Merge lp:~thumper/golxc/mockable into lp:golxc

[Tim Penhey]

Provide interfaces around the core parts.

In order to provide meaningful tests around code that is using golxc
without shelling out to real lxc commands, we need to depend only on
interfaces. The two main package level functions, New and List are
now methods on a ContainerFactory. The instances themselves implement
Container. Since this is now an interface, added methods for getting
and setting the log file and level.

Also, Create now takes a config file option. I found through trial
and error that if you specify a mount point in the config file, and
only pass that config file through at Start time, the mount
fails. However passing exactly the same config file through at Create
time, and not at Start time has it succeed.

[Tim Penhey (thumper)]

Please take a look.

[lp:~thumper/golxc/mockable]

7. By Tim Penhey on 2013-06-14

Add license files and headers.

[Tim Penhey (thumper)]

Also added license files and headers.

[Tim Penhey (thumper)]

Also, perhaps we could change ownership of trunk to ~juju-core?

[Ian Booth (wallyworld)]

Trivials:

English:
931 + // Clone creates a copy of the container, it gets the given name.
932 + Clone(name string) (Container, error)

Perhaps: // Clone creates a copy of the container, giving the copy the specified name.

962 + // LogLevel returns the current logging level, this is only used if the
963 + // LogFile is not "".
964 + LogLevel() LogLevel

Perhaps: // LogLevel returns the current logging level (only used if the LogFile is not "").

Also, some comments have "." at the end, others don't.

 +// ContainerFactory represents the methods used to create Containers.
971 +type ContainerFactory interface {
972 + // New returns a container instance which can then be used for operations
973 + // like Create(), Start(), Stop() or Destroy().
974 + New(string) Container
975 + List() ([]Container, error)
976 +}

Please add a comment for List(). I know there's one on the method implementation, but the interface is where you really want to see the comment.

review: Approve

[Tim Penhey (thumper)]

On 14/06/13 12:51, Ian Booth wrote:
> Review: Approve
>
> Trivials:
>
> English:
> 931 + // Clone creates a copy of the container, it gets the given name.
> 932 + Clone(name string) (Container, error)
>
> Perhaps: // Clone creates a copy of the container, giving the copy the specified name.

Done.

> 962 + // LogLevel returns the current logging level, this is only used if the
> 963 + // LogFile is not "".
> 964 + LogLevel() LogLevel
>
> Perhaps: // LogLevel returns the current logging level (only used if the LogFile is not "").
>
> Also, some comments have "." at the end, others don't.

I think they should be valid sentences.

> +// ContainerFactory represents the methods used to create Containers.
> 971 +type ContainerFactory interface {
> 972 + // New returns a container instance which can then be used for operations
> 973 + // like Create(), Start(), Stop() or Destroy().
> 974 + New(string) Container
> 975 + List() ([]Container, error)
> 976 +}
>
> Please add a comment for List(). I know there's one on the method implementation, but the interface is where you really want to see the comment.

Done.

[lp:~thumper/golxc/mockable]

8. By Tim Penhey on 2013-06-14

Comment fixes.

9. By Tim Penhey on 2013-06-14

Fix the tests.

[Frank Mueller (themue)]

In a discussion we decided to just wrap the needed LXC commands inside juju-core, but it's nice to see this package alive and with these good changes.

review: Approve

=== added file 'COPYING'
--- COPYING	1970-01-01 00:00:00 +0000
+++ COPYING	2013-06-14 03:35:36 +0000
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
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+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

