--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/piecrust/admin/siteinfo.py	Tue Jun 20 21:13:08 2017 -0700
@@ -0,0 +1,91 @@
+import os
+import os.path
+import sys
+import copy
+import logging
+import threading
+import subprocess
+from piecrust.app import PieCrustFactory
+
+
+logger = logging.getLogger(__name__)
+
+
+class UnauthorizedSiteAccessError(Exception):
+    pass
+
+
+class InvalidSiteError(Exception):
+    pass
+
+
+class SiteInfo:
+    def __init__(self, root_dir, url_prefix, *, debug=False):
+        self.root_dir = root_dir
+        self.url_prefix = url_prefix
+        self.debug = debug
+        self._piecrust_factory = None
+        self._piecrust_app = None
+        self._scm = None
+
+    @property
+    def piecrust_factory(self):
+        if self._piecrust_factory is None:
+            self._piecrust_factory = PieCrustFactory(
+                self.root_dir,
+                cache_key='admin',
+                debug=self.debug,
+                config_values=[
+                    ('site/root', '%s/preview/' % self.url_prefix),
+                    ('site/asset_url_format',
+                     self.url_prefix + '/preview/_asset/%path%')
+                ])
+        return self._piecrust_factory
+
+    @property
+    def piecrust_app(self):
+        if self._piecrust_app is None:
+            logger.debug("Creating PieCrust admin app: %s" % self.root_dir)
+            self._piecrust_app = self.piecrust_factory.create()
+        return self._piecrust_app
+
+    @property
+    def scm(self):
+        if self._scm is None:
+            cfg = copy.deepcopy(self.piecrust_app.config.get('scm', {}))
+
+            if os.path.isdir(os.path.join(self.root_dir, '.hg')):
+                from .scm.mercurial import MercurialSourceControl
+                self._scm = MercurialSourceControl(self.root_dir, cfg)
+            elif os.path.isdir(os.path.join(self.root_dir, '.git')):
+                from .scm.git import GitSourceControl
+                self._scm = GitSourceControl(self.root_dir, cfg)
+            else:
+                self._scm = False
+
+        return self._scm
+
+    @property
+    def publish_pid_file(self):
+        return os.path.join(self.piecrust_app.cache_dir, 'publish.pid')
+
+    @property
+    def publish_log_file(self):
+        return os.path.join(self.piecrust_app.cache_dir, 'publish.log')
+
+    def publish(self, target):
+        args = [
+            sys.executable, sys.argv[0],
+            '--pid-file', self.publish_pid_file,
+            'publish',
+            '--log-publisher', self.publish_log_file,
+            target]
+        logger.debug("Running publishing command: %s" % args)
+        proc = subprocess.Popen(args, cwd=self.root_dir)
+
+        def _comm():
+            proc.communicate()
+
+        t = threading.Thread(target=_comm, daemon=True)
+        t.start()
+