Add rudimentary network configuration support

diff --git a/templates/lxc-debian-unprivileged b/templates/lxc-debian-unprivileged
index d801b9d77ae7e637756c805e122c3b35fce629ef..9a3f248ffb95d411f65fe39a5cc6fad00c52cf15 100755 (executable)
--- a/templates/lxc-debian-unprivileged
+++ b/templates/lxc-debian-unprivileged
@@ -54,11 +54,40 @@ Required arguments:
 
 Optional arguments:
 [ -m | --mirror <mirrorurl> ]: The debian mirror to user
+[ -n | --network <networkspec> ]: How to configure networking
+
+Network spec:
+  <type>[,options]
+
+  type is one of:
+    dhcp4: v4 dhcp will be enabled.
+    dhcp6: v6 dhcp will be enabled.
+    dhcp: v4 and v6 dhcp will be enabled.
+    static: no dhcp will be enabled
+
+  options:
+    this is a , seperated list, and sets up static assignments for v4 or v6,
+    regardless of type.
+    The order of arguments is
+      staticv4/staticnetmask
+      staticv6/staticv6netmask
+      gateway
+      v6gateway
+
+  examples:
+
+    --network dhcp4 (default)
+    --network dhcp6 (v6 dhcp)
+    --network dhcp  (v4 and v6 dhcp)
+    --network dhcp4,,2001:db8:1234:5678::1/64 (dhcp4 and static v6 address)
+    --network static,,2001:db8:1234:5678::5/64,,fe80::1 (static v6)
+    --network static,192.0.2.15/24,,192.0.2.1 (static v4)
+
 EOF
     return 0
 }
 
-options=$(getopt -o r:m:h -l release:,mirror:,help,mapped-uid:,mapped-gid:,name:,path:,rootfs: -- "$@")
+options=$(getopt -o r:m:n:h -l release:,mirror:,network:,help,mapped-uid:,mapped-gid:,name:,path:,rootfs: -- "$@")
 
 if [ $? -ne 0 ]; then
     usage
@@ -69,6 +98,7 @@ eval set -- "$options"
 
 DEBIAN_MIRROR="http://mirror.mythic-beasts.com/debian/"
 DEBIAN_RELEASE="jessie"
+NETWORK_CONFIG=""
 
 disable_initscripts() {
     cat <<EOF > "${LXC_ROOTFS}/usr/sbin/policy-rc.d"
@@ -90,6 +120,7 @@ while :; do
         -h|--help)      usage && exit 1;;
         -r|--release)   DEBIAN_RELEASE="$2"; shift 2;;
         -m|--mirror)    DEBIAN_MIRROR="$2"; shift 2;;
+        -n|--network)   NETWORK_CONFIG="$2"; shift 2;;
         --mapped-uid)   MAPPED_UID="$2"; shift 2;;
         --mapped-gid)   MAPPED_GID="$2"; shift 2;;
         --name)         LXC_NAME="$2"; shift 2;;
@@ -99,6 +130,136 @@ while :; do
     esac
 done
 
