Libguestfs - Sep 2023 - [EXTERNAL] - Re: LIBGUESTFS mount disk failure

Thanks for providing the libguestfs-test-tool output in a previous
message.
> While: guestfs_lanch error:
> 	libguestfs: trace: set_verbose true
> 	libguestfs: trace: set_verbose = 0
> 	libguestfs: trace: set_backend "direct"
> 	libguestfs: trace: set_backend = 0
Here you're setting backend = "direct", and while that isn't
necessarily a problem in itself, the libguestfs-test-tool output that
you provided was for the (normal, for RHEL) libvirt backend.

This could make a difference, so what's the output of:

  $ LIBGUESTFS_BACKEND=direct libguestfs-test-tool

?

By the way, unless you have a specific reason to set
'LIBGUESTFS_BACKEND=direct' that you can articulate, it is best not to
set this as it is less secure and less well tested.  If you just
copied that environment variable from somewhere without understanding
why, then don't do that.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
Fedora Windows cross-compiler. Compile Windows programs, test, and
build Windows installers. Over 100 libraries supported.
http://fedoraproject.org/wiki/MinGW

Hi Richard, 

Wish you a happy weekend! 

Guestfs_launch fails after below error :
	^^^^
	libguestfs: is_openable: /dev/kvm: No such file or directory
	libguestfs: trace: get_backend_setting "force_tcg"
	libguestfs: trace: get_backend_setting = NULL (error)
	^^^
Same line has also printed in " LIBGUESTFS_BACKEND=direct
libguestfs-test-tool " at line $96-$98
	^^^
	Could not access KVM kernel module: No such file or directory
	qemu-kvm: failed to initialize KVM: No such file or directory
	^^^

Please find attachment of $> LIBGUESTFS_BACKEND=direct libguestfs-test-tool

Thanks 
RR


-----Original Message-----
From: Richard W.M. Jones <rjones at redhat.com> 
Sent: Sunday, September 17, 2023 2:07 AM
To: Raja Ram Sharma <rsharma6 at opentext.com>
Cc: Teja Konapalli <tkonapalli at opentext.com>; libguestfs at redhat.com;
Divyanshu Kumar <dkumar3 at opentext.com>
Subject: Re: [EXTERNAL] - Re: LIBGUESTFS mount disk failure

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Thanks for providing the libguestfs-test-tool output in a previous message.
> While: guestfs_lanch error:
>       libguestfs: trace: set_verbose true
>       libguestfs: trace: set_verbose = 0
>       libguestfs: trace: set_backend "direct"
>       libguestfs: trace: set_backend = 0
Here you're setting backend = "direct", and while that isn't
necessarily a problem in itself, the libguestfs-test-tool output that you
provided was for the (normal, for RHEL) libvirt backend.

This could make a difference, so what's the output of:

  $ LIBGUESTFS_BACKEND=direct libguestfs-test-tool

?

By the way, unless you have a specific reason to set
'LIBGUESTFS_BACKEND=direct' that you can articulate, it is best not to
set this as it is less secure and less well tested.  If you just copied that
environment variable from somewhere without understanding why, then don't do
that.

Rich.

--
Richard Jones, Virtualization Group, Red Hat
https://urldefense.com/v3/__http://people.redhat.com/*rjones__;fg!!Obbck6kTJA!dH7uryqvh0lZ5fENv-UGELBhZf_4YeDluWD8HOiX9HhMDMbDUVpoUkP-GHdUVq06f9twxzOInZAGIZOv$
Read my programming and virtualization blog:
https://urldefense.com/v3/__http://rwmj.wordpress.com__;!!Obbck6kTJA!dH7uryqvh0lZ5fENv-UGELBhZf_4YeDluWD8HOiX9HhMDMbDUVpoUkP-GHdUVq06f9twxzOInU_4VCMe$
Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows
installers. Over 100 libraries supported.
https://urldefense.com/v3/__http://fedoraproject.org/wiki/MinGW__;!!Obbck6kTJA!dH7uryqvh0lZ5fENv-UGELBhZf_4YeDluWD8HOiX9HhMDMbDUVpoUkP-GHdUVq06f9twxzOInTq6QXk4$

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On Sun, Sep 17, 2023 at 03:55:24AM +0000, Raja Ram Sharma
wrote:
> Hi Richard, 
> 
> Wish you a happy weekend! 
> 
> Guestfs_launch fails after below error :
> 	^^^^
> 	libguestfs: is_openable: /dev/kvm: No such file or directory
> 	libguestfs: trace: get_backend_setting "force_tcg"
> 	libguestfs: trace: get_backend_setting = NULL (error)
> 	^^^
> Same line has also printed in " LIBGUESTFS_BACKEND=direct
libguestfs-test-tool " at line $96-$98
> 	^^^
> 	Could not access KVM kernel module: No such file or directory
> 	qemu-kvm: failed to initialize KVM: No such file or directory
> 	^^^
Thanks for providing the second output.

The above messages aren't errors.

I really need much more context.  I need to see the program that
you're trying to run, or a self-contained reproducer, and I also need
to see the _complete_ output from the program from start to finish,
not just small parts of it.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
nbdkit - Flexible, fast NBD server with plugins
https://gitlab.com/nbdkit/nbdkit