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community.general/library/get_url
igor 005f864068 minor doc changes
2013-01-26 12:20:45 -05:00

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2012, Jan-Piet Mens <jpmens () gmail.com>
#
# This file is part of Ansible
#
# Ansible 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.
#
# Ansible 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 Ansible. If not, see <http://www.gnu.org/licenses/>.
#
# see examples/playbooks/get_url.yml
import shutil
import datetime
import tempfile
DOCUMENTATION = '''
---
module: get_url
short_description: Downloads files from HTTP, HTTPS, or FTP to node
description:
- Downloads files from HTTP, HTTPS, or FTP to the remote server. The remote
server I(must) have direct access to the remote resource.
version_added: "0.6"
options:
url:
description:
- HTTP, HTTPS, or FTP URL.
(http|https|ftp)://[user[:pass]]@host.domain[:port]/path
required: true
default: null
aliases: []
dest:
description:
- absolute path of where to download the file to.
- If I(dest) is a directory, the basename of the file on the remote server will be used. If a directory, C(thirsty=yes) must also be set.
required: true
default: null
thirsty:
description:
- if C(yes), will download the file every time and replace the
file if the contents change. If C(no), the file will only be downloaded if
the destination does not exist. Generally should be C(yes) only for small
local files. prior to 0.6, acts if C(yes) by default.
version_added: "0.7"
required: false
choices: [ "yes", "no" ]
default: "no"
others:
description:
- all arguments accepted by the M(file) module also work here
required: false
examples:
- code: "get_url: url=http://example.com/path/file.conf dest=/etc/foo.conf mode=0440"
description: "Example from Ansible Playbooks"
notes:
- This module doesn't yet support configuration for proxies.
# informational: requirements for nodes
requirements: [ urllib2, urlparse ]
author: Jan-Piet Mens
'''
HAS_URLLIB2 = True
try:
import urllib2
except ImportError:
HAS_URLLIB2 = False
HAS_URLPARSE = True
try:
import urlparse
import socket
except ImportError:
HAS_URLPARSE=False
# ==============================================================
# url handling
def url_filename(url):
fn = os.path.basename(urlparse.urlsplit(url)[2])
if fn == '':
return 'index.html'
return fn
def url_do_get(module, url, dest):
"""
Get url and return request and info
Credits: http://stackoverflow.com/questions/7006574/how-to-download-file-from-ftp
"""
USERAGENT = 'ansible-httpget'
info = dict(url=url, dest=dest)
r = None
parsed = urlparse.urlparse(url)
if '@' in parsed.netloc:
credentials = parsed.netloc.split('@')[0]
if ':' in credentials:
username, password = credentials.split(':')
netloc = parsed.netloc.split('@')[1]
parsed = list(parsed)
parsed[1] = netloc
passman = urllib2.HTTPPasswordMgrWithDefaultRealm()
# this creates a password manager
passman.add_password(None, netloc, username, password)
# because we have put None at the start it will always
# use this username/password combination for urls
# for which `theurl` is a super-url
authhandler = urllib2.HTTPBasicAuthHandler(passman)
# create the AuthHandler
opener = urllib2.build_opener(authhandler)
urllib2.install_opener(opener)
#reconstruct url without credentials
url = urlparse.urlunparse(parsed)
request = urllib2.Request(url)
request.add_header('User-agent', USERAGENT)
if os.path.exists(dest):
t = datetime.datetime.utcfromtimestamp(os.path.getmtime(dest))
tstamp = t.strftime('%a, %d %b %Y %H:%M:%S +0000')
request.add_header('If-Modified-Since', tstamp)
try:
r = urllib2.urlopen(request)
info.update(r.info())
info.update(dict(msg="OK (%s bytes)" % r.headers.get('Content-Length', 'unknown'), status=200))
except urllib2.HTTPError, e:
# Must not fail_json() here so caller can handle HTTP 304 unmodified
info.update(dict(msg=str(e), status=e.code))
return r, info
except urllib2.URLError, e:
code = getattr(e, 'code', -1)
module.fail_json(msg="Request failed: %s" % str(e), status_code=code)
return r, info
def url_get(module, url, dest):
"""
Download url and store at dest.
If dest is a directory, determine filename from url.
Return (tempfile, info about the request)
"""
req, info = url_do_get(module, url, dest)
# TODO: should really handle 304, but how? src file could exist (and be newer) but empty
if info['status'] == 304:
module.exit_json(url=url, dest=dest, changed=False, msg=info.get('msg', ''))
# create a temporary file and copy content to do md5-based replacement
if info['status'] != 200:
module.fail_json(msg="Request failed", status_code=info['status'], response=info['msg'], url=url, dest=dest)
fd, tempname = tempfile.mkstemp()
f = os.fdopen(fd, 'wb')
try:
shutil.copyfileobj(req, f)
except Exception, err:
os.remove(tempname)
module.fail_json(msg="failed to create temporary content file: %s" % str(err))
f.close()
req.close()
return tempname, info
# ==============================================================
# main
def main():
# does this really happen on non-ancient python?
if not HAS_URLLIB2:
module.fail_json(msg="urllib2 is not installed")
if not HAS_URLPARSE:
module.fail_json(msg="urlparse is not installed")
module = AnsibleModule(
# not checking because of daisy chain to file module
argument_spec = dict(
url = dict(required=True),
dest = dict(required=True),
thirsty = dict(default='no', choices=BOOLEANS)
),
add_file_common_args=True
)
url = module.params['url']
dest = os.path.expanduser(module.params['dest'])
thirsty = module.boolean(module.params['thirsty'])
if os.path.isdir(dest):
dest = os.path.join(dest, url_filename(url))
if not thirsty:
if os.path.exists(dest):
module.exit_json(msg="file already exists", dest=dest, url=url, changed=False)
# download to tmpsrc
tmpsrc, info = url_get(module, url, dest)
md5sum_src = None
md5sum_dest = None
# raise an error if there is no tmpsrc file
if not os.path.exists(tmpsrc):
os.remove(tmpsrc)
module.fail_json(msg="Request failed", status_code=info['status'], response=info['msg'])
if not os.access(tmpsrc, os.R_OK):
os.remove(tmpsrc)
module.fail_json( msg="Source %s not readable" % (tmpsrc))
md5sum_src = module.md5(tmpsrc)
# check if there is no dest file
if os.path.exists(dest):
# raise an error if copy has no permission on dest
if not os.access(dest, os.W_OK):
os.remove(tmpsrc)
module.fail_json( msg="Destination %s not writable" % (dest))
if not os.access(dest, os.R_OK):
os.remove(tmpsrc)
module.fail_json( msg="Destination %s not readable" % (dest))
md5sum_dest = module.md5(dest)
else:
if not os.access(os.path.dirname(dest), os.W_OK):
os.remove(tmpsrc)
module.fail_json( msg="Destination %s not writable" % (os.path.dirname(dest)))
if md5sum_src != md5sum_dest:
try:
shutil.copyfile(tmpsrc, dest)
except Exception, err:
os.remove(tmpsrc)
module.fail_json(msg="failed to copy %s to %s: %s" % (tmpsrc, dest, str(err)))
changed = True
else:
changed = False
os.remove(tmpsrc)
# allow file attribute changes
module.params['path'] = dest
file_args = module.load_file_common_arguments(module.params)
file_args['path'] = dest
changed = module.set_file_attributes_if_different(file_args, changed)
# Mission complete
module.exit_json(url=url, dest=dest, src=tmpsrc, md5sum=md5sum_src,
changed=changed, msg=info.get('msg', ''),
daisychain="file", daisychain_args=info.get('daisychain_args', ''))
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()
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