[libvirt] [PATCH 08/10] configure: Add DHCPRELAY to the set of external program definitions

[TJ]

From: TJ <linux at iam.tj>

This variable should name the path to the system's DHCP relay daemon.

At this time the expected daemon is "dhcp-helper", a DHCP relay agent
from Simon Kelly, author of dnsmasq.

The supporting code, however, has been designed to work with any
suitable DHCP relay agent. Later patches could allow configuration
of the agent's command-line arguments.

Currently the chosen agent must support:

-b <bridge_interface> (the virtual network to listen on)
-i <physical_interface> (the interface to broadcast on)
-r </path/to/pid.file> (the PID file of the daemon)

Signed-off-by: TJ <linux at iam.tj>
---
 configure.ac | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/configure.ac b/configure.ac
index e3a749a..b62170e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -295,6 +295,8 @@ dnl External programs that we can use if they are available.
 dnl We will hard-code paths to these programs unless we cannot
 dnl detect them, in which case we'll search for the program
 dnl along the $PATH at runtime and fail if it's not there.
+AC_PATH_PROG([DHCPRELAY], [dhcp-helper], [dhcp-helper],
+	[/sbin:/usr/sbin:/usr/local/sbin:$PATH])
 AC_PATH_PROG([DNSMASQ], [dnsmasq], [dnsmasq],
 	[/sbin:/usr/sbin:/usr/local/sbin:$PATH])
 AC_PATH_PROG([RADVD], [radvd], [radvd],
@@ -314,6 +316,8 @@ AC_PATH_PROG([OVSVSCTL], [ovs-vsctl], [ovs-vsctl],
 AC_PATH_PROG([SCRUB], [scrub], [scrub],
 	[/sbin:/usr/sbin:/usr/local/sbin:$PATH])
 
+AC_DEFINE_UNQUOTED([DHCPRELAY], ["$DHCPRELAY"],
+	[Location or name of the dhcp relay-agent program])
 AC_DEFINE_UNQUOTED([DNSMASQ],["$DNSMASQ"],
         [Location or name of the dnsmasq program])
 AC_DEFINE_UNQUOTED([RADVD],["$RADVD"],
-- 
1.8.1.2.433.g9808ce0.dirty