27e8675277
Make the role_name in the task its own field for use in the callback
2013-09-20 15:46:34 -05:00
c24f6f438b
Avoid ugly formatting due to a long if statement
2013-09-06 22:37:17 -07:00
a075ec9831
Bug fix for a crash, when any_errors_fatal is true
...
Reported by Rumen:
TASK: [fail FAIL] *************************************************************
skipping: [hostname.com]
failed: [hostname.com] => {"failed": true}
msg: Failed as requested from task
Traceback (most recent call last):
File "/usr/local/bin/ansible-playbook", line 268, in <module>
sys.exit(main(sys.argv[1:]))
File "/usr/local/bin/ansible-playbook", line 208, in main
pb.run()
File "/Library/Python/2.7/site-packages/ansible/playbook/__init__.py", line 262, in run
if not self._run_play(play):
File "/Library/Python/2.7/site-packages/ansible/playbook/__init__.py", line 580, in _run_play
if (hosts_count - len(host_list)) > int((play.max_fail_pct)/100.0 * hosts_count):
TypeError: object of type 'NoneType' has no len()
2013-09-04 18:30:33 -07:00
d05c61d1f0
Merge branch 'devel' into fireball2
...
Conflicts:
lib/ansible/playbook/__init__.py
lib/ansible/playbook/play.py
2013-09-02 21:54:02 -05:00
637d3070dc
Allow default variables to be overridden by inventory variables
2013-08-29 17:21:28 -05:00
959138d00d
Added accelerate_port to plays, and made it configurable
2013-08-28 11:14:58 -05:00
167f185092
Initial support for running gather_facts through fireball2
2013-08-28 11:14:58 -05:00
521e14a3ad
Fireball2 mode working!
2013-08-28 11:14:58 -05:00
4cee6a5435
Add option remote_user to task level, to specify the ssh login user
2013-08-23 23:20:13 +02:00
ed3e4aff84
Place retry file in the user's home dir instead of /var/lib/tmp
...
Addresses CVE-2013-4260: predictable filename used for failed results
in world writable directory.
2013-08-21 11:40:46 -05:00
3f247fcbe3
fixes ansible/ansible#3609 Add max_fail_pct to playbook parameter, to complement serial option, So if total number of failures execeed max_fail_pct * total number of hosts, do not go to the next serial batch
2013-08-20 13:55:22 -05:00
e3adfbf5f8
Add tests for undefined variable detection
...
Tests `test_playbook_undefined_varsX_fail` check if ansible detects
undefined variables when `error_on_undefined_vars` is enabled. These
tests fail without "Improve behavior with error_on_undefined_vars
enabled" patch.
Tests `test_playbook_undefined_varsX_ignore` check if ansible ignores
undefined variables when `error_on_undefined_vars` is disabled.
Also modify PlayBook._run_task_internal() so error_on_undefined_vars is
testable.
2013-08-20 00:40:49 -05:00
e8272e365d
implemented 'inventory_file' variable. Closes GH-3789.
2013-08-10 13:04:56 +02:00
ceff3b6ba3
Minor modification to set_fact with_items patch
...
Previous patch was reverted due to the fact that there was an issue
with the results not always being a dictionary (they're sometimes
a unicode string, ie. when the with_items is used with yum). This
minor change corrects that by checking for a dict object.
2013-08-09 07:52:14 -05:00
8be2fc745b
Revert "Check for ansible_facts in results for with_ tasks"
...
This reverts commit 1a4e6e415e
2013-08-08 20:32:30 -05:00
1a4e6e415e
Check for ansible_facts in results for with_ tasks
...
that loop over a lookup plugin. Fixes #3704 and #3735
2013-08-08 12:30:32 -05:00
6ba4331161
Correctly check for failed status from an async task. Use runner_on_async_failed callback (instead of runner_on_failed) when an async task times out. Add runner_on_async_ok callback when a task is started in fire and forget mode.
2013-08-06 12:42:44 -04:00
56a00e0667
Remove dead code.
2013-08-05 16:13:50 -04:00
dec43f7a2b
PEP8 indent fix.
2013-08-03 14:54:37 -04:00
841093921b
Add extra module path early during playbook parsing.
...
This should fix issue #3668
Also prevent an extra module path to be added multiple times.
