foundry / toolchain / musl / fetch.sh

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#!/usr/bin/env bash
# Download the musl release tarball into the download cache (default cache/)
# and check it against the SHA256 pinned in musl.sha256. Nothing downloaded
# is ever committed: cache/ is git-ignored.
#
# Offline? Put the tarball in cache/ yourself (any copy with the right
# SHA256 is fine), or set MUSL_TARBALL=/path/to/musl-1.2.5.tar.gz.
#
# Usage: toolchain/musl/fetch.sh [CACHE_DIR]
set -euo pipefail
HERE=$(cd "$(dirname "$0")" && pwd)
CACHE=${1:-cache}
mkdir -p "$CACHE"
read -r sum name < "$HERE/musl.sha256"
url=$(cat "$HERE/musl.url")
dest=$CACHE/$name
if [ -n "${MUSL_TARBALL:-}" ] && [ ! -f "$dest" ]; then cp "$MUSL_TARBALL" "$dest"; fi
if [ ! -f "$dest" ]; then
    echo "[musl] downloading $url"
    curl -fL --retry 3 -o "$dest.part" "$url" && mv "$dest.part" "$dest"
fi
if echo "$sum  $dest" | sha256sum -c --quiet -; then
    echo "[musl] $dest: SHA256 OK"
else
    echo "[musl] $dest: SHA256 MISMATCH -- delete it and try again"; exit 1
fi