init: clean up

Signed-off-by: Lans Zhang <jia.zhang@windriver.com>

meta/recipes-core/initrdscripts/files/init

@@ -1,89 +1,52 @@
 #!/bin/sh
 
 PATH="/sbin:/bin:/usr/sbin:/usr/bin"
+ROOTFS_MOUNT="/rootfs"
+INIT="/sbin/init"
 
-ROOT_MOUNT="/rootfs"
+mkdir /proc /sys /run
-MOUNT="/bin/mount"
+mount -t proc none /proc
-UMOUNT="/bin/umount"
+mount -t sysfs none /sys
+mount -t devtmpfs none /dev
+mount -t tmpfs none /run
 
-# Copied from initramfs-framework. The core of this script probably should be
+cmdline="`cat /proc/cmdline`"
-# turned into initramfs-framework modules to reduce duplication.
+for arg in $cmdline; do
-udev_daemon() {
+    optarg=`expr "x$arg" : 'x[^=]*=\(.*\)'`
-    PROGS="/sbin/udev/udevd /sbin/udevd /lib/udev/udevd /lib/systemd/systemd-udevd"
 
-    for o in $PROGS; do
+    case "$arg" in
-        if [ -x "$o" ]; then
+    root=*)
-            echo "$o"
+        ROOTFS_DEV="$optarg"
-            return 0
+        ;;
-        fi
+    init=*)
-    done
+        INIT="$optarg"
+        ;;
+    esac
+done
 
-    return 1
+[ -z "$ROOTFS_DEV" ] && {
+    echo "exiting on missing the kernel parameter root= ..."
+    exit 1
 }
 
-_UDEV_DAEMON="`udev_daemon`"
+mkdir -p "$ROOTFS_MOUNT"
-
-early_setup() {
-    mount -t proc proc /proc
-    mount -t sysfs sysfs /sys
-    mount -t devtmpfs none /dev
-    mount -t tmpfs none /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"
-		;;
-            rootdelay=*)
-                ROOT_DELAY="$optarg"
-		;;
-            init=*)
-                INIT="$optarg"
-		;;
-        esac
-    done
-}
-
-fatal() {
-    echo $1 >$CONSOLE
-    echo >$CONSOLE
-    exec sh
-}
-
-early_setup
-
-read_args
-
-[ -z "$CONSOLE" ] && CONSOLE="/dev/console"
-[ -z "$INIT" ] && INIT="/sbin/init"
-
-udevadm settle --timeout=3
-killall "${_UDEV_DAEMON##*/}" 2>/dev/null
-
-mkdir -p "$ROOT_MOUNT"
 
 try_to_mount_rootfs() {
     local mount_flags="rw,noatime,iversion"
 
-    mount -o "$mount_flags" "$ROOT_DEVICE" "$ROOT_MOUNT" \
+    mount -o "$mount_flags" "$ROOTFS_DEV" "$ROOTFS_MOUNT" \
         2>/dev/null && return 0
 
     [ -x /init.cryptfs ] &&
-        /init.cryptfs "$ROOT_MOUNT" "$ROOT_DEVICE" \
+        /init.cryptfs "$ROOTFS_MOUNT" "$ROOTFS_DEV" \
             "$mount_flags" OVERCROOTFS && return 0
 
     return 1
 }
 
-echo "Waiting for root device to be ready..."
+echo "Waiting for root device to be ready ..."
-while [ 1 ] ; do
+
+while [ 1 ]; do
     try_to_mount_rootfs && break
     sleep 0.1
 done
@@ -91,24 +54,18 @@ done
 # Move the mount points of some filesystems over to
 # the corresponding directories under the real root filesystem.
 for dir in `cat /proc/mounts | grep -v rootfs | awk '{ print $2 }'` ; do
-    mkdir -p  $ROOT_MOUNT/${dir##*/}
+    mkdir -p "$ROOTFS_MOUNT"/${dir##*/}
-    mount -nv --move "$dir" $ROOT_MOUNT/${dir##*/}
+    mount -nv --move "$dir" "$ROOTFS_MOUNT"/${dir##*/}
 done
 
-cd "$ROOT_MOUNT"
+cd "$ROOTFS_MOUNT"
-
-# If we pass args to bash, it will assume they are text files
-# to source and run.
-if [ "$INIT" == "/bin/bash" ] || [ "$INIT" == "/bin/sh" ]; then
-    CMDLINE=""
-fi
 
 # !!! The Big Fat Warnings !!!
 #
 # The IMA policy may enforce appraising the executable and verifying the
 # signature stored in xattr. However, ramfs doesn't support xattr, and all
 # other initializations must *NOT* be placed after IMA initialization!
-[ -x /init.ima ] && /init.ima "$ROOT_MOUNT" && {
+[ -x /init.ima ] && /init.ima "$ROOTFS_MOUNT" && {
     # switch_root is an exception. We call it in the real rootfs and it
     # should be already signed properly.
     switch_root="usr/sbin/switch_root.static"
@@ -116,5 +73,8 @@ fi
     switch_root="switch_root"
 }
 
-exec "$switch_root" "$ROOT_MOUNT" "$INIT" "$CMDLINE" ||
+exec "$switch_root" "$ROOTFS_MOUNT" "$INIT" || {
-    fatal "Couldn't switch_root, dropping to shell"
+    "$ROOTFS_MOUNT/bin/echo.coreutils" "Couldn't switch to the real rootfs"
+    # Cause kernel panic.
+    exit 2
+}