main/openrc: add firstboot service for installation through SSH

Currently this service serves the purpose of allowing Alpine
installation through SSH.

main/openrc/APKBUILD

@@ -2,7 +2,7 @@
 pkgname=openrc
 pkgver=0.35.5
 _ver=${pkgver/_git*/}
-pkgrel=1
+pkgrel=2
 pkgdesc="OpenRC manages the services, startup and shutdown of a host"
 url="https://gitweb.gentoo.org/proj/openrc.git"
 arch="all"
@@ -28,6 +28,7 @@ source="$pkgname-$pkgver.tar.gz::https://github.com/OpenRC/openrc/archive/$pkgve
 	networking.initd
 	modloop.confd
 	sysfsconf.initd
+	firstboot.initd
 	"
 builddir="$srcdir/$pkgname-$_ver"
 
@@ -94,4 +95,5 @@ b04058ec630e19de0bafefe06198dc1bff8c8d5d2c89e4660dd83dda8bb82a76cdb1d8661cce88e4
 27c036a2c07f658f7fb1e066c59dc494674ba0d81bcb85fea9caffec28ee537eb11e863e20aa4b1c88607f12496ac66d5b092c787c86ff8b8a80e423a8d99440  modloop.initd
 55df0ac13dac1f215f0c573ac07b150d31232a5204eccfc8941d5af73f91b4535a85d79b7f6514217038ecbe6bffa28cb83fd8d46fd4c596e07103deb8bc8a57  networking.initd
 80e43ded522e2d48b876131c7c9997debd43f3790e0985801a8c1dd60bc6e09f625b35a127bf225eb45a65eec7808a50d1c08a5e8abceafc61726211e061e0a2  modloop.confd
-d76c75c58e6f4b0801edac4e081b725ef3d50a9a8c9bbb5692bf4d0f804af7d383bf71a73d5d03ed348a89741ef0b2427eb6a7cbf5a9b9ff60a240639fa6ec88  sysfsconf.initd"
+d76c75c58e6f4b0801edac4e081b725ef3d50a9a8c9bbb5692bf4d0f804af7d383bf71a73d5d03ed348a89741ef0b2427eb6a7cbf5a9b9ff60a240639fa6ec88  sysfsconf.initd
+baee47a6288108e35d78f47873885111fb4fee9fc690c58d0bfb0385b9796d0879b99449c909dbe5b1921733354a85698e92bb5c08f9e4ea6f031b00e86a0240  firstboot.initd"

main/openrc/firstboot.initd

@@ -0,0 +1,44 @@
+#!/sbin/openrc-run
+
+# The first boot init service
+
+# read kernel options
+init_KOPT() {
+	for opt in $(cat /proc/cmdline 2>/dev/null); do
+		case "$opt" in
+			ssh_*=*)
+				eval "KOPT_${opt%%=*}='${opt#*=}'" ;;
+		esac
+	done
+}
+
+depend() {
+	keyword -vserver -lxc
+	init_KOPT
+	[ -n "$KOPT_ssh_key" ] && need sshd
+	[ -n "$KOPT_ssh_pass" ] && use sshd
+}
+
+
+start() {
+	init_KOPT
+	local rc=0
+	ebegin "Starting ${RC_SVCNAME}"
+	if [ -n "$KOPT_ssh_key" ] && [ ! -f "/root/.ssh/authorized_keys" ]; then
+		einfo "Fetching ssh keys"
+		mkdir -pm 700 /root/.ssh
+		case "$KOPT_ssh_key" in
+			http://*|https://*|ftp://*|ftps://*)
+				wget -q "$KOPT_ssh_key" -O /root/.ssh/authorized_keys
+				rc=$?;;
+			*) echo "$KOPT_ssh_key" > /root/.ssh/authorized_keys;;
+		esac
+		chmod 600 /root/.ssh/authorized_keys
+	fi
+	if [ -n "$KOPT_ssh_pass" ]; then
+		echo "root:$KOPT_ssh_pass" | /usr/sbin/chpasswd
+		command_args="-o PermitRootLogin=yes" rc-service sshd start --quiet
+	fi
+	eend $rc
+}
+