2013-07-28 18:47:26 +02:00
88720516a1
Merge branch 'changed_when' of git://github.com/stoned/ansible into changed_when
2013-07-21 10:14:03 -04:00
f592340f7f
Merge branch 'playbook-skip-tags' of git://github.com/dekked/ansible into skip_tags
2013-07-21 09:43:23 -04:00
0f4229f6c4
Merge pull request #3462 from stoned/filtererror
...
Introduce exception AnsibleFilterError and use it in Jinja filters. Ign...
2013-07-20 09:12:26 -07:00
4a732c1e9f
Enabled the use of extra vars in playbook file paths when including playbooks from other playbooks.
2013-07-18 22:45:18 +02:00
04349ec362
Added --skip-tags option to ansible-playbook.
2013-07-16 19:43:58 -03:00
eb45f07ae3
Introduce 'changed_when' keyword to override a task's changed status with the evaluation of a Jinja2 expression
2013-07-14 21:07:45 +02:00
2d88c70cd5
Introduce exception AnsibleFilterError and use it in Jinja filters. Ignore this exception when trying to find the name of a task for display (callback) purpose.
2013-07-07 19:18:32 +02:00
2a7f9df109
add support for callback_plugins/ relative to playbook
2013-06-12 23:54:00 +02:00
3f17a39238
Set current play/task to None for callback context when finished running the current play/task.
2013-06-09 12:17:57 -04:00
4d24faeeb1
Fix grammatical error in error message
2013-05-13 13:22:57 +02:00
a81089231e
Register skipped tasks so we can at least check their changed/not-changed status.
2013-04-28 10:13:58 -04:00
5af271911b
Fix duplicate handler notification issue in 1.2 devel
2013-04-25 21:24:15 -04:00
21fe750cef
Flush handlers before pre and post task sections change, but not between task and roles, as this seems
...
to be confusing to people (and not usually neccessary)
2013-04-24 22:28:06 -04:00
6fdfbb1a34
Improve variable smushing so it only has to be done in one place. This is related to shlex.split being called
...
on untemplated variables in some rare cases.
2013-04-24 22:00:40 -04:00
6c778acd91
Smush the braces in various places (hey, that rhymes) to avoid undo key=value splitting surprises
...
in new template system.
2013-04-22 22:05:06 -04:00
3e0c33c1fa
Empty plays should still gather facts
2013-04-21 17:35:09 -04:00
747c7f0dff
handlers must be run once
...
so remove all occurences of each host from the handlers notified by
lists
2013-04-21 17:23:13 +02:00
32fb6c807c
Allow handlers to run in between pre_tasks, roles, tasks, and post_tasks.
2013-04-20 18:03:03 -04:00
53ac0bbec2
Instantiate callback plugins only once so we can set play/task objects on them and they'll stick.
2013-04-20 09:09:35 -04:00
d8bf87b008
(A) include errors in inventory scripts should they occur.
...
(B) allow registration with ignore_errors: True
2013-04-17 22:27:00 -04:00
b09ef21ec9
Add code to flag legacy templating like $foo.{bar} as deprecated in favor of Jinja2 {{ foo.bar }} so we
...
can remove the legacy system at a later date.
2013-04-10 17:52:35 -04:00
29209c4913
Style fixes so "make pep8" is clean.
2013-04-10 16:37:49 -04:00
c5d9823467
Fix some items related to playbook includes and indentation.
2013-04-10 15:04:41 -04:00
290780d13f
Playbook + with_items was an undocumented feature that was causing problems because it would
...
evaluate and replace '$item' with ''. Really it doesn't make sense to include multiple playbooks
via a loop variable, as you can do this with task + with_items already (and it's a simpler code
path). Given this is undocumented, this removes that feature, and we'll consider next how to
also add 'with_items' support directly to roles.
2013-04-09 20:13:55 -04:00
c64f19dc5f
Don't set the item variable as eager template replacement will over-replace the variable as an empty string.
2013-04-09 19:57:53 -04:00
61f2668b0a
Don't include the '.yml' in the path to the retry files.
2013-04-08 12:38:05 -04:00
0d530f3bf0
Change the retry logic to write a limit file, able to source limit from files by indicating with @filename
2013-04-08 12:36:01 -04:00
c695aa2d6a
When playbooks fail, attempt to create an inventory file in the inventory directory that allows rerunning
...
of the playbook against only the hosts that failed.
