Merge pull request #1254 from joshwget/preserve-kernel-args

Preserve custom kernel arguments when upgrading

cmd/control/install.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"strings"
 
 	log "github.com/Sirupsen/logrus"
 
@@ -45,6 +46,10 @@ var installCommand = cli.Command{
 			Name:  "no-reboot",
 			Usage: "do not reboot after install",
 		},
+		cli.StringFlag{
+			Name:  "append, a",
+			Usage: "append additional kernel parameters",
+		},
 	},
 }
 
@@ -80,17 +85,18 @@ func installAction(c *cli.Context) error {
 		cloudConfig = uc
 	}
 
+	append := strings.TrimSpace(c.String("append"))
 	force := c.Bool("force")
 	reboot := !c.Bool("no-reboot")
 
-	if err := runInstall(image, installType, cloudConfig, device, force, reboot); err != nil {
+	if err := runInstall(image, installType, cloudConfig, device, append, force, reboot); err != nil {
 		log.WithFields(log.Fields{"err": err}).Fatal("Failed to run install")
 	}
 
 	return nil
 }
 
-func runInstall(image, installType, cloudConfig, device string, force, reboot bool) error {
+func runInstall(image, installType, cloudConfig, device, append string, force, reboot bool) error {
 	in := bufio.NewReader(os.Stdin)
 
 	fmt.Printf("Installing from %s\n", image)
@@ -110,7 +116,7 @@ func runInstall(image, installType, cloudConfig, device string, force, reboot bo
 		}
 	}
 	cmd := exec.Command("system-docker", "run", "--net=host", "--privileged", "--volumes-from=user-volumes", image,
-		"-d", device, "-t", installType, "-c", cloudConfig)
+		"-d", device, "-t", installType, "-c", cloudConfig, "-a", append)
 	cmd.Stdout, cmd.Stderr = os.Stdout, os.Stderr
 	if err := cmd.Run(); err != nil {
 		return err

cmd/control/os.go

@@ -58,7 +58,7 @@ func osSubcommands() []cli.Command {
 				},
 				cli.StringFlag{
 					Name:  "append",
-					Usage: "kernel args to append by kexec",
+					Usage: "append additional kernel parameters",
 				},
 				cli.BoolFlag{
 					Name:  "upgrade-console",
@@ -187,12 +187,12 @@ func startUpgradeContainer(image string, stage, force, reboot, kexec bool, upgra
 
 	if kexec {
 		command = append(command, "-k")
+	}
 
 	kernelArgs = strings.TrimSpace(kernelArgs)
 	if kernelArgs != "" {
 		command = append(command, "-a", kernelArgs)
 	}
-	}
 
 	if upgradeConsole {
 		if err := config.Set("rancher.force_console_rebuild", true); err != nil {

scripts/installer/lay-down-os

@@ -30,6 +30,7 @@ BASE_DIR="/mnt/new_img"
 # TODO: Change this to a number so that users can specify.
 # Will need to make it so that our builds and packer APIs remain consistent.
 PARTITION=${PARTITION:=${DEVICE}1}
+KERNEL_ARGS="rancher.state.dev=LABEL=RANCHER_STATE rancher.state.wait console=${CONSOLE}"
 
 device_defined()
 {
@@ -85,7 +86,7 @@ set timeout="1"
 
 menuentry "RancherOS-current" {
   set root=(hd0,msdos1)
-  linux /boot/vmlinuz-${VERSION}-rancheros ${append_line} rancher.state.dev=LABEL=RANCHER_STATE rancher.state.wait console=${CONSOLE}
+  linux /boot/vmlinuz-${VERSION}-rancheros ${KERNEL_ARGS} ${append_line}
   initrd /boot/initrd-${VERSION}-rancheros
 }
 
@@ -96,7 +97,7 @@ if [ ! -z ${ROLLBACK_VERSION} ]; then
 cat >>${grub_cfg} <<EOF
 menuentry "RancherOS-rollback" {
   set root=(hd0,msdos1)
-  linux /boot/vmlinuz-${ROLLBACK_VERSION}-rancheros ${append_line} rancher.state.dev=LABEL=RANCHER_STATE rancher.state.wait console=${CONSOLE}
+  linux /boot/vmlinuz-${ROLLBACK_VERSION}-rancheros ${KERNEL_ARGS} ${append_line}
   initrd /boot/initrd-${ROLLBACK_VERSION}-rancheros
 }
 EOF
@@ -123,7 +124,7 @@ hiddenmenu
 
 title RancherOS ${VERSION}-(current)
 root (hd0)
-kernel /boot/vmlinuz-${VERSION}-rancheros ${append_line} rancher.state.dev=LABEL=RANCHER_STATE rancher.state.wait console=${CONSOLE}
+kernel /boot/vmlinuz-${VERSION}-rancheros ${KERNEL_ARGS} ${append_line}
 initrd /boot/initrd-${VERSION}-rancheros
 
 EOF
@@ -133,7 +134,7 @@ if [ ! -z ${ROLLBACK_VERSION} ]; then
 cat >> ${grub_file}<<EOF
 title RancherOS ${ROLLBACK_VERSION}-(rollback)
 root (hd0)
-kernel /boot/vmlinuz-${ROLLBACK_VERSION}-rancheros ${append_line} rancher.state.dev=LABEL=RANCHER_STATE rancher.state.wait console=${CONSOLE}
+kernel /boot/vmlinuz-${ROLLBACK_VERSION}-rancheros ${KERNEL_ARGS} ${append_line}
 initrd /boot/initrd-${ROLLBACK_VERSION}-rancheros
 EOF
 fi
@@ -146,7 +147,6 @@ format_and_mount()
     create_boot_dirs
 }
 
-KERNEL_ARGS=${KERNEL_ARGS:-""}
 if [ -n ${ENV} ]; then
     case ${ENV} in
         "generic")
@@ -190,8 +190,16 @@ if [ -n ${ENV} ]; then
     esac
 fi
 
-grub2_config "${KERNEL_ARGS}"
+if [ -e ${BASE_DIR}/boot/append ]; then
-pvgrub_config "${KERNEL_ARGS}"
+    PRESERVED_APPEND=$(cat ${BASE_DIR}/boot/append)
+fi
+if [ "${APPEND}" = "" ]; then
+    APPEND="${PRESERVED_APPEND}"
+fi
+echo "${APPEND}" > ${BASE_DIR}/boot/append
+
+grub2_config "${APPEND}"
+pvgrub_config "${APPEND}"
 install_rancher
 
 seusers=${BASE_DIR}/etc/selinux/ros/seusers
@@ -204,8 +212,5 @@ if [ -f "${failsafe_context}" ]; then
 fi
 
 if [ "$KEXEC" = "y" ]; then
-    if [ "$APPEND" = "" ]; then
+    kexec -l ${DIST}/vmlinuz --initrd=${DIST}/initrd --append="${KERNEL_ARGS} ${APPEND}" -f
-        APPEND=$(cat /proc/cmdline)
-    fi
-    kexec -l ${DIST}/vmlinuz --initrd=${DIST}/initrd --append="$APPEND" -f
 fi