init

1 files changed, 66 insertions, 0 deletions

diff --git a/init b/init
new file mode 100755
index 0000000..acf61d1
--- /dev/null
+++ b/init
@@ -0,0 +1,66 @@
+#!/bin/busybox sh
+
+#set -x
+
+ROOT=/dev/disk/by-label/rootfs
+HOME=/dev/disk/by-uuid/092fdc4a-4356-47d9-9272-9a5f58e33bbf
+
+prep_dev()
+{
+    for opt in `cat /proc/cmdline`; do
+      name=$(echo $opt | cut -d'=' -f 1)
+      if [ $name == "root" ] || [ $name == "resume" ] || [ $name == "crypt_part" ]; then
+        type=$(echo $opt | cut -d'=' -f 2)
+        id=$(echo $opt | cut -d'=' -f 3)
+        if [ $type == LABEL ]; then
+          prefix="/dev/disk/by-label";
+        elif [ $type == UUID ]; then
+          prefix="/dev/disk/by-uuid"
+        fi
+        mkdir -p $prefix
+        full="$prefix/$id" 
+        if [ ! -e $full ]; then
+          ln -s $(findfs "$type=$id") $full 
+        fi
+      fi
+    done
+}
+
+rescue_shell()
+{
+    echo "Something went wrong. Dropping you to a shell."
+    busybox --install -s
+    exec /bin/sh
+}
+
+cryptsetup_do()
+{
+  echo "cryptsetup $1 $2"
+  cryptsetup -T 3 luksOpen $1 $2 
+}
+
+mount_root()
+{
+  echo "mount root $1"
+  mount -o ro $1 /newroot
+}
+
+# Mount the /dev, /proc and /sys filesystems.
+mount -t devtmpfs none /dev
+mount -t proc none /proc
+mount -t sysfs none /sys
+
+# Do your stuff here.
+prep_dev
+cryptsetup_do $HOME home
+resume
+mount_root $ROOT || rescue_shell
+
+# Clean up.
+umount /dev
+umount /proc
+umount /sys
+
+# Boot the real thing.
+exec switch_root /newroot /sbin/init
+