Support Volume Shadow Copy service for Windows/Mac Platforms

Allow "vss:true" in "storage" section to support -vss qualifier
in duplicacy (Volume Shadow Copy Service).

Note that this is primarily a Windows feature, although support
has been committed for Mac OS/X as well on APFS volumes.

This fixes issue #2 (feature request).

README.md

@@ -280,6 +280,7 @@ Field Name | Purpose | Required | Default Value
 ---------- | ------- | -------- | -------------
 name | Storage name to back up | Yes | None
 threads | Number of threads to use for backup | No | 1
+vss | Enable Volume Shadow Copy service | No | false
 
 Fields in the `copy` section (if one exists), are:
 

configBackup.go

@@ -95,6 +95,13 @@ func (config *ConfigFile) LoadConfig(verboseFlag bool, debugFlag bool) error {
 				} else {
 					storageMap["threads"] = "1"
 				}
+				// Default to vss:false if not otherwise specified
+				vssFlag := v.GetBool(key + ".vss")
+				if vssFlag {
+					storageMap["vss"] = "true"
+				} else {
+					storageMap["vss"] = "false"
+				}
 				config.backupInfo = append(config.backupInfo, storageMap)
 			} else {
 				break

duplicacy-util.go

@@ -417,8 +417,14 @@ func performBackup() error {
 			backupStartTime := time.Now()
 			logger.Println("######################################################################")
 			cmdArgs := []string{"backup", "-storage", configFile.backupInfo[i]["name"], "-threads", configFile.backupInfo[i]["threads"], "-stats"}
-			logMessage(logger, fmt.Sprint("Backing up to storage ", configFile.backupInfo[i]["name"],
-				" with ", configFile.backupInfo[i]["threads"], " threads"))
+			if configFile.backupInfo[i]["vss"] == "true" {
+				cmdArgs = append(cmdArgs, "-vss")
+				logMessage(logger, fmt.Sprint("Backing up to storage ", configFile.backupInfo[i]["name"],
+					" -vss with ", configFile.backupInfo[i]["threads"], " threads"))
+			} else {
+				logMessage(logger, fmt.Sprint("Backing up to storage ", configFile.backupInfo[i]["name"],
+					" with ", configFile.backupInfo[i]["threads"], " threads"))
+			}
 			if debugFlag {
 				logMessage(logger, fmt.Sprint("Executing: ", duplicacyPath, cmdArgs))
 			}

version

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-VERSION=1.1
+VERSION=1.2