Add upgrade command

cmd/fdroidcl/main.go

@@ -152,6 +152,7 @@ var commands = []*Command{
 	cmdDevices,
 	cmdDownload,
 	cmdInstall,
+	cmdUpgrade,
 	cmdUninstall,
 	cmdDefaults,
 }

cmd/fdroidcl/upgrade.go

@@ -0,0 +1,33 @@
+// Copyright (c) 2015, Daniel Martí <mvdan@mvdan.cc>
+// See LICENSE for licensing information
+
+package main
+
+import (
+	"log"
+)
+
+var cmdUpgrade = &Command{
+	UsageLine: "upgrade <appid...>",
+	Short:     "Upgrade an app",
+}
+
+func init() {
+	cmdUpgrade.Run = runUpgrade
+}
+
+func runUpgrade(args []string) {
+	if len(args) < 1 {
+		log.Fatalf("No package names given")
+	}
+	device := mustOneDevice()
+	apps := findApps(args)
+	inst := mustInstalled(device)
+	for _, app := range apps {
+		_, e := inst[app.ID]
+		if !e {
+			log.Fatalf("%s is not installed", app.ID)
+		}
+	}
+	downloadAndInstall(apps, device)
+}