enable pivot_root

bootfiles/syslinux.cfg

@@ -9,7 +9,7 @@ MENU BACKGROUND /boot/bootlogo.png
 LABEL default
 MENU LABEL Run Linux
 KERNEL /boot/vmlinuz
-APPEND vga=769 initrd=/boot/initrfs.img load_ramdisk=1 prompt_ramdisk=0 rw printk.time=0
+APPEND vga=769 initrd=/boot/initrfs.img load_ramdisk=1 prompt_ramdisk=0 rw printk.time=0 debug
 
 LABEL default
 MENU LABEL Run Linux 2

initramfs/init

@@ -2,15 +2,30 @@
 # Initial script for Linux Live Kit
 # Author: Tomas M <http://www.linux-live.org/>
 
-MEMORYDIR=/memory
-UNIONDIR=/union
-DATADIR=/mnt/data
-BUNDLESDIR=/mnt/bundles
+# This is needed to enable pivot_root
+# We simply switch initramfs to mounted ramfs
+if [ ! -r /lib/root_switched ]; then
+   echo "switch root from initramfs to ramfs"
+   SWITCH=/m
+   mkdir -p $SWITCH
+   mount -t ramfs ramfs $SWITCH
+   cp -a /* $SWITCH 2>/dev/null
+   cd $SWITCH
+   touch $SWITCH/lib/root_switched
+   exec switch_root -c /dev/console . $0
+fi
+
+MOUNTDIR=/mnt
+CHANGES=$MOUNTDIR/changes
+MEMORY=$MOUNTDIR/memory
+UNION=$MOUNTDIR/union
+DATAMNT=$MOUNTDIR/data
+BUNDLES=$MOUNTDIR/bundles
 
 export PATH=.:/:/usr/sbin:/usr/bin:/sbin:/bin
 
-. /.config
-. /livekitlib
+. /lib/.config
+. /lib/livekitlib
 
 header "Starting $LIVEKITNAME ..."
 
@@ -18,21 +33,22 @@ init_proc
 init_devs
 init_aufs
 init_zram
-init_union $MEMORYDIR $UNIONDIR
+
+init_union "$CHANGES" "$UNION"
 
 # find data dir with filesystem bundles
-DATA="$(find_data $LIVEKITNAME $DATADIR)"
+DATA="$(find_data $DATAMNT)"
 
 # copy to RAM if needed
 
 # add data to union
-union_append_bundles "$DATA" "$BUNDLESDIR" "$UNIONDIR"
+union_append_bundles "$DATA" "$BUNDLES" "$UNION"
 
 # create empty fstab
-fstab_create "$UNIONDIR"
+fstab_create "$UNION"
 
 header "Live Kit phase ends, starting $LIVEKITNAME"
-change_root "$UNIONDIR"
+change_root "$UNION"
 
 header "!!ERROR!!"
 /bin/sh

initramfs/initramfs_create

@@ -48,6 +48,7 @@ busybox/busybox | grep , | grep -v Copyright | tr "," " " | while read LINE; do
       ln -s ../bin/busybox $INITRAMFS/sbin/$TOOL
    done
 done
+rm $INITRAMFS/{s,}bin/init
 
 mknod $INITRAMFS/dev/console c 5 1
 mknod $INITRAMFS/dev/null c 1 3
@@ -75,12 +76,12 @@ touch $INITRAMFS/etc/{m,fs}tab
 
 cp init $INITRAMFS/
 chmod a+x $INITRAMFS/init
-cp ../livekitlib $INITRAMFS/
-cp ../.config $INITRAMFS/
+cp ../livekitlib $INITRAMFS/lib/
+cp ../.config $INITRAMFS/lib/
 
 cd $INITRAMFS
 find . -print | cpio -o -H newc 2>/dev/null | gzip -f --best >$INITRAMFS.img
 echo $INITRAMFS.img
 
 cd ..
-rm -Rf $INITRAMFS
+#rm -Rf $INITRAMFS

livekitlib

@@ -153,8 +153,7 @@ init_union()
    debug_log "init_union"
    mkdir -p "$1"
    mkdir -p "$2"
-   mount -t ramfs ramfs "$1"
-   mount -t aufs -o xino=$1/xino,br=$1 none "$2"
+   mount -t aufs -o xino="$1/.xino",br="$1" none "$2"
 }
 
 # Make sure to mount FAT12/16/32 using vfat
@@ -249,6 +248,9 @@ change_root()
    if [ -x sbin/init ]; then INIT=sbin/init; fi
    if [ "$INIT" = "" ]; then fatal "Can't find executable init command"; fi
 
+   mkdir -p mnt/memory
    mount -n -o remount,ro aufs .
+   pivot_root . mnt/memory
    exec $CHROOT . $INIT <dev/console >dev/console 2>&1
+#   exec switch_root -c /dev/console . $INIT
 }