fixup! Introduce an InstallMonitor

Monitor together all buildout using the cache

Store the git database in a place that will be ignored by other
buildouts

src/zc/buildout/install_monitor.py

@@ -60,15 +60,16 @@ class GitInstallMonitor(object):
     """
     def __init__(self, buildout):
         self._buildout = buildout
-        self._logger = logging.getLogger('zc.buildout.installmonitor')
+        self._logger = logging.getLogger('slapos.buildout.installmonitor')
         self._start_install_time = {}
 
     def _record_changes(self, message):
+        start = time.time()
         self._logger.debug("Adding %s to git, this may take some time", self._work_tree)
         if self._git("status", "--porcelain"):
             self._git("add", self._work_tree)
             self._git("commit", "-m", message)
-            self._logger.debug("Added %s to git", self._work_tree)
+            self._logger.debug("Added %s to git in %.2f seconds", self._work_tree, time.time() - start)
         else:
             self._logger.info("No changes to record")
 
@@ -97,8 +98,8 @@ class GitInstallMonitor(object):
                 self._buildout['buildout']['slapos-recipe-cmmi-shared-path'],
             )))
         self._git_dir = os.path.join(
-            self._buildout['buildout']['directory'],
-            'slapos.gitinstallmonitor.git'
+            self._work_tree,
+            'slapos.buildout.installmonitor.git'
         )
 
         self._git("init")
@@ -110,9 +111,13 @@ class GitInstallMonitor(object):
 
         # ignore git dir ( as a path relative to work tree )
         with open(os.path.join(self._git_dir, 'info', 'exclude'), 'w') as gitignore:
-            gitignore.write(self._git_dir[len(self._work_tree):])
+            gitignore.write('slapos.buildout.installmonitor.git')
+
+        software_release = os.path.basename(
+            self._buildout['buildout']['directory'])
 
-        self._record_changes("Begin install with args {install_args}".format(**locals()))
+        self._record_changes(
+            "Begin install {software_release} with args {install_args}".format(**locals()))
 
     def end_install(self):
         took = time.time() - self._start_install_time[self]