add jail module, based on lxc and chroot connexion plugin

lib/ansible/runner/connection_plugins/jail.py

+# Based on local.py (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
+# and chroot.py     (c) 2013, Maykel Moya <mmoya@speedyrails.com>
+# (c) 2013, Michael Scherer <misc@zarb.org>
+#
+# 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/>.
+
+import distutils.spawn
+import traceback
+import os
+import shutil
+import subprocess
+from ansible import errors
+from ansible.callbacks import vvv
+
+class Connection(object):
+    ''' Local chroot based connections '''
+
+    def _search_executable(self, executable):
+        cmd = distutils.spawn.find_executable(executable)
+        if not cmd:
+            raise errors.AnsibleError("%s command not found in PATH") % executable
+        return cmd
+
+    def list_jails(self):
+        p = subprocess.Popen([self.jls_cmd, '-q', 'name'],
+                             cwd=self.runner.basedir,
+                             stdin=subprocess.PIPE,
+                             stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+
+        stdout, stderr = p.communicate()
+
+        return stdout.split()
+
+    def get_jail_path(self):
+        p = subprocess.Popen([self.jls_cmd, '-j', self.jail, '-q', 'path'],
+                             cwd=self.runner.basedir,
+                             stdin=subprocess.PIPE,
+                             stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+
+        stdout, stderr = p.communicate()
+        # remove \n
+        return stdout[:-1]
+
+ 
+        
+    def __init__(self, runner, host, port, *args, **kwargs):
+        self.jail = host
+        self.runner = runner
+        self.host = host
+
+        if os.geteuid() != 0:
+            raise errors.AnsibleError("jail connection requires running as root")
+
+        self.jls_cmd = self._search_executable('jls')
+        self.jexec_cmd = self._search_executable('jexec')
+        
+        if not self.jail in self.list_jails():
+            raise errors.AnsibleError("incorrect jail name %s" % self.jail)
+
+
+        self.host = host
+        # port is unused, since this is local
+        self.port = port
+
+    def connect(self, port=None):
+        ''' connect to the chroot; nothing to do here '''
+
+        vvv("THIS IS A LOCAL CHROOT DIR", host=self.jail)
+
+        return self
+
+    # a modifier
+    def _generate_cmd(self, executable, cmd):
+        if executable:
+            local_cmd = [self.jexec_cmd, self.jail, executable, '-c', cmd]
+        else:
+            local_cmd = '%s "%s" %s' % (self.jexec_cmd, self.jail, cmd)
+        return local_cmd
+
+    def exec_command(self, cmd, tmp_path, sudo_user, sudoable=False, executable='/bin/sh'):
+        ''' run a command on the chroot '''
+
+        # We enter chroot as root so sudo stuff can be ignored
+        local_cmd = self._generate_cmd(executable, cmd)
+
+        vvv("EXEC %s" % (local_cmd), host=self.jail)
+        p = subprocess.Popen(local_cmd, shell=isinstance(local_cmd, basestring),
+                             cwd=self.runner.basedir,
+                             stdin=subprocess.PIPE,
+                             stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+
+        stdout, stderr = p.communicate()
+        return (p.returncode, '', stdout, stderr)
+
+    def _normalize_path(self, path, prefix):
+        if not path.startswith(os.path.sep):
+            path = os.path.join(os.path.sep, path)
+        normpath = os.path.normpath(path)
+        return os.path.join(prefix, normpath[1:])
+
+    def _copy_file(self, in_path, out_path):
+        if not os.path.exists(in_path):
+            raise errors.AnsibleFileNotFound("file or module does not exist: %s" % in_path)
+        try:
+            shutil.copyfile(in_path, out_path)
+        except shutil.Error:
+            traceback.print_exc()
+            raise errors.AnsibleError("failed to copy: %s and %s are the same" % (in_path, out_path))
+        except IOError:
+            traceback.print_exc()
+            raise errors.AnsibleError("failed to transfer file to %s" % out_path)
+
+    def put_file(self, in_path, out_path):
+        ''' transfer a file from local to chroot '''
+
+        out_path = self._normalize_path(out_path, self.get_jail_path() )
+        vvv("PUT %s TO %s" % (in_path, out_path), host=self.jail)
+
+        self._copy_file(in_path, out_path)
+
+    def fetch_file(self, in_path, out_path):
+        ''' fetch a file from chroot to local '''
+
+        in_path = self._normalize_path(in_path, self.get_jail_path())
+        vvv("FETCH %s TO %s" % (in_path, out_path), host=self.jail)
+
+        self._copy_file(in_path, out_path)
+
+    def close(self):
+        ''' terminate the connection; nothing to do here '''
+        pass