ntp: make servers configurable and default to none configured

People can't blindly use pool.ntp.org, especially if they are building
for a product or something that could be used in a product, so at least
try to get people to do the right thing and not use pool.ntp.org by
default.

The previous network interface up script is now installed as
ntpdate-sync in ${bindir} (and symlinked as the network if-up script).
NTPSERVERS needs to be set in /etc/default/ntpdate.default at runtime,
or a different version of this file with a default value can be provided
in a bbappend. (If you intend to use ntpd you will also want to provide
an ntp.conf with the appropriate server(s) set there as well.)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

meta-networking/recipes-support/ntp/files/ntp.conf

@@ -5,7 +5,7 @@ driftfile /etc/ntp.drift
 # This obtains a random server which will be close
 # (in IP terms) to the machine.  Add other servers
 # as required, or change this.
-server pool.ntp.org
+server time.server.example.com
 # Using local hardware clock as fallback
 # Disable this when using ntpd -q -g -x as ntpdate or it will sync to itself
 server 127.127.1.0

meta-networking/recipes-support/ntp/files/ntpdate

@@ -6,11 +6,16 @@ test -x /usr/bin/ntpdate || exit 0
 
 if test -f /etc/default/ntpdate ; then
 . /etc/default/ntpdate
-else
-NTPSERVERS="pool.ntp.org"
 fi
 
-test -n "$NTPSERVERS" || exit 0
+if [ "$NTPSERVERS" = "" ] ; then
+	if [ "$METHOD" = "" -a "$1" != "silent" ] ; then
+		echo "Please set NTPSERVERS in /etc/default/ntpdate"
+		exit 1
+	else
+		exit 0
+	fi
+fi
 
 # This is a heuristic:  The idea is that if a static interface is brought
 # up, that is a major event, and we can put in some extra effort to fix

meta-networking/recipes-support/ntp/files/ntpdate.default

@@ -0,0 +1,7 @@
+# Configuration script used by ntpdate-sync script
+
+NTPSERVERS=""
+
+# Set to "yes" to write time to hardware clock on success
+UPDATE_HWCLOCK="no"
+

meta-networking/recipes-support/ntp/ntp.inc

@@ -17,6 +17,7 @@ SRC_URI = "http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-${PV}.tar.g
            file://ntpd \
            file://ntp.conf \
            file://ntpdate \
+           file://ntpdate.default \
            "
 
 inherit autotools update-rc.d
@@ -37,15 +38,20 @@ do_install_append() {
 	install -d ${D}${sysconfdir}/init.d
 	install -m 644 ${WORKDIR}/ntp.conf ${D}${sysconfdir}
 	install -m 755 ${WORKDIR}/ntpd ${D}${sysconfdir}/init.d
+	install -d ${D}${bindir}
+	install -m 755 ${WORKDIR}/ntpdate ${D}${bindir}/ntpdate-sync
 
 	# Fix hardcoded paths in scripts
-	sed -i 's!/usr/sbin/!${sbindir}/!g' ${D}${sysconfdir}/init.d/ntpd
+	sed -i 's!/usr/sbin/!${sbindir}/!g' ${D}${sysconfdir}/init.d/ntpd ${D}${bindir}/ntpdate-sync
-	sed -i 's!/usr/bin/!${bindir}/!g' ${D}${sysconfdir}/init.d/ntpd
+	sed -i 's!/usr/bin/!${bindir}/!g' ${D}${sysconfdir}/init.d/ntpd ${D}${bindir}/ntpdate-sync
-	sed -i 's!/etc/!${sysconfdir}/!g' ${D}${sysconfdir}/init.d/ntpd
+	sed -i 's!/etc/!${sysconfdir}/!g' ${D}${sysconfdir}/init.d/ntpd ${D}${bindir}/ntpdate-sync
-	sed -i 's!/var/!${localstatedir}/!g' ${D}${sysconfdir}/init.d/ntpd
+	sed -i 's!/var/!${localstatedir}/!g' ${D}${sysconfdir}/init.d/ntpd ${D}${bindir}/ntpdate-sync
+	sed -i 's!^PATH=.*!PATH=${base_sbindir}:${base_bindir}:${sbindir}:${bindir}!' ${D}${bindir}/ntpdate-sync
 
-	install -d ${D}${sysconfdir}/network/if-up.d
+	install -d ${D}/${sysconfdir}/default
-	install -m 755 ${WORKDIR}/ntpdate ${D}${sysconfdir}/network/if-up.d
+	install -m 644 ${WORKDIR}/ntpdate.default ${D}${sysconfdir}/default/ntpdate
+	install -d ${D}/${sysconfdir}/network/if-up.d
+	ln -s ${bindir}/ntpdate-sync ${D}/${sysconfdir}/network/if-up.d
 }
 
 PACKAGES += "ntpdate ${PN}-tickadj ${PN}-utils"
@@ -64,9 +70,10 @@ RSUGGESTS_${PN} = "iana-etc"
 FILES_${PN} = "${bindir}/ntpd ${sysconfdir}/ntp.conf ${sysconfdir}/init.d/ntpd ${sbindir} ${libdir}"
 FILES_${PN}-tickadj = "${bindir}/tickadj"
 FILES_${PN}-utils = "${bindir}"
-FILES_ntpdate = "${bindir}/ntpdate ${sysconfdir}/network/if-up.d/ntpdate"
+FILES_ntpdate = "${bindir}/ntpdate ${sysconfdir}/network/if-up.d/ntpdate-sync ${bindir}/ntpdate-sync ${sysconfdir}/default/ntpdate"
 
 CONFFILES_${PN} = "${sysconfdir}/ntp.conf"
+CONFFILES_ntpdate = "${sysconfdir}/default/ntpdate"
 
 INITSCRIPT_NAME = "ntpd"
 # No dependencies, so just go in at the standard level (20)
@@ -79,7 +86,7 @@ else
         if ! grep -q -s ntpdate /var/spool/cron/root; then
                 echo "adding crontab"
                 test -d /var/spool/cron || mkdir -p /var/spool/cron
-                echo "30 * * * *    /usr/bin/ntpdate -b -s -u pool.ntp.org" >> /var/spool/cron/root
+                echo "30 * * * *    ${bindir}/ntpdate-sync silent" >> /var/spool/cron/root
         fi
 fi
 }