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

On Sun, Sep 17, 2023 at 04:11:25PM +0000, Raja Ram Sharma
wrote:
> One more help is needed :
https://github.com/libguestfs/libguestfs/issues/124
> /***************************************/
> I can get guestfs_last_error using function_callback and write to log file.
> But "event Handling" is not working Also, std::cout and std::cerr
still printing on terminal.
> Is there any workaround for Event Handling?
>  How to completely disable/enable standard output?
> /***********************************/
> 
> In short, Any Debugging sample program,
https://github.com/libguestfs/libguestfs/issues/124
In the two programs in that issue, the first program sets an event
callback and the second program sets an error handler.  To capture all
messages you must set both together.

If you can produce a single, short reproducer which uses both types of
handlers and still prints to stderr, then I can look at 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, 

Thank you for the response, will set both handler and let you know.

when we try to execute guestfs_mount_local. 
Getting below error :

[ 2023-09-19 13:34:05 ]  errno: ( 0 ) : mount_local: unknown option 554101136
(this can happen if a program is compiled against a newer version of libguestfs,
then dynamically linked to an older version)

Setup details :
OS : (PRETTY_NAME="Red Hat Enterprise Linux 8.2 (Ootpa)")
Guesfs.h version : 1.50
Guestfish version : guestfish
1.38.4rhel=8,release=15.module+el8.2.0+5297+222a20af,libvirt

In Below scenario:
1. guestfs_mount_local_run
2. umount /mountpoint
3. Again, while trying to mount, after sleep of 20sec.


Thanks
RR



 

-----Original Message-----
From: Richard W.M. Jones <rjones at redhat.com> 
Sent: Tuesday, September 19, 2023 1:15 PM
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

CAUTION: This email originated from outside of the organization. Do not click
links or open attachments unless you recognize the sender and know the content
is safe. If you feel that the email is suspicious, please report it using
PhishAlarm.


On Sun, Sep 17, 2023 at 04:11:25PM +0000, Raja Ram Sharma
wrote:
> One more help is needed : 
> https://urldefense.com/v3/__https://github.com/libguestfs/libguestfs/i
> ssues/124__;!!Obbck6kTJA!blek-uFsj3xPSaSiNQrS-1lk59I6-udl4zqOJCxZ6LLeu
> pvAFl6tPfod_GU2BLm_19gJUs3OXp6_IUEM$
> /***************************************/
> I can get guestfs_last_error using function_callback and write to log file.
> But "event Handling" is not working Also, std::cout and std::cerr
still printing on terminal.
> Is there any workaround for Event Handling?
>  How to completely disable/enable standard output?
> /***********************************/
>
> In short, Any Debugging sample program, 
> https://urldefense.com/v3/__https://github.com/libguestfs/libguestfs/i
> ssues/124__;!!Obbck6kTJA!blek-uFsj3xPSaSiNQrS-1lk59I6-udl4zqOJCxZ6LLeu
> pvAFl6tPfod_GU2BLm_19gJUs3OXp6_IUEM$
In the two programs in that issue, the first program sets an event callback and
the second program sets an error handler.  To capture all messages you must set
both together.

If you can produce a single, short reproducer which uses both types of handlers
and still prints to stderr, then I can look at that.

Rich.

--
Richard Jones, Virtualization Group, Red Hat
https://urldefense.com/v3/__http://people.redhat.com/*rjones__;fg!!Obbck6kTJA!blek-uFsj3xPSaSiNQrS-1lk59I6-udl4zqOJCxZ6LLeupvAFl6tPfod_GU2BLm_19gJUs3OXuHRnZTv$
Read my programming and virtualization blog:
https://urldefense.com/v3/__http://rwmj.wordpress.com__;!!Obbck6kTJA!blek-uFsj3xPSaSiNQrS-1lk59I6-udl4zqOJCxZ6LLeupvAFl6tPfod_GU2BLm_19gJUs3OXrVS1VaN$
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!blek-uFsj3xPSaSiNQrS-1lk59I6-udl4zqOJCxZ6LLeupvAFl6tPfod_GU2BLm_19gJUs3OXjCvHvVp$