+.TH "SUDOERS" "5" "February 19, 2018" "Sudo @PACKAGE_VERSION@" "File Formats Manual"
 .nh
 .if n .ad l
 .SH "NAME"
@@ -5484,6 +5484,8 @@ unprivileged users to change the ownership of files they create.
 While the time stamp directory
 \fIshould\fR
 be cleared at reboot time, not all systems contain a
+\fI/run\fR
+or
 \fI/var/run\fR
 directory.
 To avoid potential problems,

doc/sudoers.mdoc.in

@@ -19,7 +19,7 @@
 .\" Agency (DARPA) and Air Force Research Laboratory, Air Force
 .\" Materiel Command, USAF, under agreement number F39502-99-1-0512.
 .\"
-.Dd January 30, 2018
+.Dd February 19, 2018
 .Dt SUDOERS @mansectform@
 .Os Sudo @PACKAGE_VERSION@
 .Sh NAME
@@ -5075,6 +5075,8 @@ unprivileged users to change the ownership of files they create.
 While the time stamp directory
 .Em should
 be cleared at reboot time, not all systems contain a
+.Pa /run
+or
 .Pa /var/run
 directory.
 To avoid potential problems,

m4/sudo.m4

@@ -108,7 +108,7 @@ dnl
 AC_DEFUN([SUDO_RUNDIR], [AC_MSG_CHECKING(for sudo run dir location)
 rundir="$with_rundir"
 if test -z "$rundir"; then
-    for d in /var/run /var/db /var/lib /var/adm /usr/adm; do
+    for d in /run /var/run /var/db /var/lib /var/adm /usr/adm; do
 	if test -d "$d"; then
 	    rundir="$d/sudo"
 	    break