--- /dev/null
+//
+// Getdown - application installer, patcher and launcher
+// Copyright (C) 2004-2018 Getdown authors
+// https://github.com/threerings/getdown/blob/master/LICENSE
+
+package com.threerings.getdown.util;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+import java.util.Locale;
+
+import static com.threerings.getdown.Log.log;
+
+/**
+ * Useful routines for launching Java applications from within other Java
+ * applications.
+ */
+public class LaunchUtil
+{
+ /** The directory into which a local VM installation should be unpacked. */
+ public static final String LOCAL_JAVA_DIR = "java_vm";
+
+ /**
+ * Writes a <code>version.txt</code> file into the specified application directory and
+ * attempts to relaunch Getdown in that directory which will cause it to upgrade to the newly
+ * specified version and relaunch the application.
+ *
+ * @param appdir the directory in which the application is installed.
+ * @param getdownJarName the name of the getdown jar file in the application directory. This is
+ * probably <code>getdown-pro.jar</code> or <code>getdown-retro-pro.jar</code> if you are using
+ * the results of the standard build.
+ * @param newVersion the new version to which Getdown will update when it is executed.
+ *
+ * @return true if the relaunch succeeded, false if we were unable to relaunch due to being on
+ * Windows 9x where we cannot launch subprocesses without waiting around for them to exit,
+ * reading their stdout and stderr all the while. If true is returned, the application may exit
+ * after making this call as it will be upgraded and restarted. If false is returned, the
+ * application should tell the user that they must restart the application manually.
+ *
+ * @exception IOException thrown if we were unable to create the <code>version.txt</code> file
+ * in the supplied application directory. If the version.txt file cannot be created, restarting
+ * Getdown will not cause the application to be upgraded, so the application will have to
+ * resort to telling the user that it is in a bad way.
+ */
+ public static boolean updateVersionAndRelaunch (
+ File appdir, String getdownJarName, String newVersion)
+ throws IOException
+ {
+ // create the file that instructs Getdown to upgrade
+ File vfile = new File(appdir, "version.txt");
+ try (PrintStream ps = new PrintStream(new FileOutputStream(vfile))) {
+ ps.println(newVersion);
+ }
+
+ // make sure that we can find our getdown.jar file and can safely launch children
+ File pro = new File(appdir, getdownJarName);
+ if (mustMonitorChildren() || !pro.exists()) {
+ return false;
+ }
+
+ // do the deed
+ String[] args = new String[] {
+ getJVMPath(appdir), "-jar", pro.toString(), appdir.getPath()
+ };
+ log.info("Running " + StringUtil.join(args, "\n "));
+ try {
+ Runtime.getRuntime().exec(args, null);
+ return true;
+ } catch (IOException ioe) {
+ log.warning("Failed to run getdown", ioe);
+ return false;
+ }
+ }
+
+ /**
+ * Reconstructs the path to the JVM used to launch this process.
+ */
+ public static String getJVMPath (File appdir)
+ {
+ return getJVMPath(appdir, false);
+ }
+
+ /**
+ * Reconstructs the path to the JVM used to launch this process.
+ *
+ * @param windebug if true we will use java.exe instead of javaw.exe on Windows.
+ */
+ public static String getJVMPath (File appdir, boolean windebug)
+ {
+ // first look in our application directory for an installed VM
+ String vmpath = checkJVMPath(new File(appdir, LOCAL_JAVA_DIR).getAbsolutePath(), windebug);
+ if (vmpath == null && isMacOS()) {
+ vmpath = checkJVMPath(new File(appdir, LOCAL_JAVA_DIR + "/Contents/Home").getAbsolutePath(), windebug);
+ }
+
+ // then fall back to the VM in which we're already running
+ if (vmpath == null) {
+ vmpath = checkJVMPath(System.getProperty("java.home"), windebug);
+ }
+
+ // then throw up our hands and hope for the best
+ if (vmpath == null) {
+ log.warning("Unable to find java [appdir=" + appdir +
+ ", java.home=" + System.getProperty("java.home") + "]!");
+ vmpath = "java";
+ }
+
+ // Oddly, the Mac OS X specific java flag -Xdock:name will only work if java is launched
+ // from /usr/bin/java, and not if launched by directly referring to <java.home>/bin/java,
+ // even though the former is a symlink to the latter! To work around this, see if the
+ // desired jvm is in fact pointed to by /usr/bin/java and, if so, use that instead.