=== added file 'COPYING.LESSER'
--- COPYING.LESSER	1970-01-01 00:00:00 +0000
+++ COPYING.LESSER	2013-06-14 03:35:36 +0000
@@ -0,0 +1,165 @@
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
+
+  A "Combined Work" is a work produced by combining or linking an
+Application with the Library.  The particular version of the Library
+with which the Combined Work was made is also called the "Linked
+Version".
+
+  The "Minimal Corresponding Source" for a Combined Work means the
+Corresponding Source for the Combined Work, excluding any source code
+for portions of the Combined Work that, considered in isolation, are
+based on the Application, and not on the Linked Version.
+
+  The "Corresponding Application Code" for a Combined Work means the
+object code and/or source code for the Application, including any data
+and utility programs needed for reproducing the Combined Work from the
+Application, but excluding the System Libraries of the Combined Work.
+
+  1. Exception to Section 3 of the GNU GPL.
+
+  You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+  2. Conveying Modified Versions.
+
+  If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
+facility is invoked), then you may convey a copy of the modified
+version:
+
+   a) under this License, provided that you make a good faith effort to
+   ensure that, in the event an Application does not supply the
+   function or data, the facility still operates, and performs
+   whatever part of its purpose remains meaningful, or
+
+   b) under the GNU GPL, with none of the additional permissions of
+   this License applicable to that copy.
+
+  3. Object Code Incorporating Material from Library Header Files.
+
+  The object code form of an Application may incorporate material from
+a header file that is part of the Library.  You may convey such object
+code under terms of your choice, provided that, if the incorporated
+material is not limited to numerical parameters, data structure
+layouts and accessors, or small macros, inline functions and templates
+(ten or fewer lines in length), you do both of the following:
+
+   a) Give prominent notice with each copy of the object code that the
+   Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the object code with a copy of the GNU GPL and this license
+   document.
+
+  4. Combined Works.
+
+  You may convey a Combined Work under terms of your choice that,
+taken together, effectively do not restrict modification of the
+portions of the Library contained in the Combined Work and reverse
+engineering for debugging such modifications, if you also do each of
+the following:
+
+   a) Give prominent notice with each copy of the Combined Work that
+   the Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the Combined Work with a copy of the GNU GPL and this license
+   document.
+
+   c) For a Combined Work that displays copyright notices during
+   execution, include the copyright notice for the Library among
+   these notices, as well as a reference directing the user to the
+   copies of the GNU GPL and this license document.
+
+   d) Do one of the following:
+
+       0) Convey the Minimal Corresponding Source under the terms of this
+       License, and the Corresponding Application Code in a form
+       suitable for, and under terms that permit, the user to
+       recombine or relink the Application with a modified version of
+       the Linked Version to produce a modified Combined Work, in the
+       manner specified by section 6 of the GNU GPL for conveying
+       Corresponding Source.
+
+       1) Use a suitable shared library mechanism for linking with the
+       Library.  A suitable mechanism is one that (a) uses at run time
+       a copy of the Library already present on the user's computer
+       system, and (b) will operate properly with a modified version
+       of the Library that is interface-compatible with the Linked
+       Version.
+
+   e) Provide Installation Information, but only if you would otherwise
+   be required to provide such information under section 6 of the
+   GNU GPL, and only to the extent that such information is
+   necessary to install and execute a modified version of the
+   Combined Work produced by recombining or relinking the
+   Application with a modified version of the Linked Version. (If
+   you use option 4d0, the Installation Information must accompany
+   the Minimal Corresponding Source and Corresponding Application
+   Code. If you use option 4d1, you must provide the Installation
+   Information in the manner specified by section 6 of the GNU GPL
+   for conveying Corresponding Source.)
+
+  5. Combined Libraries.
+
+  You may place library facilities that are a work based on the
+Library side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+   a) Accompany the combined library with a copy of the same work based
+   on the Library, uncombined with any other library facilities,
+   conveyed under the terms of this License.
+
+   b) Give prominent notice with the combined library that part of it
+   is a work based on the Library, and explaining where to find the
+   accompanying uncombined form of the same work.
+
+  6. Revised Versions of the GNU Lesser General Public License.
+
+  The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+  Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+  If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.

=== added file 'LICENSE'
--- LICENSE	1970-01-01 00:00:00 +0000
+++ LICENSE	2013-06-14 03:35:36 +0000
@@ -0,0 +1,15 @@
+golxc - Go package to interact with Linux Containers (LXC).
+
+Copyright 2012-2013, Canonical Ltd.
+
+This program is free software: you can redistribute it and/or modify it under
+the terms of the GNU Lesser General Public License as published by the Free
+Software Foundation, either version 3 of the License, or (at your option) any
+later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+
+See both COPYING and COPYING.LESSER for the full terms of the GNU Lesser
+General Public License.

