Added a comment

diff --git a/doc/todo/support_macOS__39___cp_-c___40__cp_--reflink_equivalent__41__/comment_12_9fd59c3ec54d54790050eb8860964783._comment b/doc/todo/support_macOS__39___cp_-c___40__cp_--reflink_equivalent__41__/comment_12_9fd59c3ec54d54790050eb8860964783._comment
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+[[!comment format=mdwn
+ username="Atemu"
+ avatar="http://cdn.libravatar.org/avatar/d1f0f4275931c552403f4c6707bead7a"
+ subject="comment 12"
+ date="2022-03-09T12:07:45Z"
+ content="""
+Problem is that in our Nix sandbox, `cp` is always coreutils' while on the actual system, it might be macOS'. 
+
+It'd be nice to have a way to declare what binary to use (with absolute path or just binary name) for `cp` and the like, that way we can get rid of our runtime wrapper that puts coreutils in git-annex' PATH in anticipation of features that rely on GNU coreutils.
+"""]]