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Re: [Qemu-discuss] How to redirect QEMU -serial output to both a file an
Re: [Qemu-discuss] How to redirect QEMU -serial output to both a file and the terminal or a port?
Mon, 12 Nov 2018 23:52:23 +0100
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On 11/11/2018 11:57, Ciro Santilli wrote:
I would like to be able to both interact with the system via the
command line, but also get the output to a file at the same time.
If I do:
qemu-sysem-x86_64 -serial stdio |& tee file
then it mostly works, but I would like to avoid any Bash operations
and let QEMU do the heavy lifting for me. For example, I'm using
Python, and it is not so simple to implement a reliable `tee` there.
If I do:
qemu-sysem-x86_64 -serial file:myfile
It redirects to the file and I can't give any input.
Is there a way to "combine" both `file:` and `stdio` to a single `-serial`?
Multiple `-serial` entries just create multiple serial ports instead
of modifying a single one.
I'm also interested if it works with telnet as in:
Try using the socat and tee commands to set up a pty that writes
to file and your I/O, then tell qemu to connect the serial port
to your pty. This even works for multiple virtual serial ports,
each with their own terminal window or ssh session.
I'm not completely sure, but something like
In process/shell connected to terminal window:
socat PTY:link=/run/yourpath/vm1serial,wait-slave - | tee file
In process/shell not necessarily connected to terminal window:
qemu-system-x86_64 -serial /run/yourpath/vm1serial
Where "yourpath" and "file" is up to you
There is also the "-serial pty" option to qemu, but my copy of
the qemu 2.8.0 manpage leaves it basically undocumented (it says
it creates a pty, but not what it does with it).
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10
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