=== modified file 'config.go'
--- config.go	2013-02-07 11:38:22 +0000
+++ config.go	2013-06-14 03:35:36 +0000
@@ -1,3 +1,6 @@
+// Copyright 2012, 2013 Canonical Ltd.
+// Licensed under the LGPLv3, see COPYING and COPYING.LESSER file for details.
+
 package golxc
 
 import (

=== modified file 'export_test.go'
--- export_test.go	2013-02-05 12:47:21 +0000
+++ export_test.go	2013-06-14 03:35:36 +0000
@@ -1,8 +1,11 @@
+// Copyright 2012, 2013 Canonical Ltd.
+// Licensed under the LGPLv3, see COPYING and COPYING.LESSER file for details.
+
 package golxc
 
 // ContainerHome returns the name of the container directory.
-func ContainerHome(c *Container) string {
-	return c.containerHome()
+func ContainerHome(c Container) string {
+	return c.(*container).containerHome()
 }
 
 // SetConfPath allows the manipulation of the LXC

=== modified file 'golxc.go'
--- golxc.go	2013-02-07 13:53:53 +0000
+++ golxc.go	2013-06-14 03:35:36 +0000
@@ -1,11 +1,10 @@
-//
+// Copyright 2012, 2013 Canonical Ltd.
+// Licensed under the LGPLv3, see COPYING and COPYING.LESSER file for details.
+
 // golxc - Go package to interact with Linux Containers (LXC).
 //
 // https://launchpad.net/golxc/
 //
-// Copyright (c) 2012 Canonical Ltd.
-//
-
 package golxc
 
 import (
@@ -59,52 +58,141 @@
 )
 
 // Container represents a linux container instance and provides
-// operations to create, maintain and destroy the container. 
-type Container struct {
+// operations to create, maintain and destroy the container.
+type Container interface {
+
+	// Name returns the name of the container.
+	Name() string
+
+	// Create creates a new container based on the given template.
+	Create(configFile, template string, templateArgs ...string) error
+
+	// Start runs the container as a daemon.
+	Start(configFile, consoleFile string) error
+
+	// Stop terminates the running container.
+	Stop() error
+
+	// Clone creates a copy of the container, giving the copy the specified name.
+	Clone(name string) (Container, error)
+
+	// Freeze freezes all the container's processes.
+	Freeze() error
+
+	// Unfreeze thaws all frozen container's processes.
+	Unfreeze() error
+
+	// Destroy stops and removes the container.
+	Destroy() error
+
+	// Wait waits for one of the specified container states.
+	Wait(states ...State) error
+
+	// Info returns the status and the process id of the container.
+	Info() (State, int, error)
+
+	// IsConstructed checks if the container image exists.
+	IsConstructed() bool
+
+	// IsRunning checks if the state of the container is 'RUNNING'.
+	IsRunning() bool
+
+	// String returns information about the container, like the name, state,
+	// and process id.
+	String() string
+
+	// LogFile returns the current filename used for the LogFile.
+	LogFile() string
+
+	// LogLevel returns the current logging level (only used if the
+	// LogFile is not "").
+	LogLevel() LogLevel
+
+	// SetLogFile sets both the LogFile and LogLevel.
+	SetLogFile(filename string, level LogLevel)
+}
+
+// ContainerFactory represents the methods used to create Containers.
+type ContainerFactory interface {
+	// New returns a container instance which can then be used for operations
+	// like Create(), Start(), Stop() or Destroy().
+	New(string) Container
+
+	// List returns all the existing containers on the system.
+	List() ([]Container, error)
+}
+
+// Factory provides the standard ContainerFactory.
+func Factory() ContainerFactory {
+	return &containerFactory{}
+}
+
+type container struct {
 	name     string
-	LogFile  string
-	LogLevel LogLevel
+	logFile  string
+	logLevel LogLevel
 }
 
