Commit 2b0929929d67e222ca6a9523a3a594ed456c4a51 | zig

author	Andrew Kelley <andrew@ziglang.org> 2023-03-13 19:23:08-07:00
committer	Andrew Kelley <andrew@ziglang.org> 2023-03-15 10:48:15-07:00
log	2b0929929d67e222ca6a9523a3a594ed456c4a51
tree	27d50d65e7e55e07c609d42c7ce7db98170120a4
parent	bde12930939c50fbfa344c3701a01885e6dd06d4

std.Build.Cache: handle ENOENT on createFile race

There are no dir components, so you would think that this was
unreachable, however we have observed on macOS two processes racing
to do openat() with O_CREAT manifest in ENOENT.

1 files changed, 4 insertions(+), 1 deletions(-)

lib
- std
  - Build
    Cache.zig

lib/std/Build/Cache.zig+4-1

 @@ -439,7 +439,10 @@ pub const Manifest = struct {
                 self.manifest_file = manifest_file;
                 self.have_exclusive_lock = true;
             } else |err| switch (err) {
-                error.WouldBlock => {
+                // There are no dir components, so you would think that this was
+                // unreachable, however we have observed on macOS two processes racing
+                // to do openat() with O_CREAT manifest in ENOENT.
+                error.WouldBlock, error.FileNotFound => {
                     self.manifest_file = try self.cache.manifest_dir.openFile(&manifest_file_path, .{
                         .lock = .Shared,
                     });