feat: File ownership methods added (#56)

src/main/java/io/homecentr/testcontainers/containers/GenericContainerEx.java

@@ -8,6 +8,7 @@
 import org.testcontainers.containers.output.OutputFrame;
 import org.testcontainers.images.builder.ImageFromDockerfile;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.net.HttpURLConnection;
 import java.net.URL;
@@ -66,6 +67,30 @@ public Integer getProcessGid(String processName) throws IOException, Interrupted
         return Integer.parseInt(output);
     }
 
+    public Integer getFileOwnerUid(String filePath) throws IOException, InterruptedException {
+        ExecResult result = executeShellCommand("stat -c '%u' " + filePath);
+
+        if(result.getExitCode() != 0) {
+            throw new FileNotFoundException(filePath);
+        }
+
+        String output = result.getStdout().trim();
+
+        return Integer.parseInt(output);
+    }
+
+    public Integer getFileOwningGid(String filePath) throws IOException, InterruptedException {
+        ExecResult result = executeShellCommand("stat -c '%g' " + filePath);
+
+        if(result.getExitCode() != 0) {
+            throw new FileNotFoundException(filePath);
+        }
+
+        String output = result.getStdout().trim();
+
+        return Integer.parseInt(output);
+    }
+
     public ExecResult executeShellCommand(String command) throws IOException, InterruptedException {
         return this.execInContainer(
                 getShellExecutable(),

src/test/java/io/homecentr/testcontainers/containers/GenericContainerEx_getFileOwnerUidShould.java

@@ -0,0 +1,49 @@
+package io.homecentr.testcontainers.containers;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.testcontainers.containers.output.Slf4jLogConsumer;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertThrows;
+
+public class GenericContainerEx_getFileOwnerUidShould {
+    private static final Logger logger = LoggerFactory.getLogger(GenericContainerEx_getProcessGidShould.class);
+
+    private GenericContainerEx _container;
+
+    @Before
+    public void before() throws IOException, InterruptedException {
+        _container = new GenericContainerEx<>("centos").withCommand("bash", "-c", "sleep 100s");
+        _container.start();
+        _container.followOutput(new Slf4jLogConsumer(logger));
+
+        _container.executeShellCommand("useradd -u 1100 test");
+    }
+
+    @After
+    public void after() {
+        _container.close();
+    }
+
+    @Test
+    public void returnFileOwnerUid() throws IOException, InterruptedException {
+        _container.executeShellCommand("echo Hello > /tmp/out.txt");
+        _container.executeShellCommand("chown 1000 /tmp/out.txt");
+
+        Integer ownerUid = _container.getFileOwnerUid("/tmp/out.txt");
+
+        assertEquals(1000, (long)ownerUid);
+    }
+
+    @Test
+    public void throwFileNotFoundException_GivenNonExistingPath() {
+        assertThrows(FileNotFoundException.class, () -> _container.getFileOwnerUid("/tmp/out.txt"));
+    }
+}

src/test/java/io/homecentr/testcontainers/containers/GenericContainerEx_getFileOwningGidShould.java

@@ -0,0 +1,49 @@
+package io.homecentr.testcontainers.containers;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.testcontainers.containers.output.Slf4jLogConsumer;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertThrows;
+
+public class GenericContainerEx_getFileOwningGidShould {
+    private static final Logger logger = LoggerFactory.getLogger(GenericContainerEx_getProcessGidShould.class);
+
+    private GenericContainerEx _container;
+
+    @Before
+    public void before() throws IOException, InterruptedException {
+        _container = new GenericContainerEx<>("centos").withCommand("bash", "-c", "sleep 100s");
+        _container.start();
+        _container.followOutput(new Slf4jLogConsumer(logger));
+
+        _container.executeShellCommand("groupadd -g 1100 test");
+    }
+
+    @After
+    public void after() {
+        _container.close();
+    }
+
+    @Test
+    public void returnFileOwnerUid() throws IOException, InterruptedException {
+        _container.executeShellCommand("echo Hello > /tmp/out.txt");
+        _container.executeShellCommand("chgrp 1000 /tmp/out.txt");
+
+        Integer ownerUid = _container.getFileOwningGid("/tmp/out.txt");
+
+        assertEquals(1000, (long)ownerUid);
+    }
+
+    @Test
+    public void throwFileNotFoundException_GivenNonExistingPath() {
+        assertThrows(FileNotFoundException.class, () -> _container.getFileOwningGid("/tmp/out.txt"));
+    }
+}