nuageinit: add support for OpenStack network config

Add naive support for openstack network config.
if no config driver have been found, try to detect that we are running a
VM on openstack via the smbios information, use the first iface
available and temporary activate dhcp on it, to be able to fetch the
necessary informations for cloudinit.

While here make the rc script execute after devmatch, some ethernet
device might be attached via devmatch and may be needed for cloudinit.

Tested on OVHCloud Public Cloud.

MFC after:	3 weeks
Sponsored by:	OVHCloud

1 files changed, 37 insertions, 8 deletions

diff --git a/libexec/rc/rc.d/nuageinit b/libexec/rc/rc.d/nuageinit
index a44761ea1d9e..54e5b1fbec07 100755
--- a/libexec/rc/rc.d/nuageinit
+++ b/libexec/rc/rc.d/nuageinit
@@ -2,7 +2,7 @@
 #
 
 # PROVIDE: nuageinit
-# REQUIRE: mountcritlocal zfs
+# REQUIRE: mountcritlocal zfs devmatch
 # BEFORE: NETWORKING
 # KEYWORD: firstboot
 
@@ -14,6 +14,18 @@ start_cmd="nuageinit_start"
 stop_cmd=":"
 rcvar="nuageinit_enable"
 
+fetch_openstack()
+{
+	cd /media/nuageinit/openstack/latest
+	for file in meta_data.json network_data.json user_data; do
+		fetch http://169.254.169.254/openstack/latest/$file || :
+	done
+	if [ -f user_data ]; then
+		chmod 755 user_data
+	fi
+	cd -
+}
+
 nuageinit_start()
 {
 	local citype
@@ -34,13 +46,28 @@ nuageinit_start()
 		fi
 		unset drive
 	done
-	if [ -z "$drive" ]; then
-		# try to detect networked based instance
-		err 1 "Impossible to find a cloud init provider"
+	if [ -n "$drive" ]; then
+		mkdir -p /media/nuageinit
+		fs=$(fstyp $drive 2> /dev/null)
+		mount -t $fs $drive /media/nuageinit
+	else
+		product=$(kenv smbios.system.product)
+		case "$product" in
+		OpenStack*)
+			mkdir -p /media/nuageinit/openstack/latest
+			ifaces=$(ifconfig -l ether)
+			set -- $ifaces
+			dhclient -p /tmp/ephemeraldhcp.pid $1
+			fetch_openstack
+			pkill -F /tmp/ephemeraldhcp.pid
+			citype=config-2
+			;;
+		*)
+			# try to detect networked based instance
+			err 1 "Impossible to find a cloud init provider"
+			;;
+		esac
 	fi
-	mkdir -p /media/nuageinit
-	fs=$(fstyp $drive 2> /dev/null)
-	mount -t $fs $drive /media/nuageinit
 	# according to the specification, the content is either
 	# in the openstack or ec2 directory
 	case "$citype" in
@@ -59,8 +86,10 @@ nuageinit_start()
 	esac
 	if [ -n "$drive" ]; then
 		umount /media/nuageinit
+		rmdir /media/nuageinit
+	else
+		rm -rf /media/nuageinit
 	fi
-	rmdir /media/nuageinit
 }
 
 load_rc_config $name