+INTERFACE_DEFAULTS="auto eth0
+iface eth0 inet dhcp"
+
+generate_network_config() {
+    if [ "$NETWORK_CONFIG" == "" ]; then
+        echo "$INTERFACE_DEFAULTS"
+        return 0
+    fi
+
+    echo "auto eth0"
+    # see if there's a type
+    network_type=${NETWORK_CONFIG/,*}
+    other_params=${NETWORK_CONFIG#*,}
+
+    v4_configured=no
+    v6_configured=no
+
+    if [ "$network_type" == "dhcp" ]; then
+        echo "iface eth0 inet dhcp"
+        echo "iface eth0 inet6 dhcp"
+        v4_configured=yes
+        v6_configured=yes
+    elif [ "$network_type" == "dhcp4" ]; then
+        echo "iface eth0 inet dhcp"
+        v4_configured=yes
+    elif [ "$network_type" == "dhcp6" ]; then
+        echo "iface eth0 inet6 dhcp"
+        v6_configured=yes
+    elif [ "$network_type" != "static" ]; then
+        echo "Unknown network type: $network_type" 1>&2
+        echo 1>&2
+        usage 1>&2
+        exit 1
+    fi
+
+    [ "$network_type" == "$other_params" ] && return 0
+
+    v4_static=${other_params/,*}
+    other_params=${other_params#*,}
+
+    if [ "$v4_static" != "" ]; then
+        if [ "$v4_configured" == "yes" ]; then
+            echo "Both v4 DHCP and Static - giving up." 1>&2
+            echo 1>&2
+            usage 1>&2
+            exit 1
+        fi
+    fi
+
+    if [ "$v4_static" == "$other_params" ]; then
+        if [ "$v4_static" != "" ]; then
+            echo "iface eth0 inet static"
+            echo "  address $v4_static"
+        fi
+    fi
+
+    v6_static=${other_params/,*}
+    other_params=${other_params#*,}
+
+    if [ "$v6_static" != "" ]; then
+        if [ "$v6_configured" == "yes" ]; then
+            echo "Both v6 DHCP and Static - giving up." 1>&2
+            echo 1>&2
+            usage 1>&2
+            exit 1
+        fi
+    fi
+
+    if [ "$v6_static" == "$other_params" ]; then
+        if [ "$v4_static" ]; then
+            echo "iface eth0 inet static"
+            echo "  address $v4_static"
+            echo
+        fi
+
+        echo "iface eth0 inet6 static"
+        echo "  address $v6_static"
+
+        return 0
+    fi
+
+    v4_gateway=${other_params/,*}
+    other_params=${other_params#*,}
+
+    if [ "$v4_gateway" == "$other_params" ]; then
+        if [ "$v4_static" != "" ]; then
+            echo "iface eth0 inet static"
+            echo "  address $v4_static"
+            [ "$v4_gateway" != "" ] && echo "  gateway $v4_gateway"
+
+            if [ "$v6_static" != "" ]; then
+                echo "iface eth0 inet6 static"
+                echo "  address $v6_static"
+            fi
+
+            return 0
+        fi
+
+        if [ "$v4_configured" == "yes" ]; then
+            echo "DHCP and static gateway not supported, giving up." 1>&2
+            echo 1>&2
+            usage 1>&2
+            exit 1
+        fi
+    fi
+
+    v6_gateway=${other_params/,*}
+
+    if [ "$v4_static" != "" ]; then
+        echo "iface eth0 inet static"
+        echo "  address $v4_static"
+        [ "$v4_gateway" != "" ] && echo "  gateway $v4_gateway"
+        echo
+    fi
+
+    if [ "$v6_static" != "" ]; then
+        echo "iface eth0 inet6 static"
+        echo "  address $v6_static"
+        [ "$v6_gateway" != "" ] && echo "  gateway $v6_gateway"
+    fi
+
+    return 0
+}
+
+INTERFACE_DETAILS="$(generate_network_config)"
+
+# temporarily do something stupid
+echo "$INTERFACE_DETAILS"
+exit 1
+
 # rewrite the default config file
 
 sed -i -e "/lxc./{w ${LXC_PATH}/config-auto" -e "d}" "${LXC_PATH}/config"
@@ -236,10 +397,7 @@ if [ -e "${LXC_ROOTFS}/lib/systemd/system/systemd-journald-audit.socket" ]; then
     touch "${LXC_ROOTFS}/etc/systemd/system/systemd-journald-audit.socket"
 fi
 
-cat <<EOF >> "${LXC_ROOTFS}${NETWORK_FILE}"
-auto eth0
-iface eth0 inet dhcp
-EOF
+echo "$INTERFACE_DETAILS" >> "${LXC_ROOTFS}${NETWORK_FILE}"
 
 # and update to the latest security
 chroot "${LXC_ROOTFS}" apt-get update
@@ -265,6 +423,7 @@ enable_initscripts
 rm -r "${LXC_PATH}/bin"
 
 cat <<EOF
+
 You have successfully created a new debian container, ${LXC_NAME} running ${DEBIAN_RELEASE}.
 
 You should start the new container, and use:
@@ -276,6 +435,7 @@ To create a user account / set the root password.
 Note, by default, it's likely only to be the console that can login as root, so that'd be:
 
   lxc-console -n ${LXC_NAME} -t 0
+
 EOF
 
 exit 0