SWPROT-8953: build: Add rootfs script

Origin: SiliconLabs/UnifySDK#50
Forwarded: #5
Signed-off-by: Philippe Coval <philippe.coval@silabs.com>

Author: rzr

scripts/build-rootfs.sh

@@ -0,0 +1,125 @@
+#! /usr/bin/env bash
+# -*- mode: Bash; tab-width: 2; indent-tabs-mode: nil; coding: utf-8 -*-
+# vim:shiftwidth=4:softtabstop=4:tabstop=4:
+# SPDX-License-Identifier: LicenseRef-MSLA
+# SPDX-FileCopyrightText: Silicon Laboratories Inc. https://www.silabs.com
+
+set -e
+set -x
+
+cat<<EOF
+Usage:
+
+ARCH=arm64 ./scripts/build-rootfs.sh
+EOF
+
+project="unifysdk"
+debian_suite="bookworm"
+
+# Can be overloaded from env eg: ARCH=arm64"
+target_debian_arch=${ARCH:="$(dpkg --print-architecture)"}
+
+debian_mirror_url="http://deb.debian.org/debian"
+sudo="sudo"
+machine="${project}-${debian_suite}-${target_debian_arch}-rootfs"
+rootfs_dir="/var/tmp/var/lib/machines/${machine}"
+MAKE="/usr/bin/make"
+CURDIR="$PWD"
+chroot="systemd-nspawn"
+packages="debootstrap \
+  binfmt-support \
+  debian-archive-keyring \
+  qemu-user-static \
+  systemd-container \
+  time \
+"
+case $target_debian_arch in
+    amd64)
+        export CMAKE_SYSTEM_PROCESSOR="x86_64"
+        export CARGO_TARGET_TRIPLE="${CMAKE_SYSTEM_PROCESSOR}-unknown-linux-gnu"
+        packages="${packages} qemu-system-x86"
+        qemu_system="qemu-system-${CMAKE_SYSTEM_PROCESSOR}"
+        ;;
+
+    arm64)
+        qemu_arch="aarch64"
+        qemu_system="qemu-system-${qemu_arch}"
+        export CMAKE_SYSTEM_PROCESSOR="${qemu_arch}"
+        export CARGO_TARGET_TRIPLE="${CMAKE_SYSTEM_PROCESSOR}-unknown-linux-gnu"
+        packages="${packages} qemu-system-arm"
+        ;;
+
+    *)
+        CMAKE_SYSTEM_PROCESSOR="$ARCH"
+        CARGO_TARGET_TRIPLE="${CMAKE_SYSTEM_PROCESSOR}-unknown-linux-gnu"
+        qemu_arch="${ARCH}"
+        qemu_system="qemu-system-${qemu_arch}"
+        echo "error: Not supported yet"
+
+        exit 1
+        ;;
+esac
+
+${sudo} apt-get update
+${sudo} apt install -y ${packages}
+if [ -e "/var/lib/binfmts/qemu-${qemu_arch}" ]; then
+    ${sudo} update-binfmts --enable "qemu-${qemu_arch}"
+fi
+qemu_file="/usr/bin/${qemu_system}"
+
+if [ ! -d "${rootfs_dir}" ] ; then
+    ${sudo} mkdir -pv "${rootfs_dir}"
+    time ${sudo} debootstrap \
+         --arch="${target_debian_arch}" \
+	       "${debian_suite}" "${rootfs_dir}" "${debian_mirror_url}"
+    ${sudo} chmod -v u+rX "${rootfs_dir}"
+fi
+
+# TODO: https://github.com/rust-lang/cargo/issues/8719#issuecomment-1516492970
+env_vars="$env_vars CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse"
+
+# TODO: https://github.com/rust-lang/cargo/issues/10583
+env_vars="$env_vars CARGO_NET_GIT_FETCH_WITH_CLI=true"
+
+cargo_dir="/tmp/$USER/${machine}/${HOME}/.cargo"
+${sudo} mkdir -pv  "${cargo_dir}"
+
+case ${chroot} in
+    "systemd-nspawn")
+        rootfs_shell="${sudo} systemd-nspawn \
+ --directory="${rootfs_dir}" \
+ --machine="${machine}" \
+ --bind="${CURDIR}:${CURDIR}" \
+ --bind="${cargo_dir}:/root/.cargo" \
+"
+        if [ -e "${qemu_file}" ] ; then
+            rootfs_shell="$rootfs_shell --bind ${qemu_file}"
+        fi
+        ;;
+    *)
+        rootfs_shell="${sudo} chroot ${rootfs_dir}"
+        l="dev dev/pts sys proc"
+        for t in $l ; do
+            $sudo mkdir -p "${rootfs_dir}/$t"
+            $sudo mount --bind "/$t" "${rootfs_dir}/$t"
+        done
+    ;;
+esac
+
+${rootfs_shell} \
+    apt-get install -y -- make sudo util-linux
+
+${rootfs_shell}	\
+    ${MAKE} \
+    --directory="${CURDIR}" \
+    --file="${CURDIR}/helper.mk" \
+    USER="${USER}" \
+    ${env_vars} \
+    -- \
+    help setup default \
+    target_debian_arch="${target_debian_arch}" \
+    CMAKE_SYSTEM_PROCESSOR="${CMAKE_SYSTEM_PROCESSOR}" \
+    CARGO_TARGET_TRIPLE="${CARGO_TARGET_TRIPLE}" \
+    # EoL
+
+sudo du -hs "/var/tmp/var/lib/machines/${machine}"