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ai slop #36955

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8d50ddf
install: tolerate concurrent installs racing on the same destination …
robobun Aug 5, 2026
b582f96
test: concurrent installs into the same destination tolerate racing h…
robobun Aug 5, 2026
7ee45be
install: keep the existing cache entry when a concurrent extract move…
robobun Aug 5, 2026
422ac38
install: retry transient ENOENT when a peer renames the destination d…
robobun Aug 5, 2026
f27a19b
test: cover cold-cache concurrent extraction in the racing installs test
robobun Aug 5, 2026
897335a
install: survive destination renames from concurrent installs on POSIX
robobun Aug 5, 2026
377f91e
[autofix.ci] apply automated fixes
autofix-ci[bot] Aug 5, 2026
b464718
Tighten comments
robobun Aug 5, 2026
6eb3a5a
install: probe package.json for tarball cache entries; assert file co…
robobun Aug 5, 2026
a3ff14f
install: retry racing destination-dir opens and stage the POSIX backoff
robobun Aug 5, 2026
c99bfd9
install: accept an already-identical link in the isolated linker
robobun Aug 5, 2026
9da7429
Allow unused mut on the Windows arm
robobun Aug 5, 2026
51da66d
install: recover from EINVAL for an unlinked destination dirfd on macOS
robobun Aug 5, 2026
06c4eae
install: symlink backend EEXIST retry must link to the cache target, …
robobun Aug 5, 2026
0907aac
install: give the macOS clonefile copy loop the same destination-rena…
robobun Aug 5, 2026
f6eadd8
[autofix.ci] apply automated fixes
autofix-ci[bot] Aug 5, 2026
d4b9960
install: propagate non-transient destination re-open errors
robobun Aug 5, 2026
9e99ab2
[autofix.ci] apply automated fixes
autofix-ci[bot] Aug 5, 2026
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190 changes: 158 additions & 32 deletions src/install/PackageInstall.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -614,7 +614,6 @@ impl HardLinkWindowsInstallTask {
}

fn run(&mut self) -> Option<crate::Error> {
use bun_sys::windows;
// Read scalar fields before borrowing `bytes` so no `&mut self` reborrow
// overlaps the slice borrows below.
let src_len = self.src_len;
Expand All @@ -626,6 +625,41 @@ impl HardLinkWindowsInstallTask {
let dest_len = dest.len() - 1;
debug_assert_eq!(dest[dest_len], 0);

// Peers installing the same package cause transient EBUSY (file
// briefly held open) and ENOENT (destination dir renamed aside by
// uninstall-before-install); retry with the same backoff
// extract_tarball uses for cache moves.
Comment thread
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const MAX_RETRIES: u32 = 4;
let mut retries: u32 = 0;
loop {
let err = match Self::link_or_copy(src, dest, dest_len, basename) {
None => return None,
Some(err) => err,
};
let transient = matches!(
err,
crate::Error::Sys(bun_errno::SystemErrno::EBUSY)
| crate::Error::Sys(bun_errno::SystemErrno::ENOENT)
);
if !transient || retries == MAX_RETRIES {
return Some(err);
}
retries += 1;
std::thread::sleep(std::time::Duration::from_millis(10u64 << (retries - 1)));
}
}

/// One attempt at materializing `dest` as a hard link of `src`, falling
/// back to a copy. A `dest` that already is the same file object as `src`
/// (a peer linked it first) is success, not a conflict.
Comment thread
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fn link_or_copy(
src: &[u16],
dest: &mut [u16],
dest_len: usize,
basename: usize,
) -> Option<crate::Error> {
use bun_sys::windows;

