[Q&A] Linux-on-Android project

This is the thread to ask all your questions about the LinuxonAndroid project

enedil said:

Just upgraded Android to CM 11 (based on KitKat) and cannot run Linux i have downloaded the most recent bootscript.

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Click to collapse

For some reason that's not yet fully understood (by me, at least), CM11 doesn't "like" the Complete Linux Installer App. You can still run LinuxOnAndroid, but you'll have to call bootscript.sh manually, or using a script like mrhnet described 2 posts above yours. Whatever the cause is, CM11 isn't allowing the CLI App to executed it's final inside Terminal Emulator. Running this command manually, or from another script, should get LinuxOnAndroid running again on your device.

---------- Post added at 12:02 PM ---------- Previous post was at 11:45 AM ----------

pkantue said:

Section: "mounting external_sd"
----------------------------------------------

Code:

if [ -d /Removable/USBdisk1 ]; then
   $bbox mkdir $mnt/USB1
   $bbox mount -o bind /Removable/USBdisk1  $mnt/USB1
fi

if [ -d /Removable/USBdisk1 ]; then
   $bbox mkdir $mnt/USB1
   $bbox mount -o bind /Removable/USBdisk1  $mnt/USB1
fi

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Click to collapse

I haven't checked your attached file yet, but I think the following modifications to the section quoted above might help your script run more "transparently" & without throwing "directory already exists" error messages (I know, it's mainly just looks at that point, but I like seeing 0 error messages):


---------- Post added at 12:13 PM ---------- Previous post was at 12:02 PM ----------

mrhnet said:

**But one difference noted from 4.3 is that, root (sudo/su) access is needed while in VNC to access the mounted sdcard/external_sd. Maybe someone could explain why is that.. (I'm on SlimKAT 4.4.2; xperia SP).

[Highlight]EDIT: SELinux enforcing maybe not fully implemented in the ROM I'm using, although it's indicated as such. Otherwise, it's strange that I can run a script while "selinux enforcing" . However, Linux doesn't start through the app, unlike in 4.3; It starts through that 'ubuntu' script of course. So, might have to manually do "setenforce 0" before running it, in case selinux is correctly/fully implemented I think...??[/highlight]

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Click to collapse

In reply to your having to su within VNC to use /external_sd, please check your /root/init.sh script (from inside chroot linux) for a line containing "external-sd". Several of the (expecially ubuntu) images contain an init.sh with a typographical error in them; that line should contain "external_sd" instead, having it mis-typed causes an error when giving access permissions to your ubuntu user at first boot of your image.
Once that line is corrected, you will need to delete the /root/DONOTDELETE.txt file from within the chroot linux; then exit out of linux & start linux again.
When restarting linux, you'll see a moderately long chain of "error: cannot create [directory/user/group] _______, [directory/user/group] already exists" messages. Those are to be expected, as you just forced init.sh to re-install many of your initial setup environment actions. ... as long as those are the only error messages you see, the edit & re-run of init.sh should fix your problem with accessing /external_sd from within VNC.

...about the SElinux Enforcing thing. I'm not sure on this one, but I do know that shell scripts are opened & "read" once before being opened and "executed." It just might be that the setenforce 0 command is "seen" by SElinux on the first read, and thus allows the script to be executed based on that. I know it's a thin theory, but as of this moment, it's the only one I have.

Hey wrsg,

Here's the loop device debugging script I promised. Rename your /data/data/com.zpwebsites.linuxonandroid/files/bootscript.sh file to .../bootscript.old then copy the file linked below to /data/data/com.zpwebsites.linuxonandroid/files/bootscript.sh and chmod it to 0755.
After a reboot, you can run the debug script by telling the CLI app to boot your image normally (the bootscript.debug.sh script will automatically run, testing your device's ability to mount your image file on /dev/block/loop255, and /dev/block/loop1 through loop5, then exit. Please run the script this way at least once, then post the script output from your terminal here, so we can see how your device responded to the attempts. After that, you can rename bootscript.old back to bootscript.sh, and chmod to 0755, allowing CLI to load your image normally.

Script: http://www.robherc.com/hosted/linuxonandroid/bootscript.loopdebug.sh

pkantue said:

I would like to be able to talk (upload) sketches on my Arduino Uno board from within chrooted linux environment using the Arduino IDE that I installed.
...
I would really like to learn how to mount/forward usb devices to the linux environment so I can just work within the environment and not go in and out of it.

Click to expand...

Click to collapse

If you haven't done so yet, please download the newest bootscript.sh file & install according to the instructions in My LinuxOnAndroid FAQ. In the new bootscript.sh file, I have the /dev folder from android bound to /dev in linux, so you can find attached devices in there, pretty much the same as using linux directly on your home PC

robherc's LinuxOnAndroid FAQ

Hey all, I've noticed several people have been having problems that weren't addressed in the "official" linuxonandroid FAQ, so I have started building my own unofficial "add-on FAQ" here: http://www.robherc.com/hosted/linuxonandroid/FAQ.html
It's by no means an exhaustive resource, but it should help several of you at least get a head-start on the troubleshooting process while you're first working on getting LinuxOnAndroid, or the Complete Linux Installer app, running on your device. Over the next several weeks, I'll be continuing to add new topics to expand my FAQ, so check it regularly for updates, and please let me know if there's anything you'd like to see added. :good: