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fix(fs): use libuv for recursive cpSync to avoid VirtioFS EACCES #65547

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fix(fs): use libuv for recursive cpSync to avoid VirtioFS EACCES #65547

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fs: use libuv for recursive cpSync to avoid VirtioFS EACCES 
fs.cpSync() recursive copy fails EACCES on Docker VirtioFS bind
mounts. CopyDirRecursive()'s regular-file branch calls
std::filesystem::copy_file(), which libstdc++ implements by creating
dest with mode 0200 and then fchmod(). VirtioFS rejects that initial
0200 open with EACCES. The single-file cpSync path and the
fresh-destination branch of CopyDirRecursive() already avoid this by
using uv_fs_copyfile(), which opens dest with its final mode
directly.

Use uv_fs_copyfile() for the merge-into-existing-directory case too,
preserving force, errorOnExist and skip-existing semantics via
UV_FS_COPYFILE_EXCL and an existence check. Also drops the
file_copy_opts capture, now unused once the regular-file branch no
longer calls std::filesystem::copy_file().

Fixes: #65497
Signed-off-by: Jeremy Schoemaker <jeremy@shoemoney.com>
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@shoemoney
shoemoney committed Sep 9, 2026
commit 69470d16770a0491b23190aa678fdf8c2f94c63d
54 changes: 33 additions & 21 deletions src/node_file.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -4827,18 +4827,9 @@ CpError CopyDirRecursive(const std::filesystem::path& src_path,
}
}

auto file_copy_opts = std::filesystem::copy_options::recursive;
if (options.force) {
file_copy_opts |= std::filesystem::copy_options::overwrite_existing;
} else if (options.error_on_exist) {
file_copy_opts |= std::filesystem::copy_options::none;
} else {
file_copy_opts |= std::filesystem::copy_options::skip_existing;
}

std::function<CpError(std::filesystem::path, std::filesystem::path)>
copy_dir_contents;
copy_dir_contents = [&options, &copy_dir_contents, file_copy_opts](
copy_dir_contents = [&options, &copy_dir_contents](
std::filesystem::path src,
std::filesystem::path dest) -> CpError {
std::error_code error;
Expand Down Expand Up @@ -4989,20 +4980,41 @@ CpError CopyDirRecursive(const std::filesystem::path& src_path,
CpError fresh = CopyFileFresh(
dir_entry.path(), dest_file_path, options.copyfile_flags);
if (fresh.kind != CpError::kNone) return fresh;
} else if (!options.force && !options.error_on_exist &&
std::filesystem::exists(dest_file_path, error)) {
copied = false;
} else {
copied = std::filesystem::copy_file(
dir_entry.path(), dest_file_path, file_copy_opts, error);
// uv_fs_copyfile() instead of std::filesystem::copy_file():
// libstdc++ implements copy_file() by creating dest with mode
// 0200 and then fchmod(), which VirtioFS bind mounts reject
// with EACCES. uv_fs_copyfile() opens dest with the final mode
// directly, matching the single-file cpSync path.
error.clear();
auto src_str = ConvertPathToUTF8(dir_entry.path());
auto dest_file_str = ConvertPathToUTF8(dest_file_path);
uv_fs_t req;
auto cleanup = OnScopeLeave([&req]() { uv_fs_req_cleanup(&req); });
int flags = options.error_on_exist ? UV_FS_COPYFILE_EXCL : 0;
int rc = uv_fs_copyfile(nullptr,
&req,
src_str.c_str(),
dest_file_str.c_str(),
flags,
nullptr);
if (is_uv_error(rc)) {
if (rc == UV_EEXIST) {
return {CpError::kEexist,
0,
"cp",
SPrintF("[ERR_FS_CP_EEXIST]: Target already exists: "
"cp returned EEXIST (%s already exists)",
dest_file_path),
{}};
}
return CpError::Uv(rc, "cp", dest_file_str);
}
}
if (error) {
if (error == std::errc::file_exists) {
return {CpError::kEexist,
0,
"cp",
SPrintF("[ERR_FS_CP_EEXIST]: Target already exists: "
"cp returned EEXIST (%s already exists)",
dest_file_path),
{}};
}
return CpError::Std(error, dest_str);
}

Expand Down
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