[ntp]: Do not disable reader for error ENOBUFS (#2529)

Need to build NTP 4.2.6 locally due to a Bug in NTP 4.2.6.

Changes:
1.) Remove 'apt-get ntp' step from build_debian.sh.
2.) Add NTP package as part of base image in slave.mk.
3.) NTP Makefile for Sonic Build System rules/ntp.mk.
4.) NTP Source Makefile src/ntp/Makefile.
5.) Patch to fix the issure src/ntp/patch.

Signed-off-by: Praveen Chaudhary<pchaudhary@linkedin.com>

* [src/ntp/Makefile]: DSC file URL points to sonic storage.

Signed-off-by: Praveen Chaudhary<pchaudhary@linkedin.com>

* [src/ntp/Makefile]: Changes to build with sonic blob.

build_debian.sh

@@ -199,7 +199,6 @@ sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y in
     vim                     \
     tcpdump                 \
     dbus                    \
-    ntp                     \
     ntpstat                 \
     openssh-server          \
     python                  \

files/build_templates/sonic_debian_extension.j2

@@ -102,6 +102,10 @@ sudo dpkg --root=$FILESYSTEM_ROOT -i target/debs/bash_*.deb || \
 # in bash.bashrc, so we copy a version of the file with it enabled here.
 sudo cp -f $IMAGE_CONFIGS/bash/bash.bashrc $FILESYSTEM_ROOT/etc/
 
+# Install NTP version 4.2.6 this way until required fix is available for Jessie.
+sudo dpkg --root=$FILESYSTEM_ROOT -i target/debs/ntp_4.2.6*.deb || \
+    sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y install -f
+
 # Install SONiC Device Data  (and its dependencies via 'apt-get -y install -f')
 sudo dpkg --root=$FILESYSTEM_ROOT -i target/debs/sonic-device-data_*.deb || \
     sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y install -f

rules/ntp.mk

@@ -0,0 +1,13 @@
+# ntp_4.2.6.p5+dfsg-7+deb8u2.deb
+
+NTP_VERSION_MAJOR = 4.2.6
+NTP_VERSION_SUFFIX = .p5+dfsg
+NTP_VERSION_SUFFIX_NUM = 7+deb8u2
+NTP_VERSION_FULL = $(NTP_VERSION_MAJOR)$(NTP_VERSION_SUFFIX)-$(NTP_VERSION_SUFFIX_NUM)
+NTP_VERSION = $(NTP_VERSION_MAJOR)$(NTP_VERSION_SUFFIX)
+
+export NTP_VERSION NTP_VERSION_FULL
+
+NTP = ntp_$(NTP_VERSION_FULL)_amd64.deb
+$(NTP)_SRC_PATH = $(SRC_PATH)/ntp
+SONIC_MAKE_DEBS += $(NTP)

slave.mk

@@ -430,6 +430,7 @@ $(addprefix $(TARGET_PATH)/, $(SONIC_INSTALLERS)) : $(TARGET_PATH)/% : \
                 $(SONIC_UTILS) \
                 $(BASH) \
                 $(LIBWRAP) \
+                $(NTP) \
                 $(LIBPAM_TACPLUS) \
                 $(LIBNSS_TACPLUS)) \
         $$(addprefix $(TARGET_PATH)/,$$($$*_DOCKERS)) \

sonic-slave/Dockerfile

@@ -215,7 +215,12 @@ RUN apt-get update && apt-get install -y \
         texlive-latex-extra \
         texlive-latex-recommended \
 # For bash
-        texi2html
+        texi2html \
+# For ntp
+        autogen \
+        libopts25-dev \
+        pps-tools \
+        dh-apparmor
 
