Hi Richard, Thank you for the reply, I hope this mail finds you well. We resolved guestfs_add_drive failure, now guestfs_add_drive is adding disk successfully after adding "format:raw". But guestfs_launch is failing Kindly help me to troubleshoot or to find any workaround. Error_callback is in-place, it return guestfs_last_error() guestfs_last_error(): [ 2023-09-16 17:24:20 ] errno: ( 10 ) : command: waitpid: No child processes [ 2023-09-16 17:24:20 ] errno: ( 10 ) : command: waitpid: No child processes While: guestfs_lanch error: libguestfs: trace: set_verbose true libguestfs: trace: set_verbose = 0 libguestfs: trace: set_backend "direct" libguestfs: trace: set_backend = 0 libguestfs: create: flags = 0, handle = 0xbb0a70, program = greagent.exe libguestfs: trace: add_drive "/var/opt/omni/tmp/GRE/5029f5c4-e08d-23e1-07d3-96c5c7ffeeac/2023/09/16-3/5029f5c4-e08d-23e1-07d3-96c5c7ffeeac/Datastore2-9166/RAJATEST/RAJATEST_1-flat.vmdk" "format:raw" libguestfs: trace: add_drive = 0 libguestfs: trace: add_drive "/var/opt/omni/tmp/GRE/5029f5c4-e08d-23e1-07d3-96c5c7ffeeac/2023/09/16-3/5029f5c4-e08d-23e1-07d3-96c5c7ffeeac/Datastore2-9166/RAJATEST/RAJATEST_2-flat.vmdk" "format:raw" libguestfs: trace: add_drive = 0 libguestfs: trace: add_drive "/var/opt/omni/tmp/GRE/5029f5c4-e08d-23e1-07d3-96c5c7ffeeac/2023/09/16-3/5029f5c4-e08d-23e1-07d3-96c5c7ffeeac/Datastore2-9166/RAJATEST/RAJATEST-flat.vmdk" "format:raw" libguestfs: trace: add_drive = 0 libguestfs: trace: launch libguestfs: trace: max_disks libguestfs: trace: max_disks = 255 libguestfs: trace: get_tmpdir libguestfs: trace: get_tmpdir = "/tmp" libguestfs: trace: version libguestfs: trace: version = <struct guestfs_version = major: 1, minor: 38, release: 4, extra: rhel=8,release=15.module+el8.2.0+5297+222a20af,libvirt, > libguestfs: trace: get_backend libguestfs: trace: get_backend = "direct" libguestfs: launch: program=greagent.exe libguestfs: launch: version=1.38.4rhel=8,release=15.module+el8.2.0+5297+222a20af,libvirt libguestfs: launch: backend registered: unix libguestfs: launch: backend registered: uml libguestfs: launch: backend registered: libvirt libguestfs: launch: backend registered: direct libguestfs: launch: backend=direct libguestfs: launch: tmpdir=/tmp/libguestfsMzD9Rl libguestfs: launch: umask=0002 libguestfs: launch: euid=0 libguestfs: is_openable: /dev/kvm: No such file or directory libguestfs: trace: get_backend_setting "force_tcg" libguestfs: trace: get_backend_setting = NULL (error) libguestfs: trace: get_cachedir libguestfs: trace: get_cachedir = "/var/tmp" libguestfs: begin building supermin appliance libguestfs: run supermin libguestfs: command: run: /usr/bin/supermin libguestfs: command: run: \ --build libguestfs: command: run: \ --verbose libguestfs: command: run: \ --if-newer libguestfs: command: run: \ --lock /var/tmp/.guestfs-0/lock libguestfs: command: run: \ --copy-kernel libguestfs: command: run: \ -f ext2 libguestfs: command: run: \ --host-cpu x86_64 libguestfs: command: run: \ /usr/lib64/guestfs/supermin.d libguestfs: command: run: \ -o /var/tmp/.guestfs-0/appliance.d supermin: version: 5.1.19 supermin: rpm: detected RPM version 4.14 supermin: package handler: fedora/rpm supermin: acquiring lock on /var/tmp/.guestfs-0/lock supermin: if-newer: output does not need rebuilding libguestfs: trace: launch = -1 (error) libguestfs: trace: close libguestfs: closing guestfs handle 0xbb0a70 (state 0) libguestfs: command: run: rm libguestfs: command: run: \ -rf /tmp/libguestfsMzD9Rl Thanks RR -----Original Message----- From: Richard W.M. Jones <rjones@redhat.com> Sent: Saturday, September 16, 2023 9:39 PM To: Teja Konapalli <tkonapalli@opentext.com> Cc: libguestfs@redhat.com; Raja Ram Sharma <rsharma6@opentext.com>; Divyanshu Kumar <dkumar3@opentext.com> Subject: [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 Sat, Sep 16, 2023 at 03:56:07PM +0000, Teja Konapalli wrote:

