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LP for rc (udpated)



a) Attached you'll find rc.patch for the current rc with some new little
fixes I missed the last night.

b) I was surprised when I found an rc file that sometimes it checks for
existing executable files, but sometimes not; sometimes it checks for
readable files, and sometimes just for existance; sometimes uses full
paths for commands, and sometimes not.

Does OpenBSD has a policy for how rc should be written?

c) I left some yp* and kerberos commands without fixing. It seems (for me)
like rc needs a re-engineering. Currently it doesn't fully prove for
required preconditions.

What do you think

--
ISC. Gerardo Santana Gómez Garrido
OpenBSD México http://www.openbsd.org.mx/~santana
4291424
--- rc.orig	Sun Jul  1 06:19:08 2001
+++ rc	Sun Jul  1 20:48:34 2001
@@ -38,7 +38,7 @@ export PATH
 if [ $1x = shutdownx ]; then
 	dd if=/dev/urandom of=/var/db/host.random bs=1024 count=64 >/dev/null 2>&1
 	chmod 600 /var/db/host.random >/dev/null 2>&1
-	if [ $? -eq 0 -a -f /etc/rc.shutdown ]; then
+	if [ $? -eq 0 -a -r /etc/rc.shutdown ]; then
 		echo /etc/rc.shutdown in progress...
 		. /etc/rc.shutdown
 		echo /etc/rc.shutdown complete.
@@ -52,25 +52,25 @@ if [ $1x = shutdownx ]; then
 fi
 
 # Configure ccd devices.
-if [ -f /etc/ccd.conf ]; then
-	ccdconfig -C
+if [ -s /etc/ccd.conf ]; then
+	/sbin/ccdconfig -C
 fi
 
 # Configure raid devices.
 for dev in 0 1 2 3; do
-	if [ -f /etc/raid$dev.conf ]; then
-		raidctl -c /etc/raid$dev.conf raid$dev
-		raidctl -v -P raid$dev
+	if [ -s /etc/raid$dev.conf ]; then
+		/sbin/raidctl -c /etc/raid$dev.conf raid$dev
+		/sbin/raidctl -v -P raid$dev
 	fi
 done
 
-swapctl -A -t blk
+/sbin/swapctl -A -t blk
 
 if [ -e /fastboot ]; then
 	echo "Fast boot: skipping disk checks."
 elif [ $1x = autobootx ]; then
 	echo "Automatic boot in progress: starting file system checks."
-	fsck -p
+	/sbin/fsck -p
 	case $? in
 	0)
 		;;
@@ -79,7 +79,7 @@ elif [ $1x = autobootx ]; then
 		;;
 	4)
 		echo "Rebooting..."
-		reboot
+		/sbin/reboot
 		echo "Reboot failed; help!"
 		exit 1
 		;;
@@ -114,35 +114,37 @@ echo 'setting tty flags'
 ttyflags -a
 
 if [ "X$pf" != X"NO" ]; then
-	echo "block in all\nblock out all" | pfctl -R - -e
+	echo "block in all\nblock out all" | /sbin/pfctl -R - -e
 fi
 
-if [ -f /etc/sysctl.conf ]; then
+if [ -s /etc/sysctl.conf ]; then
 (
 	# delete comments and blank lines
 	set -- `stripcom /etc/sysctl.conf`
 	while [ $# -ge 1 ] ; do
-		sysctl -w $1
+		/sbin/sysctl -w $1
 		shift
 	done
 )
 fi
 
 # set hostname, turn on network
-echo 'starting network'
-. /etc/netstart
+if [ -r /etc/netstart ]; then
+	echo 'starting network'
+	. /etc/netstart
+fi
 
 if [ "X$pf" != X"NO" ]; then
-	if [ -f ${nat_rules} ]; then
-		pfctl -N ${nat_rules}
+	if [ -r ${nat_rules} ]; then
+		/sbin/pfctl -N ${nat_rules}
 	fi
-	if [ -f ${pf_rules} ]; then
-		pfctl -R ${pf_rules}
+	if [ -r ${pf_rules} ]; then
+		/sbin/pfctl -R ${pf_rules}
 	fi
 fi
 
-mount /usr >/dev/null 2>&1
-mount /var >/dev/null 2>&1
+/sbin/mount /usr >/dev/null 2>&1
+/sbin/mount /var >/dev/null 2>&1
 
