Merge pull request #6149 from risaacson/issues_4986

This tests clean with the new integration tests.

lib/ansible/runner/action_plugins/script.py

@@ -16,6 +16,7 @@
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 
 import os
+import re
 import shlex
 
 import ansible.constants as C
@@ -24,8 +25,8 @@ from ansible import utils
 from ansible import errors
 from ansible.runner.return_data import ReturnData
 
-class ActionModule(object):
 
+class ActionModule(object):
     TRANSFERS_FILES = True
 
     def __init__(self, runner):
@@ -36,14 +37,64 @@ class ActionModule(object):
 
         if self.runner.noop_on_check(inject):
             # in check mode, always skip this module
-            return ReturnData(conn=conn, comm_ok=True, result=dict(skipped=True, msg='check mode not supported for this module'))
+            return ReturnData(conn=conn, comm_ok=True,
+                              result=dict(skipped=True, msg='check mode not supported for this module'))
+
+        # extract ansible reserved parameters
+        # From library/command keep in sync
+        creates = None
+        removes = None
+        r = re.compile(r'(^|\s)(creates|removes)=(?P<quote>[\'"])?(.*?)(?(quote)(?<!\\)(?P=quote))((?<!\\)(?=\s)|$)')
+        for m in r.finditer(module_args):
+            v = m.group(4).replace("\\", "")
+            if m.group(2) == "creates":
+                creates = v
+            elif m.group(2) == "removes":
+                removes = v
+        module_args = r.sub("", module_args)
+
+        if creates:
+            # do not run the command if the line contains creates=filename
+            # and the filename already exists. This allows idempotence
+            # of command executions.
+            module_args_tmp = "path=%s" % creates
+            module_return = self.runner._execute_module(conn, tmp, 'stat', module_args_tmp, inject=inject,
+                                                        complex_args=complex_args, persist_files=True)
+            stat = module_return.result.get('stat', None)
+            if stat and stat.get('exists', False):
+                return ReturnData(
+                    conn=conn,
+                    comm_ok=True,
+                    result=dict(
+                        skipped=True,
+                        msg=("skipped, since %s exists" % creates)
+                    )
+                )
+        if removes:
+            # do not run the command if the line contains removes=filename
+            # and the filename does not exist. This allows idempotence
+            # of command executions.
+            module_args_tmp = "path=%s" % removes
+            module_return = self.runner._execute_module(conn, tmp, 'stat', module_args_tmp, inject=inject,
+                                                        complex_args=complex_args, persist_files=True)
+            stat = module_return.result.get('stat', None)
+            if stat and not stat.get('exists', False):
+                return ReturnData(
+                    conn=conn,
+                    comm_ok=True,
+                    result=dict(
+                        skipped=True,
+                        msg=("skipped, since %s does not exist" % removes)
+                    )
+                )
 
         # Decode the result of shlex.split() to UTF8 to get around a bug in that's been fixed in Python 2.7 but not Python 2.6.
         # See: http://bugs.python.org/issue6988
         tokens = shlex.split(module_args.encode('utf8'))
         tokens = [s.decode('utf8') for s in tokens]
-
+        # extract source script
         source = tokens[0]
+
         # FIXME: error handling
         args = " ".join(tokens[1:])
         source = template.template(self.runner.basedir, source, inject)
@@ -53,18 +104,18 @@ class ActionModule(object):
             source = utils.path_dwim(self.runner.basedir, source)
 
         # transfer the file to a remote tmp location
-        source  = source.replace('\x00','') # why does this happen here?
-        args    = args.replace('\x00','') # why does this happen here?
+        source = source.replace('\x00', '')  # why does this happen here?
+        args = args.replace('\x00', '')  # why does this happen here?
         tmp_src = os.path.join(tmp, os.path.basename(source))
         tmp_src = tmp_src.replace('\x00', '')
 
         conn.put_file(source, tmp_src)
 