// `windows::CreateHardLinkW` is the safe wrapper (logs + Option<&mut SA>).
if windows::CreateHardLinkW(dest.as_ptr(), src.as_ptr(), None) != 0 {
return None;
Expand All @@ -635,13 +669,8 @@ impl HardLinkWindowsInstallTask {
windows::Win32Error::ALREADY_EXISTS
| windows::Win32Error::FILE_EXISTS
| windows::Win32Error::CANNOT_MAKE => {
// Race condition: this shouldn't happen
if cfg!(debug_assertions) {
bun_output::scoped_log!(
install,
"CreateHardLinkW returned EEXIST, this shouldn't happen: {}",
bun_core::fmt::fmt_path_u16(&dest[..dest_len], Default::default())
);
if windows::same_file_w(dest.as_ptr(), src.as_ptr()) {
return None;
}
// SAFETY: FFI — dest is a valid NUL-terminated u16 buffer.
unsafe { windows::DeleteFileW(dest.as_ptr()) };
Expand All @@ -662,6 +691,12 @@ impl HardLinkWindowsInstallTask {
return None;
}

// If the DeleteFileW above failed, dest may still be the link we
// want; CopyFileW onto it would copy the file over itself and fail.
Comment thread
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if windows::same_file_w(dest.as_ptr(), src.as_ptr()) {
return None;
}

if PackageManager::verbose_install() {
bun_core::run_once! {{
bun_core::warn!(
Expand Down Expand Up @@ -1568,7 +1603,27 @@ impl<'a> PackageInstall<'a> {

fn install_with_hardlink(&mut self, dest_dir: &Dir) -> crate::Result<InstallResult> {
let mut state = InstallDirState::default();
let res = self.init_install_dir(&mut state, dest_dir, Method::Hardlink);
#[cfg_attr(windows, allow(unused_mut))]
let mut res = self.init_install_dir(&mut state, dest_dir, Method::Hardlink);
// A peer installing the same package can rename the destination dir
// aside between our mkdir and open (uninstall-before-install);
// re-init rather than failing the package.
Comment thread
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#[cfg(not(windows))]
for _ in 0..4 {
match &res {
InstallResult::Failure(f)
if f.step == Step::OpeningDestDir
&& matches!(
f.err,
crate::Error::Sys(bun_errno::SystemErrno::ENOENT)
| crate::Error::FileNotFound
) => {}
_ => break,
}
std::thread::sleep(std::time::Duration::from_millis(5));
state = InstallDirState::default();
res = self.init_install_dir(&mut state, dest_dir, Method::Hardlink);
}
if res.is_fail() {
return Ok(res);
}
Expand All @@ -1582,12 +1637,24 @@ impl<'a> PackageInstall<'a> {
#[cfg(not(windows))]
type WinOffset = ();

#[cfg(windows)]
type PosixDirRef<'b> = ();
#[cfg(not(windows))]
type PosixDirRef<'b> = &'b Dir;
#[cfg(windows)]
type PosixZStrRef<'b> = ();
#[cfg(not(windows))]
type PosixZStrRef<'b> = &'b ZStr;

// Two overlapping slices into the same buffer (`head` is the whole
// buffer, `to_copy_into` is its tail) would be two live aliasing
// `&mut [u16]`, which is UB — pass head buffer + tail offset and
// reslice inside.
// reslice inside. `destbase`/`destpath` (posix) re-open
// `destination_dir` if a peer renames it away.
Comment thread
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fn copy(
destination_dir: &Dir,
destbase: PosixDirRef<'_>,
destpath: PosixZStrRef<'_>,
destination_dir: &mut Dir,
walker: &mut Walker,
to_copy_into1_offset: WinOffset,
head1: WinSlice<'_>,
Expand All @@ -1598,7 +1665,7 @@ impl<'a> PackageInstall<'a> {
#[cfg(not(windows))]
let _ = (to_copy_into1_offset, head1, to_copy_into2_offset, head2);
#[cfg(windows)]
let _ = destination_dir;
let _ = (destination_dir, destbase, destpath);
#[cfg(windows)]
let queue = HardLinkWindowsInstallTask::init_queue();
// on Windows, tasks already pushed to `queue` are running on
Expand Down Expand Up @@ -1626,7 +1693,7 @@ impl<'a> PackageInstall<'a> {
match entry.kind {
EntryKind::Directory => {
let _ = bun_sys::MakePath::make_path::<OSPathChar>(
destination_dir,
&*destination_dir,
entry.path.as_bytes(),
);
}
Expand All @@ -1644,24 +1711,79 @@ impl<'a> PackageInstall<'a> {
}
}

