Fix incompatibility with LXC 3.0

LXC 3.0, unlike 2.1, doesn't support old configuration formats at all
and because our previous approach to handling old format was incomplete,
running `vagrant up` on a system with LXC 3.0 would fail, even if the
base box itself was made with modernized config.

This commit fixes this problem: is the box has a modern config, it's
going to be properly created and booted under LXC 3.0. It does so
without breaking the support for LXC < 2.1

lib/vagrant-lxc/action/boot.rb

@@ -8,11 +8,15 @@ module Vagrant
 
         def call(env)
           @env = env
-
+          driver = env[:machine].provider.driver
           config = env[:machine].provider_config
 
           utsname = env[:machine].config.vm.hostname || env[:machine].id
+          if driver.supports_new_config_format
+            config.customize 'uts.name', utsname
+          else
             config.customize 'utsname', utsname
+          end
 
           # Fix apparmor issues when starting Ubuntu 14.04 containers
           # See https://github.com/fgrehm/vagrant-lxc/issues/278 for more information
@@ -32,7 +36,7 @@ module Vagrant
           end
 
           env[:ui].info I18n.t("vagrant_lxc.messages.starting")
-          env[:machine].provider.driver.start(config.customizations)
+          driver.start(config.customizations)
 
           @app.call env
         end

lib/vagrant-lxc/action/create.rb

@@ -24,13 +24,17 @@ module Vagrant
             backingstore = config.privileged ? "best" : "dir"
           end
           driver = env[:machine].provider.driver
+          template_options = env[:lxc_template_opts]
+          if ! driver.supports_new_config_format
+            template_options['--oldconfig'] = ''
+          end
           driver.create(
             container_name,
             backingstore,
             config.backingstore_options,
             env[:lxc_template_src],
             env[:lxc_template_config],
-            env[:lxc_template_opts]
+            template_options
           )
           driver.update_config_keys
 

lib/vagrant-lxc/driver.rb

@@ -83,6 +83,7 @@ module Vagrant
         @cli.name = @container_name = name
 
         @logger.debug "Creating container..."
+
         @cli.create template_path, backingstore, backingstore_options, config_file, template_options
       end
 
@@ -214,6 +215,10 @@ module Vagrant
         @version ||= @cli.version
       end
 
+      def supports_new_config_format
+        Gem::Version.new(version) >= Gem::Version.new('2.1.0')
+      end
+
       # TODO: This needs to be reviewed and specs needs to be written
       def compress_rootfs
         # TODO: Pass in tmpdir so we can clean up from outside

lib/vagrant-lxc/driver/cli.rb

@@ -59,7 +59,7 @@ module Vagrant
             config_opts = ['-f', config_file]
           end
 
-          extra = template_opts.to_a.flatten
+          extra = template_opts.to_a.flatten.reject { |elem| elem.empty? }
           extra.unshift '--' unless extra.empty?
 
           run :create,

scripts/lxc-template

@@ -33,8 +33,10 @@ LXC_PATH=
 LXC_ROOTFS=
 LXC_TARBALL=
 LXC_CONFIG=
+LXC_USE_OLDCONFIG=
 LXC_STRIP_COMPONENTS=2
 
+
 usage() {
     cat <<EOF
 vagrant-lxc default template
@@ -44,6 +46,7 @@ Required arguments:
 
 Optional arguments:
 [ --config ]: Configuration file to be used when building the container
+[ --oldconfig ]: Use pre LXC 2.1 config format
 [ -h | --help ]: This help message
 
 LXC internal arguments (do not pass manually!):
@@ -57,7 +60,7 @@ EOF
     return 0
 }
 
-options=$(getopt -o h -l tarball:,config:,help:,name:,path:,rootfs:,mapped-uid:,mapped-gid:,strip-components: -- "$@")SS
+options=$(getopt -o h -l tarball:,config:,oldconfig,help:,name:,path:,rootfs:,mapped-uid:,mapped-gid:,strip-components: -- "$@")SS
 
 if [ $? -ne 0 ]; then
     usage $(basename $0)
@@ -70,6 +73,7 @@ do
     case "$1" in
         -h|--help)          usage $0 && exit 0;;
         --config)           LXC_CONFIG=$2; shift 2;;
+        --oldconfig)        LXC_USE_OLDCONFIG=1; shift 1;;
         --tarball)          LXC_TARBALL=$2; shift 2;;
         --name)             LXC_NAME=$2; shift 2;;
         --path)             LXC_PATH=$2; shift 2;;
@@ -144,7 +148,12 @@ if [ -e "${LXC_PATH}/config-auto" ]; then
     cat ${LXC_PATH}/config-auto >> ${LXC_PATH}/config
     rm ${LXC_PATH}/config-auto
 fi
-echo "lxc.utsname = ${LXC_NAME}" >> ${LXC_PATH}/config
+
+if [ $LXC_USE_OLDCONFIG ]; then
+    echo "lxc.utsname = ${LXC_NAME}" >> ${LXC_PATH}/config
+else
+    echo "lxc.uts.name = ${LXC_NAME}" >> ${LXC_PATH}/config
+fi
 
 ## Re-add the previously removed network config
 if [ -e "${LXC_PATH}/config-network" ]; then

spec/unit/driver_spec.rb

@@ -211,9 +211,9 @@ describe Vagrant::LXC::Driver do
           # Blah blah comment
           lxc.mount.entry = proc proc proc nodev,noexec,nosuid 0 0
           lxc.mount.entry = sysfs sys sysfs defaults  0 0
-          lxc.tty = 4
-          lxc.pts = 1024
-          lxc.rootfs = #{rootfs_path}
+          lxc.tty.max = 4
+          lxc.pty.max = 1024
+          lxc.rootfs.path = #{rootfs_path}
           # VAGRANT-BEGIN
           lxc.network.type=veth
           lxc.network.name=eth1
@@ -241,9 +241,9 @@ describe Vagrant::LXC::Driver do
           # Blah blah comment
           lxc.mount.entry = proc proc proc nodev,noexec,nosuid 0 0
           lxc.mount.entry = sysfs sys sysfs defaults  0 0
-          lxc.tty = 4
-          lxc.pts = 1024
-          lxc.rootfs = overlayfs:/path/to/master/directory:#{rootfs_path}
+          lxc.tty.max = 4
+          lxc.pty.max = 1024
+          lxc.rootfs.path = overlayfs:/path/to/master/directory:#{rootfs_path}
           # VAGRANT-BEGIN
           lxc.network.type=veth
           lxc.network.name=eth1