builder/makepkg-chroot.sh

#!/usr/bin/env bash

# Config
chroot_base='/var/chroot/root'

# Functions
icat() {
	while read; do
		echo -e "$REPLY"
	done
}

build_script() {
	icat <<- EOF
		#!/bin/sh

		pacman -Sy &>pacman.log

		cd '/build'; chown builder:wheel /build
		sudo -u builder PKGDEST='/pkg' makepkg -s --noconfirm -L &>makepkg.log

		makepkg_exit="\$?"

		case "\$makepkg_exit" in
			0) echo 'ok';;
			3) echo 'already built';;
			*) echo 'FAIL';;
		esac

		exit "\$makepkg_exit"
	EOF
}

main() {
	chroot_dir="$1"
	pkg_dest_dir="$2"
	workdir="$PWD"

	[[ "${chroot_dir}" ]] || { usage; exit 1; }

	/usr/local/bin/mount-chroot.sh -s "$chroot_base" -n 'chroot_build' "$chroot_dir"

	mkdir -m777 "$chroot_dir/pkg" "$chroot_dir/build"

	mount --bind "$workdir" "$chroot_dir/build"
	mount --bind "$pkg_dest_dir" "$chroot_dir/pkg"

	build_script > "${chroot_dir}/build/build.sh"

	#chmod 755 "${chroot_dir}/build/build.sh"
	chroot "${chroot_dir}" sh /build/build.sh

	if /usr/local/bin/mount-chroot.sh -u "$chroot_dir"; then
		rm -r "${chroot_dir}"{,.work}
	else
		err "Cannot unmount $chroot_dir"
		exit 1
	fi
}

main "$@"