if let Err(err) = sys::linkat(
entry.dir,
entry.basename,
destination_dir.fd(),
entry.path,
) {
if err.get_errno() == sys::E::EEXIST {
let _ = sys::unlinkat(destination_dir, entry.path);
sys::linkat(
entry.dir,
entry.basename,
destination_dir.fd(),
entry.path,
)
.map_err(map_linkat_err)?;
} else {
// Peers installing the same package cause
// EEXIST (one already linked this file; same
// inode is success) and ENOENT (destination dir
// renamed aside by uninstall-before-install).
// Fix up and retry: first immediately (the
// single-process EEXIST case must not slow
// down), then with backoff to outlast a peer
// interfering more than once.
Comment thread
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const MAX_RETRIES: u32 = 6;
let mut retries: u32 = 0;
loop {
let err = match sys::linkat(
entry.dir,
entry.basename,
destination_dir.fd(),
entry.path,
) {
Ok(()) => break,
Comment thread
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Err(err) => err,
};
match err.get_errno() {
sys::E::EEXIST => {
if let (Ok(src), Ok(dest)) = (
sys::fstatat(entry.dir, entry.basename),
sys::fstatat(&*destination_dir, entry.path),
) {
if src.st_dev == dest.st_dev
&& src.st_ino == dest.st_ino
{
break;
}
}
let _ = sys::unlinkat(&*destination_dir, entry.path);
}
Comment thread
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// EINVAL: macOS reports it instead of
// ENOENT for a dirfd whose directory was
// unlinked.
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sys::E::ENOENT | sys::E::EINVAL => {
// The held fd may be an unlinked dir
// (peer renamed it aside and deleted
// it); re-open by path.
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if let Ok(reopened) = destbase.make_open_path(
destpath.as_bytes(),
OpenDirOptions {
iterate: true,
..Default::default()
},
) {
*destination_dir = reopened;
}
let entry_dirname = bun_paths::resolve_path::dirname::<
bun_paths::platform::Auto,
>(
entry.path.as_bytes()
);
if !entry_dirname.is_empty() {
let _ = bun_sys::MakePath::make_path::<OSPathChar>(
&*destination_dir,
entry_dirname,
);
}
}
_ => return Err(map_linkat_err(err)),
}
if retries == MAX_RETRIES {
return Err(map_linkat_err(err));
}
retries += 1;
if retries >= 3 {
std::thread::sleep(std::time::Duration::from_millis(
10u64 << (retries - 3),
));
}
}

real_file_count += 1;
Expand Down Expand Up @@ -1727,7 +1849,9 @@ impl<'a> PackageInstall<'a> {

#[cfg(windows)]
let result = copy(
&state.subdir,
(),
(),
&mut state.subdir,
state.walker.as_mut().unwrap(),
state.to_copy_buf_off,
&mut state.buf[..],
Expand All @@ -1736,7 +1860,9 @@ impl<'a> PackageInstall<'a> {
);
#[cfg(not(windows))]
let result = copy(
&state.subdir,
dest_dir,
self.destination_dir_subpath,
&mut state.subdir,
state.walker.as_mut().unwrap(),
(),
(),
Expand Down Expand Up @@ -1849,7 +1975,7 @@ impl<'a> PackageInstall<'a> {
}

let _ = sys::unlinkat(destination_dir, entry.path);
sys::symlinkat(entry.basename, destination_dir.fd(), entry.path)?;
sys::symlinkat(target, destination_dir.fd(), entry.path)?;
}

real_file_count += 1;
Expand Down
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