 # if there's no /var/db/host.random, make one through /dev/urandom
 if [ ! -f /var/db/host.random ]; then
@@ -168,19 +170,20 @@ rm -f /var/spool/uucp/STST/*
 (cd /var/run && { rm -rf -- *; install -c -m 664 -g utmp /dev/null utmp; })
 
 # save a copy of the boot messages
-dmesg >/var/run/dmesg.boot
+/sbin/dmesg >/var/run/dmesg.boot
 
-echo 'starting system logger'
-rm -f /dev/log
-if [ "X${named_flags}" != X"NO" -a "X${named_chroot}" != "X" ]; then
-	rm -f ${named_chroot}/dev/log
-	syslogd_flags="${syslogd_flags} -a ${named_chroot}/dev/log"
+if [ -x /usr/sbin/syslogd ]; then
+	rm -f /dev/log
+	if [ "X${named_flags}" != X"NO" -a "X${named_chroot}" != "X" ]; then
+		rm -f ${named_chroot}/dev/log
+		syslogd_flags="${syslogd_flags} -a ${named_chroot}/dev/log"
+	fi
+	echo 'starting system logger';	/usr/sbin/syslogd ${syslogd_flags}
 fi
-syslogd ${syslogd_flags}
 
 # $named_flags, $named_user, and $named_chroot are imported from /etc/rc.conf;
 # if $named_flags != NO, named is run.
-if [ "X${named_flags}" != X"NO" ]; then
+if [ "X${named_flags}" != X"NO" -a -x /usr/sbin/named ]; then
 	if [ "X${named_user}" != "X" -a "X${named_user}" != X"root" ]; then
 		named_flags="-u ${named_user} ${named_flags}"
 	fi
@@ -194,29 +197,29 @@ if [ "X${named_flags}" != X"NO" ]; then
 		fi
 		named_flags="-t ${named_chroot} ${named_flags}"
 	fi
-	echo 'starting named';		named $named_flags
+	echo 'starting named';		/usr/sbin/named $named_flags
 fi
 
 # $photurisd_flags is imported from /etc/rc.conf;
 # If $photurisd_flags == NO or /etc/photuris/photuris.conf doesn't exist, then
 # photurisd isn't run.
-if [ "X${photurisd_flags}" != X"NO" -a -e /etc/photuris/photuris.conf ]; then
-	echo 'starting photurisd';	photurisd ${photurisd_flags}
+if [ "X${photurisd_flags}" != X"NO" -a -r /etc/photuris/photuris.conf ]; then
+	echo 'starting photurisd';	/sbin/photurisd ${photurisd_flags}
 fi
 
 # $isakmpd_flags is imported from /etc/rc.conf;
 # If $isakmpd_flags == NO or /etc/isakmpd/isakmpd.conf doesn't exist, then
 # isakmpd isn't run.
-if [ "X${isakmpd_flags}" != X"NO" -a -e /etc/isakmpd/isakmpd.conf ]; then
-	echo 'starting isakmpd';	isakmpd ${isakmpd_flags}
+if [ "X${isakmpd_flags}" != X"NO" -a -r /etc/isakmpd/isakmpd.conf ]; then
+	echo 'starting isakmpd';	/sbin/isakmpd ${isakmpd_flags}
 fi
 
 echo -n 'starting rpc daemons:'
 
 # $portmap is imported from /etc/rc.conf;
 # if $portmap == YES, the portmapper is started.
-if [ X"${portmap}" = X"YES" ]; then
-	echo -n ' portmap';		portmap
+if [ X"${portmap}" = X"YES" -a -x /usr/sbin/portmap ]; then
+	echo -n ' portmap';		/usr/sbin/portmap
 fi
 
 if [ -d /var/yp/binding -a X`domainname` != X ]; then
@@ -254,53 +257,54 @@ if [ X${nfs_server} = X"YES" -a -s /etc/
     `sed -e '/^#/d' < /etc/exports | wc -l` -ne 0 ]; then
 	rm -f /var/db/mountdtab
 	echo -n > /var/db/mountdtab
-	echo -n ' mountd';		mountd
-	echo -n ' nfsd';		nfsd ${nfsd_flags}
-	if [ X${lockd} = X"YES" ]; then
-		echo -n ' rpc.lockd';	rpc.lockd
+	echo -n ' mountd';		/sbin/mountd
+	echo -n ' nfsd';		/sbin/nfsd ${nfsd_flags}
+	if [ X${lockd} = X"YES" -a -x /usr/sbin/rpc.lockd ]; then
+		echo -n ' rpc.lockd';	/usr/sbin/rpc.lockd
 	fi
 fi
 
