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Type: Bug
Resolution: Done-Errata
Priority: Normal
Fix Version/s: rhel-9.5
Affects Version/s: rhel-9.4
Component/s: libguestfs
Labels:

Fixed in Build:
libguestfs-1.50.1-9.el9
Regression:
Yes
Severity:
Moderate

Pool Team:

rhel-sst-virtualization
Sub-System Group:

ssg_virtualization

Story Points:
3
Blocked:
False
Blocked Reason:

Hide

None

Show
None
Product Documentation Required:
None
Sprint:
None

Preliminary Testing:
Pass
Errata Link:
https://errata.engineering.redhat.com/advisory/137878
Test Coverage:
None

Experience:
Architecture:

x86_64

SFDC Cases Counter:
SFDC Cases Open:
SFDC Cases Links:

Planning:
None

Description of problem：
virt-inspector: can't access: nbdkit unix socket with error 'No such file or directory'

Version-Release number of selected component (if applicable):
nbdkit-1.36.2-1.el9.x86_64
nbdkit-1.38.0-1.el9.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Use nbdkit file plugin access a raw image and use virt-inspector detect the image

# nbdkit file /home/latest-rhel9.img --filter=cow --filter=delay rdelay=200ms cow-on-read=/var/tmp --run 'time virt-inspector --format=raw -a "$uri"'  -v 
nbdkit: debug: nbdkit 1.36.2 (nbdkit-1.36.2-1.el9)
nbdkit: debug: TLS disabled: could not load TLS certificates
nbdkit: debug: service mode: unix socket
nbdkit: debug: NBD URI: nbd+unix://?socket=/tmp/nbdkitlKvFcJ/socket
nbdkit: debug: registering plugin /usr/lib64/nbdkit/plugins/nbdkit-file-plugin.so
nbdkit: debug: registered plugin /usr/lib64/nbdkit/plugins/nbdkit-file-plugin.so (name file)
nbdkit: debug: file: load
nbdkit: debug: registering filter /usr/lib64/nbdkit/filters/nbdkit-delay-filter.so
nbdkit: debug: registered filter /usr/lib64/nbdkit/filters/nbdkit-delay-filter.so (name delay)
nbdkit: debug: delay: load
nbdkit: debug: registering filter /usr/lib64/nbdkit/filters/nbdkit-cow-filter.so
nbdkit: debug: registered filter /usr/lib64/nbdkit/filters/nbdkit-cow-filter.so (name cow)
nbdkit: debug: cow: load
nbdkit: debug: cow: config key=file, value=/home/latest-rhel9.img
nbdkit: debug: delay: config key=file, value=/home/latest-rhel9.img
nbdkit: debug: file: config key=file, value=/home/latest-rhel9.img
nbdkit: debug: cow: config key=rdelay, value=200ms
nbdkit: debug: delay: config key=rdelay, value=200ms
nbdkit: debug: cow: config key=cow-on-read, value=/var/tmp
nbdkit: debug: cow: config_complete
nbdkit: debug: delay: config_complete
nbdkit: debug: file: config_complete
nbdkit: debug: using thread model: parallel
nbdkit: debug: file: get_ready
nbdkit: debug: delay: get_ready thread_model=3
nbdkit: debug: cow: get_ready thread_model=3
nbdkit: debug: cow: temporary directory for overlay: /var/tmp
nbdkit: debug: bound to unix socket /tmp/nbdkitlKvFcJ/socket
nbdkit: debug: forked into background (new pid = 103223)
nbdkit: debug: file: after_fork
nbdkit: debug: delay: after_fork
nbdkit: debug: cow: after_fork
virt-inspector: access: nbd+unix://?socket=/tmp/nbdkitlKvFcJ/socket: No such file or directory

real    0m0.028s
user    0m0.019s
sys    0m0.008s
nbdkit: debug: cow: cleanup
nbdkit: debug: delay: cleanup
nbdkit: debug: file: cleanup
nbdkit: debug: file: unload plugin
nbdkit: debug: delay: unload filter
nbdkit: debug: cow: unload filter

