2 Generic fabric deployment script.
3 Create a fabfile.py in the project and start it with:
5 from fnpdjango.deploy import *
7 Then set up some env properties:
8 project_name: slug-like project name
9 hosts: list of target host names
10 user: remote user name
11 app_path: where does the app go
12 services: list of tasks to run after deployment
13 django_root_path (optional): path to the directory
14 containing django project, relative to the
15 root of the repository (defaults to '.')
16 localsettings_dst_path (optional): path indicating
17 where to copy the localsettings file, relative
18 to django_root_path (defaults to project_name/localsettings.py)
19 skip_collect_static (optional): if True, Django collectstatic command is not called
21 from os.path import abspath, dirname, exists, join
22 from django.utils.crypto import get_random_string
23 from fabric.api import *
24 from fabric.contrib import files
25 from fabric.tasks import Task, execute
27 env.virtualenv = '/usr/bin/virtualenv'
34 Setup all needed directories.
36 require('hosts', 'app_path')
38 if not files.exists(env.app_path):
39 run('mkdir -p %(app_path)s' % env, pty=True)
40 with cd(env.app_path):
41 for subdir in 'releases', 'packages', 'log', 'samples':
42 if not files.exists(subdir):
43 run('mkdir -p %s' % subdir, pty=True)
44 with cd('%(app_path)s/releases' % env):
45 if not files.exists('current'):
46 run('ln -sfT . current', pty=True)
47 if not files.exists('previous'):
48 run('ln -sfT . previous', pty=True)
53 def check_localsettings():
54 return files.exists('%(app_path)s/localsettings.py' % env)
60 Deploy the latest version of the site to the servers,
61 install any required third party modules,
62 install the virtual host and then restart the webserver
64 require('hosts', 'app_path')
67 env.release = time.strftime('%Y-%m-%dT%H%M')
70 if not check_localsettings():
71 abort('Setup is complete, but\n %(app_path)s/localsettings.py\n'
72 'is needed for actual deployment.' % env)
75 install_requirements()
76 symlink_current_release()
85 Limited rollback capability. Simple loads the previously current
86 version of the code. Rolling back again will swap between the two.
87 Warning: this will almost certainly go wrong, it there were any migrations
90 require('hosts', 'app_path')
92 run('mv releases/current releases/_previous;', pty=True)
93 run('mv releases/previous releases/current;', pty=True)
94 run('mv releases/_previous releases/previous;', pty=True)
99 def deploy_version(version):
101 Loads the specified version.
102 Warning: this will almost certainly go wrong, it there were any migrations
105 "Specify a specific version to be made live"
106 require('hosts', 'app_path')
107 env.version = version
109 run('rm releases/previous; mv releases/current releases/previous;', pty=True)
110 run('ln -s %(version)s releases/current' % env, pty=True)
117 for service in env.services:
121 # =====================================================================
122 # = Helpers. These are called by other functions rather than directly =
123 # =====================================================================
126 def upload_sample(self):
129 class DebianGunicorn(Service):
130 def __init__(self, name):
131 super(Task, self).__init__()
135 print '>>> restart webserver using gunicorn-debian'
136 sudo('gunicorn-debian restart %s' % self.name, shell=False)
138 def upload_sample(self):
139 upload_sample('gunicorn')
141 class Apache(Service):
143 print '>>> restart webserver by touching WSGI'
145 run('touch %(app_path)s/%(project_name)s/wsgi.py' % env)
147 class Supervisord(Service):
148 def __init__(self, name):
149 super(Task, self).__init__()
153 print '>>> supervisord: restart %s' % self.name
154 sudo('supervisorctl restart %s' % self.name, shell=False)
157 def __init__(self, commands, working_dir):
158 if not hasattr(commands, '__iter__'):
159 commands = [commands]
160 self.name = 'Command: %s @ %s' % (commands, working_dir)
161 self.commands = commands
162 self.working_dir = working_dir
166 with cd(join('%(app_path)s/releases/current' % env, self.working_dir)):
167 for command in self.commands:
170 def upload_samples():
171 upload_localsettings_sample()
172 upload_nginx_sample()
173 for service in env.services:
174 service.upload_sample()
176 def upload_sample(name, where="samples/"):
177 require('app_path', 'project_name')
178 upload_path = '%s/%s%s.sample' % (env['app_path'], where, name)
179 if files.exists(upload_path):
181 print '>>> upload %s template' % name
182 template = '%(project_name)s/' % env + name + '.template'
183 if not exists(template):
184 template = join(dirname(abspath(__file__)), 'templates/' + name + '.template')
185 files.upload_template(template, upload_path, env)
187 def upload_localsettings_sample():
188 "Fill out localsettings template and upload as a sample."
