1 files changed, 34 insertions, 0 deletions
diff --git a/src/main/java/io/github/jshipit/SysUtils.java b/src/main/java/io/github/jshipit/SysUtils.java
new file mode 100644
index 0000000..3ea48fb
--- /dev/null
+++ b/src/main/java/io/github/jshipit/SysUtils.java
@@ -0,0 +1,34 @@
+package io.github.jshipit;
+
+import com.sun.jna.Library;
+import com.sun.jna.Native;
+import com.sun.jna.Platform;
+
+public class SysUtils {
+
+    interface CLibrary extends Library {
+        public int chmod(String path, int mode);
+    }
+
+    public void chmod(String path, int mode) {
+        CLibrary libc = (CLibrary) Native.load("c", CLibrary.class);
+        libc.chmod(path, mode);
+    }
+    public void overlayMount(String[] lower, String upper, String target, String work) {
+        if (Platform.isLinux()) {
+
+            ProcessBuilder pb = new ProcessBuilder("unshare", "--user", "--map-root-user", "--mount", "mount", "-t", "overlay", "overlay", "-o", "lowerdir="+String.join(":", lower)+",upperdir="+upper+",workdir="+work, target);
+            pb.inheritIO();
+            try {
+                Process p = pb.start();
+                p.waitFor();
+            } catch (Exception e) {
+                throw new RuntimeException(e);
+            }
+
+        } else {
+            System.out.println("Platform not supported.");
+            System.out.println("mount -t overlay overlay -o lowerdir="+String.join(":", lower)+",upperdir="+upper+",workdir="+work+" "+target);
+        }
+    }
+}