-// New returns a container instance which can then be used for operations
-// like Create(), Start(), Stop() or Destroy().
-func New(name string) *Container {
-	return &Container{
-		name: name,
+type containerFactory struct{}
+
+func (*containerFactory) New(name string) Container {
+	return &container{
+		name:     name,
+		logLevel: LogWarning,
 	}
 }
 
-// List lists the existing containers on the system.
-func List() ([]*Container, error) {
+// List returns all the existing containers on the system.
+func (factory *containerFactory) List() ([]Container, error) {
 	out, err := run("lxc-ls", "-1")
 	if err != nil {
 		return nil, err
 	}
 	names := nameSet(out)
-	containers := make([]*Container, len(names))
+	containers := make([]Container, len(names))
 	for i, name := range names {
-		containers[i] = New(name)
+		containers[i] = factory.New(name)
 	}
 	return containers, nil
 }
 
 // Name returns the name of the container.
-func (c *Container) Name() string {
+func (c *container) Name() string {
 	return c.name
 }
 
+// LogFile returns the current filename used for the LogFile.
+func (c *container) LogFile() string {
+	return c.logFile
+}
+
+// LogLevel returns the current logging level, this is only used if the
+// LogFile is not "".
+func (c *container) LogLevel() LogLevel {
+	return c.logLevel
+}
+
+// SetLogFile sets both the LogFile and LogLevel.
+func (c *container) SetLogFile(filename string, level LogLevel) {
+	c.logFile = filename
+	c.logLevel = level
+}
+
 // Create creates a new container based on the given template.
-func (c *Container) Create(template string, tmplArgs ...string) error {
+func (c *container) Create(configFile, template string, templateArgs ...string) error {
 	if c.IsConstructed() {
 		return fmt.Errorf("container %q is already created", c.Name())
 	}
 	args := []string{
 		"-n", c.name,
 		"-t", template,
-		"--",
-	}
-	if len(tmplArgs) != 0 {
-		args = append(args, tmplArgs...)
+	}
+	if configFile != "" {
+		args = append(args, "-f", configFile)
+	}
+	args = append(args, "--")
+	if len(templateArgs) != 0 {
+		args = append(args, templateArgs...)
 	}
 	_, err := run("lxc-create", args...)
 	if err != nil {
@@ -114,7 +202,7 @@
 }
 
 // Start runs the container as a daemon.
-func (c *Container) Start(configFile, consoleFile string) error {
+func (c *container) Start(configFile, consoleFile string) error {
 	if !c.IsConstructed() {
 		return fmt.Errorf("container %q is not yet created", c.name)
 	}
@@ -128,8 +216,8 @@
 	if consoleFile != "" {
 		args = append(args, "-c", consoleFile)
 	}
-	if c.LogFile != "" {
-		args = append(args, "-o", c.LogFile, "-l", string(c.LogLevel))
+	if c.logFile != "" {
+		args = append(args, "-o", c.logFile, "-l", string(c.logLevel))
 	}
 	_, err := run("lxc-start", args...)
 	if err != nil {
@@ -139,15 +227,15 @@
 }
 
 // Stop terminates the running container.
-func (c *Container) Stop() error {
+func (c *container) Stop() error {
 	if !c.IsConstructed() {
 		return fmt.Errorf("container %q is not yet created", c.name)
 	}
 	args := []string{
 		"-n", c.name,
 	}
-	if c.LogFile != "" {
-		args = append(args, "-o", c.LogFile, "-l", string(c.LogLevel))
+	if c.logFile != "" {
+		args = append(args, "-o", c.logFile, "-l", string(c.logLevel))
 	}
 	_, err := run("lxc-stop", args...)
 	if err != nil {
@@ -157,11 +245,11 @@
 }
 
