v4l2loopback-dkms FTBS in noble with the latest linux 6.8 kernel

[Andrea Righi]

[Impact]

/var/lib/dkms/v4l2loopback/0.12.7/build/v4l2loopback.c: In function ‘vidioc_querycap’:
/var/lib/dkms/v4l2loopback/0.12.7/build/v4l2loopback.c:742:9: error: implicit declaration of function ‘strlcpy’; did you mean ‘strscpy’? [-Werror=implicit-function-declaration]
  742 | strlcpy(cap->driver, "v4l2 loopback", sizeof(cap->driver));
      | ^~~~~~~
      | strscpy
cc1: some warnings being treated as errors

[Test case]

 $ sudo apt install v4l2loopback-dkms

[Fix]

Apply the required changes to the v4l2loopback module to support the new kernel 6.8 ABI.

[Regression potential]

We may experience regressions in systems that are using tbe loopback webcam driver.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: v4l2loopback-dkms 0.12.7-2ubuntu4
ProcVersionSignature: User Name 6.8.0-7.7-generic 6.8.0-rc3
Uname: Linux 6.8.0-7-generic x86_64
ApportVersion: 2.27.0-0ubuntu6
Architecture: amd64
CasperMD5CheckResult: unknown
CloudArchitecture: x86_64
CloudBuildName: server
CloudID: nocloud
CloudName: unknown
CloudPlatform: nocloud
CloudSerial: 20240208
CloudSubPlatform: config-disk (/dev/vdb)
Date: Fri Feb 9 12:47:10 2024
PackageArchitecture: all
ProcEnviron:
 LANG=C.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: v4l2loopback
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

This bug was fixed in the package v4l2loopback - 0.12.7-2ubuntu5

---------------
v4l2loopback (0.12.7-2ubuntu5) noble; urgency=medium

  * Support Linux 6.8 (LP: #2052801):
    - debian/patches/0008-handle-strlcpy.patch

 -- Andrea Righi <email address hidden> Fri, 09 Feb 2024 14:25:38 +0000