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422 lines
17 KiB
Python
422 lines
17 KiB
Python
#!/usr/bin/python
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DOCUMENTATION = '''
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---
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module: deploy_helper
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version_added: "1.8"
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author: Ramon de la Fuente, Jasper N. Brouwer
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short_description: Manages some of the steps common in deploying projects.
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description:
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- The Deploy Helper manages some of the steps common in deploying software.
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It creates a folder structure, manages a symlink for the current release
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and cleans up old releases.
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- "Running it with the C(state=query) or C(state=present) will return the C(deploy_helper) fact.
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C(project_path), whatever you set in the path parameter,
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C(current_path), the path to the symlink that points to the active release,
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C(releases_path), the path to the folder to keep releases in,
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C(shared_path), the path to the folder to keep shared resources in,
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C(unfinished_filename), the file to check for to recognize unfinished builds,
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C(previous_release), the release the 'current' symlink is pointing to,
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C(previous_release_path), the full path to the 'current' symlink target,
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C(new_release), either the 'release' parameter or a generated timestamp,
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C(new_release_path), the path to the new release folder (not created by the module)."
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options:
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path:
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required: true
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aliases: ['dest']
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description:
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- the root path of the project. Alias I(dest).
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Returned in the C(deploy_helper.project_path) fact.
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state:
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required: false
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choices: [ present, finalize, absent, clean, query ]
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default: present
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description:
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- the state of the project.
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C(query) will only gather facts,
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C(present) will create the project I(root) folder, and in it the I(releases) and I(shared) folders,
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C(finalize) will remove the unfinished_filename file, create a symlink to the newly
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deployed release and optionally clean old releases,
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C(clean) will remove failed & old releases,
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C(absent) will remove the project folder (synonymous to the M(file) module with C(state=absent))
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release:
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required: false
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description:
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- the release version that is being deployed. Defaults to a timestamp format %Y%m%d%H%M%S (i.e. '20141119223359').
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This parameter is optional during C(state=present), but needs to be set explicitly for C(state=finalize).
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You can use the generated fact C(release={{ deploy_helper.new_release }}).
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releases_path:
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required: false
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default: releases
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description:
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- the name of the folder that will hold the releases. This can be relative to C(path) or absolute.
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Returned in the C(deploy_helper.releases_path) fact.
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shared_path:
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required: false
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default: shared
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description:
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- the name of the folder that will hold the shared resources. This can be relative to C(path) or absolute.
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If this is set to an empty string, no shared folder will be created.
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Returned in the C(deploy_helper.shared_path) fact.
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current_path:
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required: false
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default: current
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description:
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- the name of the symlink that is created when the deploy is finalized. Used in C(finalize) and C(clean).
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Returned in the C(deploy_helper.current_path) fact.
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unfinished_filename:
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required: false
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default: DEPLOY_UNFINISHED
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description:
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- the name of the file that indicates a deploy has not finished. All folders in the releases_path that
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contain this file will be deleted on C(state=finalize) with clean=True, or C(state=clean). This file is
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automatically deleted from the I(new_release_path) during C(state=finalize).
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clean:
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required: false
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default: True
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description:
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- Whether to run the clean procedure in case of C(state=finalize).
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keep_releases:
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required: false
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default: 5
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description:
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- the number of old releases to keep when cleaning. Used in C(finalize) and C(clean). Any unfinished builds
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will be deleted first, so only correct releases will count.
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notes:
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- Facts are only returned for C(state=query) and C(state=present). If you use both, you should pass any overridden
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parameters to both calls, otherwise the second call will overwrite the facts of the first one.
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- When using C(state=clean), the releases are ordered by I(creation date). You should be able to switch to a
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new naming strategy without problems.
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- Because of the default behaviour of generating the I(new_release) fact, this module will not be idempotent
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unless you pass your own release name with C(release). Due to the nature of deploying software, this should not
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be much of a problem.
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'''
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EXAMPLES = '''
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# General explanation, starting with an example folder structure for a project:
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root:
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releases:
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- 20140415234508
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- 20140415235146
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- 20140416082818
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shared:
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- sessions
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- uploads
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current: -> releases/20140416082818
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The 'releases' folder holds all the available releases. A release is a complete build of the application being
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deployed. This can be a clone of a repository for example, or a sync of a local folder on your filesystem.
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Having timestamped folders is one way of having distinct releases, but you could choose your own strategy like
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git tags or commit hashes.
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During a deploy, a new folder should be created in the releases folder and any build steps required should be
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performed. Once the new build is ready, the deploy procedure is 'finalized' by replacing the 'current' symlink
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with a link to this build.
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The 'shared' folder holds any resource that is shared between releases. Examples of this are web-server
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session files, or files uploaded by users of your application. It's quite common to have symlinks from a release
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folder pointing to a shared/subfolder, and creating these links would be automated as part of the build steps.
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The 'current' symlink points to one of the releases. Probably the latest one, unless a deploy is in progress.
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The web-server's root for the project will go through this symlink, so the 'downtime' when switching to a new
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release is reduced to the time it takes to switch the link.