 // Clone creates a copy of the container, it gets the given name.
-func (c *Container) Clone(name string) (*Container, error) {
+func (c *container) Clone(name string) (Container, error) {
 	if !c.IsConstructed() {
 		return nil, fmt.Errorf("container %q is not yet created", c.name)
 	}
-	cc := &Container{
+	cc := &container{
 		name: name,
 	}
 	if cc.IsConstructed() {
@@ -179,7 +267,7 @@
 }
 
 // Freeze freezes all the container's processes.
-func (c *Container) Freeze() error {
+func (c *container) Freeze() error {
 	if !c.IsConstructed() {
 		return fmt.Errorf("container %q is not yet created", c.name)
 	}
@@ -189,8 +277,8 @@
 	args := []string{
 		"-n", c.name,
 	}
-	if c.LogFile != "" {
-		args = append(args, "-o", c.LogFile, "-l", string(c.LogLevel))
+	if c.logFile != "" {
+		args = append(args, "-o", c.logFile, "-l", string(c.logLevel))
 	}
 	_, err := run("lxc-freeze", args...)
 	if err != nil {
@@ -200,7 +288,7 @@
 }
 
 // Unfreeze thaws all frozen container's processes.
-func (c *Container) Unfreeze() error {
+func (c *container) Unfreeze() error {
 	if !c.IsConstructed() {
 		return fmt.Errorf("container %q is not yet created", c.name)
 	}
@@ -210,8 +298,8 @@
 	args := []string{
 		"-n", c.name,
 	}
-	if c.LogFile != "" {
-		args = append(args, "-o", c.LogFile, "-l", string(c.LogLevel))
+	if c.logFile != "" {
+		args = append(args, "-o", c.logFile, "-l", string(c.logLevel))
 	}
 	_, err := run("lxc-unfreeze", args...)
 	if err != nil {
@@ -221,7 +309,7 @@
 }
 
 // Destroy stops and removes the container.
-func (c *Container) Destroy() error {
+func (c *container) Destroy() error {
 	if !c.IsConstructed() {
 		return fmt.Errorf("container %q is not yet created", c.name)
 	}
@@ -236,7 +324,7 @@
 }
 
 // Wait waits for one of the specified container states.
-func (c *Container) Wait(states ...State) error {
+func (c *container) Wait(states ...State) error {
 	if len(states) == 0 {
 		return fmt.Errorf("no states specified")
 	}
@@ -253,7 +341,7 @@
 }
 
 // Info returns the status and the process id of the container.
-func (c *Container) Info() (State, int, error) {
+func (c *container) Info() (State, int, error) {
 	out, err := run("lxc-info", "-n", c.name)
 	if err != nil {
 		return StateUnknown, -1, err
@@ -268,7 +356,7 @@
 }
 
 // IsConstructed checks if the container image exists.
-func (c *Container) IsConstructed() bool {
+func (c *container) IsConstructed() bool {
 	fi, err := os.Stat(c.rootfs())
 	if err != nil {
 		return false
@@ -277,7 +365,7 @@
 }
 
 // IsRunning checks if the state of the container is 'RUNNING'.
-func (c *Container) IsRunning() bool {
+func (c *container) IsRunning() bool {
 	state, _, err := c.Info()
 	if err != nil {
 		return false
@@ -286,7 +374,7 @@
 }
 
 // String returns information about the container.
-func (c *Container) String() string {
+func (c *container) String() string {
 	state, pid, err := c.Info()
 	if err != nil {
 		return fmt.Sprintf("cannot retrieve container info for %q: %v", c.name, err)
@@ -295,13 +383,13 @@
 }
 
 // containerHome returns the name of the container directory.
-func (c *Container) containerHome() string {
+func (c *container) containerHome() string {
 	return "/var/lib/lxc/" + c.name
 }
 
 // rootfs returns the name of the directory containing the
 // root filesystem of the container.
-func (c *Container) rootfs() string {
+func (c *container) rootfs() string {
 	return c.containerHome() + "/rootfs/"
 }
 

