Multi-Boot RPi from Command Line [31 Oct 2013] - Raspberry Pi Development

I wrote a shell script to multi-boot my RPi from a terminal. Script can be executed remotely via SSH or VNC.
Features:
Automatically detect all ext4 partitions of all storage devices attached to RPi (ext4 is the default partition type for hosting an RPi-compatible OS)
Reconstruct boot device names (root=/dev/*) from partition editor output. No changes are made to storage devices
Generate table of boot options and prompt user for option
Include option to shutdown
Reboot to selected rootfs, e.g. /dev/sda2 according to user-selected boot option
Script uses partition editor (parted) to identify the storage device paths. I did have to install parted on Raspbmc:
Code:
sudo apt-get install parted
Presently I have triple boot:
Raspbian #1 on SD (/dev/mmcblk0p2)
Raspbian #2 on USB HD (/dev/sda2)
Raspbmc on USB HD (/dev/sda4)
Partition Info:
PNY 16GB SD
[email protected]:/boot# parted /dev/mmcblk0 print
Model: SD SD16G (sd/mmc)
Disk /dev/mmcblk0: 16.0GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 4194kB 62.9MB 58.7MB primary fat16 lba
2 62.9MB 16.0GB 15.9GB primary ext4
Western Digital 160GB HD 7200 RPM
[email protected]:/boot# parted /dev/sda print
Model: WDC WD1600BJKT-75F4T (scsi)
Disk /dev/sda: 160GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 4194kB 62.9MB 58.7MB primary fat16 lba
2 77.6MB 21.5GB 21.5GB primary ext4
3 21.5GB 25.8GB 4295MB primary linux-swap(v1)
4 25.8GB 160GB 134GB primary ext4
And here's the boot script (/boot/rpiboot.sh):
Code:
#!/bin/sh
echo
echo "Reboot RPi to rootfs... "
cd /boot
ftxt="cmdline.txt"
fbak="cmdline.bak"
fnew="cmdline.new"
if [ -f $fnew ]
then
rm $fnew
fi
echo
rootfs=$(awk '{for (i=1; i<NF; i++) if (match($i,"root=")) {sub("root=", "", $i); print $i} }' $ftxt)
echo "Current rootfs: $rootfs"
#Reconstructing device names from partition editor output
parted /dev/mmcblk0 print > parted.txt
mmcname=$(awk '/\/dev\// {printf "%s", substr($2,1,length($2)-1) }' parted.txt)
awk -v mmcname=$mmcname '/ext4/ {printf "%sp%d\n", mmcname, $1 > "ext4.txt" }' parted.txt
parted /dev/sda print > parted.txt
mmcname=$(awk '/\/dev\// {printf "%s", substr($2,1,length($2)-1) }' parted.txt)
awk -v mmcname=$mmcname '/ext4/ {printf "%s%d\n", mmcname, $1 >> "ext4.txt" }' parted.txt
echo
echo "Boot options for rootfs:"
cat -n ext4.txt > ext4_enum.txt
more ext4_enum.txt
echo
printf "Enter boot option (press ENTER to shutdown or CNTL-z to exit):"
read -r ext4_index
if test -z "$ext4_index"
then
echo
echo "Shutting down in 3 seconds..."
sleep 3
shutdown -h now
exit 0
fi
#Determine rootfs corresponding to boot option
rootfs=$(awk -v ext4_index=$ext4_index '{if (match($1,ext4_index)) print $2}' ext4_enum.txt)
if test -z "$rootfs"
then
echo
echo "Invalid boot option or other error. Exiting..."
exit 1
fi
awk -v rootfs=$rootfs -v fnew=$fnew '{
for (i=1; i<NF; i++) if (match($i,"root=")) {$i = "root=" rootfs; print $0 > fnew} }' $ftxt
if [ -f $fnew ]
then
printf "Press ENTER to reboot to $rootfs, or CNTL-z to exit."
read -r text
mv $ftxt $fbak
mv $fnew $ftxt
fi
echo
echo "/boot/cmdline.txt:"
more $ftxt
echo "Rebooting to $rootfs in 3 seconds..."
sleep 3
reboot
exit 0
Launching rpiboot.sh as root, here are my own results of a boot switch from /dev/sda2 (Raspbian) to /dev/sda4 (Raspbmc):
Code:
[email protected] ~ $ sudo sh /boot/rpiboot.sh
Reboot RPi to rootfs...
Current rootfs: /dev/sda2
Boot options for rootfs:
1 /dev/mmcblk0p2
2 /dev/sda2
3 /dev/sda4
Enter boot option (press ENTER to shutdown or CNTL-z to exit):3
Press ENTER to reboot to /dev/sda4, or CNTL-z to exit.
/boot/cmdline.txt:
dwc_otg.lpm_enable=0 root=/dev/sda4 rootfstype=ext4 noatime quiet rootwait loglevel=1 sdhci-bcm2708.enable_l
lm=1 dwc_otg.microframe_schedule=1 dwc_otg.fiq_fix_enable=0 dwc_otg.fiq_split_enable=0 dwc_otg.trans_backoff
=3000
Rebooting to /dev/sda4 in 3 seconds...
Broadcast message from [email protected] (pts/0) (Thu Oct 31 15:28:20 2013):
The system is going down for reboot NOW!
[email protected] ~ $ Connection to 10.0.0.16 closed by remote host.
Connection to 10.0.0.16 closed.
[email protected]:~#
And voila, Raspbmc comes up. I now SSH in from my Ubuntu laptop:
Code:
[email protected]:~# ssh [email protected]
[email protected]'s password:
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
[email protected]:~$
Of course VNC renders the elegant desktop experience, and setting up VNC is fairly straightforward:
http://learn.adafruit.com/adafruit-...control-with-vnc/running-vncserver-at-startup
However VNC does not work on Raspbmc since VNC relies on the X11 window system, while Raspbmc’s XBMC implementation is rendered in the framebuffer only. Thus VNC cannot be used as there is no X-session available for connection. See:
http://www.raspbmc.com/wiki/user/frequently-asked-questions/
But SSH works well.
Blessings. Enjoy!