2013-04-07 23:37:10 -04:00
b874027b36
compare the number of available hosts before and after running each task
2013-03-29 13:13:22 +09:00
20a48c6bdf
terminate immediately on a failure
2013-03-28 15:17:01 +09:00
42b0e51223
Upgrade callbacks further, now '.play', '.task', and so on are also available!
2013-03-25 22:56:32 -04:00
0d11f53eff
Let the callbacks see the playbook and (current) runner objects.
2013-03-25 22:47:06 -04:00
783a12cc0e
Resolve merge commit.
2013-03-25 22:32:01 -04:00
7687c2caf8
add --step option to ansible-playbooks to let people step through a playbook
...
one by one - asking for confirmation along the way.
also allows to 'continue' after a certain point
2013-03-11 00:39:05 -04:00
1ecf4a6943
Working on complex argument support.
2013-02-17 15:01:49 -05:00
c8878998d1
update some of many copyright dates but we can just do this when editing each file, not super high priority
2013-02-16 15:32:01 -05:00
f7497e75e5
Able to use "environment: " on any task to pass proxy details and other useful settings. Can be a variable
...
or a dictionary.
2013-02-10 13:05:58 -05:00
a9162a86f2
Very basic --diff option for showing what happens when templates change.
...
Probably output is not useful if not used with --limit
Works well with --check mode
2013-02-07 22:52:25 -05:00
fed82c2188
This implements a basic --check mode which for now is only implemented on template & copy operations. More detail will be shared with the list
...
shortly.
2013-02-03 20:34:13 -05:00
a79373f6b2
Make template_ds the only templater
...
Instead of having to remember when to use which one, rename template_ds
to template and move the last bit of code from template to varReplace
(which gets used for all string replacements, in the end).
This means that you can template any data type without worrying about
whether it's a string or not, and the right thing will happen.
2013-02-03 14:01:54 +01:00
83b9654c63
stop updating SETUP_CACHE in run_play as per comment on pr 1945
2013-01-31 11:24:22 -05:00
f649777072
- make extra-vars override all other vars and facts in playbooks
2013-01-30 11:56:04 -05:00
3a36c024da
Make lookups being fatal up to the caller
...
Fixes #1769 .
2012-12-19 19:19:04 +01:00
97cc384ccf
Set basedir to . if there isn't one
...
This avoids special-casing '' = '.' everywhere the basedir gets used.
Fixes #1729 .
2012-12-19 13:22:57 +01:00
c2792a936d
Allow parameterized playbook includes to define complex variables
...
To be used like:
- include: playbook.yml
vars:
mylistvar:
- item1
- item2
2012-12-15 21:56:28 +01:00
b8d6dec5ad
Reset notified_by list per serialized batch
...
Fixes the case where a handler attempts to run for every batch after any
batch has notified it, regardless of whether the current batch did.
2012-11-28 22:04:44 +01:00
a56e1f31fa
Properly restrict hosts after 9070875
2012-11-28 22:03:23 +01:00
9070875a6f
Move available hosts gathering to a common function
2012-11-28 01:03:18 +01:00
5065103017
Skip already failed hosts
...
Fixes #1699 .
2012-11-28 00:54:08 +01:00
c948c65bcd
Template the name of the task
...
Broken by 1e0295cFixes #1698 .
2012-11-28 00:36:10 +01:00
900790af41
Reuse inventory object created by ansible-playbook in playbook
...
This reduces the amount of times an inventory script has to be invoked.
2012-11-27 15:24:33 +01:00
1e0295c7e2
Template handlers late
...
This allows overriding variables in name, and removes templating from
parsing.
2012-11-26 22:07:57 +01:00
e44b85daba
Remove special-casing for all group
...
global_vars has higher precedence than inventory. Putting the all
group's variables into it overrides all other groups and hosts.
Partially fixes #1647 .
2012-11-23 00:54:02 +01:00
ef357ed1f2
Use the play's vars for the setup step
...
Allows using -e ansible_ssh_port=foo and have it apply to all actions.
2012-11-21 23:42:24 +01:00
f95fefd8c5
Use plugin system to find modules
2012-11-18 19:09:21 +01:00
d500398e76
Merge pull request #1616 from dagwieers/skip-register
...