189 env.secret_key = get_random_string(50)
190 upload_sample('localsettings.py', where="")
192 upload_nginx_sample = lambda: upload_sample('nginx')
194 def upload_tar_from_git():
195 "Create an archive from the current Git branch and upload it"
196 print '>>> upload tar from git'
197 require('release', provided_by=[deploy])
199 local('git-archive-all.sh --format tar %(release)s.tar' % env)
200 local('gzip %(release)s.tar' % env)
201 run('mkdir -p %(app_path)s/releases/%(release)s' % env, pty=True)
202 run('mkdir -p %(app_path)s/packages' % env, pty=True)
203 put('%(release)s.tar.gz' % env, '%(app_path)s/packages/' % env)
204 run('cd %(app_path)s/releases/%(release)s && tar zxf ../../packages/%(release)s.tar.gz' % env, pty=True)
205 local('rm %(release)s.tar.gz' % env)
207 def install_requirements():
208 "Install the required packages from the requirements file using pip"
209 print '>>> install requirements'
210 require('release', provided_by=[deploy])
212 if not files.exists('%(app_path)s/ve' % env):
213 require('virtualenv')
214 run('%(virtualenv)s %(app_path)s/ve' % env, pty=True)
215 with cd('%(app_path)s/releases/%(release)s' % env):
216 run('%(app_path)s/ve/bin/pip install -r requirements.txt' % env, pty=True)
217 with cd(get_django_root_path(env['release'])):
218 # Install DB requirement
220 'django.db.backends.postgresql_psycopg2': 'psycopg2',
221 'django.db.backends.mysql': 'MySQL-python',
223 databases = run('''DJANGO_SETTINGS_MODULE=%(project_name)s.settings %(app_path)s/ve/bin/python -c 'from django.conf import settings; print " ".join(set([d["ENGINE"] for d in settings.DATABASES.values()]))' ''' % env)
224 for database in databases.split():
225 if database in database_reqs:
226 # TODO: set pip default pypi
227 run('%(app_path)s/ve/bin/pip install ' % env + database_reqs[database])
230 def copy_localsettings():
231 "Copy localsettings.py from root directory to release directory (if this file exists)"
232 print ">>> copy localsettings"
233 require('release', provided_by=[deploy])
234 require('app_path', 'project_name')
236 with settings(warn_only=True):
237 copy_to = join(get_django_root_path(env['release']), env.get('localsettings_dst_path', env['project_name']))
238 run('cp %(app_path)s/localsettings.py ' % env + copy_to)
240 def symlink_current_release():
241 "Symlink our current release"
242 print '>>> symlink current release'
243 require('release', provided_by=[deploy])
245 with cd(env.app_path):
246 run('rm releases/previous; mv releases/current releases/previous')
247 run('ln -s %(release)s releases/current' % env)
250 "Update the database"
252 require('app_path', 'project_name')
253 with cd(get_django_root_path('current')):
254 run('%(app_path)s/ve/bin/python manage.py syncdb --noinput' % env, pty=True)
255 run('%(app_path)s/ve/bin/python manage.py migrate' % env, pty=True)
257 def pre_collectstatic():
258 print '>>> pre_collectstatic'
259 for task in env.get('pre_collectstatic', []):
263 """Collect static files"""
264 print '>>> collectstatic'
265 if env.get('skip_collect_static', False):
268 require('app_path', 'project_name')
269 with cd(get_django_root_path('current')):
270 run('%(app_path)s/ve/bin/python manage.py collectstatic --noinput' % env, pty=True)
273 def get_django_root_path(release):
275 path = '%(app_path)s/releases/%(release)s' % dict(app_path = env['app_path'], release = release)
276 if 'django_root_path' in env:
277 path = join(path, env['django_root_path'])