diff options
Diffstat (limited to 'meta/recipes-core/initrdscripts/files/init-live.sh')
| -rw-r--r-- | meta/recipes-core/initrdscripts/files/init-live.sh | 136 |
1 files changed, 98 insertions, 38 deletions
diff --git a/meta/recipes-core/initrdscripts/files/init-live.sh b/meta/recipes-core/initrdscripts/files/init-live.sh index 4bd1b52c11..441b41c9d6 100644 --- a/meta/recipes-core/initrdscripts/files/init-live.sh +++ b/meta/recipes-core/initrdscripts/files/init-live.sh @@ -2,17 +2,18 @@ PATH=/sbin:/bin:/usr/sbin:/usr/bin -ROOT_MOUNT="/rootfs/" +ROOT_MOUNT="/rootfs" ROOT_IMAGE="rootfs.img" MOUNT="/bin/mount" UMOUNT="/bin/umount" ISOLINUX="" -UNIONFS="no" + +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 /sbin/systemd/systemd-udevd /lib/systemd/systemd-udevd" + OPTIONS="/sbin/udev/udevd /sbin/udevd /lib/udev/udevd /lib/systemd/systemd-udevd" for o in $OPTIONS; do if [ -x "$o" ]; then @@ -50,6 +51,8 @@ read_args() { case $arg in root=*) ROOT_DEVICE=$optarg ;; + rootimage=*) + ROOT_IMAGE=$optarg ;; rootfstype=*) modprobe $optarg 2> /dev/null ;; LABEL=*) @@ -75,18 +78,31 @@ read_args() { } boot_live_root() { - killall udevd 2>/dev/null + # Watches the udev event queue, and exits if all current events are handled + udevadm settle --timeout=3 --quiet + # Kills the current udev running processes, which survived after + # device node creation events were handled, to avoid unexpected behavior + killall -9 "${_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 ${ROOT_MOUNT}/dev - # Move /media/$i over to the real root filesystem - mount -n --move /media/$i ${ROOT_MOUNT}/media/realroot cd $ROOT_MOUNT - exec switch_root -c /dev/console $ROOT_MOUNT /sbin/init + + # busybox switch_root supports -c option + exec switch_root -c /dev/console $ROOT_MOUNT /sbin/init $CMDLINE || + fatal "Couldn't switch_root, dropping to shell" } fatal() { @@ -105,13 +121,15 @@ echo "Waiting for removable media..." C=0 while true do - for i in `ls /media 2>/dev/null`; do - if [ -f /media/$i/$ROOT_IMAGE ] ; then + for i in `ls /run/media 2>/dev/null`; do + if [ -f /run/media/$i/$ROOT_IMAGE ] ; then found="yes" + ROOT_DISK="$i" break - elif [ -f /media/$i/isolinux/$ROOT_IMAGE ]; then + elif [ -f /run/media/$i/isolinux/$ROOT_IMAGE ]; then found="yes" ISOLINUX="isolinux" + ROOT_DISK="$i" break fi done @@ -126,47 +144,89 @@ do echo "Mounted filesystems" mount | grep media echo "Available block devices" - ls /dev/sd* - fatal "Cannot find rootfs.img file in /media/* , dropping to a shell " + cat /proc/partitions + fatal "Cannot find $ROOT_IMAGE file in /run/media/* , dropping to a shell " fi C=$(( C + 1 )) fi sleep 1 done -case $label in - boot) - mkdir $ROOT_MOUNT - mknod /dev/loop0 b 7 0 2>/dev/null - - - if [ "$UNIONFS" = "yes" ]; then - mkdir /rootfs-tmp - - if ! $MOUNT -o rw,loop,noatime,nodiratime /media/$i/$ISOLINUX/$ROOT_IMAGE /rootfs-tmp ; then - fatal "Could not mount rootfs image" +# 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 "overlay" /proc/filesystems; then + union_fs_type="overlay" + 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 + "overlay") + 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 - mkdir /cow - mount -t tmpfs -o rw,noatime,mode=755 tmpfs /cow - mount -t unionfs -o dirs=/cow:/rootfs-tmp=ro unionfs $ROOT_MOUNT - boot_live_root + mount -t tmpfs -o rw,noatime,mode=755 tmpfs /rootfs.rw + mkdir -p /rootfs.rw/upperdir /rootfs.rw/work + mount -t overlay overlay -o "lowerdir=/rootfs.ro,upperdir=/rootfs.rw/upperdir,workdir=/rootfs.rw/work" $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 - else - if ! $MOUNT -o rw,loop,noatime,nodiratime /media/$i/$ISOLINUX/$ROOT_IMAGE $ROOT_MOUNT ; then - fatal "Could not mount rootfs image" + ;; + "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 - boot_live_root + 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 $ROOT_MOUNT/rootfs.rw fi - fi - ;; - install|install-efi) - if [ -f /media/$i/$ISOLINUX/$ROOT_IMAGE ] ; then + ;; + "") + mount -t tmpfs -o rw,noatime,mode=755 tmpfs $ROOT_MOUNT/media + ;; + esac + + # boot the image + boot_live_root +} + +if [ "$label" != "boot" -a -f $label.sh ] ; then + if [ -f /run/media/$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" - ;; -esac + fatal "Target $label failed" +fi + +mount_and_boot + |