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Added a host expansion feature to ansible's inventory parsing

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pull/680/head
Chin Fang 12 years ago
parent 2d1c297fb8
commit e3b2521f01
7 changed files with 87 additions and 16 deletions
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5
CHANGELOG.md
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@ -3,6 +3,11 @@ Ansible Changes By Release
0.6 "Cabo" ------------ pending
* inventory file can use a line of the form base[beg:end]tail to define a
set of hosts, where [beg:end] defines a numerical range. 'beg' can be a
a string padded with zero(s) to the left. If so provided, it acts as
a formatting hint during hostname expansion. The hint must be confirmed
by having an 'end' that has the same length as 'beg'
* groups variable available as a hash to return the hosts in each group name
* fetch module now does not fail a system when requesting file paths (ex: logs) that don't exist
* apt module now takes an optional install-recommends=yes|no (default yes)

2
Makefile
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@ -6,7 +6,7 @@
# useful targets:
# make sdist ---------------- produce a tarball
# make rpm ----------------- produce RPMs
# make debian --------------- produce a dpkg (FIXME?)
# make deb ------------------ produce a DEB
# make docs ----------------- rebuild the manpages (results are checked in)
# make tests ---------------- run the tests
# make pyflakes, make pep8 -- source code checks

14
docs/man/man1/ansible.1
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@ -140,7 +140,19 @@ Connection type to use\&. Possible options are
.RE
.SH "INVENTORY"
.sp
Ansible stores the hosts it can potentially operate on in an inventory file\&. The syntax is one host per line\&. Groups headers are allowed and are included on their own line, enclosed in square brackets\&.
Ansible stores the hosts it can potentially operate on in an inventory
file\&. The syntax is one host per line\&. Optionally, ansible can use a
line of the form base[beg:end]tail to define a set of hosts, where
[beg:end] defines a numerical range. If 'beg' is left out, it
defaults to 0\&. An example: mail[1:6].example.com, where 'head'
is 'mail', 'beg' is 1, 'end' is 6, and 'tail' is '.example.com'\&. In
addition, 'beg' can be a a string padded with zero(s) to the left. If so
provided, it acts as a formatting hint during hostname expansion. The usage
must be confirmed by having an 'end' that has the same length as 'beg',
else an exception is raised. An example: mail[001:003].example.com is to be
expanded to mail001.example.com, mail002.example.com, and
mail003.example.com\&. Groups headers are allowed and are included on their
own line, enclosed in square brackets\&.
.SH "FILES"
.sp
/etc/ansible/hosts \(em Default inventory file

8
examples/hosts
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@ -16,6 +16,8 @@ bikeshed.org
bastion.secure.bikeshed.org
192.168.100.1
192.168.100.10
# An example for host expansion that uses the default 'beg' and an 'end'
mail[:5].example.com
# Ex 2: A collection of hosts belonging to the 'webservers' group
[webservers]
@ -26,6 +28,9 @@ wheel.colors.com
192.168.1.110
# Your personal website also runs a webserver:
myserver.com
# An example for host expansion that uses both a 'beg' and an 'end', with
# the 'beg' acting as a formatting hint during host name expansion
www[001:006].example.com
# Ex 3: A collection of database servers in the 'dbservers' group
[dbservers]
@ -35,3 +40,6 @@ db02.intranet.mydomain.net
10.25.1.57
# Perhaps you serve a db off your personal server too:
myserver.com
# An example for host expansion that uses a regular 'beg' and a regular
# 'end'
db-[99:101]-node.example.com

35
lib/ansible/inventory/ini.py
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@ -24,6 +24,8 @@ import subprocess
import ansible.constants as C
from ansible.inventory.host import Host
from ansible.inventory.group import Group
from ansible.inventory.expand_hosts import detect_range
from ansible.inventory.expand_hosts import expand_hostname_range
from ansible import errors
from ansible import utils
@ -80,21 +82,40 @@ class InventoryParser(object):
continue
hostname = tokens[0]
port = C.DEFAULT_REMOTE_PORT
if hostname.find(":") != -1:
tokens2 = hostname.split(":")
hostname = tokens2[0]
port = tokens2[1]
# Two cases to check:
# 0. A hostname that contains a range pesudo-code and a port
# 1. A hostname that contains just a port
if (hostname.find("[") != -1 and
hostname.find("]") != -1 and
hostname.find(":") != -1 and
(hostname.rindex("]") < hostname.rindex(":")) or
(hostname.find("]") == -1 and hostname.find(":") != -1)):
tokens2 = hostname.rsplit(":", 1)
hostname = tokens2[0]
port = tokens2[1]
host = None
_all_hosts = []
if hostname in self.hosts:
host = self.hosts[hostname]
_all_hosts.append(host)
else:
host = Host(name=hostname, port=port)
self.hosts[hostname] = host
if detect_range(hostname):
_hosts = expand_hostname_range(hostname)
for _ in _hosts:
host = Host(name=_, port=port)
self.hosts[_] = host
_all_hosts.append(host)
else:
host = Host(name=hostname, port=port)
self.hosts[hostname] = host
_all_hosts.append(host)
if len(tokens) > 1:
for t in tokens[1:]:
(k,v) = t.split("=")
host.set_variable(k,v)
self.groups[active_group_name].add_host(host)
for _ in _all_hosts:
self.groups[active_group_name].add_host(_)
# [southeast:children]
# atlanta

