Added tracking of a specific git branch; added pulling for new repo updates

lib/Formula.py

@@ -40,9 +40,20 @@ class Formula():
             local_path = str(self.formulas_dir) + '/' + str(self.formula_def) + '-formula'
         else:
             # entry type is not supported
-            print('One of your formula entries is not a dict or a string (' + str(formula_def) + ') - please fix this.')
+            print('One of your formula entries is not a dict or a string (' + str(self.formula_def) + ') - please fix this.')
             sys.exit(1)
 
         # set the class values here
         self.git_url = git_url
         self.local_path = local_path
+
+    # checks to see if a branch, tag, or commit to track has been defined
+    def get_tracking_state(self):
+        if 'track_branch' in self.formula_def:
+            return 0, self.formula_def['track_branch']
+        elif 'track_tag' in self.formula_def:
+            return 1, self.formula_def['track_tag']
+        elif 'track_commit' in self.formula_def:
+            return 2, self.formula_def['track_commit']
+        else:
+            return 0, False

lib/FormulaRepo.py

@@ -24,3 +24,31 @@ class FormulaRepo():
             # let the user know it's already downloaded so we'll update it later
             print(self.repo_path + ' already exists, so we\'re not downloading it again.')
             self.repo = Repo(self.repo_path)
+
+    # check if the repo is up to date
+    def check_tracking_info(self, tracking_key, tracking_value):
+        if tracking_key == 0:
+            # tracking a specific branch on the repo
+            if tracking_value != False:
+                repo_branch = self.repo.head.reference
+                # check to make sure that the current tracked branch is, in fact, what we want
+                if repo_branch != tracking_value:
+                    self.repo.head.reference = repo_branch
+
+            # let the user know which branch we're using
+            print('For %s, we\'re using the %s branch.' % (self.repo_path, self.repo.head.reference))
+        elif tracking_key == 1:
+            # tracking a specific tag on the repo
+            print('Tracking a tag')
+        elif tracking_key == 2:
+            # tracking a specific commit on the repo
+            print('Tracking a commit')
+        else:
+            # we shouldn't get here...
+            print('We shouldn\'t have a tracking key that is not 0, 1 or 2')
+
+    # pull any new updates for the repo
+    def pull_updates(self):
+        print('Pulling updates for %s.' % self.repo_path)
+        # git pull
+        self.repo.remotes.origin.pull()

salt-formula-manager.py

@@ -44,8 +44,13 @@ def get_formulas(formulas, formulas_dir, formulas_url):
         # retrieve our formula
         formula_repo.retrieve()
 
+        # get the repo tracking information from the formula definition
+        tracking_key, tracking_value = formula.get_tracking_state()
         # make sure our formula's repo is up-to-date with the latest tracked version
-        ## TODO
+        formula_repo.check_tracking_info(tracking_key, tracking_value)
+
+        # pull any new commits for the repo
+        formula_repo.pull_updates()
 
 # purge un-managed formulas
 def clean_formulas(conf):