=== modified file 'golxc_test.go'
--- golxc_test.go	2013-02-07 13:53:53 +0000
+++ golxc_test.go	2013-06-14 03:35:36 +0000
@@ -124,9 +124,11 @@
 	c.Assert(err, ErrorMatches, "open .*: no such file or directory")
 }
 
-type LXCSuite struct{}
+type LXCSuite struct {
+	factory golxc.ContainerFactory
+}
 
-var _ = Suite(&LXCSuite{})
+var _ = Suite(&LXCSuite{golxc.Factory()})
 
 func (s *LXCSuite) SetUpSuite(c *C) {
 	u, err := user.Current()
@@ -139,12 +141,12 @@
 
 func (s *LXCSuite) TestCreateDestroy(c *C) {
 	// Test clean creation and destroying of a container.
-	lc := golxc.New("golxc")
+	lc := s.factory.New("golxc")
 	c.Assert(lc.IsConstructed(), Equals, false)
 	home := golxc.ContainerHome(lc)
 	_, err := os.Stat(home)
 	c.Assert(err, ErrorMatches, "stat .*: no such file or directory")
-	err = lc.Create("ubuntu")
+	err = lc.Create("", "ubuntu")
 	c.Assert(err, IsNil)
 	c.Assert(lc.IsConstructed(), Equals, true)
 	defer func() {
@@ -160,38 +162,38 @@
 
 func (s *LXCSuite) TestCreateTwice(c *C) {
 	// Test that a container cannot be created twice.
-	lc1 := golxc.New("golxc")
+	lc1 := s.factory.New("golxc")
 	c.Assert(lc1.IsConstructed(), Equals, false)
-	err := lc1.Create("ubuntu")
+	err := lc1.Create("", "ubuntu")
 	c.Assert(err, IsNil)
 	c.Assert(lc1.IsConstructed(), Equals, true)
 	defer func() {
 		c.Assert(lc1.Destroy(), IsNil)
 	}()
-	lc2 := golxc.New("golxc")
-	err = lc2.Create("ubuntu")
+	lc2 := s.factory.New("golxc")
+	err = lc2.Create("", "ubuntu")
 	c.Assert(err, ErrorMatches, "container .* is already created")
 }
 
 func (s *LXCSuite) TestCreateIllegalTemplate(c *C) {
 	// Test that a container creation fails correctly in
 	// case of an illegal template.
-	lc := golxc.New("golxc")
+	lc := s.factory.New("golxc")
 	c.Assert(lc.IsConstructed(), Equals, false)
-	err := lc.Create("name-of-a-not-existing-template-for-golxc")
+	err := lc.Create("", "name-of-a-not-existing-template-for-golxc")
 	c.Assert(err, ErrorMatches, `error executing "lxc-create": No config file specified, .*`)
 	c.Assert(lc.IsConstructed(), Equals, false)
 }
 
-func (l *LXCSuite) TestDestroyNotCreated(c *C) {
+func (s *LXCSuite) TestDestroyNotCreated(c *C) {
 	// Test that a non-existing container can't be destroyed.
-	lc := golxc.New("golxc")
+	lc := s.factory.New("golxc")
 	c.Assert(lc.IsConstructed(), Equals, false)
 	err := lc.Destroy()
 	c.Assert(err, ErrorMatches, "container .* is not yet created")
 }
 
-func contains(lcs []*golxc.Container, lc *golxc.Container) bool {
+func contains(lcs []golxc.Container, lc golxc.Container) bool {
 	for _, clc := range lcs {
 		if clc.Name() == lc.Name() {
 			return true
@@ -202,18 +204,18 @@
 
 func (s *LXCSuite) TestList(c *C) {
 	// Test the listing of created containers.
-	lcs, err := golxc.List()
+	lcs, err := s.factory.List()
 	oldLen := len(lcs)
 	c.Assert(err, IsNil)
 	c.Assert(oldLen >= 0, Equals, true)
-	lc := golxc.New("golxc")
+	lc := s.factory.New("golxc")
 	c.Assert(lc.IsConstructed(), Equals, false)
-	c.Assert(lc.Create("ubuntu"), IsNil)
+	c.Assert(lc.Create("", "ubuntu"), IsNil)
 	c.Assert(lc.IsConstructed(), Equals, true)
 	defer func() {
 		c.Assert(lc.Destroy(), IsNil)
 	}()
-	lcs, _ = golxc.List()
+	lcs, _ = s.factory.List()
 	newLen := len(lcs)
 	c.Assert(newLen == oldLen+1, Equals, true)
 	c.Assert(contains(lcs, lc), Equals, true)
@@ -221,14 +223,14 @@
 
