initramfs: New modular initramfs for booting kernel from various media.

* Design principles:
* This initramfs just mounts roots and runs init on it, nothing else.
* Whenever possible, existing kernel parameters are used. When extended
  boot methods are provided, new parameters mimick/adhere to existing 
  conventions.
* System is modular/pluggable - each mount method is in own module with
  more or less well defined interface, it's possible to construct complete
  system with any combination of modules.
* Modules includes: initramfs-module-loop, initramfs-module-nfs, to boot
  from loop devices (including recursive loops) and NFS, correspondingly.

1 files changed, 31 insertions, 43 deletions

diff --git a/packages/initrdscripts/files/nfsboot.sh b/packages/initrdscripts/files/nfsboot.sh
index b536c4042b..62a044267a 100644
--- a/packages/initrdscripts/files/nfsboot.sh
+++ b/packages/initrdscripts/files/nfsboot.sh
@@ -1,50 +1,38 @@
 #!/bin/sh
 
-echo "Starting initramfs boot..."
-mkdir /proc
-mount -t proc proc /proc
-
-for arg in `cat /proc/cmdline`; do
-    echo $arg
-    optarg=`expr "x$arg" : 'x[^=]*=\(.*\)'`
-    echo $optarg
-    case $arg in
-        root=*)
-            root=$optarg ;;
-        nfsroot=*)
-            nfsroot=$optarg ;;
-        ip=*)
-            ip=$optarg ;;
+if [ "$ROOT_DEVICE" = "/dev/nfs" ]; then
+    for arg in $CMDLINE; do
+        echo $arg
+        optarg=`expr "x$arg" : 'x[^=]*=\(.*\)'`
+        echo $optarg
+        case $arg in
+            nfsroot=*)
+                nfsroot=$optarg ;;
+            ip=*)
+                ip=$optarg ;;
+        esac
+    done
+    
+    echo $ip | (IFS=: read client_ip server_ip gw_ip netmask hostname device autoconf; \
+    echo client_ip=$client_ip;
+    echo server_ip=$server_ip;
+    echo gw_ip=$gw_ip;
+    echo netmask=$netmask;
+    echo hostname=$hostname;
+    echo device=$device;
+    echo autoconf=$autoconf;
+    
+    case "$device" in
+        usb*)
+    	echo "USB"
+    	modprobe g_ether
+    	;;
     esac
-done
-
-echo $ip | (IFS=: read client_ip server_ip gw_ip netmask hostname device autoconf; \
-echo client_ip=$client_ip;
-echo server_ip=$server_ip;
-echo gw_ip=$gw_ip;
-echo netmask=$netmask;
-echo hostname=$hostname;
-echo device=$device;
-echo autoconf=$autoconf;
-
-case "x$device" in
-    usb*)
-	echo "USB"
-	modprobe g_ether
-	;;
-esac
+    
+    ifconfig $device $client_ip
+    )
 
-ifconfig $device $client_ip
-)
-
-mkdir /mnt
-if [ "x$root" = "x/dev/nfs" ]; then
     echo "booting from NFS: $nfsroot"
     mount -t nfs $nfsroot /mnt
-else
-    echo "booting from: $root"
-    mount $root /mnt
+    BOOT_ROOT=/mnt
 fi
-
-cd /mnt
-exec switch_root -c /dev/console /mnt /sbin/init