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Jason Hempstead
2026-07-08 18:31:36 -04:00
parent 8b454163d7
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@@ -402,9 +402,8 @@ docker build --tag casjaysdev/rust:local .
| `build` | `apk-cache-<arch>` | Alpine package index and downloaded APKs |
| `build` | `rustup-downloads-<arch>` | rustup toolchain and component tarballs |
| `build` | `sccache-build-<arch>` | sccache compiled-artifact cache for the build stage |
| `rust-tools` | `cargo-registry-native` | Cargo registry index and crate tarballs (native) |
| `rust-tools` | `cargo-git-native` | Cargo git dependencies (native) |
| `rust-tools` | `sccache-native` | sccache cache for source-compiled tools in the native stage |
| `rust-tools` | `cargo-registry-native` | Cargo registry index (for cargo-binstall metadata) |
| `rust-tools` | `cargo-git-native` | Cargo git dependencies |
`<arch>` is `amd64` or `arm64`. Per-arch IDs prevent cross-arch cache
corruption in multi-platform builds.
@@ -539,27 +538,29 @@ BuildKit's own cache layer storage.
The `Dockerfile` uses the same `--platform=$BUILDPLATFORM` pattern as the
Go image's `go-tools` stage. A dedicated `rust-tools` stage runs natively on
the build host (always amd64 in CI) and cross-compiles or downloads all
~50 Rust tool binaries for the target arch before the main build stage ever
starts. This eliminates QEMU emulation for tool compilation:
the build host (always amd64 in CI) and downloads prebuilt tool binaries for
the target arch before the main build stage ever starts. This eliminates
QEMU emulation entirely for tool installation:
| How | What |
|-----|------|
| `cargo binstall --target <triple>` | Fetches prebuilt binaries from GitHub releases — no compilation |
| `cargo install --target <triple>` | Source-compiles natively on amd64 via the `musl-cross` toolchain |
| `sccache` (native x86_64) | Caches all source compilations across rebuilds |
| `cargo binstall --disable-strategies compile` | Fetches prebuilt binaries from GitHub releases — no compilation, tools without prebuilts are skipped |
Tools with C dependencies use pure-Rust alternatives wherever possible:
`rustls` instead of `native-tls`/OpenSSL (sqlx-cli, sea-orm-cli, trunk);
bundled SQLite via `rusqlite`'s `bundled` feature. `probe-rs` (needs libusb)
is best-effort: downloaded if a prebuilt exists, silently skipped otherwise.
bundled SQLite via `rusqlite`'s `bundled` feature.
**Note:** Some tools may be missing on `linux/arm64` if no prebuilt binary
exists for that architecture. Core tools (`just`, `cargo-nextest`, `sccache`,
`cargo-audit`, `cargo-deny`, `hyperfine`, `mdbook`, `dprint`, etc.) have
arm64 prebuilts; niche tools may be amd64-only.
**Expected multi-arch build times:**
| Arch | Before (QEMU) | After (native cross-compile) |
|------|---------------|------------------------------|
| `linux/amd64` | ~20 min | ~20 min |
| `linux/arm64` | ~15 hours | ~30–60 min |
| Arch | Before (QEMU) | After (prebuilt-only) |
|------|---------------|------------------------|
| `linux/amd64` | ~20 min | ~10–15 min |
| `linux/arm64` | ~15 hours | ~5–15 min |
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