The mono and multi set copy publishers checked destination existence
with lstat and then called Node's rename, which replaces the target on
every platform (libuv passes MOVEFILE_REPLACE_EXISTING on Windows). A
file, symlink, or empty directory created between the check and the
rename was silently overwritten, and the identity confirmation could not
recover it because the publication record only proved the staged object
arrived. Claim the destination with mkdir — which fails with EEXIST if
anything occupies the path, so the claim itself is the existence check —
and move the staged children into the claim, restoring the source mode
on it. A failed child move relocates the children back and removes only
the claim. Covered for mono, multi, and simulated Windows, including an
injected concurrent creator at the claim instant.
玉澜
e8a320a06b