-if [ X${amd} = X"YES" -a -e ${amd_master} ]; then
+if [ X${amd} = X"YES" -a -x /usr/sbin/amd -a -r ${amd_master} ]; then
 	echo -n ' amd'
-	(cd /etc/amd; amd -l syslog -x error,noinfo,nostats -p \
+	(cd /etc/amd; /usr/sbin/amd -l syslog -x error,noinfo,nostats -p \
 	    -a ${amd_dir} `cat ${amd_master}` > /var/run/amd.pid )
 fi
 
 # run rdate before timed
-if [ X"${rdate_flags}" != X"NO" ]; then
-        echo -n ' rdate';     rdate -s ${rdate_flags}
+if [ X"${rdate_flags}" != X"NO" -a -x /usr/sbin/rdate ]; then
+        echo -n ' rdate';     /usr/sbin/rdate -s ${rdate_flags}
 fi
 
 # $timed_flags is imported from /etc/rc.conf;
 # if $timed_flags == NO, timed isn't run.
-if [ "X${timed_flags}" != X"NO" ]; then
-	echo -n ' timed'; timed $timed_flags
+if [ "X${timed_flags}" != X"NO" -a -x /usr/sbin/timed ]; then
+	echo -n ' timed'; /usr/sbin/timed $timed_flags
 fi
 echo '.'
 
-mount -a -t nfs
+/sbin/mount -a -t nfs
 
-swapctl -A -t noblk
+/sbin/swapctl -A -t noblk
 
 # /var/crash should be a directory or a symbolic link
 # to the crash directory if core dumps are to be saved.
-if [ -d /var/crash ]; then
-	savecore /var/crash
+if [ -d /var/crash -a -x /sbin/savecore ]; then
+	/sbin/savecore /var/crash
 fi
 
-if [ "X${afs}" = X"YES" -a -c ${afs_device} -a -d ${afs_mount_point} ]; then
+if [ "X${afs}" = X"YES" -a -c ${afs_device} -a -d ${afs_mount_point} \
+	-a -x /usr/libexec/afsd ]; then
 	echo -n 'mounting afs:'
 	mount -t xfs ${afs_device} ${afs_mount_point}
 	/usr/libexec/afsd ${afsd_flags} -d ${afs_device}
 	echo ' done.'
 fi
 
-if [ "X${check_quotas}" = X"YES" ]; then
+if [ "X${check_quotas}" = X"YES" -a -x /usr/sbin/quotaon ]; then
 	echo -n 'checking quotas:'
-	quotacheck -a
+	/sbin/quotacheck -a
 	echo ' done.'
-	quotaon -a
+	/usr/sbin/quotaon -a
 fi
 
 # build ps databases
@@ -315,8 +319,8 @@ chmod 666 /dev/tty[pqrstuvwxyzPQRST]*
 chown root.wheel /dev/tty[pqrstuvwxyzPQRST]*
 
 # check the password temp/lock file
-if [ -f /etc/ptmp ]; then
-	logger -s -p auth.err \
+if [ -f /etc/ptmp -a -x /usr/bin/logger ]; then
+	/usr/bin/logger -s -p auth.err \
 	'password file may be incorrect -- /etc/ptmp exists'
 fi
 
@@ -328,19 +332,19 @@ echo clearing /tmp
     find . ! -name . ! -name lost+found ! -name quota.user \
 	! -name quota.group -execdir rm -rf -- {} \; -type d -prune)
 
-[ -f /etc/rc.securelevel ] && . /etc/rc.securelevel
+[ -r /etc/rc.securelevel ] && . /etc/rc.securelevel
 if [ X${securelevel} != X"" ]; then
 	echo -n 'setting kernel security level: '
-	sysctl -w kern.securelevel=${securelevel}
+	/sbin/sysctl -w kern.securelevel=${securelevel}
 fi
 
