Chroot in with shell script [SOLVED]

catchpole · Last edited by catchpole on Wed Nov 05, 2014 2:12 pm; edited 1 time in total

Newbie.

I'm in the process of installing Gentoo and need to frequently chroot into the sda4 partition from Linux Mint on sda3, so I thought I'd write a script to do that.
However, it won't work.
I've followed the handbook down to section 8 so far.

Here's the script:

guitou · Guru Joined: 02 Oct 2003 Posts: 534 Location: France

Hello.

First, if you do "su", doing "sudo" after is useless.
Then, regarding your issue, it's probably a matter of environment: try "su -" to load env for root, or type full command path ("/sbin/mount")

++
Gi)

Nicias · Guru Joined: 06 Dec 2005 Posts: 446

you "su" command starts a new shell. Your script is waiting for that shell to finish.

remove the "su" command. See if that works.

steveL · Posted: Wed Nov 05, 2014 10:06 am Post subject:

catchpole · Posted: Wed Nov 05, 2014 10:07 am Post subject:

Hi Niclas, guitou,

I've tried your suggestions and every combination of the "x-teminal-emulator" and su lines but all I can get it to do is open the x-terminal in the host Mint xfce where I'm starting from.

Just to check if it was executing the other commands but not letting me chroot in, I tried "sudo chroot /mnt/gentoo" in the terminal.
I got an error message:

steveL · Posted: Wed Nov 05, 2014 12:27 pm Post subject:

catchpole · Posted: Wed Nov 05, 2014 12:43 pm Post subject:

Hi steveL,

I've followed the handbook down to section 8 so I'm past the the tarball untar stage.

If I put the commands in manually everything works and I'm chrooted in.
Its the script that's not working.

I start up with the already installed Mint 13 xfce on sda3 and chroot in from there to sda4 where I untarred stage 3.
bash is present on both partitions.
_________________
Noob
With experience of Mint and trying to learn more by intalling Gentoo
Motherboard = MS-7211- MICRO-STAR INTERNATIONAL CO., LTD
CPU = Intel(R) Celeron(R) CPU 2.80GHz version: 15.4.9
Memory = 2GB

py-ro · Veteran Joined: 24 Sep 2002 Posts: 1734 Location: Velbert

Maybe you should describe what you realy try to archive.

If read your post i would guess:

Start a Terminal Emulator, getting root inside, mount the partitions and then do the chroot.

Your can't do this, like you tried. The commands would be executed after your terminal has finished, but you need to do it inside.

Following a small example (untested) which could work:

(I substitute x-terminal-emulator with xterm, since i don't know which program is behind that)

catchpole · Posted: Wed Nov 05, 2014 2:11 pm Post subject:

Hi py-ro,

I used your code and it worked.
Thanks very much. (Danke schön)

Just one question:
There is a "sudo" in with the 4th command. I guess this is not intended to be there because of the first "su".
Is that the case?

Thanks again, it will save me a lot of tedious typing.
(I'm still puzzled why it works when its in one line and not separate commands!)
_________________
Noob
With experience of Mint and trying to learn more by intalling Gentoo
Motherboard = MS-7211- MICRO-STAR INTERNATIONAL CO., LTD
CPU = Intel(R) Celeron(R) CPU 2.80GHz version: 15.4.9
Memory = 2GB

py-ro · Veteran Joined: 24 Sep 2002 Posts: 1734 Location: Velbert

Yeah, this sudo is not intended.

Your problem is who will execute the commands.

With my code the xterm calls su, which in return calls the mount and chroot command.

Your code resulted in opening a term, then calling su in the calling environment, not inside the term, and so on.

Bye
Py