feat(ofs): introduce ofs execute bin

[oowl]

part of #3782

[oowl]

Now the ofs command running information as below

╰─$ ./target/debug/ofs --help
OpenDAL File System

Usage: ofs --mount-path <MOUNT_PATH> --backend <BACKEND>

Options:
  -m, --mount-path <MOUNT_PATH>  fuse mount path [env: OFS_MOUNT_PATH=]
  -b, --backend <BACKEND>        location of opendal service format: <scheme>://<host>:<port> example: s3://127.0.0.1:9000?access_key=xxx&secret_key=xxx [env: OFS_BACKEND=]
  -h, --help                     Print help
  -V, --version                  Print version
╭─ouyang@owl-home ~/code/opendal ‹feat/fuse●› 
╰─$ RUST_LOG=debug ./target/debug/ofs -b "fs://?root=/tmp" -m ./example  
[2024-01-20T12:22:45Z DEBUG opendal::services::fs::backend] backend build started: FsBuilder { root: Some("/tmp"), atomic_write_dir: None }
[2024-01-20T12:22:45Z DEBUG opendal::services::fs::backend] backend use root /tmp
[2024-01-20T12:22:45Z DEBUG opendal::services::fs::backend] backend build finished: FsBuilder { root: None, atomic_write_dir: None }
[2024-01-20T12:22:48Z DEBUG ofs] getattr(path=Some("/"))
[2024-01-20T12:22:48Z DEBUG ofs] getattr(path=Some("/"))
[2024-01-20T12:22:53Z DEBUG ofs] getattr(path=Some("/"))
[2024-01-20T12:22:53Z DEBUG ofs] getattr(path=Some("/"))
[2024-01-20T12:22:53Z DEBUG ofs] getattr(path=Some("/"))
[2024-01-20T12:22:53Z DEBUG ofs] getattr(path=Some("/"))
[2024-01-20T12:23:09Z DEBUG ofs] getattr(path=Some("/"))
[2024-01-20T12:23:09Z DEBUG ofs] getattr(path=Some("/"))

[oowl]

I will do another part about fuse implementation detail in the next PR.

[Xuanwo]

Now the ofs command running information as below

Comparing

ofs --mount-path /path/to/mount/path --backend "fs://?root=/tmp"

I prefer to have

ofs s3://bucket/root/path /mount/path

The required values are the backend path and mount path. Using positional arguments makes more sense to me.

[suyanhanx]

We may add some commands, like mount or unmount.
It won't provide only one function.

[Xuanwo]

We may add some commands, like mount or unmount.

Exit ofs should unmount the fs. We don't need to provide more commands for this application.

[oowl]

Now the ofs command as below

╰─$ ./target/debug/ofs --help      
Error: parse command line arguments

Caused by:
    OpenDAL File System
    
    Usage: ofs <MOUNT_PATH> <BACKEND>
    
    Arguments:
      <MOUNT_PATH>  fuse mount path [env: OFS_MOUNT_PATH=]
      <BACKEND>     location of opendal service format: <scheme>://?<key>=<value>&<key>=<value> example: fs://root=/tmp [env: OFS_BACKEND=]
    
    Options:
      -h, --help     Print help
      -V, --version  Print version

╰─$ RUST_LOG=debug ./target/debug/ofs ./exampless "fs://?root=/tmp"     
[2024-01-20T16:47:07Z DEBUG opendal::services::fs::backend] backend build started: FsBuilder { root: Some("/tmp"), atomic_write_dir: None }
[2024-01-20T16:47:07Z DEBUG opendal::services::fs::backend] backend use root /tmp
[2024-01-20T16:47:07Z DEBUG opendal::services::fs::backend] backend build finished: FsBuilder { root: None, atomic_write_dir: None }
[2024-01-20T16:47:09Z DEBUG ofs] getattr(path=Some("/"))

cc @Xuanwo

[Xuanwo]

Thank you! I have additional ideas for the UX of ofs, but I believe this PR is ready to be merged as is.

[oowl]

Thank you! I have additional ideas for the UX of ofs, but I believe this PR is ready to be merged as is.

We can talk about this in another issue.