 # patch /etc/motd
-if [ ! -f /etc/motd ]; then
+if [ ! -r /etc/motd ]; then
 	install -c -o root -g wheel -m 664 /dev/null /etc/motd
 fi
 T=`mktemp /tmp/_motd.XXXXXXXXXX`
 if [ $? -eq 0 ]; then
-	sysctl -n kern.version | sed 1q > $T
+	/sbin/sysctl -n kern.version | sed 1q > $T
 	echo "" >> $T
 	sed '1,/^$/d' < /etc/motd >> $T
 	cmp -s $T /etc/motd || cp $T /etc/motd
@@ -351,11 +355,11 @@ if [ -x /usr/libexec/vi.recover ]; then
 	echo 'preserving editor files';	/usr/libexec/vi.recover
 fi
 
-if [ -f /var/account/acct ]; then
-	echo 'turning on accounting';	accton /var/account/acct
+if [ -w /var/account/acct -a -x /usr/sbin/accton ]; then
+	echo 'turning on accounting';	/usr/sbin/accton /var/account/acct
 fi
 
-if [ -f /sbin/ldconfig ]; then
+if [ -x /sbin/ldconfig ]; then
 	echo 'creating runtime link editor directory cache.'
 	if [ -d /usr/local/lib ]; then
 		shlib_dirs="$shlib_dirs /usr/local/lib"
@@ -363,10 +367,10 @@ if [ -f /sbin/ldconfig ]; then
 	if [ -d /usr/X11R6/lib ]; then
 		shlib_dirs="$shlib_dirs /usr/X11R6/lib"
 	fi
-	ldconfig $shlib_dirs
+	/sbin/ldconfig $shlib_dirs
 fi
 
-if [ ! -f /etc/ssh_host_dsa_key ]; then
+if [ ! -r /etc/ssh_host_dsa_key ]; then
 	echo -n "ssh-keygen: generating new DSA host key... "
 	if /usr/bin/ssh-keygen -q -t dsa -f /etc/ssh_host_dsa_key -N ''; then
 		echo done.
@@ -374,7 +378,7 @@ if [ ! -f /etc/ssh_host_dsa_key ]; then
 		echo failed.
 	fi
 fi
-if [ ! -f /etc/ssh_host_rsa_key ]; then
+if [ ! -r /etc/ssh_host_rsa_key ]; then
 	echo -n "ssh-keygen: generating new RSA host key... "
 	if /usr/bin/ssh-keygen -q -t rsa -f /etc/ssh_host_rsa_key -N ''; then
 		echo done.
@@ -396,23 +400,24 @@ echo -n starting network daemons:
 # $gated and $routed_flags are imported from /etc/rc.conf.
 # If $gated == YES, gated is used; otherwise routed.
 # If $routed_flags == NO, routed isn't run.
-if [ X${gated} = X"YES" -a -e /etc/gated.conf ]; then
+if [ X${gated} = X"YES" -a -r /etc/gated.conf -a -x /usr/local/sbin/gated ]
+then
 	echo -n ' gated';		/usr/local/sbin/gated $gated_flags
 elif [ "X${routed_flags}" != X"NO" ]; then
-	echo -n ' routed';		routed $routed_flags
+	echo -n ' routed';		/sbin/routed $routed_flags
 fi
 
 # $mrouted_flags is imported from /etc/rc.conf;
 # If $mrouted_flags == NO, then mrouted isn't run.
-if [ "X${mrouted_flags}" != X"NO" ]; then
-	echo -n ' mrouted';		mrouted $mrouted_flags
+if [ "X${mrouted_flags}" != X"NO" -a -x /usr/sbin/mrouted ]; then
+	echo -n ' mrouted';		/usr/sbin/mrouted $mrouted_flags
 fi
 
