[build/onie installer] Install grub for SONiC post migration from another NOS (#949)

* Install grub for SONiC post migration from another NOS

* Install grub from bundled debian package instead of using ONIE's. Address review comments

Author: padmanarayana

build_debian.sh

@@ -63,6 +63,7 @@ if [[ -d $FILESYSTEM_ROOT ]]; then
 fi
 mkdir -p $FILESYSTEM_ROOT
 mkdir -p $FILESYSTEM_ROOT/$PLATFORM_DIR
+mkdir -p $FILESYSTEM_ROOT/$PLATFORM_DIR/x86_64-grub
 touch $FILESYSTEM_ROOT/$PLATFORM_DIR/firsttime
 
 ## Build a basic Debian system by debootstrap
@@ -205,7 +206,13 @@ sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y in
     curl                    \
     kexec-tools             \
     less                    \
-    unzip
+    unzip                   \
+    gdisk
+
+sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y download \
+    grub-pc-bin
+
+sudo mv $FILESYSTEM_ROOT/grub-pc-bin*.deb $FILESYSTEM_ROOT/$PLATFORM_DIR/x86_64-grub
 
 ## Disable kexec supported reboot which was installed by default
 sudo sed -i 's/LOAD_KEXEC=true/LOAD_KEXEC=false/' $FILESYSTEM_ROOT/etc/default/kexec

files/image_config/platform/rc.local

@@ -29,13 +29,34 @@ if [ ! -e /host/machine.conf ]; then
         done
     fi
 
+    migration="TRUE"
     umount /mnt/onie-boot
 fi
 
 . /host/machine.conf
 
 echo "install platform dependent packages at the first boot time"
 
+firsttime_exit()
+{
+    rm /host/image-$sonic_version/platform/firsttime
+    exit 0
+}
+
+# Given a string of tuples of the form field=value, extract the value for a field
+# In : $string, $field
+# Out: $value
+value_extract()
+{
+set -- $string
+for x in "$@"; do
+    case "$x" in
+        $field=*)
+            value="${x#$field=}"
+    esac
+done
+}
+
 sonic_version=$(cat /etc/sonic/sonic_version.yml | grep build_version | cut -f2 -d" ")
 
 if [ -f /host/image-$sonic_version/platform/firsttime ]; then
@@ -46,8 +67,7 @@ if [ -f /host/image-$sonic_version/platform/firsttime ]; then
         platform=$onie_platform
     else
         echo "Unknown sonic platform"
-        rm /host/image-$sonic_version/platform/firsttime
-        exit 0
+        firsttime_exit
     fi
 
     # Try to take old configuration saved during installation
@@ -76,6 +96,88 @@ if [ -f /host/image-$sonic_version/platform/firsttime ]; then
         dpkg -i /host/image-$sonic_version/platform/$platform/*.deb
     fi
 