 func (s *LXCSuite) TestClone(c *C) {
 	// Test the cloning of an existing container.
-	lc1 := golxc.New("golxc")
+	lc1 := s.factory.New("golxc")
 	c.Assert(lc1.IsConstructed(), Equals, false)
-	c.Assert(lc1.Create("ubuntu"), IsNil)
+	c.Assert(lc1.Create("", "ubuntu"), IsNil)
 	c.Assert(lc1.IsConstructed(), Equals, true)
 	defer func() {
 		c.Assert(lc1.Destroy(), IsNil)
 	}()
-	lcs, _ := golxc.List()
+	lcs, _ := s.factory.List()
 	oldLen := len(lcs)
 	lc2, err := lc1.Clone("golxcclone")
 	c.Assert(err, IsNil)
@@ -236,7 +238,7 @@
 	defer func() {
 		c.Assert(lc2.Destroy(), IsNil)
 	}()
-	lcs, _ = golxc.List()
+	lcs, _ = s.factory.List()
 	newLen := len(lcs)
 	c.Assert(newLen == oldLen+1, Equals, true)
 	c.Assert(contains(lcs, lc1), Equals, true)
@@ -245,7 +247,7 @@
 
 func (s *LXCSuite) TestCloneNotCreated(c *C) {
 	// Test the cloning of a non-existing container.
-	lc := golxc.New("golxc")
+	lc := s.factory.New("golxc")
 	c.Assert(lc.IsConstructed(), Equals, false)
 	_, err := lc.Clone("golxcclone")
 	c.Assert(err, ErrorMatches, "container .* is not yet created")
@@ -253,9 +255,9 @@
 
 func (s *LXCSuite) TestStartStop(c *C) {
 	// Test starting and stopping a container.
-	lc := golxc.New("golxc")
+	lc := s.factory.New("golxc")
 	c.Assert(lc.IsConstructed(), Equals, false)
-	c.Assert(lc.Create("ubuntu"), IsNil)
+	c.Assert(lc.Create("", "ubuntu"), IsNil)
 	defer func() {
 		c.Assert(lc.Destroy(), IsNil)
 	}()
@@ -265,18 +267,18 @@
 	c.Assert(lc.IsRunning(), Equals, false)
 }
 
-func (l *LXCSuite) TestStartNotCreated(c *C) {
+func (s *LXCSuite) TestStartNotCreated(c *C) {
 	// Test that a non-existing container can't be started.
-	lc := golxc.New("golxc")
+	lc := s.factory.New("golxc")
 	c.Assert(lc.IsConstructed(), Equals, false)
 	c.Assert(lc.Start("", ""), ErrorMatches, "container .* is not yet created")
 }
 
-func (l *LXCSuite) TestStopNotRunning(c *C) {
+func (s *LXCSuite) TestStopNotRunning(c *C) {
 	// Test that a not running container can't be stopped.
-	lc := golxc.New("golxc")
+	lc := s.factory.New("golxc")
 	c.Assert(lc.IsConstructed(), Equals, false)
-	c.Assert(lc.Create("ubuntu"), IsNil)
+	c.Assert(lc.Create("", "ubuntu"), IsNil)
 	defer func() {
 		c.Assert(lc.Destroy(), IsNil)
 	}()
@@ -286,12 +288,12 @@
 func (s *LXCSuite) TestWait(c *C) {
 	// Test waiting for one of a number of states of a container.
 	// ATTN: Using a not reached state blocks the test until timeout!
-	lc := golxc.New("golxc")
+	lc := s.factory.New("golxc")
 	c.Assert(lc.IsConstructed(), Equals, false)
 	c.Assert(lc.Wait(), ErrorMatches, "no states specified")
 	c.Assert(lc.Wait(golxc.StateStopped), IsNil)
 	c.Assert(lc.Wait(golxc.StateStopped, golxc.StateRunning), IsNil)
-	c.Assert(lc.Create("ubuntu"), IsNil)
+	c.Assert(lc.Create("", "ubuntu"), IsNil)
 	defer func() {
 		c.Assert(lc.Destroy(), IsNil)
 	}()
@@ -301,11 +303,11 @@
 	c.Assert(lc.Wait(golxc.StateRunning), IsNil)
 }
 