Do not register variable if host has been skipped
2012-11-14 06:33:30 -08:00
302eeae65d
Do not register variable if host has been skipped
...
Executive summary: skipping a host corrupts a variable (when it is registered)
We have a play existing out of multiple tasks that check a condition, if one of these tasks fails we want to skip all next tasks in the playbook. I noticed that if we skip a task because a certain condition is met, and this task has a register-attribute, I loose the value in the variable. Which means we cannot use that variable in subsequent tasks to evaluate because it was skipped:
```
- action: command test -d /some/directory
register: task
- action: command test -f /some/directory/file
register: task
only_if: '${task.rc} == 0'
- action: do something else
only_if: '${task.rc} == 0'
```
In the above example, if the second task is skipped (because the first failed), the third action will end with a "SyntaxError: invalid syntax" complaining about the unsubstituted ${task.rc} (even though it was set by the first task and used for skipping the second).
The following play demonstrates the problem:
```
- name: Test register on ignored tasks
hosts: all
gather_facts: no
vars:
skip: true
task: { 'rc': 666 }
tasks:
- action: debug msg='skip = ${skip}, task.rc = ${task.rc}'
- name: Skip this task, just to test if task has changed
action: command ls
register: task
only_if: '${skip} != True'
- action: debug msg='skip = ${skip}, task.rc = ${task.rc}'
- name: Now use task value
action: command echo 'Works !'
only_if: '${task.rc} == 0'
```
And the enclosed fix, fixes the above problem.
2012-11-13 16:57:10 +01:00
eebbbd3f0e
Make parameterized playbook includes work with vars as a list
...
Fixes #1610 .
2012-11-13 12:12:18 +01:00
9c095b72b9
Add parameterized playbook includes
...
Also makes with_* work with them.
Fixes #1162 .
2012-11-09 15:43:49 +01:00
e05e514861
Create a plugin loader system
2012-11-02 01:24:14 +01:00
d5db8e937e
Fix port overrides such that with fireball mode you don't have to specify an explicit port.
2012-10-17 22:50:17 -04:00
ab44a4abba
Load additional plugins from path specified in configuration
2012-10-14 21:09:24 +02:00
1aaf86069a
Look for plugins in the playbook's basedir
2012-10-14 21:09:23 +02:00
c5d2f6b0d3
implement lookup plugins for arbitrary enumeration over arbitrary things. See the mailing list for some cool examples.
2012-10-12 20:07:05 -04:00
271db7bddb
Merge pull request #1308 from abondis/named_action
...
named actions + modules list in utils.py
2012-10-12 14:33:43 -07:00
6d183959ba
#1303 : add sudo option to tasks
2012-10-12 12:39:45 -04:00
2063e10c00
named actions + modules list in utils.py
2012-10-12 11:28:10 -04:00
212296e59c
Merge pull request #1207 from dagwieers/gather_facts-fix
...
Fix gather_facts assumption that SETUP_CACHE for a host is empty
2012-10-02 19:05:54 -07:00
cef73d1545
Merge pull request #1202 from dagwieers/abort-play-abort-playbook
...
Abort a play at the start when no hosts matches, or no hosts are remaining
2012-10-02 19:02:27 -07:00
fedfd18774
Fix gather_facts assumption that SETUP_CACHE for a host is empty
...
We now check explicitely for 'module_setup' in the SETUP_CACHE in order to avoid skipping setup because SETUP_CACHE was populated some other way. Other modules can implement the same mechanism to test if they've already run.
This closes #1206 .
2012-10-02 23:17:45 +02:00
20c1a67711
Abort a play at the start when no hosts matches, or no hosts are remaining
...
This change makes a distinction between no_hosts_matched and no_hosts_remaining.
In both cases we do not start facts-gathering, or run any tasks.
In the case that there are no more hosts remaining, we abort running tasks and abort the playbook.
I also cleaned up the leftovers from the previous patchsets, as these are no longer required.
This closes #1187 .
Example playbook:
```yaml
---
- hosts: emptygroup
tasks:
- action: command date
- action: command false
- hosts: all
gather_facts: False
tasks:
- action: command ls
- action: command false
- action: command true
- hosts: all
tasks:
- action: command true
- action: command false
- hosts: all
tasks:
- action: command pwd
```
2012-10-02 15:54:24 +02:00
564a212b3c
Only gather facts once per node per playbook run
...