---

tanks!
hello is verry good
please tuto create multiboot for noobs lol

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And Raspbmc is EOL.

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help
[email protected]:~ $ df -h
Sys. de fichiers Taille Utilis▒ Dispo Uti% Mont▒ sur
/dev/root 7,2G 4,5G 2,5G 65% /
devtmpfs 364M 0 364M 0% /dev
tmpfs 368M 0 368M 0% /dev/shm
tmpfs 368M 5,3M 363M 2% /run
tmpfs 5,0M 4,0K 5,0M 1% /run/lock
tmpfs 368M 0 368M 0% /sys/fs/cgroup
tmpfs 1,0M 4,0K 1020K 1% /var/pipeyelog
/dev/mmcblk0p1 60M 20M 41M 34% /boot
tmpfs 74M 0 74M 0% /run/user/1000
/dev/sda3 6,3G 15M 6,0G 1% /media/pi/e836e8e0-22be-4f6e-8836-1f4 039a627e8
/dev/sda2 7,2G 4,5G 2,5G 65% /media/pi/ad6203a1-ec50-4f44-a1c0-e6c 3dd4c9202
/dev/sda1 60M 20M 41M 34% /media/pi/boot
[email protected]:~ $ sudo sh /boot/rpiboot.sh
Reboot RPi to rootfs...
Current rootfs: /dev/mmcblk0p2
Boot options for rootfs:
1 /dev/mmcblk0p2
Enter boot option (press ENTER to shutdown or CNTL-z to exit):^Z
[1]+ Stopp▒ sudo sh /boot/rpiboot.sh
[email protected]:~ $
why not see my sda2 and sda3 partition ( Raspbian and raspbmc ) ??