-        sudoable=True
+        sudoable = True
         # set file permissions, more permisive when the copy is done as a different user
         if self.runner.sudo and self.runner.sudo_user != 'root':
             cmd_args_chmod = "chmod a+rx %s" % tmp_src
-            sudoable=False
+            sudoable = False
         else:
             cmd_args_chmod = "chmod +rx %s" % tmp_src
         self.runner._low_level_exec_command(conn, cmd_args_chmod, tmp, sudoable=sudoable)

library/commands/script

@@ -18,6 +18,18 @@ options:
     required: true
     default: null
     aliases: []
+  creates:
+    description:
+      - a filename, when it already exists, this step will B(not) be run.
+    required: no
+    default: null
+    version_added: "1.5"
+  removes:
+    description:
+      - a filename, when it does not exist, this step will B(not) be run.
+    required: no
+    default: null
+    version_added: "1.5"
 notes:
   - It is usually preferable to write Ansible modules than pushing scripts. Convert your script to an Ansible module for bonus points!
 author: Michael DeHaan
@@ -26,4 +38,10 @@ author: Michael DeHaan
 EXAMPLES = '''
 # Example from Ansible Playbooks
 - script: /some/local/script.sh --some-arguments 1234
+
+# Run a script that creates a file, but only if the file is not yet created
+- script: /some/local/create_file.sh --some-arguments 1234 creates=/the/created/file.txt
+
+# Run a script that removes a file, but only if the file is not yet removed
+- script: /some/local/remove_file.sh --some-arguments 1234 removes=/the/removed/file.txt
 '''

test/integration/non_destructive.yml

@@ -34,3 +34,4 @@
     - { role: test_iterators, tags: test_iterators }
     - { role: test_command_shell, tags: test_command_shell }
     - { role: test_failed_when, tags: test_failed_when }
+    - { role: test_script, tags: test_script }
\ No newline at end of file

test/integration/roles/test_script/files/create_afile.sh

+#!/usr/bin/env bash
+
+echo "win" > "$1"
\ No newline at end of file

test/integration/roles/test_script/files/remove_afile.sh

+#!/usr/bin/env bash
+
+rm "$1"
\ No newline at end of file

test/integration/roles/test_script/files/test.sh

+#!/usr/bin/env bash
+
+echo -n "win"
\ No newline at end of file

test/integration/roles/test_script/meta/main.yml

+dependencies: 
+  - prepare_tests
+

test/integration/roles/test_script/tasks/main.yml

+# Test code for the script module and action_plugin.
+# (c) 2014, Richard Isaacson <richard.c.isaacson@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/>.
+
+##
+## prep
+##
+
+- set_fact: output_dir_test={{output_dir}}/test_script
+
+- name: make sure our testing sub-directory does not exist
+  file: path="{{ output_dir_test }}" state=absent
+
+- name: create our testing sub-directory
+  file: path="{{ output_dir_test }}" state=directory
+
+##
+## script
+##
+
+- name: execute the test.sh script via command
+  script: test.sh
+  register: script_result0
+
+- name: assert that the script executed correctly
+  assert:
+    that:
+      - "script_result0.rc == 0"
+      - "script_result0.stderr == ''"
+      - "script_result0.stdout == 'win'"
+
+# creates
+
+- name: verify that afile.txt is absent
+  file: path={{output_dir_test}}/afile.txt state=absent
+
+- name: create afile.txt with create_afile.sh via command
+  script: create_afile.sh {{output_dir_test | expanduser}}/afile.txt creates={{output_dir_test | expanduser}}/afile.txt
+
+- name: verify that afile.txt is present
+  file: path={{output_dir_test}}/afile.txt state=file
+
+# removes
+
+- name: remove afile.txt with remote_afile.sh via command
+  script: remove_afile.sh {{output_dir_test | expanduser}}/afile.txt removes={{output_dir_test | expanduser}}/afile.txt
+
+- name: verify that afile.txt is absent
+  file: path={{output_dir_test}}/afile.txt state=absent
+  register: script_result1
+
+- name: assert that the file was removed by the script
+  assert:
+    that:
+      - "script_result1.changed != True"