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Fix races on temporary file copies #616

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merged 3 commits into from
Oct 9, 2024

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sushain97
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When two instances of Bazelisk are running concurrently and downloading Bazel, the current code admits a race. This patch fixes the issue by using randomly named files for temporary paths.

For example:

{"error":"could not download Bazel: failed to download bazel: failed to move /root/.bazel_binaries/stripe-bazel/downloads/sha256/09bac5c11165a6ab0b7a90d6937c8bc3fcdcda662ffe0590e87ac2ae0e5e8978/bin/bazel.tmp to /root/.bazel_binaries/stripe-bazel/downloads/sha256/09bac5c11165a6ab0b7a90d6937c8bc3fcdcda662ffe0590e87ac2ae0e5e8978/bin/bazel: rename /root/.bazel_binaries/stripe-bazel/downloads/sha256/09bac5c11165a6ab0b7a90d6937c8bc3fcdcda662ffe0590e87ac2ae0e5e8978/bin/bazel.tmp /root/.bazel_binaries/stripe-bazel/downloads/sha256/09bac5c11165a6ab0b7a90d6937c8bc3fcdcda662ffe0590e87ac2ae0e5e8978/bin/bazel: no such file or directory"}

if err != nil {
return fmt.Errorf("failed to create temporary file in %s: %w", parent, err)
}
defer os.Remove(tmpFile.Name())
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This is a no-op unless the write fails and the rename never happens.

core/core.go Outdated Show resolved Hide resolved
@meteorcloudy meteorcloudy requested a review from fweikert October 1, 2024 14:59
@sushain97
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@fweikert 👋 anything I can help with to get this PR merged?

@fweikert
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fweikert commented Oct 9, 2024

Thank you!

@fweikert fweikert merged commit 2f239be into bazelbuild:master Oct 9, 2024
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@sushain97
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Hi, when should we expect a release with this change?

@fweikert
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Hi, when should we expect a release with this change?

https://github.com/bazelbuild/bazelisk/releases/tag/v1.22.1

@sushain97
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Thanks!

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3 participants