36
test/TestInventory.py
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@ -44,14 +44,24 @@ class TestInventory(unittest.TestCase):
inventory = self.simple_inventory()
hosts = inventory.list_hosts()
expected_hosts=['jupiter', 'saturn', 'zeus', 'hera', 'poseidon', 'thor', 'odin', 'loki']
expected_hosts=['jupiter', 'saturn', 'zeus', 'hera',
'cerberus001','cerberus002','cerberus003',
'cottus99', 'cottus100',
'poseidon', 'thor', 'odin', 'loki',
'thrudgelmir0', 'thrudgelmir1', 'thrudgelmir2',
'thrudgelmir3', 'thrudgelmir4', 'thrudgelmir5']
assert sorted(hosts) == sorted(expected_hosts)
def test_simple_all(self):
inventory = self.simple_inventory()
hosts = inventory.list_hosts('all')
expected_hosts=['jupiter', 'saturn', 'zeus', 'hera', 'poseidon', 'thor', 'odin', 'loki']
expected_hosts=['jupiter', 'saturn', 'zeus', 'hera',
'cerberus001','cerberus002','cerberus003',
'cottus99', 'cottus100',
'poseidon', 'thor', 'odin', 'loki',
'thrudgelmir0', 'thrudgelmir1', 'thrudgelmir2',
'thrudgelmir3', 'thrudgelmir4', 'thrudgelmir5']
assert sorted(hosts) == sorted(expected_hosts)
def test_simple_norse(self):
@ -65,21 +75,29 @@ class TestInventory(unittest.TestCase):
inventory = self.simple_inventory()
hosts = inventory.list_hosts("ungrouped")
expected_hosts=['jupiter', 'saturn']
expected_hosts=['jupiter', 'saturn',
'thrudgelmir0', 'thrudgelmir1', 'thrudgelmir2',
'thrudgelmir3', 'thrudgelmir4', 'thrudgelmir5']
assert sorted(hosts) == sorted(expected_hosts)
def test_simple_combined(self):
inventory = self.simple_inventory()
hosts = inventory.list_hosts("norse:greek")
expected_hosts=['zeus', 'hera', 'poseidon', 'thor', 'odin', 'loki']
expected_hosts=['zeus', 'hera', 'poseidon',
'cerberus001','cerberus002','cerberus003',
'cottus99','cottus100',
'thor', 'odin', 'loki']
assert sorted(hosts) == sorted(expected_hosts)
def test_simple_restrict(self):
inventory = self.simple_inventory()
restricted_hosts = ['hera', 'poseidon', 'thor']
expected_hosts=['zeus', 'hera', 'poseidon', 'thor', 'odin', 'loki']
expected_hosts=['zeus', 'hera', 'poseidon',
'cerberus001','cerberus002','cerberus003',
'cottus99', 'cottus100',
'thor', 'odin', 'loki']
inventory.restrict_to(restricted_hosts)
hosts = inventory.list_hosts("norse:greek")
@ -99,11 +117,15 @@ class TestInventory(unittest.TestCase):
inventory = self.simple_inventory()
hosts = inventory.list_hosts("all:!greek")
expected_hosts=['jupiter', 'saturn', 'thor', 'odin', 'loki']
expected_hosts=['jupiter', 'saturn', 'thor', 'odin', 'loki',
'thrudgelmir0', 'thrudgelmir1', 'thrudgelmir2',
'thrudgelmir3', 'thrudgelmir4', 'thrudgelmir5']
assert sorted(hosts) == sorted(expected_hosts)
hosts = inventory.list_hosts("all:!norse:!greek")
expected_hosts=['jupiter', 'saturn']
expected_hosts=['jupiter', 'saturn',
'thrudgelmir0', 'thrudgelmir1', 'thrudgelmir2',
'thrudgelmir3', 'thrudgelmir4', 'thrudgelmir5']
assert sorted(hosts) == sorted(expected_hosts)
def test_simple_vars(self):

3
test/simple_hosts
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@ -1,10 +1,13 @@
jupiter
saturn
thrudgelmir[:6]
[greek]
zeus
hera:3000
poseidon
cerberus[001:004]
cottus[99:101]
[norse]
thor

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