 # For linux build
 RUN apt-get -y build-dep linux

src/ntp/Makefile

@@ -0,0 +1,35 @@
+SHELL = /bin/bash
+.ONESHELL:
+.SHELLFLAGS += -e
+
+MAIN_TARGET = ntp_$(NTP_VERSION_FULL)_amd64.deb
+
+DSC_FILE = ntp_$(NTP_VERSION_FULL).dsc
+ORIG_FILE = ntp_$(NTP_VERSION).orig.tar.gz
+DEBIAN_FILE = ntp_$(NTP_VERSION_FULL).debian.tar.xz
+
+DSC_FILE_URL = "https://sonicstorage.blob.core.windows.net/packages/debian/$(DSC_FILE)?sv=2015-04-05&sr=b&sig=HxuXOJsIfkj3lF2TlCShil7lFFf90Zh8oBNTfaka%2FNc%3D&se=2155-12-30T06%3A25%3A21Z&sp=r"
+ORIG_FILE_URL = "https://sonicstorage.blob.core.windows.net/packages/debian/$(ORIG_FILE)?sv=2015-04-05&sr=b&sig=bZcv%2B25Ke%2FBcWWd8WdBuK9sMDkcF45Yd2hAmmHBHfTk%3D&se=2155-12-30T06%3A26%3A27Z&sp=r"
+DEBIAN_FILE_URL = "https://sonicstorage.blob.core.windows.net/packages/debian/$(DEBIAN_FILE)?sv=2015-04-05&sr=b&sig=WGy6DcbTXo9FDRq%2F0gaiwV7oAYY86dHSUlvGaMrINBM%3D&se=2155-12-30T06%3A21%3A57Z&sp=r"
+
+$(addprefix $(DEST)/, $(MAIN_TARGET)): $(DEST)/% :
+	rm -rf ntp-$(NTP_VERSION)
+	wget -O "$(DSC_FILE)" $(DSC_FILE_URL)
+	wget -O "$(ORIG_FILE)" $(ORIG_FILE_URL)
+	wget -O "$(DEBIAN_FILE)" $(DEBIAN_FILE_URL)
+
+	dpkg-source -x $(DSC_FILE)
+
+	pushd ntp-$(NTP_VERSION)
+
+	git init
+	git add -f *
+	git commit -m "original source files"
+
+	stg init
+	stg import -s ../patch/series
+
+	dpkg-buildpackage -us -uc -b -j$(SONIC_CONFIG_MAKE_JOBS)
+	popd
+
+	mv $* $(DEST)/

src/ntp/patch/0001-donot-disable-reader-kernel-enobufs.patch

@@ -0,0 +1,31 @@
+commit 1534de6d3ef2d188d1e2697f7180786ee5a8a9dc
+Author: Praveen Chaudhary <pchaudhary@linkedin.com>
+Date:   Sat Feb 2 20:12:53 2019 -0800
+
+    [ntp_io.c]: Do not disable reader for error ENOBUFS.
+    
+    Signed-off-by: Praveen Chaudhary<pchaudhary@linkedin.com>
+
+diff --git a/ntpd/ntp_io.c b/ntpd/ntp_io.c
+index f2a2404..fe5c94d 100644
+--- a/ntpd/ntp_io.c
++++ b/ntpd/ntp_io.c
+@@ -4430,10 +4430,14 @@ process_routing_msgs(struct asyncio_reader *reader)
+ 	cnt = read(reader->fd, buffer, sizeof(buffer));
+ 	
+ 	if (cnt < 0) {
+-		msyslog(LOG_ERR,
+-			"i/o error on routing socket %m - disabling");
+-		remove_asyncio_reader(reader);
+-		delete_asyncio_reader(reader);
++       if (errno == ENOBUFS) {
++       	msyslog(LOG_ERR, "routing socket reports: %m");
++       } else {
++       	msyslog(LOG_ERR,
++       		"i/o error on routing socket %m - disabling");
++       	remove_asyncio_reader(reader);
++       	delete_asyncio_reader(reader);
++       }
+ 		return;
+ 	}
+ 

src/ntp/patch/series

@@ -0,0 +1 @@
+0001-donot-disable-reader-kernel-enobufs.patch