[solved] scripting inside a chroot from outside

scrawler · 2020-04-04 16:33:08

Hi guys,

Is it possible to write a script that enters a chrooted environment, does something, exits, and continues? How?

I have a script that does most of what it's supposed to, but then I have to chroot manually to finish up. It would be nice to also automate the manual steps.
Thanks.

Last edited by scrawler (2020-04-05 01:43:13)

ayekat · 2020-04-04 17:31:07

You'll notice that "entering a chroot" is actually just "running a command inside a chroot".

In many cases, you simply want to run an interactive shell, hence you do something like `chroot /dir /bin/bash`.
But you can also just run something else, e.g. copy/generate a script somewhere within that directory and then invoke it with `chroot /dir /path/to/some/script`.

Trilby · 2020-04-04 17:43:45

mount /dev/sda1 /mnt
cat <<EOF > /mnt/runme
echo hello world
EOF
chmod 0755 /mnt/runme
chroot /mnt /runme
rm /mnt/runme

This script, living outside the chroot, echos 'hello world' from inside a chroot.

EDIT: see below ... that's much better. I've never bothered to make an automated installation script.

Last edited by Trilby (2020-04-04 17:49:12)

Head_on_a_Stick · 2020-04-04 17:47:09

^ Simpler version:

mount /dev/sda1 /mnt
chroot /mnt /bin/bash <<END
echo hello world
END

scrawler · 2020-04-04 18:39:42

Thank you guys, I'll tell you how it works. :-)

scrawler · 2020-04-05 01:42:30

Worked great, as expected--will mark solved. Thanks again everybody.

Arch Linux

#1 2020-04-04 16:33:08

[solved] scripting inside a chroot from outside

#2 2020-04-04 17:31:07

Re: [solved] scripting inside a chroot from outside

#3 2020-04-04 17:43:45

Re: [solved] scripting inside a chroot from outside

#4 2020-04-04 17:47:09

Re: [solved] scripting inside a chroot from outside

#5 2020-04-04 18:39:42

Re: [solved] scripting inside a chroot from outside

#6 2020-04-05 01:42:30

Re: [solved] scripting inside a chroot from outside

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