MS coreutils: cp --reflink=always file1 file1_reflink1 returns "Not supported"

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
42/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Quiet
Tech stack
rust
Domain
cli, operating-systems

Research direction

Reproduce cp --reflink=always file1 file1_reflink1 on ReFS, WinBTRFS, or msnfs41client and trace the cp reflink handling in the Rust codebase. Determine why these filesystems return "Not supported" and identify the expected successful behavior before adding or updating a focused test.

Written by the indexing model from the issue text.

Description

C-bug

Microsoft coreutils:
cp --reflink=always file1 file1_reflink1 returns "Not supported", on ReFS, WinBTRFS and msnfs41client

Steps to reproduce

$ cp --reflink=always file1 file1_reflink1
cp: failed to clone 'file1_reflink1' from 'xxx': Not supported
Dominant language
Rust
Stars
5.2k
Forks
107
Avg merge
2d 19h
Merged PRs (30d)
4

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