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To distinguish between successful builds and unfinished ones, a file can be placed in the folder of the release
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that is currently in progress. The existence of this file will mark it as unfinished, and allow an automated
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procedure to remove it during cleanup.
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# Typical usage:
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- name: Initialize the deploy root and gather facts
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deploy_helper: path=/path/to/root
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- name: Clone the project to the new release folder
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git: repo=git://foosball.example.org/path/to/repo.git dest={{ deploy_helper.new_release_path }} version=v1.1.1
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- name: Add an unfinished file, to allow cleanup on successful finalize
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file: path={{ deploy_helper.new_release_path }}/{{ deploy_helper.unfinished_filename }} state=touch
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- name: Perform some build steps, like running your dependency manager for example
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composer: command=install working_dir={{ deploy_helper.new_release_path }}
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- name: Create some folders in the shared folder
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file: path='{{ deploy_helper.shared_path }}/{{ item }}' state=directory
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with_items: ['sessions', 'uploads']
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- name: Add symlinks from the new release to the shared folder
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file: path='{{ deploy_helper.new_release_path }}/{{ item.path }}'
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src='{{ deploy_helper.shared_path }}/{{ item.src }}'
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state=link
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with_items:
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- { path: "app/sessions", src: "sessions" }
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- { path: "web/uploads", src: "uploads" }
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- name: Finalize the deploy, removing the unfinished file and switching the symlink
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deploy_helper: path=/path/to/root release={{ deploy_helper.new_release }} state=finalize
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# Retrieving facts before running a deploy
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- name: Run 'state=query' to gather facts without changing anything
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deploy_helper: path=/path/to/root state=query
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# Remember to set the 'release' parameter when you actually call 'state=present' later
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- name: Initialize the deploy root
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deploy_helper: path=/path/to/root release={{ deploy_helper.new_release }} state=present
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# all paths can be absolute or relative (to the 'path' parameter)
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- deploy_helper: path=/path/to/root
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releases_path=/var/www/project/releases
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shared_path=/var/www/shared
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current_path=/var/www/active
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# Using your own naming strategy for releases (a version tag in this case):
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- deploy_helper: path=/path/to/root release=v1.1.1 state=present
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- deploy_helper: path=/path/to/root release={{ deploy_helper.new_release }} state=finalize
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# Using a different unfinished_filename:
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- deploy_helper: path=/path/to/root
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unfinished_filename=README.md
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release={{ deploy_helper.new_release }}
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state=finalize
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# Postponing the cleanup of older builds:
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- deploy_helper: path=/path/to/root release={{ deploy_helper.new_release }} state=finalize clean=False
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- deploy_helper: path=/path/to/root state=clean
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# Or running the cleanup ahead of the new deploy
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- deploy_helper: path=/path/to/root state=clean
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- deploy_helper: path=/path/to/root state=present
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# Keeping more old releases:
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- deploy_helper: path=/path/to/root release={{ deploy_helper.new_release }} state=finalize keep_releases=10
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# Or, if you use 'clean=false' on finalize:
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- deploy_helper: path=/path/to/root state=clean keep_releases=10
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# Removing the entire project root folder
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- deploy_helper: path=/path/to/root state=absent
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# Debugging the facts returned by the module
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- deploy_helper: path=/path/to/root
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- debug: var=deploy_helper
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'''
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class DeployHelper(object):
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def __init__(self, module):
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module.params['path'] = os.path.expanduser(module.params['path'])
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self.module = module
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self.file_args = module.load_file_common_arguments(module.params)
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self.clean = module.params['clean']
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self.current_path = module.params['current_path']
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self.keep_releases = module.params['keep_releases']
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self.path = module.params['path']
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self.release = module.params['release']
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self.releases_path = module.params['releases_path']
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self.shared_path = module.params['shared_path']
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self.state = module.params['state']
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self.unfinished_filename = module.params['unfinished_filename']
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def gather_facts(self):
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current_path = os.path.join(self.path, self.current_path)
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releases_path = os.path.join(self.path, self.releases_path)
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if self.shared_path:
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shared_path = os.path.join(self.path, self.shared_path)
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else:
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shared_path = None
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previous_release, previous_release_path = self._get_last_release(current_path)
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if not self.release and (self.state == 'query' or self.state == 'present'):
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self.release = time.strftime("%Y%m%d%H%M%S")
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new_release_path = os.path.join(releases_path, self.release)
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return {
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'project_path': self.path,
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'current_path': current_path,
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'releases_path': releases_path,
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'shared_path': shared_path,
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'previous_release': previous_release,
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'previous_release_path': previous_release_path,
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'new_release': self.release,
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'new_release_path': new_release_path,
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'unfinished_filename': self.unfinished_filename
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}
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def delete_path(self, path):
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if not os.path.lexists(path):
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return False
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if not os.path.isdir(path):
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self.module.fail_json(msg="%s exists but is not a directory" % path)
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if not self.module.check_mode:
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try:
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shutil.rmtree(path, ignore_errors=False)
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except Exception, e:
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self.module.fail_json(msg="rmtree failed: %s" % str(e))
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return True
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def create_path(self, path):
