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Old 03-16-2010, 06:04 PM   #1
Registered: May 2009
Distribution: Debian wheezy
Posts: 252

Rep: Reputation: 31
pivot_root complains "Invalid argument"

I am in the process of creating my own distro, and it initially boots an initramfs. My init script then mounts a certain drive (usually the one you boot from) and mounts a cramfs image containing most of the files of the distro. After that it mounts a tmpfs filesystem in a folder, and then uses unionfs to layer that on top of the mounted cramfs image. It is supposed to pivot_root into this layered filesystem, but pivot_root fails with the error message: "pivot_root: : Invalid argument". There are no kernel message concerning this error (a message from unionfs is immediately followed by the login message). I am using the busybox v1.8.2 pivot_root with a kernel. Any insight into this error would be appreciated.
Old 03-17-2010, 04:43 AM   #2
Senior Member
Registered: Mar 2003
Location: Brisbane Queensland Australia
Distribution: Custom Debian Live ISO's
Posts: 1,290

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Could you post your init script, we might be able to get a better understanding of how it is booting.
Old 03-17-2010, 09:30 AM   #3
Registered: May 2009
Distribution: Debian wheezy
Posts: 252

Original Poster
Rep: Reputation: 31
Here it is: (I hearby put this under the Gnu GPL, etc.)
clear >/dev/console
echo  'System starting.' >/dev/console
echo -n 'Mounting system filesystems...' >/dev/console
mount -t proc none /proc
mount -t sysfs none /sys
mount -t devpts none /dev/pts
echo ' done.' >/dev/console
echo -n 'Setting up serial port...' >/dev/console
stty -F /dev/ttyS0 -raw -echo 38400
echo ' done.' >/dev/console
echo -n 'Starting loggers...' >/dev/console
echo ' done.' >/dev/console
echo -n 'Loading modules...' >/dev/console
	cd /lib/modules/
	for module in *; do
		modprobe `basename $module .ko`
echo ' done.' >/dev/console
modprobe scsi_wait_scan
sleep 5
echo -n 'Searching for home device...' >/dev/console
DEVS="`echo /dev/sd?` `echo /dev/sd??` `echo /dev/sr?`"
for dev in $DEVS; do
	if mount $dev /mnt/home >>/tmp/mnterrs 2>&1; then
		if [[ -e /mnt/home/uslinux.cfs ]]; then
			umount $dev
			umount $dev
echo " $DEV." >/dev/console
echo -n 'Working...' >/dev/console
mount $DEV /mnt/home
mount -o loop /mnt/home/uslinux.cfs /mnt/cramfs
mount -t tmpfs tmpfs /mnt/data
modprobe unionfs
mount -t unionfs -o dirs=/mnt/cramfs:/mnt/data unionfs /mnt/root
pivot_root /mnt/root /mnt/root/initrd
echo ' done.' >/dev/console
echo  'Executing init...' >/dev/console
exec /bin/busybox init


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