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Re: qemu redirecting guest output in terminal




On 10/26/2018 9:16 AM, john doe wrote:
> On 10/25/2018 8:55 PM, Reco wrote:
>> 	Hi.
>>
>> On Thu, Oct 25, 2018 at 05:20:46PM +0200, john doe wrote:
>>> Hi,
>>>
>>> I'm trying to install Debian, it works if I do use the below command:
>>>
>>> qemu -hda debian.img -cdrom debian-9.5.0-amd64-netinst.iso -boot d -m 1024
>>>
>>> I'd like to redirect the output of the guest (Debian) to the terminal so
>>> I have added '-nographic':
>>>
>>> qemu -hda debian.img -cdrom debian-9.5.0-amd64-netinst.iso -boot d -m
>>> 1024 -nographic
>>>
>>> The guest is running but I don't see any Debian output in the terminal.
>>>
>>> What argument(s) should I use to redirect the output of the guest in the
>>> terminal?
>>>
>>> I appriciate any input.
>>
>> That's tricky one.
>> -nographic means you discard VGA/keyboard/mouse emulation and the only
>> means of user interaction is RS232 emulation.
>>
>> And that means that now you have three problems:
>>
>> 1) All x86 bootloaders in Debian are configured for VGA/keyboard
>> input/output.
>> That includes GRUB2 in a conventional install, and syslinux that's used
>> in installer.
>>
>> 2) Linux kernel built for x86 use VGA for output by default.
>> RS232 means appending something like 'console=ttyS0,115200n8' to
>> kernel's commandline.
>>
>> 3) Systemd respects console= from kernel's commandline, but I cannot say
>> the same for other init systems.
>>
>>
>> But, you're using QEMU and that means you're in luck.
>> Unpack netinst image, extract vmlinux and initrd.gz from it. You won't
>> need anything else from it anyway.
>>
>> Run QEMU this way:
>>
>> qemu -hda debian.img -m 1024 -nographic \
>> 	-kernel vmlinux -append 'console=ttyS0,115200n8' \
>> 	-initrd initrd.gz
>>
>> Replace -kernel, -initrd and -append with '-boot c' after the
>> installation.
>> Also consider using '-M q35' instead of old '-M pc' you're using now.
>>
> 
> Thanks to the help of "Dejan Jocic <jodejka@xxxxxxxxx>" and to this
> answer I manage to get the output of the guest redirected in the
> terminal by using the following command:
> 
> PS C:\qemu> clear; & 'C:\Program Files\qemu\qemu-system-x86_64.exe' -hda
> debian.img -cdrom debian-9.5.0-amd64-netinst.iso -boot d -m 1024
> -nographic -kernel vmlinuz -append 'console=ttyS0,115200n8
> DEBIAN_FRONTEND=text priority=low' -initrd initrd.gz
> 
> As you can see it is done on Windows and when attempting to install
> Debian the output is a bit mest up:
> 
> Choose the next step in the install process:
>   1: Choose language [*],
>   2: Access software for a blind person using a braille display,
>   3: Configure the keyboard,
>   4: Detect and mount CD-ROM,
>   5: Load installer components from CD,
>   6: Change debconf priority,
>   7: Check the CD-ROM(s) integrity,
>   8: Save debug logs,
>   9: Execute a shell,
>  10: Abort the installation,
> Prompt: '?' for help, default=1> 1
> 
> Select a language
> -----------------
> 
> Choose the language to be used for the installation process. The selected
> language will also be the default language for the installed system.
> Language:
> ←[22A←[M←[22BPrompt: '?' for help, default=2> ←
> 
> Looks like it is character encoding related.
> 
> I understand that it is Windows/powershell but if anyone has a hint,
> that would be awesome! :)
> 
> Note that this e-mail is folded by my mailer.
> 

Using Cygwin the output is not mest up but during the installation I'm
stuck at:

"No disk drive was detected. If you know the name of the driver needed
by your
disk drive, you can select it from the list.
Driver needed for your disk drive:
  1: continue with no disk drive [*], 46: loop,"

Should I select the default option (1) or what should I do?

Thanks for any help.

-- 
John Doe