diff options
author | ToshikazuOhiwa <toshikazu_ohiwa@mail.toyota.co.jp> | 2020-03-30 09:24:26 +0900 |
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committer | ToshikazuOhiwa <toshikazu_ohiwa@mail.toyota.co.jp> | 2020-03-30 09:24:26 +0900 |
commit | 5b80bfd7bffd4c20d80b7c70a7130529e9a755dd (patch) | |
tree | b4bb18dcd1487dbf1ea8127e5671b7bb2eded033 /external/poky/meta/recipes-core/initrdscripts/files/init-live.sh | |
parent | 706ad73eb02caf8532deaf5d38995bd258725cb8 (diff) |
agl-basesystem
Diffstat (limited to 'external/poky/meta/recipes-core/initrdscripts/files/init-live.sh')
-rw-r--r-- | external/poky/meta/recipes-core/initrdscripts/files/init-live.sh | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/external/poky/meta/recipes-core/initrdscripts/files/init-live.sh b/external/poky/meta/recipes-core/initrdscripts/files/init-live.sh new file mode 100644 index 00000000..65183d7e --- /dev/null +++ b/external/poky/meta/recipes-core/initrdscripts/files/init-live.sh @@ -0,0 +1,239 @@ +#!/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=$optarg + fi + esac + done +} + +boot_live_root() { + # Watches the udev event queue, and exits if all current events are handled + udevadm settle --timeout=3 --quiet + # Kills the current udev running processes, which survived after + # device node creation events were handled, to avoid unexpected behavior + killall -9 "${_UDEV_DAEMON##*/}" 2>/dev/null + + # Don't run systemd-update-done on systemd-based live systems + # because it triggers a slow rebuild of ldconfig caches. + touch ${ROOT_MOUNT}/etc/.updated ${ROOT_MOUNT}/var/.updated + + # 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 + # Parse any OCT or HEX encoded chars such as spaces + # in the mount points to actual ASCII chars + dir=`printf $dir` + mkdir -p "${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 "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 + 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 + ;; + "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 $ROOT_MOUNT/media + ;; + esac + + # boot the image + boot_live_root +} + +if [ "$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 "Target $label failed" +fi + +mount_and_boot + |