docs: REPRODUCIBLE-BUILDS.md + refresh stale README/toolchain notes#2
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Document how the chain's builds are made byte-for-byte reproducible (and how CI and local are kept identical): pinned+aligned toolchain, SOURCE_DATE_EPOCH, locked deps, per-target static-linking rustflags, and the two path-embedding traps that broke it -- CARGO_HOME (/tmp vs /src) and rust-src sysroot paths -- both fixed with --remap-path-prefix. Includes the toolchain-bump procedure (update the /rustc/<hash> in the rust-src remap) and the CI==local verify steps. Also refresh notes that went stale when the global RUSTFLAGS moved to per-target config and stage1's toolchain was aligned to 1.91.1: the README image table and toolchain/target policy, and this file's own comment (dropped the "lockboot (1.91.0)" reference; stage0/stage1 are both 1.91.1 now). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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What
Adds a top-level
REPRODUCIBLE-BUILDS.mddescribing how the stage0 -> UKI chain is kept byte-for-byte reproducible, and refreshes README/toolchain notes that went stale with the recent build changes.REPRODUCIBLE-BUILDS.md covers
SOURCE_DATE_EPOCH,--locked, per-target static rustflags.--remap-path-prefixfixes: CARGO_HOME (/tmp/.cargoin CI vs/src/.cargolocal) and rust-src (rust-analyzer installs it locally; CI's clean toolchain doesn't → different std panic-location paths)./rustc/<hash>in the rust-src remap in both repos, or reproducibility silently regresses.gh run downloadthe CI artifacts, sha256linux.efi/stage2; Authenticode/path-canonical check for stage0's db-signedBOOTX64.EFI).Also
Refreshes now-stale notes caused by the merged work: the README image table said "static-musl RUSTFLAGS" (moved to per-target config) and "stage1 1.91.0" (now 1.91.1), and described the shared
.cargo/config.tomlas carrying musl link flags (it now carries only[env]). Fixed those + this file's own comment.Pairs with lockboot/stage0#9 and lockboot/stage1#18 (the reproducibility fixes themselves).
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