+ if (isMacOS()) {
+ try {
+ File localVM = new File("/usr/bin/java").getCanonicalFile();
+ if (localVM.equals(new File(vmpath).getCanonicalFile())) {
+ vmpath = "/usr/bin/java";
+ }
+ } catch (IOException ioe) {
+ log.warning("Failed to check Mac OS canonical VM path.", ioe);
+ }
+ }
+
+ return vmpath;
+ }
+
+ /**
+ * Upgrades Getdown by moving an installation managed copy of the Getdown jar file over the
+ * non-managed copy (which would be used to run Getdown itself).
+ *
+ * <p> If the upgrade fails for a variety of reasons, warnings are logged but no other actions
+ * are taken. There's not much else one can do other than try again next time around.
+ */
+ public static void upgradeGetdown (File oldgd, File curgd, File newgd)
+ {
+ // we assume getdown's jar file size changes with every upgrade, this is not guaranteed,
+ // but in reality it will, and it allows us to avoid pointlessly upgrading getdown every
+ // time the client is updated which is unnecessarily flirting with danger
+ if (!newgd.exists() || newgd.length() == curgd.length()) {
+ return;
+ }
+
+ log.info("Updating Getdown with " + newgd + "...");
+
+ // clear out any old getdown
+ if (oldgd.exists()) {
+ FileUtil.deleteHarder(oldgd);
+ }
+
+ // now try updating using renames
+ if (!curgd.exists() || curgd.renameTo(oldgd)) {
+ if (newgd.renameTo(curgd)) {
+ FileUtil.deleteHarder(oldgd); // yay!
+ try {
+ // copy the moved file back to getdown-dop-new.jar so that we don't end up
+ // downloading another copy next time
+ FileUtil.copy(curgd, newgd);
+ } catch (IOException e) {
+ log.warning("Error copying updated Getdown back: " + e);
+ }
+ return;
+ }
+
+ log.warning("Unable to renameTo(" + oldgd + ").");
+ // try to unfuck ourselves
+ if (!oldgd.renameTo(curgd)) {
+ log.warning("Oh God, why dost thee scorn me so.");
+ }
+ }
+
+ // that didn't work, let's try copying it
+ log.info("Attempting to upgrade by copying over " + curgd + "...");
+ try {
+ FileUtil.copy(newgd, curgd);
+ } catch (IOException ioe) {
+ log.warning("Mayday! Brute force copy method also failed.", ioe);
+ }
+ }
+
+ /**
+ * Returns true if, on this operating system, we have to stick around and read the stderr from
+ * our children processes to prevent them from filling their output buffers and hanging.
+ */
+ public static boolean mustMonitorChildren ()
+ {
+ String osname = System.getProperty("os.name", "").toLowerCase(Locale.ROOT);
+ return (osname.indexOf("windows 98") != -1 || osname.indexOf("windows me") != -1);
+ }
+
+ /**
+ * Returns true if we're running in a JVM that identifies its operating system as Windows.
+ */
+ public static final boolean isWindows () { return _isWindows; }
+
+ /**
+ * Returns true if we're running in a JVM that identifies its operating system as MacOS.
+ */
+ public static final boolean isMacOS () { return _isMacOS; }
+
+ /**
+ * Returns true if we're running in a JVM that identifies its operating system as Linux.
+ */
+ public static final boolean isLinux () { return _isLinux; }
+
+ /**
+ * Checks whether a Java Virtual Machine can be located in the supplied path.
+ */
+ protected static String checkJVMPath (String vmhome, boolean windebug)
+ {
+ String vmbase = vmhome + File.separator + "bin" + File.separator;
+ String vmpath = vmbase + "java";
+ if (new File(vmpath).exists()) {
+ return vmpath;
+ }
+
+ if (!windebug) {
+ vmpath = vmbase + "javaw.exe";
+ if (new File(vmpath).exists()) {
+ return vmpath;
+ }
+ }
+
+ vmpath = vmbase + "java.exe";
+ if (new File(vmpath).exists()) {
+ return vmpath;
+ }
+
+ return null;
+ }
+
+ /** Flag indicating that we're on Windows; initialized when this class is first loaded. */
+ protected static boolean _isWindows;
+ /** Flag indicating that we're on MacOS; initialized when this class is first loaded. */
+ protected static boolean _isMacOS;
+ /** Flag indicating that we're on Linux; initialized when this class is first loaded. */
+ protected static boolean _isLinux;
+
+ static {
+ try {
+ String osname = System.getProperty("os.name");
+ osname = (osname == null) ? "" : osname;
+ _isWindows = (osname.indexOf("Windows") != -1);
+ _isMacOS = (osname.indexOf("Mac OS") != -1 ||
+ osname.indexOf("MacOS") != -1);
+ _isLinux = (osname.indexOf("Linux") != -1);
+ } catch (Exception e) {
+ // can't grab system properties; we'll just pretend we're not on any of these OSes
+ }
+ }
+}
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