Unless gather_facts: True is on the play
2012-10-02 15:30:19 +02:00
5683277e4a
Be smarter about when to abort a playbook -- if it's early, we just didn't match any hosts, so keep on, hosts might be dynamic.
2012-10-01 22:07:08 -04:00
a2f76c1c69
If all hosts in a play fail, fail the whole playbook and don't bother printing out every remaining task.
2012-09-30 21:06:00 -04:00
19b78cedc8
Abort a play when there are no more hosts in it.
2012-09-30 20:48:35 -04:00
c84e76e31d
Make sure we retain facts between playbooks
...
This is mandatory if we want to make facts-modules (like network_facts, ilo_facts and esx_facts) work.
2012-09-28 17:44:51 +02:00
cc948f339c
Allow including files through variables
...
$FILE{file} will be replaced with the contents of "file"
$PIPE{cat file} will be replaced with the output of "cat file"
2012-09-19 17:57:17 +02:00
b8c4bb9e6e
Revert "Allow including files through variables"
...
This reverts commit bf47bb4753
2012-09-19 10:31:23 -04:00
b25b9fd840
Merge pull request #1058 from jkleint/devel
...
Support iteration over command output in with_items.
2012-09-18 17:55:40 -07:00
544a8e44d7
Merge pull request #1053 from dhozac/varreplace-include
...
Allow including files through variables
2012-09-18 17:53:02 -07:00
2a002f5c0b
Support iteration over command output in with_items.
...
When the output of a command is stored in a register, this will create a
stdout_lines field in the result object that contains stdout split into a list
of lines. This list can then be iterated over using with_items.
2012-09-17 16:57:33 -04:00
5bb0f6908b
Allow transport on tasks, and use it for local_action
2012-09-17 18:28:37 +02:00
bf47bb4753
Allow including files through variables
...
$FILE{file} will be replaced with the contents of "file"
$PIPE{cat file} will be replaced with the output of "cat file"
2012-09-17 16:03:59 +02:00
b9e100a506
Support import of playbooks in other directories
...
Previously, importing a playbook in a different directory didn't
work because all of the relative paths were resolved relative to
the top-level playbook.
This patch resolves relative paths on a per-play level instead of
relative to the directory of the top-level playbook.
Also removes the dirname argument from the Play._get_vars method
since this argument wasn't used in the metho dbody.
2012-09-09 22:59:56 -04:00
7a201dbb2e
Keep result pristine for ignore_errors
2012-09-04 22:40:07 +02:00
00c4c5c4a1
If tags "all" is used, don't choke.
2012-08-28 20:33:36 -04:00
4002cfbdcd
Minor string tweak.
2012-08-27 21:31:20 -04:00
2755602dcb
Check to make sure that tags passed as parameters actually exist
2012-08-27 21:27:07 -04:00
4b4bcdedc1
Fix off-by-one serial count (causing infinite loop for serial == 1).
2012-08-21 13:43:05 -07:00
898d7676f7
Adds the 'serial' keyword to a playbook which controls how many hosts can be running through a playbook at a single time.
...
The default is 0, which means all hosts. If set to 1, each host would run a playbook all the way through before moving
on the next host. Fact gathering is still parallel, regardless of the serial setting.
2012-08-18 09:52:13 -04:00
b42e835aab
Always load group_vars and host_vars.
2012-08-13 21:08:05 -07:00
1c81ddf8d4
add the limit option, which can be used to further confine the patterns selected by "hosts:" in ansible-playbooks
...
to an additional pattern (a subset) specified on the command line. For instance, a playbook could be reusable
and target "webservers" and "dbservers", but you want to test only in the stage environment, or a few boxes at a time.
2012-08-10 02:45:29 -04:00
05a128c2be
Add ability to store and access module results later on in the play. See examples/playbooks/register_logic for details.
2012-08-10 01:13:37 -04:00
6c5761a79e
Store the ${last_result} for each host to make it usable in only_if conditionals and such.
2012-08-10 00:58:53 -04:00
846186e2fc
Add -vvv support for debugging activity
2012-08-08 21:09:14 -04:00
faed4b5a33
whitespace + remove deprecated YAML parser (migration script lives in examples/scripts and warning was added
...
in 0.6 release)
2012-08-06 20:07:02 -04:00
19fc8eea80
Things that happen inside multiprocessing shouldn't make side effects, ergo append ansible_facts only
...
in playbook code.
