mirror of https://github.com/pulumi/pulumi.git
bae69f4c7c
diag.DefaultSink is not safe for concurrent use. Whether we use it with os.File or with a bytes.Buffer, both targets do not synchronize their writes, so this leaves room for interleaving of messages. Making diag.DefaultSink thread-safe is generally desirable, but is also a requirement for #12438 so that it can run upgrades concurrently and print warnings as tasks fail. This makes the result of DefaultSink thread-safe by adding a mutex around the targeted stdout and stderr. Note: As a special case, when stdout and stderr are the same we want to use the same mutex for them. This matches the behavior of [os/exec.Cmd][1] // If Stdout and Stderr are the same writer, and have a type that can // be compared with ==, at most one goroutine at a time will call Write. Stdout io.Writer Stderr io.Writer [1]: https://pkg.go.dev/os/exec#Cmd A writer implementation can be anything, and is not guaranteed to be comparable with `==`. When that happens, the `==` will panic. To prevent regressions, we have to handle that case and treat uncomparable writers as different. This is also similar to how os/exec does it: https://cs.opensource.google/go/go/+/refs/tags/go1.20.2:src/os/exec/exec.go;l=475 |
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