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docs: warn about gzip timestamps #979

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Nov 4, 2024
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docs: warn about gzip timestamps #979

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7 changes: 7 additions & 0 deletions docs/tar.md
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7 changes: 7 additions & 0 deletions lib/tar.bzl
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Expand Up @@ -15,6 +15,13 @@ We also provide full control for tar'ring binaries including their runfiles.
The `tar` binary is hermetic and fully statically-linked.
It is fetched as a toolchain from https://github.com/aspect-build/bsdtar-prebuilt.

## Important Note

When using `compress = "gzip"` its important to disable the non-deterministic time header by providing the `--options=gzip:!timestamp` option.

See: https://datatracker.ietf.org/doc/html/rfc1952#page-5
See: https://github.com/bazel-contrib/bazel-lib/issues/783

## Examples

See the [`tar` tests](/lib/tests/tar/BUILD.bazel) for examples of usage.
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