1 files changed, 235 insertions, 0 deletions

diff --git a/meta/recipes-core/initrdscripts/files/init-live.sh b/meta/recipes-core/initrdscripts/files/init-live.sh
new file mode 100644
index 0000000000..d852c5737f
--- /dev/null
+++ b/meta/recipes-core/initrdscripts/files/init-live.sh
@@ -0,0 +1,235 @@
+#!/bin/sh
+
+PATH=/sbin:/bin:/usr/sbin:/usr/bin
+
+ROOT_MOUNT="/rootfs/"
+ROOT_IMAGE="rootfs.img"
+MOUNT="/bin/mount"
+UMOUNT="/bin/umount"
+ISOLINUX=""
+
+ROOT_DISK=""
+
+# Copied from initramfs-framework. The core of this script probably should be
+# turned into initramfs-framework modules to reduce duplication.
+udev_daemon() {
+        OPTIONS="/sbin/udev/udevd /sbin/udevd /lib/udev/udevd /lib/systemd/systemd-udevd"
+
+        for o in $OPTIONS; do
+                if [ -x "$o" ]; then
+                        echo $o
+                        return 0
+                fi
+        done
+
+        return 1
+}
+
+_UDEV_DAEMON=`udev_daemon`
+
+early_setup() {
+    mkdir -p /proc
+    mkdir -p /sys
+    mount -t proc proc /proc
+    mount -t sysfs sysfs /sys
+    mount -t devtmpfs none /dev
+
+    # support modular kernel
+    modprobe isofs 2> /dev/null
+
+    mkdir -p /run
+    mkdir -p /var/run
+
+    $_UDEV_DAEMON --daemon
+    udevadm trigger --action=add
+}
+
+read_args() {
+    [ -z "$CMDLINE" ] && CMDLINE=`cat /proc/cmdline`
+    for arg in $CMDLINE; do
+        optarg=`expr "x$arg" : 'x[^=]*=\(.*\)'`
+        case $arg in
+            root=*)
+                ROOT_DEVICE=$optarg ;;
+            rootimage=*)
+                ROOT_IMAGE=$optarg ;;
+            rootfstype=*)
+                modprobe $optarg 2> /dev/null ;;
+            LABEL=*)
+                label=$optarg ;;
+            video=*)
+                video_mode=$arg ;;
+            vga=*)
+                vga_mode=$arg ;;
+            console=*)
+                if [ -z "${console_params}" ]; then
+                    console_params=$arg
+                else
+                    console_params="$console_params $arg"
+                fi ;;
+            debugshell*)
+                if [ -z "$optarg" ]; then
+                        shelltimeout=30
+                else
+                        shelltimeout=$optarg
+                fi 
+        esac
+    done
+}
+
+boot_live_root() {
+    # Watches the udev event queue, and exits if all current events are handled
+    udevadm settle --timeout=3 --quiet
+    killall "${_UDEV_DAEMON##*/}" 2>/dev/null
+
+    # Allow for identification of the real root even after boot
+    mkdir -p  ${ROOT_MOUNT}/media/realroot
+    mount -n --move "/run/media/${ROOT_DISK}" ${ROOT_MOUNT}/media/realroot
+
+    # Move the mount points of some filesystems over to
+    # the corresponding directories under the real root filesystem.
+    for dir in `awk '/\/dev.* \/run\/media/{print $2}' /proc/mounts`; do
+        mkdir -p  ${ROOT_MOUNT}/media/${dir##*/}
+        mount -n --move $dir ${ROOT_MOUNT}/media/${dir##*/}
+    done
+    mount -n --move /proc ${ROOT_MOUNT}/proc
+    mount -n --move /sys ${ROOT_MOUNT}/sys
+    mount -n --move /dev ${ROOT_MOUNT}/dev
+
+    cd $ROOT_MOUNT
+
+    # busybox switch_root supports -c option
+    exec switch_root -c /dev/console $ROOT_MOUNT /sbin/init $CMDLINE ||
+        fatal "Couldn't switch_root, dropping to shell"
+}
+
+fatal() {
+    echo $1 >$CONSOLE
+    echo >$CONSOLE
+    exec sh
+}
+
+early_setup
+
+[ -z "$CONSOLE" ] && CONSOLE="/dev/console"
+
+read_args
+
+echo "Waiting for removable media..."
