ntfs-3g should switch to fuse3 (build-)dependencies

[Paride Legovini]

As outlined in the fuse3 MIR bug LP: #1934510 the current plan is to demote fuse2 to universe before the end of the 22.04 cycle. The ntfs-3g currently has dependencies on fuse2:

Build-Depends: libfuse-dev (>= 2.9.3-16)

Package: ntfs-3g
Pre-Depends:
 fuse [linux-any],
 fuse4bsd [kfreebsd-any],

Package: ntfs-3g-udeb
 fuse-udeb,

We should try rebuilding the package against fuse3 and see how it behaves. Upstream is active, but I don't see fuse3 being mentioned in the commit history or issue tracker.

I don't immediately see the reason for the Pre-Depends, I think we should check if that's actually needed or if it can be dropped. The dependency on bin:fuse is an issue as fuse3 Breaks: fuse, and we'll have other packages depending on bin:fuse3.

Parent bugs:
 - LP: #1934510
 - LP: #1956949

[Paride Legovini (paride)]

Debian has a much more up to date ntfs-3g and the Ubuntu delta is small, so we should also merge the package from Debian as we're touching it.

Also note that we may want to demote ntfs-3g to universe at some point, as Linux 5.15 shipped with a new and much improved r/w NTFS implementation [1].

FTR the ntfs-3g reverse-depends in main currently are:

Reverse-Recommends
* ubuntu-standard [amd64 arm64 armhf ppc64el s390x]
* udisks2

Reverse-Depends
* ntfs-3g-dev [amd64 arm64 armhf ppc64el s390x]
* ubiquity [amd64 arm64]
* ubuntu-server-minimal [amd64 arm64 armhf ppc64el s390x]

[1] https://kernelnewbies.org/Linux_5.15#New_NTFS_file_system_implementation

[Paride Legovini (paride)]

ntfs-3g 1:2017.3.23AR.3-3ubuntu6 just got uploaded with the bin:fuse dependencies updated to bin:fuse3, but this bug is still valid because of the build-depends on fuse2 we want to update.

I just test rebuilt 1:2017.3.23AR.3-3ubuntu5 against libfuse3-dev and it worked fine. TBH I don't even know if that's actually used at all, as the package is built with --with-fuse=internal, and I think that means the library under libfuse-lite/ (in the package itself) is used.

[Paride Legovini (paride)]

The package builds fine without the B-D on libfuse-dev.

[Sebastien Bacher (seb128)]

Speaking about merging, there is bug #1951239 waiting for sponsoring

> TBH I don't even know if that's actually used at all, as the package is built with --with-fuse=internal, and I think that means the library under libfuse-lite/ (in the package itself) is used.

Right, it seems the build-depends could simply be removed. The configure.ac doesn't know about fuse3.

[Paride Legovini (paride)]

I pointed Simon to this discussion so he can update the merge.

[Sebastien Bacher (seb128)]

I've reported the libfuse-dev depends being unneeded to Debian now, https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1003676 as well as 1003675 about switching to fuse3

[Paride Legovini (paride)]

Fix Released in 1:2021.8.22-3ubuntu1, see also LP: #1951239.