Add new module "patch"

2 files changed, 150 insertions, 0 deletions

diff --git a/files/__init__.py b/files/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/files/__init__.py
diff --git a/files/patch.py b/files/patch.py
new file mode 100644
index 00000000..e2e5467f
--- /dev/null
+++ b/files/patch.py
@@ -0,0 +1,150 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# (c) 2012, Luis Alberto Perez Lazaro <luisperlazaro@gmail.com>
+# (c) 2015, Jakub Jirutka <jakub@jirutka.cz>
+#
+# 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/>.
+
+DOCUMENTATION = '''
+---
+module: patch
+author: Luis Alberto Perez Lazaro, Jakub Jirutka
+version_added: 1.8
+short_description: Apply patch files using the GNU patch tool.
+options:
+  basedir:
+    description:
+      - Path of a base directory in which the patch file will be applied.
+        May be ommitted when C(dest) option is specified, otherwise required.
+    required: false
+  dest:
+    description:
+      - Path of the file on the remote machine to be patched.
+      - The names of the files to be patched are usually taken from the patch
+        file, but if there's just one file to be patched it can specified with
+        this option.
+    required: false
+    aliases: [ "originalfile" ]
+  src:
+    description:
+      - Path of the patch file on the remote machine as accepted by the GNU
+        patch tool.
+    required: true
+    aliases: [ "patchfile" ]
+  strip:
+    description:
+      - Number that indicates the smallest prefix containing leading slashes
+        that will be stripped from each file name found in the patch file.
+        For more information see the strip parameter of the GNU patch tool.
+    required: false
+    type: "int"
+    default: "0"
+note:
+  - This module requires GNU I(patch) utility to be installed on the remote host.
+'''
+
+EXAMPLES = '''
+- name: apply patch to one file
+  patch: >
+    src=/tmp/index.html.patch
+    dest=/var/www/index.html
+
+- name: apply patch to multiple files under basedir
+  patch: >
+    src=/tmp/customize.patch
+    basedir=/var/www
+    strip=1
+'''
+
+import os
+from os import path, R_OK, W_OK
+
+
+class PatchError(Exception):
+    pass
+
+
+def is_already_applied(patch_func, patch_file, basedir, dest_file=None, strip=0):
+    opts = ['--quiet', '--reverse', '--forward', '--dry-run',
+            "--strip=%s" % strip, "--directory='%s'" % basedir,
+            "--input='%s'" % patch_file]
+    if dest_file:
+        opts.append("'%s'" % dest_file)
+
+    (rc, _, _) = patch_func(opts)
+    return rc == 0
+
+
+def apply_patch(patch_func, patch_file, basedir, dest_file=None, strip=0, dry_run=False):
+    opts = ['--quiet', '--forward', '--batch', '--reject-file=-',
+            "--strip=%s" % strip, "--directory='%s'" % basedir,
+            "--input='%s'" % patch_file]
+    if dry_run:
+        opts.append('--dry-run')
+    if dest_file:
+        opts.append("'%s'" % dest_file)
+
+    (rc, out, err) = patch_func(opts)
+    if rc != 0:
+        msg = out if not err else err
+        raise PatchError(msg)
+
+
+def main():
+    module = AnsibleModule(
+        argument_spec={
+            'src':     {'required': True, 'aliases': ['patchfile']},
+            'dest':    {'aliases': ['originalfile']},
+            'basedir': {},
+            'strip':   {'default': 0, 'type': 'int'}
+        },
+        required_one_of=[['dest', 'basedir']],
+        supports_check_mode=True
+    )
+
+    # Create type object as namespace for module params
+    p = type('Params', (), module.params)
+
+    if not os.access(p.src, R_OK):
+        module.fail_json(msg="src %s doesn't exist or not readable" % (p.src))
+
+    if p.dest and not os.access(p.dest, W_OK):
+        module.fail_json(msg="dest %s doesn't exist or not writable" % (d.dest))
+
+    if p.basedir and not path.exists(p.basedir):
+        module.fail_json(msg="basedir %s doesn't exist" % (p.basedir))
+
+    if not p.basedir:
+        p.basedir = path.dirname(p.dest)
+
+    patch_bin = module.get_bin_path('patch')
+    patch_func = lambda opts: module.run_command("%s %s" % (patch_bin, ' '.join(opts)))
+
+    changed = False
+    if not is_already_applied(patch_func, p.src, p.basedir, dest_file=p.dest, strip=p.strip):
+        try:
+            apply_patch(patch_func, p.src, p.basedir, dest_file=p.dest, strip=p.strip,
+                        dry_run=module.check_mode)
+            changed = True
+        except PatchError, e:
+            module.fail_json(msg=str(e))
+
+    module.exit_json(changed=changed)
+
+# import module snippets
+from ansible.module_utils.basic import *
+main()