This technically means with_items calls can't continuously add facts I guess, but I can't see anyone
ever trying that.
2012-07-25 21:30:49 -04:00
da4562f495
changes to not clear the setup cache between runs, and also decide to run plays with no tasks
...
in them if it looks like they are not tagged, because if that is the case, then we may just
be gathering facts about them.
2012-07-25 20:45:51 -04:00
f1b1611956
Fix typo while handling custom facts.
...
This fixes #611 .
2012-07-18 11:50:34 +02:00
5f69c557b9
Fix for the way host variables were being swallowed, plus some overall simplification. Deciding what
...
dictionary to use for templating now happens in exactly one place (executor_internal) and the "inject"
dictionary is passed to what needs it.
2012-07-15 14:19:11 -04:00
1754de3335
Misc code cleanup, mostly whitespace preferences, removing unused imports, plus a few fixes here and there.
2012-07-15 12:29:53 -04:00
6341e75e33
misc code cleanup
2012-07-15 11:20:59 -04:00
1d8bb17785
misc code cleanup
2012-07-15 10:57:22 -04:00
68a9adc1be
Indentation cleanup (partial)
2012-07-15 09:32:47 -04:00
60d64251f8
Allow gather_facts: False in a playbook as a way of disabling the fact step if you know
...
you aren't going to need it.
2012-07-14 19:49:42 -04:00
279b5965b8
Much streamlining around setup steps in playbooks, now only run setup once per play.
2012-07-14 12:24:19 -04:00
a765deccce
Allow top level playbook files to import other playbook files, added some basic
...
playbook structure checking.
2012-07-12 00:19:44 -04:00
969c3feb13
Allow include statements from plays to specify tags (see tags.yml example file).
...
Also be smart and don't run a play at all if no tasks in the play match any of the tags specified. This includes not running the setup actions!
2012-07-11 20:33:46 -04:00
83f23ef861
Basic support for tagging tasks and selecting a subset of tasks to run with --tags.
2012-07-11 19:51:26 -04:00
efac68b636
Remove the -D module debug flag, which no longer is functional due to sudo pty requirements, and replace with -v/--verbose.
...
This flag will show playbook output from non-failing commands. -v is also added to /usr/bin/ansible, but not yet used.
I also gutted some internals code dealing with 'invocations' which allowed the callback to know what module invoked
it. This is not something 0.5 does or needed, so callbacks have been simplified.
2012-06-19 21:57:43 -04:00
879ddddf6f
Add ./library to module search path.
...
It allows for custom modules in the best practices directory structure.
Bundling custom modules along with playbooks in packages is useful.
2012-06-25 21:08:43 +02:00
ad7b744764
Allow variables in notify list
2012-06-08 01:35:23 +02:00
1ee7ff2f7b
To allow plays using different user accounts in the same playbook to function, clear the setup cache
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between plays.
2012-05-31 22:08:00 -04:00
c34921fe7b
Removed legacy comment.
2012-05-30 15:37:14 -04:00
32b9ea689a
Test for play.vars_files == None, avoiding nasty traceback. Ignores for now. Could warn.
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Playbook test for no vars_files with len(), but that excepts if play.vars_files==None, as can happen when there's a vars_files section with no vars files listed. What is the ansible way: ignore, warn, or fail with message (instead of traceback)?
2012-05-29 10:09:38 -04:00
b9b53d1941
Playbook refactoring -- work in progress.
2012-05-26 00:37:34 -04:00
cf9ddf3a30
Reorganizing file structure. Not done.
2012-05-25 19:34:13 -04:00
James Cammarata
Kavin Kankeshwar
kavink
Jocelyn Jaubert
Kavin Kankeshwar
Petr Svoboda
René Moser
Serge van Ginderachter
Chris Church
Michael DeHaan
Stoned Elipot
Michael DeHaan
Tin Tvrtkovic
Alan Descoins
Tim Habermaas
Junegunn Choi
Seth Vidal
Daniel Hokka Zakrisson
Dag Wieers
Aurélien Bondis
John Kleint
Lorin Hochstein
Mark Theunissen
Dave Peticolas
Dave Peticolas
Jeroen Hoekx
Brad Olson