write commented json default config

debian/aptly.conf

@@ -1,6 +1,6 @@
 // vim: : filetype=json
 // json configuration file with comments
-// validate with: sed '/\/\//d' debian/aptly.conf | json_pp
+// validate with: sed '/\/\//d' aptly.conf | json_pp
 {
 
 // General
@@ -30,7 +30,7 @@
   "logFormat": "default",
 
   // Default Architectures
-  // * empty defaults to all available architectures
+  // empty array defaults to all available architectures
   "architectures": [],
 
   // Follow contents of `Suggests:` field when processing dependencies for the package
@@ -49,7 +49,7 @@
   "dependencyVerboseResolve": false,
 
   // Specifies paramaters for short PPA url expansion
-  // * empty defaults to output of `lsb_release` command
+  // empty defaults to output of `lsb_release` command
   "ppaDistributorID": "ubuntu",
 
   // Codename for short PPA url expansion
@@ -84,14 +84,20 @@
 ////////////
 
   // Database backend
+  // Type must be one of:
+  // * leveldb (default)
+  // * etcd
   "databaseBackend": {
-    //
-    "type": "",
-    //
-    "url": "",
-    //
+    // LevelDB
+    "type": "leveldb",
+    // Path to leveldb files
+    // empty dbPath defaults to `rootDir`/db
     "dbPath": ""
-    //
+
+    // // etcd
+    // "type": "etcd",
+    // // URL to db server
+    // "url": "127.0.0.1:2379"
   },
 
 
@@ -171,7 +177,7 @@
     //    // File Copare Method for comparing existing links from the internal pool to the published directory
     //    // Only used when "linkMethod" is set to "copy"
     //    // * md5 (default: compare md5 sum)
-    //    // * size (only compare file size)
+    //    // * size (compare file size)
     //    "verifyMethod": "md5"
     // }
   },
@@ -325,7 +331,7 @@
     //
     //    // Endpoint URL
     //    // See: Azure documentation https://docs.microsoft.com/en-us/azure/storage/common/storage-configure-connection-string
-    //    // defaults to "https://$accountName.blob.core.windows.net"
+    //    // defaults to "https://<accountName>.blob.core.windows.net"
     //    "endpoint": ""
     // }
   },
@@ -336,9 +342,11 @@
   // * local
   // * azure
   "packagePoolStorage": {
-    // Local Pool Path
+    // Local Pool
     "type": "local",
-    "path": "$ROOTDIR/pool"
+    // Local Pool Path
+    // empty path defaults to `rootDir`/pool
+    "path": ""
 
     // // Azure Azure Blob Storage Pool
     // "type": "azure",
@@ -357,7 +365,7 @@
     //
     //    // Endpoint URL
     //    // See: Azure documentation https://docs.microsoft.com/en-us/azure/storage/common/storage-configure-connection-string
-    //    // defaults to "https://$accountName.blob.core.windows.net"
+    //    // defaults to "https://<accountName>.blob.core.windows.net"
     //    "endpoint": ""
     // }
   }