public int run(String[] args) throws Exception {
if (args.length == 0) {
System.err.println("Usage: MigrationTool <S3 file system URI>");
System.err.println("\t<S3 file system URI>\tfilesystem to migrate");
ToolRunner.printGenericCommandUsage(System.err);
return -1;
}
URI uri = URI.create(args[0]);
initialize(uri);
FileSystemStore newStore = new Jets3tFileSystemStore();
newStore.initialize(uri, getConf());
if (get("%2F") != null) {
System.err.println("Current version number is [unversioned].");
System.err.println("Target version number is " + newStore.getVersion() + ".");
Store oldStore = new UnversionedStore();
migrate(oldStore, newStore);
return 0;
} else {
S3Object root = get("/");
if (root != null) {
String version = (String) root.getMetadata("fs-version");
if (version == null) {
System.err.println("Can't detect version - exiting.");
} else {
String newVersion = newStore.getVersion();
System.err.println("Current version number is " + version + ".");
System.err.println("Target version number is " + newVersion + ".");
if (version.equals(newStore.getVersion())) {
System.err.println("No migration required.");
return 0;
}
// use version number to create Store
// Store oldStore = ...
// migrate(oldStore, newStore);
System.err.println("Not currently implemented.");
return 0;
}
}
System.err.println("Can't detect version - exiting.");
return 0;
}
}