+    # If the unit booted into SONiC from another NOS's grub,
+    # we now install a grub for SONiC.
+    if [ -n "$onie_platform" ] && [ -n "$migration" ]; then
+
+        grub_bin=$(ls /host/image-$sonic_version/platform/x86_64-grub/grub-pc-bin*.deb 2> /dev/null)
+        if [ -z "$grub_bin" ]; then
+            echo "Unable to locate grub package !" >> /etc/migration.log
+            firsttime_exit
+        fi
+
+        dpkg -i $grub_bin > /dev/null 2>&1
+        if [ $? != 0 ]; then
+            echo "Unable to install grub package !" >> /etc/migration.log
+            firsttime_exit
+        fi
+
+        # Determine the block device to install grub
+        sonic_dev=$(blkid | grep SONiC-OS | head -n 1 | awk '{print $1}' |  sed -e 's/[0-9]:.*$//')
+        if [ -z "$sonic_dev" ]; then
+            echo "Unable to determine sonic partition !" >> /etc/migration.log
+            firsttime_exit
+        fi
+
+        grub-install --boot-directory=/host --recheck $sonic_dev 2>/dev/null
+        if [ $? != 0 ]; then
+            echo "grub install failed !" >> /etc/migration.log
+            firsttime_exit
+        fi
+
+        # The SONiC "raw" build mode has already generated a proto grub.cfg
+        # as part of the migration. Platform specific constants need to be
+        # retrieved from installer.conf (if present) and assigned.
+        . /usr/share/sonic/device/$platform/installer.conf
+
+        if [ ! -z "$CONSOLE_PORT" ]; then
+            field="\-\-port"
+            string=$(grep $field /host/grub.cfg)
+            value_extract $string $field
+            console_port=$value
+            if [ ! -z "$console_port" ] && [ "$console_port" != "$CONSOLE_PORT" ]; then
+                sed -i -e "s/\-\-port=$console_port/\-\-port=$CONSOLE_PORT/g" /host/grub.cfg
+            fi
+            echo "grub.cfg console port=$console_port & installer.conf CONSOLE_PORT=$CONSOLE_PORT" >> /etc/migration.log
+        fi
+
+        if [ ! -z "$CONSOLE_DEV" ]; then
+            field="console"
+            string=$(grep $field /host/grub.cfg)
+            value_extract $string $field
+            console_dev_name=$(echo $value | sed -e "s/^.*=//" -e "s/,.*//")
+            console_dev="${console_dev_name#ttyS}"
+            if [ "$console_dev" != "$CONSOLE_DEV" ]; then
+                sed -i -e "s/console=ttyS$console_dev/console=ttyS$CONSOLE_DEV/g" /host/grub.cfg
+            fi
+            echo "grub.cfg console dev=$console_dev & installer.conf CONSOLE_DEV=$CONSOLE_DEV" >> /etc/migration.log
+        fi
+
+        if [ ! -z "$VAR_LOG_SIZE" ]; then
+            field="var_log_size"
+            string=$(grep $field /host/grub.cfg)
+            value_extract $string $field
+            var_log_size=$value
+            if [ ! -z "$var_log_size" ] && [ "$var_log_size" != "$VAR_LOG_SIZE" ]; then
+                sed -i -e "s/var_log_size=$var_log_size/var_log_size=$VAR_LOG_SIZE/g" /host/grub.cfg
+            fi
+            echo "grub.cfg var_log_size=$var_log_size & installer.conf VAR_LOG_SIZE=$VAR_LOG_SIZE" >> /etc/migration.log
+        fi
+
+        # Set the root based on the label
+        sonic_root=$(blkid | grep SONiC-OS | head -n 1 | awk '{print $1}' |  sed -e 's/:.*$//')
+        sonic_root=$(echo "$sonic_root" | sed 's/\//\\\//g')
+        sed -i -e "s/%%SONIC_ROOT%%/$sonic_root/g" /host/grub.cfg
+
+        # Add the Diag and ONIE entries
+        mount $onie_dev /mnt/onie-boot
+        . /mnt/onie-boot/onie/grub.d/50_onie_grub >> /host/grub.cfg
+        umount /mnt/onie-boot
+
+        # Initialize the SONiC's grub config
+        mv /host/grub.cfg /host/grub/grub.cfg
+    fi
+
     rm /host/image-$sonic_version/platform/firsttime
 fi
 

installer/x86_64/install.sh

@@ -423,7 +423,7 @@ else
     demo_mnt="build_raw_image_mnt"
     demo_dev=$cur_wd/"%%OUTPUT_RAW_IMAGE%%"
 
-    mkfs.ext4 $demo_dev
+    mkfs.ext4 -L $demo_volume_label $demo_dev
 
     echo "Mounting $demo_dev on $demo_mnt..."
     mkdir $demo_mnt
@@ -535,6 +535,12 @@ if [ "$install_env" = "sonic" ]; then
     onie_menuentry=$(cat /host/grub/grub.cfg | sed "/menuentry ONIE/,/}/!d")
 fi
 
+if [ "$install_env" = "build" ]; then
+    grub_cfg_root=%%SONIC_ROOT%%
+else
+    grub_cfg_root=$demo_dev
+fi
+
 cat <<EOF >> $grub_cfg
 menuentry '$demo_grub_entry' {
         search --no-floppy --label --set=root $demo_volume_label
@@ -543,7 +549,7 @@ menuentry '$demo_grub_entry' {
         if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
         insmod part_msdos
         insmod ext2
-        linux   /$image_dir/boot/vmlinuz-3.16.0-4-amd64 root=$demo_dev rw $GRUB_CMDLINE_LINUX  \
+        linux   /$image_dir/boot/vmlinuz-3.16.0-4-amd64 root=$grub_cfg_root rw $GRUB_CMDLINE_LINUX  \
                 loop=$image_dir/$FILESYSTEM_SQUASHFS loopfstype=squashfs                       \
                 apparmor=1 security=apparmor varlog_size=$VAR_LOG_SIZE $ONIE_PLATFORM_EXTRA_CMDLINE_LINUX
         echo    'Loading $demo_volume_label $demo_type initial ramdisk ...'
@@ -564,6 +570,7 @@ EOF
 fi
 
 if [ "$install_env" = "build" ]; then
+    cp $grub_cfg $demo_mnt/grub.cfg
     umount $demo_mnt
 else
     cp $grub_cfg $onie_initrd_tmp/$demo_mnt/grub/grub.cfg