#!/bin/sh
# SPDX-License-Identifier: AGPL-3.0-or-later
#
# Installs the wild linker (https://github.com/wild-linker/wild) into an Alpine
# builder image. Run as root from the Dockerfile, before it drops to `builder`.
#
# Why wild: linking beavershell is the single longest step of a rebuild, and it
# runs every time any crate changes. wild is much faster than both GNU ld (what
# the native images got by default) and lld (what the cross image used).
#
# Why the project's own release rather than `cargo install wild-linker`:
#   - The musl releases are built with the `mimalloc` feature. wild's
#     PACKAGING.md singles this out: musl's allocator is *much* worse than
#     glibc's for wild's allocation pattern, so a plain `cargo install` on
#     Alpine would give up a large part of the speedup we came for.
#   - They are built `--profile dist`, and static-pie, so the binary needs
#     nothing from the image and works in any of the three builders.
#   - No compile step, so the image stays cheap to rebuild.
#
# Alpine has no wild package, so this is out-of-band like rustup (see the note
# in packaging/alpine/APKBUILD.in about why neither is in makedepends).
#
# To bump: change VERSION and replace BOTH checksums. `uname -m` values match
# wild's asset names exactly, so no arch translation is needed.

set -e

VERSION=0.10.0

ARCH="$(uname -m)"
case "$ARCH" in
    x86_64)
        SHA256=2d920a6c21372026c1c2a7711c547b2da33708f93bcaae1da196151bdab69453 ;;
    aarch64)
        SHA256=49cfca01b10a4cd15ef4932687bef1708a052828875bc30f5124bb5085c23d40 ;;
    *)
        echo "install-wild.sh: no wild musl release for $ARCH" >&2
        exit 1 ;;
esac

NAME="wild-linker-${VERSION}-${ARCH}-unknown-linux-musl"
URL="https://github.com/wild-linker/wild/releases/download/${VERSION}/${NAME}.tar.gz"

cd /tmp
curl --proto '=https' --tlsv1.2 -sSfLO "$URL"
echo "${SHA256}  ${NAME}.tar.gz" | sha256sum -c -
tar -xzf "${NAME}.tar.gz"

install -Dm755 "${NAME}/wild" /usr/local/bin/wild
# `ld.wild` is what makes clang's -fuse-ld=wild work; wild's PACKAGING.md asks
# packagers to ship it.
ln -sf /usr/local/bin/wild /usr/local/bin/ld.wild
# A directory whose only entry is an `ld` symlink, for gcc. gcc grew
# -fuse-ld=wild only in 16.1 (Alpine 3.20 ships 13), so gcc callers pass
# -B/usr/local/lib/wild instead: gcc's linker search hits our `ld` first and
# finds crt objects, libgcc and everything else in its normal path, since that
# is the only file here.
install -d /usr/local/lib/wild
ln -sf /usr/local/bin/wild /usr/local/lib/wild/ld

rm -rf "${NAME}" "${NAME}.tar.gz"

# Fail the image build now rather than mid-link if the download was for the
# wrong arch or is otherwise unusable.
wild --version