45 lines
1.8 KiB
Bash
45 lines
1.8 KiB
Bash
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#!/bin/sh
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# SPDX-License-Identifier: GPL-3.0-only
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# SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
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# make-sysroot.sh — build an Alpine aarch64 sysroot for cross-compiling imsd.
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#
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# Downloads apk-tools-static + the Alpine signing keys from the CDN and
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# populates a minimal rootfs (musl, libc++, glib and their headers) that
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# clang can use via --sysroot. No root, no qemu, no device needed:
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#
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# packaging/make-sysroot.sh [dir] # default: ~/.cache/imsd/sysroot-aarch64-alpine
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# crafter-build --target=aarch64-alpine-linux-musl --sysroot=<dir>
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set -eu
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SYSROOT="${1:-$HOME/.cache/imsd/sysroot-aarch64-alpine}"
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MIRROR="${MIRROR:-https://dl-cdn.alpinelinux.org/alpine/edge}"
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ARCH=aarch64
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# gcc is in the list for its crtbeginS.o/libgcc: clang's driver for
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# *-alpine-linux-musl links against the GCC runtime it detects under
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# <sysroot>/usr/lib/gcc/<triple>/
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PKGS="musl-dev libc++ libc++-dev glib-dev compiler-rt llvm-libunwind-dev gcc"
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work=$(mktemp -d)
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trap 'rm -rf "$work"' EXIT
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fetch_pkg() { # $1 = repo (main/community), $2 = package name -> path on stdout
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file=$(curl -fsSL "$MIRROR/$1/x86_64/" |
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grep -o "href=\"$2-[0-9][^\"]*\.apk\"" | head -n1 | cut -d'"' -f2)
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[ -n "$file" ] || { echo "cannot find $2 in $MIRROR/$1" >&2; exit 1; }
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curl -fsSL -o "$work/$file" "$MIRROR/$1/x86_64/$file"
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echo "$work/$file"
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}
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echo ">> fetching apk-tools-static + alpine-keys"
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tar -xzf "$(fetch_pkg main apk-tools-static)" -C "$work" sbin/apk.static 2>/dev/null
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tar -xzf "$(fetch_pkg main alpine-keys)" -C "$work" usr/share/apk/keys 2>/dev/null
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echo ">> populating $SYSROOT ($ARCH: $PKGS)"
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mkdir -p "$SYSROOT"
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"$work/sbin/apk.static" \
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--arch "$ARCH" --root "$SYSROOT" --initdb --no-scripts --no-cache \
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--usermode --keys-dir "$work/usr/share/apk/keys/$ARCH" \
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-X "$MIRROR/main" -X "$MIRROR/community" \
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add $PKGS
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echo ">> done: $SYSROOT"
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