 # $dhcpd_flags is imported from /etc/rc.conf
 # If $dhcpd_flags == NO or /etc/dhcpd.conf doesn't exist, then dhcpd isn't run.
-if [ "X${dhcpd_flags}" != X"NO" -a -f /etc/dhcpd.conf ]; then
+if [ "X${dhcpd_flags}" != X"NO" -a -r /etc/dhcpd.conf -a /usr/sbin/dhcpd ]; then
 	touch /var/db/dhcpd.leases
-	if [ -f /etc/dhcpd.interfaces ]; then
+	if [ -r /etc/dhcpd.interfaces ]; then
 		dhcpd_ifs=`awk -F\# '{ print $1; }' < /etc/dhcpd.interfaces`
 	fi
 	echo -n ' dhcpd';	/usr/sbin/dhcpd ${dhcpd_flags} ${dhcpd_ifs}
@@ -423,20 +428,21 @@ if ifconfig lo0 inet6 >/dev/null 2>&1; t
 	if [ "X${fw}" == X"0" ]; then
 		# $rtsold_flags is imported from /etc/rc.conf;
 		# If $rtsold_flags == NO, then rtsold isn't run.
-		if [ "X${rtsold_flags}" != X"NO" ]; then
+		if [ "X${rtsold_flags}" != X"NO" -a -x /usr/sbin/rtsold ]; then
 			echo -n ' rtsold'
 			/usr/sbin/rtsold ${rtsold_flags}
 		fi
 	else
 		# $route6d_flags is imported from /etc/rc.conf;
 		# If $route6d_flags == NO, then route6d isn't run.
-		if [ "X${route6d_flags}" != X"NO" ]; then
+		if [ "X${route6d_flags}" != X"NO" -a -x /usr/sbin/route6d ]
+		then
 			echo -n ' route6d'
 			/usr/sbin/route6d ${route6d_flags}
 		fi
 		# $rtadvd_flags is imported from /etc/rc.conf;
 		# If $rtadvd_flags == NO, then rtadvd isn't run.
-		if [ "X${rtadvd_flags}" != X"NO" ]; then
+		if [ "X${rtadvd_flags}" != X"NO" -a -x /usr/sbin/rtadvd ]; then
 			echo -n ' rtadvd'
 			/usr/sbin/rtadvd ${rtadvd_flags}
 		fi
@@ -445,13 +451,13 @@ fi
 
 # $rwhod is imported from /etc/rc.conf;
 # if $rwhod == YES, rwhod is run.
-if [ X${rwhod} = X"YES" ]; then
-	echo -n ' rwhod';		rwhod
+if [ X${rwhod} = X"YES" -a -x /usr/sbin/rwhod ]; then
+	echo -n ' rwhod';		/usr/sbin/rwhod
 fi
 
 
-if [ X${lpd_flags} != X"NO" ]; then
-	echo -n ' printer';		lpd ${lpd_flags}
+if [ X${lpd_flags} != X"NO" -a -x /usr/sbin/lpd ]; then
+	echo -n ' printer';		/usr/sbin/lpd ${lpd_flags}
 fi
 
 # $sendmail_flags is imported from /etc/rc.conf;
@@ -459,7 +465,8 @@ fi
 # sendmail isn't run.  We call sendmail with a full path so that
 # SIGHUP works.  Note that /usr/sbin/sendmail may actually call a
 # mailer other than sendmail, depending on /etc/mailer.conf.
-if [ "X${sendmail_flags}" != X"NO" -a -s /etc/mailer.conf ]; then
+if [ "X${sendmail_flags}" != X"NO" -a -s /etc/mailer.conf \
+	-a -x /usr/sbin/sendmail ]; then
 	echo -n ' sendmail';		( /usr/sbin/sendmail ${sendmail_flags} >/dev/null 2>&1 & )
 fi
 
@@ -469,61 +476,63 @@ if [ "X${httpd_flags}" != X"NO"  ]; then
 	echo -n ' httpd';		/usr/sbin/httpd ${httpd_flags}
 fi
 
-if [ "X${ftpd_flags}" != X"NO" ]; then
+if [ "X${ftpd_flags}" != X"NO" -a -x /usr/libexec/ftpd ]; then
 	echo -n ' ftpd';		/usr/libexec/ftpd ${ftpd_flags}
 fi
 
-if [ "X${identd_flags}" != X"NO" ]; then
+if [ "X${identd_flags}" != X"NO" -a -x /usr/libexec/identd ]; then
 	echo -n ' identd';		/usr/libexec/identd ${identd_flags}
 fi
 
 # $smtpfwdd_flags is imported from /etc/rc.conf;
 # If $smtpfwdd_flags == NO, smtpfwdd isn't run.
-if [ "X${smtpfwdd_flags}" != X"NO" ]; then
+if [ "X${smtpfwdd_flags}" != X"NO" -a -x /usr/libexec/smtpfwdd ]; then
 	echo -n ' smtpfwdd';	/usr/libexec/smtpfwdd ${smtpfwdd_flags}
 fi
 
