Add support for s3fs

pillar.example

@@ -20,10 +20,18 @@ salt:
   master:
     fileserver_backend:
       - git
+      - s3fs
       - roots
     gitfs_remotes:
       - git://github.com/saltstack-formulas/salt-formula.git:
         - base: develop
+    s3.keyid: GKTADJGHEIQSXMKKRBJ08H
+    s3.key: askdjghsdfjkghWupUjasdflkdfklgjsdfjajkghs
+    s3.buckets:
+      - bucket1
+      - bucket2
+      - bucket3
+      - bucket4
     file_roots:
       base:
         - /srv/salt

salt/files/master.d/f_defaults.conf

@@ -859,6 +859,51 @@ gitfs_env_blacklist:
 #   - feature/*
 {% endif %}
 
+# S3 File Server Backend Configuration
+#
+# S3 credentials must be set in the master config file.
+# Alternatively, if on EC2 these credentials can be automatically
+# loaded from instance metadata.
+{% if 's3.keyid' in cfg_master -%}
+{{ get_config('s3.keyid', '<no default>') }}
+{{ get_config('s3.key', '<no default>') }}
+{% else -%}
+# s3.keyid: GKTADJGHEIQSXMKKRBJ08H
+# s3.key: askdjghsdfjkghWupUjasdflkdfklgjsdfjajkghs
+{% endif %}
+# This fileserver supports two modes of operation for the buckets:
+# - A single bucket per environment
+# - Multiple environments per bucket
+#
+# Note that bucket names must be all lowercase both in the AWS console
+# and in Salt, otherwise you may encounter SignatureDoesNotMatch
+# errors.
+#
+# A multiple-environment bucket must adhere to the following root
+# directory structure:
+#
+# s3://<bucket name>/<environment>/<files>
+#
+# This fileserver back-end requires the use of the MD5 hashing
+# algorithm. MD5 may not be compliant with all security policies.
+{% if 's3.buckets' in cfg_master -%}
+{{ get_config('s3.buckets', '<no default>') }}
+{% else -%}
+# s3.buckets:                     #single bucket per environment
+#   production:
+#     - bucket1
+#     - bucket2
+#   staging:
+#     - bucket3
+#     - bucket4
+#
+# s3.buckets:                     #multiple environments per bucket
+#   - bucket1
+#   - bucket2
+#   - bucket3
+#   - bucket4
+{% endif %}
+
 #####         Pillar settings        #####
 ##########################################
 # Salt Pillars allow for the building of global data that can be made selectively