hooks: add dhclient hooks

.gitignore

@@ -136,6 +136,8 @@ doc/manpage.refs
 doc/api/html/*
 
 hooks/unmount-namespace
+hooks/dhclient-start
+hooks/dhclient-stop
 
 m4/
 

configure.ac

@@ -889,6 +889,8 @@ AC_CONFIG_FILES([
 	doc/ko/see_also.sgml
 
 	hooks/Makefile
+	hooks/dhclient-start
+	hooks/dhclient-stop
 
 	templates/Makefile
 	templates/lxc-alpine

hooks/Makefile.am

@@ -5,6 +5,9 @@ hooks_SCRIPTS = \
 	clonehostname \
 	mountecryptfsroot \
 	ubuntu-cloud-prep \
+	dhclient-script \
+	dhclient-start \
+	dhclient-stop \
 	squid-deb-proxy-client
 
 binhooks_PROGRAMS = \

hooks/dhclient-start.in

+#! /bin/bash
+
+set -e
+
+LXC_HOOK_DIR="@LXCHOOKDIR@"
+
+rootfs="${LXC_ROOTFS_PATH##*:}"
+pidfile="${rootfs%/*}/dhclient.pid"
+
+mkdir -p "${rootfs}/var/lib/dhclient"
+
+nsenter -u -U -n -t "${LXC_PID}" -- \
+  /sbin/dhclient -nw -1 -pf ${pidfile} -lf ${rootfs}/var/lib/dhclient/dhclient.leases -e ROOTFS=${rootfs} -sf ${LXC_HOOK_DIR}/dhclient-script

hooks/dhclient-stop.in

+#! /bin/bash
+
+set -e
+
+LXC_HOOK_DIR="@LXCHOOKDIR@"
+
+rootfs="${LXC_ROOTFS_PATH##*:}"
+pidfile="${rootfs%/*}/dhclient.pid"
+
+# XXX Stop hook namespace arguments are wrong for some reason, those are the host namespaces not the container ones.
+# Retrieve the namespaces from the dhclient pidfile instead.
+nsenter -u -U -n -t $(< ${pidfile}) -- \
+  /sbin/dhclient -r -pf ${pidfile} -lf ${rootfs}/var/lib/dhclient/dhclient.leases -e ROOTFS=${rootfs} -sf ${LXC_HOOK_DIR}/dhclient-script
+
+rm -f ${pidfile}