support for --overwrite flag

bob/cli.py

@@ -1,13 +1,13 @@
 # -*- coding: utf-8 -*-
 
 """Usage: bob build <formula>
-       bob deploy <formula>
+       bob deploy <formula> [--overwrite]
 
 Build formula and optionally deploy it.
 
 Options:
     -h --help
-    --no-deps  skip dependency cascading.
+    --overwrite  allow overwriting of deployed archives.
 
 Configuration:
     Environment Variables: AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_BUCKET
@@ -53,14 +53,14 @@ def build(formula):
     # Then, sidestep.
 
 
-def deploy(formula):
+def deploy(formula, overwrite):
     f = build(formula)
 
     print 'Archiving.'
     f.archive()
 
     print 'Deploying.'
-    f.deploy()
+    f.deploy(allow_overwrite=overwrite)
 
 
 
@@ -71,9 +71,11 @@ def dispatch():
     formula = args['<formula>']
     do_build = args['build']
     do_deploy = args['deploy']
+    do_overwrite = args['--overwrite']
+
 
     if do_build:
         build(formula)
 
     if do_deploy:
-        deploy(formula)
+        deploy(formula, overwrite=do_overwrite)

bob/models.py

@@ -79,19 +79,24 @@ class Formula(object):
         self.archive_path = archive
 
 
-    def deploy(self):
-        # TODO: potential support for optional prefix?
-        # TODO: overwrite flag, default to off
+    def deploy(self, allow_overwrite=False):
+        """Deploys the formula's archive to S3."""
         assert self.archive_path
 
-        k = Key(bucket)
-        k.key = '{}.tar.gz'.format(self.path)
+        key_name = '{}.tar.gz'.format(self.path)
+        key = bucket.get_key(key_name)
+
+        if key:
+            if not allow_overwrite:
+                print 'WARNING: {} already exists. Use the --overwrite flag to continue.'
+                exit()
+        else:
+            key = bucket.new_key(key_name
+
+        # Upload the archive, set permissions.
         k.set_contents_from_filename(self.archive_path)
         k.set_acl('public-read')
 
 
 
 
-
-
-