Added runtime arg to fix settings permissions, and on-first-init

chameleon-server/src/main/java/com/chameleonvision/util/ShellExec.java

@@ -19,6 +19,43 @@ public class ShellExec {
         this.readError = readError;
     }
 
+    /**
+     * Execute a bash command. We can handle complex bash commands including
+     * multiple executions (; | && ||), quotes, expansions ($), escapes (\), e.g.:
+     *     "cd /abc/def; mv ghi 'older ghi '$(whoami)"
+     * @param command
+     * @return true if bash got started, but your command may have failed.
+     */
+    public int executeBashCommand(String command) throws IOException {
+        boolean wait = true;
+        boolean success = false;
+        Runtime r = Runtime.getRuntime();
+        // Use bash -c so we can handle things like multi commands separated by ; and
+        // things like quotes, $, |, and \. My tests show that command comes as
+        // one argument to bash, so we do not need to quote it to make it one thing.
+        // Also, exec may object if it does not have an executable file as the first thing,
+        // so having bash here makes it happy provided bash is installed and in path.
+        String[] commands = {"bash", "-c", command};
+
+        Process process = r.exec(commands);
+
+        // Consume streams, older jvm's had a memory leak if streams were not read,
+        // some other jvm+OS combinations may block unless streams are consumed.
+        errorGobbler  = new StreamGobbler(process.getErrorStream(), readError);
+        outputGobbler = new StreamGobbler(process.getInputStream(), readOutput);
+        errorGobbler.start();
+        outputGobbler.start();
+
+        exitCode = 0;
+        if (wait) {
+            try {
+                process.waitFor();
+                exitCode = process.exitValue();
+            } catch (InterruptedException ignored) { }
+        }
+        return exitCode;
+    }
+
     /**
      * Execute a command in current folder, and wait for process to end
      * @param command   command ("c:/some/folder/script.bat" or "some/folder/script.sh")