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Support reproducible builds (except packages) #96

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Commits on Sep 19, 2024

  1. Support reproducible builds (except packages)

    See docker-library/official-images issue 16044
    
    - `SOURCE_DATE_EPOCH` is added.
      The value is consumed by the build scripts to make the binary reproducible.
    
    - `/tmp/*` is removed as they contain files created by `memcached`
    
    - For Debian, `/var/log/*` is removed as they contain timestamps
    
    - For Debian, `/var/cache/ldconfig/aux-cache` is removed as they contain inode numbers, etc.
    
    - For Alpine, virtual package versions are pinned to "0" to eliminate
      the timestamp-based version numbers that appear in `/etc/apk/world` and `/lib/apk/db/installed`
    
    > [!NOTE]
    > The following topics are NOT covered by this commit:
    >
    > - To reproduce file timestamps in layers, BuildKit has to be executed with
    >   `--output type=<TYPE>,rewrite-timestamp=true`.
    >   Needs BuildKit v0.13 or later.
    >
    > - To reproduce the base image by the hash, reproducers may:
    >   - modify the `FROM` instruction in Dockerfile manually
    >   - or, use the `CONVERT` action of source policies to replace the base image.
    >     <https://github.com/moby/buildkit/blob/v0.13.2/docs/build-repro.md>
    >
    > - To reproduce packages, see the `RUN` instruction hook proposed in
    >   moby/buildkit issue 4576
    
    Signed-off-by: Akihiro Suda <[email protected]>
    AkihiroSuda committed Sep 19, 2024
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