Adding scripts to align boot and rootfs partition

The mender boot slot values are not in sync with nvbootctrl slot values. The values are updated correctly in the mender_boot_part variable, but the nvbootctrl fails to sync up with the latest boot partition to use on the next reboot after a mender update sometimes.
This commit would rectify the issue by identifying the mismatch and giving a Warning and dumping all the data for debug.
At the same time it would set the active boot partition based on the value in mender_boot_partition, so that there is no mismatch going forward.
This script would run after every mender update and will run as a one shot service.

meta-mender-tegra/recipes-mender/mender-client/files/mender

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+echo "Starting mender wrapper"
+
+echo $@ | grep 'install\|-install' > /dev/null
+if [ $? -eq 0 ]; then
+    /etc/mender/verify-boot-rootfs-slot-alignment-uboot || exit 1
+fi
+
+mender_override $@
+
+rc=$?
+if [ $rc -eq 0 ]; then
+    echo $@ | grep 'install\|-install' > /dev/null
+    if [ $? -eq 0 ]; then
+        touch /var/lib/mender/mender-install-success
+    fi
+fi
+

meta-mender-tegra/recipes-mender/mender-client/files/mender-client-commit.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=Automatic Mender Commit Service
+After=mender-client.service 
+
+[Service]
+ExecStart=/etc/mender/mender-client-commit.sh
+Type=oneshot
+StandardOutput=journal+console
+
+[Install]
+WantedBy=multi-user.target

meta-mender-tegra/recipes-mender/mender-client/files/mender-client-commit.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+/etc/mender/verify-boot-rootfs-slot-alignment-uboot || exit 0
+
+if [ -f /var/lib/mender/mender-install-success ]; then
+    /usr/bin/mender -commit
+    rc=$?
+    if [ $rc -eq 0 ]; then
+        rm /var/lib/mender/mender-install-success
+    fi
+fi

meta-mender-tegra/recipes-mender/mender-client/files/verify-boot-rootfs-slot-alignment-uboot

@@ -0,0 +1,56 @@
+#!/bin/sh
+
+echo "Verify if nvbootctrl slot matches rootfs partition"
+
+# This variable will be populated with the partition number to boot from
+mender_boot_partition=`fw_printenv -n mender_boot_part`
+devnam=`grep -h "RootfsPart" /etc/mender/mender.conf /var/lib/mender/mender.conf | grep ${mender_boot_partition} | tr -d '" ' | sed "s/RootfsPart//" | cut -f1 -d":"`
+
+# Fetching corresponding boot slot
+if [ $devnam = A ]; then
+    mender_boot_slot=0
+elif [ $devnam = B ]; then
+    mender_boot_slot=1
+fi
+
+# Have default value here in case priorities are equal
+nvbootctrl_slot=`nvbootctrl get-current-slot`
+priority_slot0=`nvbootctrl dump-slots-info | grep 'priority' | awk 'FNR == 1 {print $4}' | cut -d ',' -f 1`
+priority_slot1=`nvbootctrl dump-slots-info | grep 'priority' | awk 'FNR == 2 {print $4}' | cut -d ',' -f 1`
+
+# Determining the boot slot that would be used after reboot
+# Whichever boot slot would have the higher priority, that would be used in the next boot.
+if [ $priority_slot1 -gt $priority_slot0 ]; then
+    nvbootctrl_slot=1
+elif [ $priority_slot0 -gt $priority_slot1 ]; then
+    nvbootctrl_slot=0
+fi
+
+# Checking if the mender and nvbootctrl align to the same boot slots
+# if not set nvbootctrl active boot slot sane as mender_boot_slot
+# Dumping Warning prints to stderr since mender state scripts logs only read stderr.
+if [ $mender_boot_slot -ne $nvbootctrl_slot ]; then
+    echo "********************* WARNING!!!!! *********************"
+    echo "Partition mismatch for boot and rootfs on reboot"
+    echo "mender boot slot: ${mender_boot_slot}"
+    echo "nvbootctrl slot: ${nvbootctrl_slot}"
+    echo "Setting the current nvbootctrl slot manually to the value of mender boot slot"
+    nvbootctrl set-active-boot-slot ${mender_boot_slot}
+
+    echo "********************* WARNING!!!!! *********************"
+    echo "Dumping partition information"
+    echo `nvbootctrl get-current-slot`
+    echo `nvbootctrl dump-slots-info`
+    echo `fw_printenv -n mender_boot_part`
+
+    echo "********************* WARNING!!!!! *********************"
+    echo "Disabling mender-client systemd service to prevent any more updates"
+    systemctl stop mender-client
+
+    echo "Reboot the device to set the active slot before proceeding for a mender -install or mender -commit"
+    exit 1
+else
+    echo "Verified"
+fi
+
+exit 0

meta-mender-tegra/recipes-mender/mender-client/mender-client_%.bbappend

@@ -1 +1,25 @@
 RDEPENDS_${PN}_append_tegra = "${@' tegra-bup-payload libubootenv-fake' if d.getVar('PREFERRED_PROVIDER_virtual/bootloader').startswith('cboot') else ''}"
+
+FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
+SRC_URI_append_mender-uboot = " \
+    file://mender \
+    file://mender-client-commit.service \
+    file://mender-client-commit.sh \
+    file://verify-boot-rootfs-slot-alignment-uboot \
+"
+
+FILES_${PN}_append_mender-uboot = " ${systemd_system_unitdir}/mender-client-commit.service"
+FILES_${PN}_append_mender-uboot = " ${sysconfdir}/mender/mender-client-commit.sh"
+FILES_${PN}_append_mender-uboot = " ${bindir}/mender"
+FILES_${PN}_append_mender-uboot = " ${sysconfdir}/mender/verify-boot-rootfs-slot-alignment-uboot"
+
+SYSTEMD_SERVICE_${PN}_append_mender-uboot = " mender-client-commit.service"
+
+do_install_append_mender-uboot() {
+    mv ${D}${bindir}/mender ${D}${bindir}/mender_override
+    install -m 0755 ${WORKDIR}/mender ${D}${bindir}/mender
+    install -d ${D}${sysconfdir}/mender/scripts
+    install -m 0755 ${WORKDIR}/mender-client-commit.sh ${D}${sysconfdir}/mender/mender-client-commit.sh 
+    install -m 0644 ${WORKDIR}/mender-client-commit.service ${D}${systemd_system_unitdir}/mender-client-commit.service
+    install -m 0755 ${WORKDIR}/verify-boot-rootfs-slot-alignment-uboot ${D}${sysconfdir}/mender/verify-boot-rootfs-slot-alignment-uboot
+}