+C=0
+while true
+do
+  for i in `ls /run/media 2>/dev/null`; do
+      if [ -f /run/media/$i/$ROOT_IMAGE ] ; then
+                found="yes"
+                ROOT_DISK="$i"
+                break
+          elif [ -f /run/media/$i/isolinux/$ROOT_IMAGE ]; then
+                found="yes"
+                ISOLINUX="isolinux"
+                ROOT_DISK="$i"
+                break   
+      fi
+  done
+  if [ "$found" = "yes" ]; then
+      break;
+  fi
+  # don't wait for more than $shelltimeout seconds, if it's set
+  if [ -n "$shelltimeout" ]; then
+      echo -n " " $(( $shelltimeout - $C ))
+      if [ $C -ge $shelltimeout ]; then
+           echo "..."
+           echo "Mounted filesystems"
+           mount | grep media
+           echo "Available block devices"
+           cat /proc/partitions
+           fatal "Cannot find $ROOT_IMAGE file in /run/media/* , dropping to a shell "
+      fi
+      C=$(( C + 1 ))
+  fi
+  sleep 1
+done
+
+# Try to mount the root image read-write and then boot it up.
+# This function distinguishes between a read-only image and a read-write image.
+# In the former case (typically an iso), it tries to make a union mount if possible.
+# In the latter case, the root image could be mounted and then directly booted up.
+mount_and_boot() {
+    mkdir $ROOT_MOUNT
+    mknod /dev/loop0 b 7 0 2>/dev/null
+
+    if ! mount -o rw,loop,noatime,nodiratime /run/media/$ROOT_DISK/$ISOLINUX/$ROOT_IMAGE $ROOT_MOUNT ; then
+        fatal "Could not mount rootfs image"
+    fi
+
+    if touch $ROOT_MOUNT/bin 2>/dev/null; then
+        # The root image is read-write, directly boot it up.
+        boot_live_root
+    fi
+
+    # determine which unification filesystem to use
+    union_fs_type=""
+    if grep -q -w "overlayfs" /proc/filesystems; then
+        union_fs_type="overlayfs"
+    elif grep -q -w "aufs" /proc/filesystems; then
+        union_fs_type="aufs"
+    else
+        union_fs_type=""
+    fi
+
+    # make a union mount if possible
+    case $union_fs_type in
+        "overlayfs")
+            mkdir -p /rootfs.ro /rootfs.rw
+            if ! mount -n --move $ROOT_MOUNT /rootfs.ro; then
+                rm -rf /rootfs.ro /rootfs.rw
+                fatal "Could not move rootfs mount point"
+            else
+                mount -t tmpfs -o rw,noatime,mode=755 tmpfs /rootfs.rw
+                mount -t overlayfs -o "lowerdir=/rootfs.ro,upperdir=/rootfs.rw" overlayfs $ROOT_MOUNT
+                mkdir -p $ROOT_MOUNT/rootfs.ro $ROOT_MOUNT/rootfs.rw
+                mount --move /rootfs.ro $ROOT_MOUNT/rootfs.ro
+                mount --move /rootfs.rw $ROOT_MOUNT/rootfs.rw
+            fi
+            ;;
+        "aufs")
+            mkdir -p /rootfs.ro /rootfs.rw
+            if ! mount -n --move $ROOT_MOUNT /rootfs.ro; then
+                rm -rf /rootfs.ro /rootfs.rw
+                fatal "Could not move rootfs mount point"
+            else
+                mount -t tmpfs -o rw,noatime,mode=755 tmpfs /rootfs.rw
+                mount -t aufs -o "dirs=/rootfs.rw=rw:/rootfs.ro=ro" aufs $ROOT_MOUNT
+                mkdir -p $ROOT_MOUNT/rootfs.ro $ROOT_MOUNT/rootfs.rw
+                mount --move /rootfs.ro $ROOT_MOUNT/rootfs.ro
+                mount --move /rootfs.rw $ROOT_MOUNT/rootfs.rw
+            fi
+            ;;
+        "")
+            mount -t tmpfs -o rw,noatime,mode=755 tmpfs $ROOT_MOUNT/media
+            ;;
+    esac
+
+    # boot the image
+    boot_live_root
+}
+
+case $label in
+    boot)
+        mount_and_boot
+        ;;
+    install|install-efi)
+        if [ -f /run/media/$i/$ISOLINUX/$ROOT_IMAGE ] ; then
+            ./$label.sh $i/$ISOLINUX $ROOT_IMAGE $video_mode $vga_mode $console_params
+        else
+            fatal "Could not find $label script"
+        fi
+
+        # If we're getting here, we failed...
+        fatal "Installation image failed"
+        ;;
+    *)
+        # Not sure what boot label is provided.  Try to boot to avoid locking up.
+        mount_and_boot
+        ;;
+esac