[Buildroot] How to login automatically without typing root in buildroot x86 64 QEMU?

[Buildroot] How to login automatically without typing root in buildroot x86 64 QEMU?

[Ciro Santilli]

If I do:

    git clone git://git.buildroot.net/buildroot
    cd buildroot
    git checkout 2016.05
    make qemu_x86_defconfig
    make BR2_JLEVEL=2
    qemu-system-x86_64 -M pc -kernel output/images/bzImage -drive
file=output/images/rootfs.ext2,if=virtio,format=raw -append root=/dev/vda
-net nic,model=virtio -net user

I have to type `root` into QEMU before I can use the shell.

How to configure buildroot to skip that and login directly?

Tested on Ubuntu 16.04.
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[Buildroot] How to login automatically without typing root in buildroot x86 64 QEMU?

[Thomas Petazzoni]

Hello,

On Tue, 2 Aug 2016 07:24:24 +0100, Ciro Santilli wrote:

> How to configure buildroot to skip that and login directly?

Override the default /etc/inittab, and start a shell process directly
rather than a getty process. I.e, replace:

console::respawn:/sbin/getty -n -L  console 0 vt100 # GENERIC_SERIAL

by:

console::respawn:/bin/sh

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

[Buildroot] How to login automatically without typing root in buildroot x86 64 QEMU?

[Ciro Santilli]

Thanks!

Is editing `package/busybox/inittab` the best way to do it?

Or is there a more specific `.config` option? I know about
BR2_ROOTFS_OVERLAY.

On Tue, Aug 2, 2016 at 8:41 AM, Thomas Petazzoni <
thomas.petazzoni@free-electrons.com> wrote:

> Hello,
>
> On Tue, 2 Aug 2016 07:24:24 +0100, Ciro Santilli wrote:
>
> > How to configure buildroot to skip that and login directly?
>
> Override the default /etc/inittab, and start a shell process directly
> rather than a getty process. I.e, replace:
>
> console::respawn:/sbin/getty -n -L  console 0 vt100 # GENERIC_SERIAL
>
> by:
>
> console::respawn:/bin/sh
>
> Best regards,
>
> Thomas
> --
> Thomas Petazzoni, CTO, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com
>
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[Buildroot] How to login automatically without typing root in buildroot x86 64 QEMU?

[Thomas Petazzoni]

Hello,

On Wed, 3 Aug 2016 08:52:48 +0100, Ciro Santilli wrote:

> Is editing `package/busybox/inittab` the best way to do it?

No.

> Or is there a more specific `.config` option? I know about
> BR2_ROOTFS_OVERLAY.

Yes, use an overlay to install your custom version of inittab. Or
alternatively, a post-build script to tweak the inittab at the end of
the build.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com