AltrootFS panics when file does not exist yet

[sffc]

Minimal repro:

let fs = vfs::altroot::AltrootFS::new("/tmp");
fs.path("dummy");

If /tmp/dummy does not exist on your filesystem, the above code panics here:

rust-vfs/src/altroot.rs

Line 57 in aa05dfd

full_path.canonicalize().unwrap();

It seems that canonicalize requires the path to exist, so if the file does not exist yet, then we panic.

I assume this is not the expected behavior, because I think calling .path is the one and only way to create a new file, but right now, AltrootFS panics before I can create the file.

[manuel-woelker]

Thanks for the bug report. Looks like this [1] is the root issue, AFAIC there is no clear alternative as of yet.

I am currently in the process of refactoring the API/traits [2], and I will keep this issue in mind when getting to the Altroot/Chroot implementation, and try to find a working solution.

[1] rust-lang/rust#59117
[2] https://github.com/manuel-woelker/rust-vfs/tree/fb-erased-fs-trait

[manuel-woelker]

@sffc I just released version 0.3.0, which has completely broken the API, but should fix the issue with path canonicalization.

If you want to take it for a spin and try it out, please let me know if this fixes the problem. Thanks!

[manuel-woelker]

Closing since this should be fixed now, please feel free to open a new issue if you have any further problems.