 
-if [ X${inetd} = X"YES" -a -e /etc/inetd.conf ]; then
-	echo -n ' inetd';		inetd
+if [ X${inetd} = X"YES" -a -r /etc/inetd.conf -a -x /usr/sbin/inetd ]; then
+	echo -n ' inetd';		/usr/sbin/inetd
 fi
 
 # $rarpd_flags is imported from /etc/rc.conf;
 # If $rarpd_flags == NO or /etc/ethers doesn't exist, then
 # rarpd isn't run.
-if [ "X${rarpd_flags}" != X"NO" -a -s /etc/ethers ]; then
-	echo -n ' rarpd';		rarpd ${rarpd_flags}
+if [ "X${rarpd_flags}" != X"NO" -a -s /etc/ethers -a -x /usr/sbin/rarpd ]; then
+	echo -n ' rarpd';		/usr/sbin/rarpd ${rarpd_flags}
 fi
 
 # $bootparamd_flags is imported from /etc/rc.conf;
 # If $bootparamd_flags == NO or /etc/bootparams doesn't exist, then
 # bootparamd isn't run.
-if [ "X${bootparamd_flags}" != X"NO" -a -s /etc/bootparams ]; then
-	echo -n ' rpc.bootparamd';	rpc.bootparamd ${bootparamd_flags}
+if [ "X${bootparamd_flags}" != X"NO" -a -s /etc/bootparams \
+	-a -x /usr/sbin/rpc.bootparamd ]; then
+	echo -n ' rpc.bootparamd';	/usr/sbin/rpc.bootparamd ${bootparamd_flags}
 fi
 
 # $rbootd_flags is imported from /etc/rc.conf;
 # If $rbootd_flags == NO or /etc/rbootd.conf doesn't exist, then
 # rbootd isn't run.
-if [ "X${rbootd_flags}" != X"NO" -a -s /etc/rbootd.conf ]; then
-	echo -n ' rbootd';		rbootd ${rbootd_flags}
+if [ "X${rbootd_flags}" != X"NO" -a -s /etc/rbootd.conf \
+	-a -x /usr/sbin/rbootd ]; then
+	echo -n ' rbootd';		/usr/sbin/rbootd ${rbootd_flags}
 fi
 
 # $mopd_flags is imported from /etc/rc.conf;
 # If $mopd_flags == NO or /tftpboot/mop doesn't exist, then
 # mopd isn't run.
-if [ "X${mopd_flags}" != X"NO" -a -d /tftpboot/mop ]; then
-	echo -n ' mopd';		mopd ${mopd_flags}
+if [ "X${mopd_flags}" != X"NO" -a -d /tftpboot/mop -a -x /usr/sbin/mopd ]; then
+	echo -n ' mopd';		/usr/sbin/mopd ${mopd_flags}
 fi
 
-if [ X"${sshd_flags}" != X"NO" ]; then
+if [ X"${sshd_flags}" != X"NO" -a -x /usr/sbin/sshd ]; then
 	/usr/sbin/sshd ${sshd_flags};	echo -n ' sshd'
 fi
 
 echo '.'
 
-if [ -f /sbin/kbd -a -f /etc/kbdtype ]; then
-	kbd `cat /etc/kbdtype`
+if [ -x /sbin/kbd -a -r /etc/kbdtype ]; then
+	/sbin/kbd `cat /etc/kbdtype`
 fi
 
 # KerberosIV runs ONLY on the KDC servers
@@ -556,7 +565,7 @@ if [ X${krb5_slave_kdc} = X"YES" ]; then
 	# Remember to enable hpropd in inetd.conf
 fi
 
-[ -f /etc/rc.local ] && . /etc/rc.local
+[ -r /etc/rc.local ] && . /etc/rc.local
 
 echo -n standard daemons:
 
@@ -574,14 +583,14 @@ echo -n ' cron';		cron
 
 echo '.'
 
-date
+/bin/date
 
 if [ "X${wsmoused_flags}" != X"NO" -a -x /usr/sbin/wsmoused ]; then
 	echo 'starting wsmoused...';	/usr/sbin/wsmoused ${wsmoused_flags}
 fi
 
 # Alternatively, on some architectures, xdm may be started in /etc/ttys.
-if [ "X${xdm_flags}" != X"NO" ]; then
+if [ "X${xdm_flags}" != X"NO" -a -x /usr/X11R6/bin/xdm ]; then
 	echo 'starting xdm...';		/usr/X11R6/bin/xdm ${xdm_flags}
 fi



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