Add log message when checking share option

slapos/recipe/cmmi/README.txt

@@ -1086,6 +1086,8 @@ Use option ``share`` to install a share pacakge.
     Uninstalling package.
     Uninstalling package-2.
     Installing package.
+    package: Checking whether package is installed at share path: /usr/local/bin
+    package: could not find promise "/usr/local/bin/mypackage.exe"
     package: [ENV] TMP = /sample_buildout/parts/package/tmp
     package: Extracting package to /sample_buildout/parts/package__compile__
     configure --prefix=/sample_buildout/parts/package
@@ -1110,6 +1112,7 @@ Do nothing if one package has been installed.
     >>> print system(buildout)
     Uninstalling package.
     Installing package.
+    package: Checking whether package is installed at share path: /usr/local/bin
     package: This shared package has been installed by other package
 
 For even more specific needs you can write your own recipe that uses

slapos/recipe/cmmi/__init__.py

@@ -184,10 +184,10 @@ class Recipe(object):
         
     def check_promises(self, log=None):
         result = True
+        log = logging.getLogger(self.name)
         for path in self.options['promises'].splitlines():
             if not os.path.exists(path):
                 result = False
-                if log is not None: 
                 log.warning('could not find promise "%s"' % path)
         return result
         
@@ -234,7 +234,9 @@ class Recipe(object):
         parts = []
 
         # In share mode, do nothing if package has been installed.
-        if (not self.options['share'] == '') and self.check_promises():
+        if (not self.options['share'] == ''):
+            log.info('Checking whether package is installed at share path: %s' % self.options['share'])
+            if self.check_promises(log):
                 log.info('This shared package has been installed by other package')
                 return parts