-func (l *LXCSuite) TestFreezeUnfreeze(c *C) {
+func (s *LXCSuite) TestFreezeUnfreeze(c *C) {
 	// Test the freezing and unfreezing of a started container.
-	lc := golxc.New("golxc")
+	lc := s.factory.New("golxc")
 	c.Assert(lc.IsConstructed(), Equals, false)
-	c.Assert(lc.Create("ubuntu"), IsNil)
+	c.Assert(lc.Create("", "ubuntu"), IsNil)
 	defer func() {
 		c.Assert(lc.Destroy(), IsNil)
 	}()
@@ -320,36 +322,36 @@
 	c.Assert(lc.IsRunning(), Equals, true)
 }
 
-func (l *LXCSuite) TestFreezeNotStarted(c *C) {
+func (s *LXCSuite) TestFreezeNotStarted(c *C) {
 	// Test that a not running container can't be frozen.
-	lc := golxc.New("golxc")
+	lc := s.factory.New("golxc")
 	c.Assert(lc.IsConstructed(), Equals, false)
-	c.Assert(lc.Create("ubuntu"), IsNil)
+	c.Assert(lc.Create("", "ubuntu"), IsNil)
 	defer func() {
 		c.Assert(lc.Destroy(), IsNil)
 	}()
 	c.Assert(lc.Freeze(), ErrorMatches, "container .* is not running")
 }
 
-func (l *LXCSuite) TestFreezeNotCreated(c *C) {
+func (s *LXCSuite) TestFreezeNotCreated(c *C) {
 	// Test that a non-existing container can't be frozen.
-	lc := golxc.New("golxc")
+	lc := s.factory.New("golxc")
 	c.Assert(lc.IsConstructed(), Equals, false)
 	c.Assert(lc.Freeze(), ErrorMatches, "container .* is not yet created")
 }
 
-func (l *LXCSuite) TestUnfreezeNotCreated(c *C) {
+func (s *LXCSuite) TestUnfreezeNotCreated(c *C) {
 	// Test that a non-existing container can't be unfrozen.
-	lc := golxc.New("golxc")
+	lc := s.factory.New("golxc")
 	c.Assert(lc.IsConstructed(), Equals, false)
 	c.Assert(lc.Unfreeze(), ErrorMatches, "container .* is not yet created")
 }
 
-func (l *LXCSuite) TestUnfreezeNotFrozen(c *C) {
+func (s *LXCSuite) TestUnfreezeNotFrozen(c *C) {
 	// Test that a running container can't be unfrozen.
-	lc := golxc.New("golxc")
+	lc := s.factory.New("golxc")
 	c.Assert(lc.IsConstructed(), Equals, false)
-	c.Assert(lc.Create("ubuntu"), IsNil)
+	c.Assert(lc.Create("", "ubuntu"), IsNil)
 	defer func() {
 		c.Assert(lc.Destroy(), IsNil)
 	}()

=== modified file 'network.go'
--- network.go	2013-02-07 13:53:53 +0000
+++ network.go	2013-06-14 03:35:36 +0000
@@ -1,3 +1,6 @@
+// Copyright 2012, 2013 Canonical Ltd.
+// Licensed under the LGPLv3, see COPYING and COPYING.LESSER file for details.
+
 package golxc
 
 import (