Added postwhite support. (#171)

* Added postwhite support.

see #109

* Fixed unit test.

modoboa_installer/scripts/postwhite.py

@@ -0,0 +1,51 @@
+"""postwhite related functions."""
+
+import os
+import shutil
+
+from .. import utils
+
+from . import base
+
+POSTWHITE_REPOSITORY = "https://github.com/stevejenkins/postwhite"
+SPF_TOOLS_REPOSITORY = "https://github.com/jsarenik/spf-tools"
+
+
+class Postwhite(base.Installer):
+    """Postwhite installer."""
+
+    appname = "postwhite"
+    config_files = [
+        "crontab=/etc/cron.d/postwhite",
+    ]
+    no_daemon = True
+    packages = {
+        "rpm": ["bind-utils"]
+    }
+
+    def install_from_archive(self, repository, target_dir):
+        """Install from an archive."""
+        url = "{}/archive/master.zip".format(repository)
+        target = os.path.join(target_dir, os.path.basename(url))
+        if os.path.exists(target):
+            os.unlink(target)
+        utils.exec_cmd("wget {}".format(url), cwd=target_dir)
+        app_name = os.path.basename(repository)
+        archive_dir = os.path.join(target_dir, app_name)
+        if os.path.exists(archive_dir):
+            shutil.rmtree(archive_dir)
+        utils.exec_cmd("unzip master.zip", cwd=target_dir)
+        utils.exec_cmd(
+            "mv {name}-master {name}".format(name=app_name), cwd=target_dir)
+        os.unlink(target)
+        return archive_dir
+
+    def post_run(self):
+        """Additionnal tasks."""
+        install_dir = "/usr/local/bin"
+        self.install_from_archive(SPF_TOOLS_REPOSITORY, install_dir)
+        postw_dir = self.install_from_archive(
+            POSTWHITE_REPOSITORY, install_dir)
+        utils.copy_file(os.path.join(postw_dir, "postwhite.conf"), "/etc")
+        postw_bin = os.path.join(postw_dir, "postwhite")
+        utils.exec_cmd("{} /etc/postwhite.conf".format(postw_bin))