# nbdkit file /home/data.img --filter=cow --filter=delay rdelay=200ms cow-on-read=/var/tmp --run 'time virt-inspector --format=raw -a "$uri"'  -v 
nbdkit: debug: nbdkit 1.38.0 (nbdkit-1.38.0-1.el9)
nbdkit: debug: TLS disabled: could not load TLS certificates
nbdkit: debug: service mode: unix socket
nbdkit: debug: NBD URI: nbd+unix://?socket=/tmp/nbdkitJwALBA/socket
nbdkit: debug: registering plugin /usr/lib64/nbdkit/plugins/nbdkit-file-plugin.so
nbdkit: debug: registered plugin /usr/lib64/nbdkit/plugins/nbdkit-file-plugin.so (name file)
nbdkit: debug: file: load
nbdkit: debug: registering filter /usr/lib64/nbdkit/filters/nbdkit-delay-filter.so
nbdkit: debug: registered filter /usr/lib64/nbdkit/filters/nbdkit-delay-filter.so (name delay)
nbdkit: debug: delay: load
nbdkit: debug: registering filter /usr/lib64/nbdkit/filters/nbdkit-cow-filter.so
nbdkit: debug: registered filter /usr/lib64/nbdkit/filters/nbdkit-cow-filter.so (name cow)
nbdkit: debug: cow: load
nbdkit: debug: cow: config key=file, value=/home/data.img
nbdkit: debug: delay: config key=file, value=/home/data.img
nbdkit: debug: file: config key=file, value=/home/data.img
nbdkit: debug: cow: config key=rdelay, value=200ms
nbdkit: debug: delay: config key=rdelay, value=200ms
nbdkit: debug: cow: config key=cow-on-read, value=/var/tmp
nbdkit: debug: cow: config_complete
nbdkit: debug: delay: config_complete
nbdkit: debug: file: config_complete
nbdkit: debug: using thread model: parallel
nbdkit: debug: file: get_ready
nbdkit: debug: delay: get_ready thread_model=3
nbdkit: debug: cow: get_ready thread_model=3
nbdkit: debug: cow: temporary directory for overlay: /var/tmp
nbdkit: debug: bound to unix socket /tmp/nbdkitJwALBA/socket
nbdkit: debug: forked into background (new pid = 550809)
nbdkit: debug: file: after_fork
nbdkit: debug: delay: after_fork
nbdkit: debug: cow: after_fork
virt-inspector: access: nbd+unix://?socket=/tmp/nbdkitJwALBA/socket: No such file or directory

real    0m0.014s
user    0m0.011s
sys    0m0.002s
nbdkit: debug: cow: cleanup
nbdkit: debug: delay: cleanup
nbdkit: debug: file: cleanup
nbdkit: debug: file: unload plugin
nbdkit: debug: delay: unload filter
nbdkit: debug: cow: unload filter

Actual results:
As above description

Expected result:
virt-inspector: can access: nbdkit unix socket without error

Additional info:
Can't reproduce the bug with nbdkit-1.34.2-1.el9.x86_64

# nbdkit file /home/latest-rhel9.img --filter=cow --filter=delay rdelay=200ms cow-on-read=/var/tmp --run 'time virt-inspector --format=raw -a "$uri"' 
<?xml version="1.0"?>
<operatingsystems>
  <operatingsystem>
    <root>/dev/sda1</root>
    <name>linux</name>
    <arch>x86_64</arch>
    <distro>fedora</distro>
    <product_name>Fedora 27 (Twenty Seven)</product_name>
    <major_version>27</major_version>
    <minor_version>0</minor_version>
    <package_format>rpm</package_format>
    <package_management>dnf</package_management>
    <hostname>atest-guest</hostname>
    <osinfo>fedora27</osinfo>
    <mountpoints>
      <mountpoint dev="/dev/sda1">/</mountpoint>
    </mountpoints>
    <filesystems>
      <filesystem dev="/dev/sda1">
        <type>ext4</type>
        <uuid>ba419b80-2653-4f9b-af33-4966d1045fe6</uuid>
      </filesystem>
    </filesystems>
    <applications>
      <application>
        <name>GeoIP</name>
        <version>1.6.11</version>
        <release>3.fc27</release>
        <arch>x86_64</arch>
        <url>http://www.maxmind.com/app/c</url>
        <summary>Library for country/city/organization to IP address or hostname mapping</summary>
        <description>GeoIP is a C library that enables the user to find the country that any IP
address or hostname originates from.
.......
.......
LZMA is a general purpose compression algorithm designed by Igor Pavlov as
part of 7-Zip. It provides high compression ratio while keeping the
decompression speed fast.</description>
      </application>
      <application>
        <name>xz-libs</name>
        <version>5.2.3</version>
        <release>4.fc27</release>
        <arch>x86_64</arch>
        <url>http://tukaani.org/xz/</url>
        <summary>Libraries for decoding LZMA compression</summary>
        <description>Libraries for decoding files compressed with LZMA or XZ utils.</description>
      </application>
      <application>
        <name>zlib</name>
        <version>1.2.11</version>
        <release>4.fc27</release>
        <arch>x86_64</arch>
        <url>http://www.zlib.net/</url>
        <summary>The compression and decompression library</summary>
        <description>Zlib is a general-purpose, patent-free, lossless data compression
library which is used by many different programs.</description>
      </application>
    </applications>
  </operatingsystem>
</operatingsystems>

real    1m8.879s
user    0m2.219s
sys    0m1.508s

is cloned by

RHEL-33956 virt-inspector and other guestfs tools cannot parse nbd+unix:///-style socket URIs

Closed

links to

RHEA-2024:137878 libguestfs bug fix and enhancement update

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