std/fs/move should handle moving across mounts/devices

[kinghat]

Is your feature request related to a problem? Please describe.

currently you cannot use Deno.rename to move a file or directory across mounts/devices:

error: Uncaught (in promise) Error: Invalid cross-device link (os error 18)
await Deno.rename(src, dest);
^
at deno:core/01_core.js:106:46
at unwrapOpResult (deno:core/01_core.js:126:13)
at async Object.rename (deno:runtime/js/30_fs.js:172:5)
at async move (https://deno.land/std@0.102.0/fs/move.ts:33:3)

this is not the case with the mv command: mv uses cp(1) and rm(1)

Describe the solution you'd like

make Deno.rename match mv.

[ry]

Deno.rename maps onto a posix system call. We want to maintain the ability to make this low-level call.

I think we should have the functionality you describe but it belongs in std/fs/move.ts

I will transfer this issue back to deno_std and retitle it.

[lino-levan]

Are we okay with merging something that's not testable? I don't see how we could reasonably test moving accross mounts in CI.