Standard disclaimer:
this script may bork your phone, trash your userdata, format system files, and etc., ad nauseum. Use at your own risk.
This script remounts / and /system both read/write and leaves them that way until you type exit in the bash shell of the chroot. Without r/w mounting, installing Debian packages gives some errors, since it's running in the real root filesystem.
All that aside, it's never hurt my device since beginning this experiment in early March, and I've had less than 5 crashes which required a reboot; no crashes at all since March.
Ok, enough suspense.
I've tested my condensed boot script for a day and can't find any obvious glitches, so here it is attached as boot.txt; the forum wouldn't let me attach it without an extension, so rename as boot with no extension.
I remount system r/w, copy the file to /system/xbin and chmod 4755 /system/xbin/boot
Assuming boot.txt is on your phone in /sdcard/download you can type this in a terminal:
Code:
su
mount -o remount /system /system
cp /sdcard/download/boot.txt /system/xbin/boot
chmod 4755 /system/xbin/boot
or with ADB, if boot.txt is in your current working directory
Code:
adb remount
adb push boot.txt /system/xbin/boot
adb shell
su
chmod 4755 /system/xbin/boot
exit
my Debian filesystem is on my 2nd sdcard partition. The comments in the script should explain how to use another partition if you have apps2sd running or somesuch (I don't have many Android apps on my phone so don't need/use apps2sd function)
to use the script as-is, your linux flavor should be in the 2nd card partition.
open a terminal and type
don't kill the terminal app... leave it running in the background.
when you're finished with linux, reopen the same terminal and type
to cleanly dismount your linux. No reboot required!
notes:
after much experimentation, I prefer the shell in SL4A for a terminal (even though the devs say it's old connectbot) because it runs the terminal as a service rather than just a process. It seems to be less likely for Android's oom killer to terminate that way.
hopefully this helps someone else out. I spent quite a while getting it just how I wanted it, many googlings and picking bits from here and there.
edit: just FYI, I tested this with Cyanogen and AOSP ROMs, with busybox symlinked to the commands it replaces. Doesn't work with stock ROM or others where you have to type things like 'busybox mount -o /system /system'
Also, I initially copied all files from overlapping Android directories into their Debian counterparts, with no overwrites, BEFORE running the boot script (this only needs to be done once AFAIK)
Code:
yes n | cp -aiv /etc/* /sd-ext/etc
yes n | cp -aiv /root/* /sd-ext/root
yes n | cp -aiv /sbin/* /sd-ext/sbin
yes n | cp -aiv /sys/* /sd-ext/sys
for whomever may be interested, when I began this I couldn't find a small, fresh debian filesystem image for download so I had to learn to use debootstrap.
05-08-2011 05:34 PM
