unable to process init request

[xujihui1985]

When downloading the release binary directly from GitHub, I'm unable to mount a simple daemon with version v2.2.5. The error message is as follows:

After debugging for a while, I discovered an undocumented feature fuse-t. According to the code, if the fuse-t feature is not enabled, it expects the fuse_init_extend flag to be set. This causes the initialization process to hang.

When I commented out this code, the daemon started normally.

reproduce

create a bootstrap and blob file from a local directory

nydus-image create -B image.boot -b image.blob ./glibc-2.28

start nydusd with newly created image.boot with localfs-dir

nydusd fuse -l trace -M ./testdir -B image.boot -D ./

[imeoer]

After offline discussion, we should make FsOptions::INIT_EXT optional.

[xujihui1985]

After offline discussion, we should make FsOptions::INIT_EXT optional.

I would like to take this PR if no one has been assigned

[xujihui1985]

it seems not trivial to toggle this options in runtime by extend a config object on Filesystem instance like this

  #[cfg(target_os = "linux")]
        if self.fs.enable_fuse_init {
          if flags_u64 & FsOptions::INIT_EXT.bits() != 0 {
              let InitIn2 { flags2, unused: _ } = ctx.r.read_obj().map_err(Error::DecodeMessage)?;
              flags_u64 |= (flags2 as u64) << 32;
          }
        }

as there is no way to extend the fs instance or self at this moment, as an alternative, we could add a new build feature like this, although I'm not quite happy this cfg approach

         #[cfg(all(target_os = "linux", feature="fuse_init_ext"))]
          if flags_u64 & FsOptions::INIT_EXT.bits() != 0 {
              let InitIn2 { flags2, unused: _ } = ctx.r.read_obj().map_err(Error::DecodeMessage)?;
              flags_u64 |= (flags2 as u64) << 32;
          }

what's your idea? @imeoer

[imeoer]

@xujihui1985 It seems that using feature to control the option is a bit heavy, whether we can add option as the param of Server::new ?
cc @jiangliu @bergwolf