Hi Richard & Team,

Could you please help here on the below failure of mounting disk using libguestfs.

OS version: RHEL 8.2

Libguestfs version: 1.38.0 stable

Error logs:

libguestfs: trace: add_drive_ro "/var/opt/tmp/GRE//RAJA/RAJAT-flat.vmdk" libguestfs: trace: add_drive "/var/opt/tmp/GRE//RAJA/RAJAT-flat.vmdk" "readonly:true" libguestfs: creating COW overlay to protect original drive content libguestfs: trace: disk_create "/tmp/libguestfsCpl8My/overlay3.qcow2" "qcow2" -1 "backingfile:/var/opt/tmp/GRE//RAJA/RAJAT-flat.vmdk" libguestfs: command: run: qemu-img libguestfs: command: run: \ create libguestfs: command: run: \ -f qcow2 libguestfs: command: run: \ -o backing_file=/var/opt/tmp/GRE//RAJA/ RAJAT-flat.vmdk libguestfs: command: run: \ /tmp/libguestfsCpl8My/overlay3.qcow2 Formatting '/tmp/libguestfsCpl8My/overlay3.qcow2', fmt=qcow2 size=21474836480 backing_file=/var/opt/tmp/GRE//RAJA/RAJAT-flat.vmdk cluster_size=65536 lazy_refcounts=off refcount_bits=16 libguestfs: trace: disk_create = -1 (error)

^^ There should be an error message between this two lines. Without seeing what the error is, it's hard to know what the problem is. Is this happening in a program you wrote? If so you probably want to read the bit about how to handle error messages: https://urldefense.com/v3/__https://libguestfs.org/guestfs.3.html*error-hand... Rich.

libguestfs: trace: add_drive = -1 (error) libguestfs: trace: add_drive_ro = -1 (error) libguestfs: trace: close libguestfs: closing guestfs handle 0x1e89340 (state 0) libguestfs: command: run: rm libguestfs: command: run: \ -rf /tmp/libguestfsCpl8My

-- Richard Jones, Virtualization Group, Red Hat https://urldefense.com/v3/__http://people.redhat.com/*rjones__;fg!!Obbck6kTJ... Read my programming and virtualization blog: https://urldefense.com/v3/__http://rwmj.wordpress.com__;!!Obbck6kTJA!cv1KjwD... virt-builder quickly builds VMs from scratch https://urldefense.com/v3/__http://libguestfs.org/virt-builder.1.html__;!!Ob...

Hi Richard, Please find attachment. Thanks RR -----Original Message----- From: Richard W.M. Jones <rjones@redhat.com> Sent: Sunday, September 17, 2023 12:01 AM To: Raja Ram Sharma <rsharma6@opentext.com> Cc: Teja Konapalli <tkonapalli@opentext.com>; libguestfs@redhat.com; Divyanshu Kumar <dkumar3@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. Hi, can you run: libguestfs-test-tool and send us the complete output. Rich. -- Richard Jones, Virtualization Group, Red Hat https://urldefense.com/v3/__http://people.redhat.com/*rjones__;fg!!Obbck6kTJ... Read my programming and virtualization blog: https://urldefense.com/v3/__http://rwmj.wordpress.com__;!!Obbck6kTJA!cUhKTzk... 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__;!!Obbck6kT...

