initial draft acl module

Signed-off-by: Brian Coca <briancoca+dev@gmail.com>

files/acl

@@ -0,0 +1,156 @@
+#!/usr/bin/python
+# 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: acl
+version_added: "1.3"
+short_description: set and retrieve file acl
+description:
+     - Sets and retrivies acl for a file
+options:
+  name:
+    required: true
+    default: None
+    description:
+      - The full path of the file/object to get the facts of
+    aliases: ['path']
+  entry:
+    required: false
+    default: None
+    description:
+      - The acl to set/remove. MUST always quote! In form of '<type>:<qualifier>:<perms>', qualifier may be empty for some types but type and perms are always requried. '-' can be used as placeholder when you don't care about permissions.
+  state:
+    required: false
+    default: get
+    choices: [ 'get', 'present', 'absent' ]
+    description:
+      - defines which operation you want to do. C(get) get the current acl C(present) sets/changes the acl, requires entry field C(absent) deletes the acl, requires entry field
+  follow:
+    required: false
+    default: yes
+    choices: [ 'yes', 'no' ]
+    description:
+      - if yes, dereferences symlinks and sets/gets attributes on symlink target, otherwise acts on symlink itself.
+author: Brian Coca
+notes:
+    - The "acl" module requires that acl is enabled on the target filesystem and that the setfacl and getfacl binaries are installed.
+'''
+
+EXAMPLES = '''
+# Obtain the acl of /etc/foo.conf
+- acl: name=/etc/foo.conf
+
+# Grants joe read access to foo
+- acl: name=/etc/foo.conf entry="u:joe:r" state=present
+
+# Removes the acl for joe
+- acl: name=/etc/foo.conf entry="u:joe" state=absent
+'''
+
+try:
+    import posix1e
+except:
+    module.fail_json(msg="Could not import required module pylibacl (posix1e)")
+
+def main():
+    module = AnsibleModule(
+        argument_spec = dict(
+            name = dict(required=True,aliases=['path']),
+            entry = dict(required=False, default=None),
+            state = dict(required=False, default='get', choices=[ 'get', 'present', 'absent' ], type='str'),
+            follow = dict(required=False, type='bool', default=True),
+        ),
+        supports_check_mode=True,
+    )
+    path = module.params.get('name')
+    entry = module.params.get('entry')
+    state = module.params.get('state')
+    follow = module.params.get('follow')
+
+    if not os.path.exists(path):
+        module.fail_json(msg="path not found or not accessible!")
+
+    if entry is None and state in ['present','absent']:
+        module.fail_json(msg="%s needs entry to be set" % state)
+
+    if entry.count(":") != 3:
+        module.fail_json(msg="Invalid entry: '%s', it requires 3 sections divided by ':'" % entry)
+
+    changed=False
+    changes=0
+    msg = ""
+    currentacl = posix1e.ACL(file=path)
+    newacl = currentacl
+    res = currentacl
+
+    if (state == 'present'):
+        for newe in posix1e.ACL(text=entry):
+            matched = False
+            for olde in currentacl:
+                diff = False
+                if olde.tag_type == newe.tag_type:
+                    if newe.tag_type in [ posix1e.ACL_GROUP, posix1e.ACL_USER ]:
+                        if olde.qualifier == newe.qualifier:
+                            matched = True
+                            if not str(olde.permset) == str(newe.permset):
+                                diff = True
+                    else:
+                        matched = True
+                        if not str(olde.permset) == str(newe.permset):
+                            diff = True
+                if diff:
+                    newacl.delete_entry(olde)
+                    newacl.append(newe)
+                    changes=changes+1
+                if matched:
+                    break
+            if not matched:
+                newacl.append(newe)
+                changes=changes+1
+        msg="%s is present" % (entry)
+    elif state == 'absent':
+        for rme in posix1e.ACL(text=entry):
+            for olde in currentacl:
+                if olde.tag_type == rme.tag_type:
+                    if rme.tag_type in [ posix1e.ACL_GROUP, posix1e.ACL_USER ]:
+                        if olde.qualifier == rme.qualifier:
+                            newacl.delete_entry(olde)
+                            changes=changes+1
+                            break
+                    else:
+                        newacl.delete_entry(olde)
+                        changes=changes+1
+                        break
+        msg="%s is absent" % (entry)
+    else:
+        msg="current acl"
+
+    if changes > 0:
+        if not newacl.valid():
+            module.fail_json("Invalid acl constructed: %s" % newacl.to_any_text())
+        if not module.check_mode:
+            newacl.applyto(path)
+        changed=True
+        res=newacl
+
+    msg="%s. %d entries changed" % (msg,changes)
+    module.exit_json(changed=changed, msg=msg, acl=res.to_any_text().split())
+
+# this is magic, see lib/ansible/module_common.py
+#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
+
+main()