Support reproducible builds (except packages) #250
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See docker-library/official-images issue 16044 - `SOURCE_DATE_EPOCH` is added. The value is consumed by the build scripts to make the `httpd` binary reproducible. - GNU implementation of `wget` is executed with `--no-hsts` to disable creating `/root/.wget-hsts` - 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 PR 4576 Signed-off-by: Akihiro Suda <[email protected]>
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Background:
Alternative to:
SOURCE_DATE_EPOCHis added. The value is consumed by the build scripts to make thehttpdbinary reproducible.GNU implementation of
wgetis executed with--no-hststo disable creating/root/.wget-hstsFor Debian,
/var/log/*is removed as they contain timestampsFor Debian,
/var/cache/ldconfig/aux-cacheis 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/worldand/lib/apk/db/installedNote
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 v0.13.0-beta1 or later.To reproduce the base image by the hash, reproducers may:
FROMinstruction in Dockerfile manuallyCONVERTaction of source policies to replace the base image. https://github.com/moby/buildkit/blob/v0.13.0-beta1/docs/build-repro.mdTo reproduce Debian packages, reproducers may:
RUNinstructions in the Dockerfile to rewrite/etc/apt/sources.listto use http://snapshot.debian.org, and restore/etc/apt/sources.listat the end of the instruction (See the rejected PR Support reproducible builds for Debian #248)RUNinstructions (use cases: reproducible builds, cross-compilation, malware detection, ...) moby/buildkit#4576