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@redhat.com> Sent: Sunday, September 17, 2023 2:07 AM To: Raja Ram Sharma <rsharma6@opentext.com> Cc: Teja Konapalli <tkonapalli@opentext.com>; libguestfs@redhat.com; Divyanshu Kumar <dkumar3@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. 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!!Obbck6kTJ... Read my programming and virtualization blog: https://urldefense.com/v3/__http://rwmj.wordpress.com__;!!Obbck6kTJA!dH7uryq... 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__;!!Obbck6kT...

Thank you, Richard! Guestfs_launch was failing due to internal program issue. Since guesfs_launch creates new process for guesfs process. Hence, Guestfs_launch was failing since new process creation failed in internal program due to remote connection. We resolved using Deamon and Sender logic. When Deamon will receive message from sender to launch guest it will launch guestfs runner program => Happy Path is working. 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 Libguestfs:issue$124, contains sample program. Thanks RR -----Original Message----- From: Richard W.M. Jones <rjones@redhat.com> Sent: Sunday, September 17, 2023 2:12 PM To: Raja Ram Sharma <rsharma6@opentext.com> Cc: Teja Konapalli <tkonapalli@opentext.com>; libguestfs@redhat.com; Divyanshu Kumar <dkumar3@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 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 https://urldefense.com/v3/__http://people.redhat.com/*rjones__;fg!!Obbck6kTJ... Read my programming and virtualization blog: https://urldefense.com/v3/__http://rwmj.wordpress.com__;!!Obbck6kTJA!cGvW3aE... nbdkit - Flexible, fast NBD server with plugins https://urldefense.com/v3/__https://gitlab.com/nbdkit/nbdkit__;!!Obbck6kTJA!...

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@redhat.com> Sent: Tuesday, September 19, 2023 1:15 PM To: Raja Ram Sharma <rsharma6@opentext.com> Cc: Teja Konapalli <tkonapalli@opentext.com>; libguestfs@redhat.com; Divyanshu Kumar <dkumar3@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!!Obbck6kTJ... Read my programming and virtualization blog: https://urldefense.com/v3/__http://rwmj.wordpress.com__;!!Obbck6kTJA!blek-uF... 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__;!!Obbck6kT...

Hi @Richard W.M. Jones, I am attaching a sample program of how we are using guestfs apis where we are getting this error guestfs_mount_local fail. Please take a look into this. Thanks, Divyanshu -----Original Message----- From: Richard W.M. Jones <rjones@redhat.com> Sent: Tuesday, September 19, 2023 5:36 PM To: Raja Ram Sharma <rsharma6@opentext.com> Cc: Teja Konapalli <tkonapalli@opentext.com>; libguestfs@redhat.com; Divyanshu Kumar <dkumar3@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 Tue, Sep 19, 2023 at 11:59:43AM +0000, Raja Ram Sharma wrote:

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)

I attach what I said previously. Rich.

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@redhat.com> Sent: Tuesday, September 19, 2023 1:15 PM To: Raja Ram Sharma <rsharma6@opentext.com> Cc: Teja Konapalli <tkonapalli@opentext.com>; libguestfs@redhat.com; Divyanshu Kumar <dkumar3@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-udl4zqOJCxZ6LL eu 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-udl4zqOJCxZ6LL eu 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!!Obb ck6kTJA!blek-uFsj3xPSaSiNQrS-1lk59I6-udl4zqOJCxZ6LLeupvAFl6tPfod_GU2BL m_19gJUs3OXuHRnZTv$ Read my programming and virtualization blog: https://urldefense.com/v3/__http://rwmj.wordpress.com__;!!Obbck6kTJA!b lek-uFsj3xPSaSiNQrS-1lk59I6-udl4zqOJCxZ6LLeupvAFl6tPfod_GU2BLm_19gJUs3 OXrVS1VaN$ 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__;!!Ob bck6kTJA!blek-uFsj3xPSaSiNQrS-1lk59I6-udl4zqOJCxZ6LLeupvAFl6tPfod_GU2B Lm_19gJUs3OXjCvHvVp$

-- Richard Jones, Virtualization Group, Red Hat https://urldefense.com/v3/__http://people.redhat.com/*rjones__;fg!!Obbck6kTJ... Read my programming and virtualization blog: https://urldefense.com/v3/__http://rwmj.wordpress.com__;!!Obbck6kTJA!ZE9Jts1... 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__;!!Obbck6kT...