initramfs: support new-partitioned image

Support new-partitioned image.
Introduce rescue shell for emergency situation.

Change-Id: I4e81f3c7cbbf440a6812a85385869972892a491f
Signed-off-by: SeokYeon Hwang <syeon.hwang@samsung.com>

diff --git a/ramfs/init b/ramfs/init
index 1a5d8fcbbcaf4c63e1eb36c0ec5c4e4711919e9c..fa63b8c7d71c2b33637af2225d0f03e76537d984 100644 (file)
--- a/ramfs/init
+++ b/ramfs/init
@@ -1,16 +1,9 @@
 #!/bin/busybox sh
 # SeokYeon Hwang (syeon.hwang@samsung.com)
 
-COLOR_BLUE="\033[1;34m" # light blue
-COLOR_GREEN="\033[1;32m" # light green
-COLOR_RED="\033[1;31m" # light red
-NO_COLOR="\033[0m"
-
-NEW_ROOT="/new_root"
-
 cmdline() {
     local value
-    value=" $(cat /proc/cmdline) "
+    value=" $(/bin/busybox cat /proc/cmdline) "
     value="${value##* $1=}"
     value="${value%% *}"
     [ "$value" != "" ] && echo "$value"
@@ -19,37 +12,84 @@ cmdline() {
 /bin/busybox mkdir -p /dev
 /bin/busybox mount -t devtmpfs devtmpfs /dev
 
-exec &> /dev/console
+rescue_shell() {
+    echo -e "${COLOR_RED}Error !!! Dropping you to a shell.${NO_COLOR}"
+    /bin/busybox --install -s /bin
+    echo -e "${COLOR_BLUE}Opennng a shell on '/dev/hvc0'.${NO_COLOR}"
+    sh </dev/hvc0 >/dev/hvc0 2>&1 &
+
+    if [ -z $CONSOLE ]; then
+        CONSOLE="console"
+    fi
+
+    echo -e "${COLOR_BLUE}Opening a shell on '/dev/${CONSOLE}'.${NO_COLOR}"
+    export CONSOLE
+    exec setsid sh -c 'exec sh < /dev/${CONSOLE} >/dev/${CONSOLE} 2>&1'
+}
+
+mount_fs() {
+    /bin/busybox mount -o rw $1 $2 || rescue_shell
+}
+
+exec >/dev/console 2>&1
+
+COLOR_BLUE="\033[1;34m" # light blue
+COLOR_RED="\033[1;31m" # light red
+NO_COLOR="\033[0m"
 
 # for debugging...
 #/bin/busybox ls -la /dev >> /dev/console
 
-echo -e "${COLOR_GREEN}Preparing...${NO_COLOR}"
+echo -e "${COLOR_BLUE}Preparing...${NO_COLOR}"
 /bin/busybox mkdir -p /proc
 /bin/busybox mount -t proc proc /proc
 /bin/busybox mkdir -p /sys
 /bin/busybox mount -t sysfs sys /sys
 
-# for init...
+NEW_ROOT="/new_root"
 INIT=$(cmdline init)
-if [ -z $INIT ]; then
-    INIT="/sbin/init"
-fi
-
-# mount root...
-echo -e "${COLOR_GREEN}Mount image...${NO_COLOR}"
+CONSOLE=$(cmdline console)
 ROOT=$(cmdline root)
+
+# mount image...
+echo -e "${COLOR_BLUE}Mount image...${NO_COLOR}"
+/bin/busybox mkdir -p $NEW_ROOT
 if [ -z $ROOT ]; then
-    echo -e "${COLOR_BLUE}Mount legacy image...${NO_COLOR}"
-    /bin/busybox mount -o rw /dev/vda $NEW_ROOT
+    # mount rootfs...
+    # find rootfs...
+    ROOT=$(/bin/busybox findfs LABEL=emulator-rootfs)
+    if [ -z $ROOT ]; then
+        # for legacy image...
+        ROOT=$(/bin/busybox findfs LABEL=platform)
+    fi
+    if [ -z $ROOT ]; then
+        # failsafe...
+        ROOT=/dev/vda
+    fi
+
+    mount_fs $ROOT $NEW_ROOT
+
+    # mount system data area...
+    SYSDATA=$(/bin/busybox findfs LABEL=emulator-sysdata)
+    if [ ! -z $SYSDATA ]; then
+        mount_fs $SYSDATA $NEW_ROOT/opt
+    fi
+    # mount user area...
+    USER=$(/bin/busybox findfs LABEL=emulator-user)
+    if [ ! -z $USER ]; then
+        mount_fs $USER $NEW_ROOT/opt/usr
+    fi
 else
     echo -e "${COLOR_BLUE}Mount ${ROOT}...${NO_COLOR}"
-    /bin/busybox mount -o rw $ROOT $NEW_ROOT
+    mount_fs $ROOT $NEW_ROOT
 fi
 
 # clean up...
 /bin/busybox umount /proc
 /bin/busybox umount /sys
 
-echo -e "${COLOR_GREEN}Switching root...${NO_COLOR}"
+echo -e "${COLOR_BLUE}Switching root...${NO_COLOR}"
+if [ -z $INIT ]; then
+    INIT="/sbin/init"
+fi
 exec /bin/busybox switch_root -c /dev/console $NEW_ROOT $INIT