[oe] [PATCH 07/15] meta-installer: add initramfs-live-boot bbappend
Hongxu Jia
hongxu.jia at windriver.com
Thu Nov 23 12:09:07 UTC 2017
Customize init-live.sh to override the one in oe-core
- Add option to enter a debug shell in initrd
- Add option to run anaconda installer from initrd.
(required by PXE install)
- Remove -c while invoking switch_root which
is not supported by util-linux
The bbappend works only if DISTRO = "anaconda".
Signed-off-by: Hongxu Jia <hongxu.jia at windriver.com>
---
.../initrdscripts/files/init-live.sh | 249 +++++++++++++++++++++
.../initrdscripts/initramfs-live-boot_1.0.bbappend | 5 +
2 files changed, 254 insertions(+)
create mode 100644 meta-installer/recipes-installer/initrdscripts/files/init-live.sh
create mode 100644 meta-installer/recipes-installer/initrdscripts/initramfs-live-boot_1.0.bbappend
diff --git a/meta-installer/recipes-installer/initrdscripts/files/init-live.sh b/meta-installer/recipes-installer/initrdscripts/files/init-live.sh
new file mode 100644
index 0000000..965375b
--- /dev/null
+++ b/meta-installer/recipes-installer/initrdscripts/files/init-live.sh
@@ -0,0 +1,249 @@
+#!/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 $arg"
+ fi ;;
+ shelltimeout*)
+ if [ -z "$optarg" ]; then
+ shelltimeout=30
+ else
+ shelltimeout=$optarg
+ fi ;;
+ debugshell)
+ debugshell=y
+ esac
+ done
+}
+
+boot_live_root() {
+ # Watches the udev event queue, and exits if all current events are handled
+ udevadm settle --timeout=3
+ killall "${_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
+
+ # Umount other media for anaconda
+ for dir in `awk '/\/dev.* \/run\/media/{print $2}' /proc/mounts`; do
+ umount $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
+
+ exec switch_root $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
+
+if test x$debugshell = xy ; then
+ echo "Entering debug shell..."
+ exec /bin/sh
+fi
+
+case $label in
+ initrd-install)
+ # Watches the udev event queue, and exits if all current events are handled
+ udevadm settle --timeout=3
+ killall "${_UDEV_DAEMON##*/}" 2>/dev/null
+ for dir in `awk '/\/dev.* \/run\/media/{print $2}' /proc/mounts`; do
+ umount $dir
+ done
+ echo "" > /etc/udev/scripts/mount.sh
+ echo "init_bin /sbin/init"
+ [ -x /sbin/init ] && exec /sbin/init
+ ;;
+esac
+
+
+echo "Waiting for removable media..."
+C=0
+while true
+do
+ for i in `ls /run/media 2>/dev/null`; do
+ if [ -f /run/media/$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 $label failed"
+fi
+
+mount_and_boot
+
diff --git a/meta-installer/recipes-installer/initrdscripts/initramfs-live-boot_1.0.bbappend b/meta-installer/recipes-installer/initrdscripts/initramfs-live-boot_1.0.bbappend
new file mode 100644
index 0000000..4a644ad
--- /dev/null
+++ b/meta-installer/recipes-installer/initrdscripts/initramfs-live-boot_1.0.bbappend
@@ -0,0 +1,5 @@
+FILESEXTRAPATHS_append_anaconda := ":${THISDIR}/files"
+
+SRC_URI_append_anaconda = " \
+ file://init-live.sh \
+"
--
2.8.1
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