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changed = False
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if not os.path.lexists(path):
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changed = True
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if not self.module.check_mode:
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os.makedirs(path)
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elif not os.path.isdir(path):
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self.module.fail_json(msg="%s exists but is not a directory" % path)
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changed += self.module.set_directory_attributes_if_different(self._get_file_args(path), changed)
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return changed
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def check_link(self, path):
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if os.path.lexists(path):
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if not os.path.islink(path):
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self.module.fail_json(msg="%s exists but is not a symbolic link" % path)
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def create_link(self, source, link_name):
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if not self.module.check_mode:
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if os.path.islink(link_name):
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os.unlink(link_name)
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os.symlink(source, link_name)
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return True
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def remove_unfinished_file(self, new_release_path):
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changed = False
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unfinished_file_path = os.path.join(new_release_path, self.unfinished_filename)
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if os.path.lexists(unfinished_file_path):
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changed = True
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if not self.module.check_mode:
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os.remove(unfinished_file_path)
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return changed
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def remove_unfinished_builds(self, releases_path):
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changes = 0
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for release in os.listdir(releases_path):
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if (os.path.isfile(os.path.join(releases_path, release, self.unfinished_filename))):
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if self.module.check_mode:
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changes += 1
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else:
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changes += self.delete_path(os.path.join(releases_path, release))
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return changes
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def cleanup(self, releases_path):
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changes = 0
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if os.path.lexists(releases_path):
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releases = [ f for f in os.listdir(releases_path) if os.path.isdir(os.path.join(releases_path,f)) ]
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if not self.module.check_mode:
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releases.sort( key=lambda x: os.path.getctime(os.path.join(releases_path,x)), reverse=True)
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for release in releases[self.keep_releases:]:
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changes += self.delete_path(os.path.join(releases_path, release))
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elif len(releases) > self.keep_releases:
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changes += (len(releases) - self.keep_releases)
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return changes
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def _get_file_args(self, path):
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file_args = self.file_args.copy()
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file_args['path'] = path
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return file_args
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def _get_last_release(self, current_path):
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previous_release = None
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previous_release_path = None
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if os.path.lexists(current_path):
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previous_release_path = os.path.realpath(current_path)
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previous_release = os.path.basename(previous_release_path)
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return previous_release, previous_release_path
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def main():
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module = AnsibleModule(
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argument_spec = dict(
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path = dict(aliases=['dest'], required=True, type='str'),
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release = dict(required=False, type='str', default=''),
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releases_path = dict(required=False, type='str', default='releases'),
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shared_path = dict(required=False, type='str', default='shared'),
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current_path = dict(required=False, type='str', default='current'),
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keep_releases = dict(required=False, type='int', default=5),
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clean = dict(required=False, type='bool', default=True),
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unfinished_filename = dict(required=False, type='str', default='DEPLOY_UNFINISHED'),
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state = dict(required=False, choices=['present', 'absent', 'clean', 'finalize', 'query'], default='present')
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),
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add_file_common_args = True,
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supports_check_mode = True
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)
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deploy_helper = DeployHelper(module)
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facts = deploy_helper.gather_facts()
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result = {
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'state': deploy_helper.state
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}
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changes = 0
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if deploy_helper.state == 'query':
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result['ansible_facts'] = { 'deploy_helper': facts }
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elif deploy_helper.state == 'present':
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deploy_helper.check_link(facts['current_path'])
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changes += deploy_helper.create_path(facts['project_path'])
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changes += deploy_helper.create_path(facts['releases_path'])
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if deploy_helper.shared_path:
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changes += deploy_helper.create_path(facts['shared_path'])
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result['ansible_facts'] = { 'deploy_helper': facts }
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elif deploy_helper.state == 'finalize':
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if not deploy_helper.release:
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module.fail_json(msg="'release' is a required parameter for state=finalize (try the 'deploy_helper.new_release' fact)")
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if deploy_helper.keep_releases <= 0:
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module.fail_json(msg="'keep_releases' should be at least 1")
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changes += deploy_helper.remove_unfinished_file(facts['new_release_path'])
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changes += deploy_helper.create_link(facts['new_release_path'], facts['current_path'])
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if deploy_helper.clean:
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changes += deploy_helper.remove_unfinished_builds(facts['releases_path'])
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changes += deploy_helper.cleanup(facts['releases_path'])
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elif deploy_helper.state == 'clean':
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changes += deploy_helper.remove_unfinished_builds(facts['releases_path'])
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changes += deploy_helper.cleanup(facts['releases_path'])
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elif deploy_helper.state == 'absent':
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# destroy the facts
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result['ansible_facts'] = { 'deploy_helper': [] }
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changes += deploy_helper.delete_path(facts['project_path'])
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if changes > 0:
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result['changed'] = True
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else:
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result['changed'] = False
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module.exit_json(**result)
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# import module snippets
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from ansible.module_utils.basic import *
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main()
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