rpi-i2c-1.0.0-r3.ebuild

# Copyright (c) 2017 sakaki <sakaki@deciban.com>
# License: GPL v3+
# NO WARRANTY

EAPI=6

KEYWORDS="~arm ~arm64"

DESCRIPTION="Service and udev rule to allow i2c group RPi I2C access"
HOMEPAGE="https://github.com/sakaki-/gentoo-on-rpi-64bit"
SRC_URI=""
LICENSE="GPL-3+"
SLOT="0"
IUSE="-systemd"
RESTRICT="mirror"

# required by Portage, as we have no SRC_URI...
S="${WORKDIR}"

ACCT_DEPEND="
	acct-group/i2c
"
DEPEND="
	${ACCT_DEPEND}
	!sys-apps/rpi3-i2cdev
	systemd?  ( >=sys-apps/systemd-242-r6 )
	!systemd? ( >=sys-apps/openrc-0.41 )
	>=virtual/udev-215
	>=app-shells/bash-4.0"
RDEPEND="${DEPEND}"

src_install() {
	insinto "/lib/udev/rules.d"
	doins "${FILESDIR}/99-i2c-group-access.rules"
	newinitd "${FILESDIR}/init.d_${PN}-2" "${PN}"
}

add_wheel_members_to_i2c_group() {
	local nextuser
	for nextuser in $(grep "^wheel:" /etc/group | cut -d: -f4 | tr "," " "); do
		usermod -a -G i2c ${nextuser}
	done
}

pkg_postinst() {
	if [[ -z ${REPLACING_VERSIONS} ]] ; then
		elog "Adding all members of wheel to the i2c group"
		add_wheel_members_to_i2c_group
		if ! grep -q "^\s*${PN}\s" <(rc-update show boot) &>/dev/null; then
			rc-update add "${PN}" boot
			elog "The ${PN} service has been added to your boot runlevel."
			elog "To activate, and use the I2C interface, please set:"
			elog "  dtparam=i2c_arm=on"
			elog "in /boot/config.txt, and reboot."
		fi
	fi
	if use systemd; then
		ewarn "You are running with the systemd USE flag set!"
		ewarn "However, this package does not yet formally support systemd, so"
		ewarn "you are on your own to get things working ><"
	fi
}