org.argeo.cms/src/org/argeo/cms/util/OS.java

   1 package org.argeo.cms.util;
   2
   3 import java.io.File;
   4 import java.nio.file.Files;
   5 import java.nio.file.Path;
   6 import java.nio.file.Paths;
   7
   8 /**
   9  * Wrapper around system properties and portable Java APIS, for when OS specific
  10  * informations are needed.
  11  */
  12 public class OS {
  13         public final static OS LOCAL = new OS();
  14
  15         private final String arch, name, version;
  16
  17         /** The OS of the running JVM */
  18         protected OS() {
  19                 arch = System.getProperty("os.arch");
  20                 name = System.getProperty("os.name");
  21                 version = System.getProperty("os.version");
  22         }
  23
  24         public String getArch() {
  25                 return arch;
  26         }
  27
  28         public String getName() {
  29                 return name;
  30         }
  31
  32         public String getVersion() {
  33                 return version;
  34         }
  35
  36         public boolean isMSWindows() {
  37                 // only MS Windows would use such an horrendous separator...
  38                 return File.separatorChar == '\\';
  39         }
  40
  41         public String[] getDefaultShellCommand() {
  42                 if (!isMSWindows())
  43                         return new String[] { "/bin/bash", "-l", "-i" };
  44                 else
  45                         return new String[] { "cmd.exe", "/C" };
  46         }
  47
  48 //      public static long getJvmPid() {
  49 //              return ProcessHandle.current().pid();
  50 ////            String pidAndHost = ManagementFactory.getRuntimeMXBean().getName();
  51 ////            return Integer.parseInt(pidAndHost.substring(0, pidAndHost.indexOf('@')));
  52 //      }
  53
  54         /**
  55          * Get the runtime directory. It will be the environment variable
  56          * XDG_RUNTIME_DIR if it is set, or /run if the user is 'root', or
  57          * ~/.cache/argeo if not.
  58          */
  59         public static Path getRunDir() {
  60                 Path runDir;
  61                 String xdgRunDir = System.getenv("XDG_RUNTIME_DIR");
  62                 if (xdgRunDir != null) {
  63                         // TODO support multiple names
  64                         runDir = Paths.get(xdgRunDir);
  65                 } else {
  66                         String username = System.getProperty("user.name");
  67                         if (username.equals("root")) {
  68                                 runDir = Paths.get("/run");
  69                         } else {
  70                                 Path homeDir = Paths.get(System.getProperty("user.home"));
  71                                 if (!Files.isWritable(homeDir)) {
  72                                         // typically, dameon's home (/usr/sbin) is not writable
  73                                         runDir = Paths.get("/tmp/" + username + "/run");
  74                                 } else {
  75                                         runDir = homeDir.resolve(".cache/argeo");
  76                                 }
  77                         }
  78                 }
  79                 return runDir;
  80         }
  81 }