overlay,mount: convert lowerdir to absolute path for overlay mounts of path

When mounting paths as overlay mounts we end up passing source as is to
lowerdir options, resolve all relative paths in such cases for overlay
mounts.

Closes: https://github.com/containers/podman/issues/14797

Signed-off-by: Aditya R <arajan@redhat.com>

pkg/specgen/volumes.go

@@ -139,7 +139,13 @@ func GenVolumeMounts(volumeFlag []string) (map[string]spec.Mount, map[string]*Na
 				// This is a overlay volume
 				newOverlayVol := new(OverlayVolume)
 				newOverlayVol.Destination = dest
-				newOverlayVol.Source = src
+				// convert src to absolute path so we don't end up passing
+				// relative values as lowerdir for overlay mounts
+				source, err := filepath.Abs(src)
+				if err != nil {
+					return nil, nil, nil, errors.Wrapf(err, "failed while resolving absolute path for source %v for overlay mount", src)
+				}
+				newOverlayVol.Source = source
 				newOverlayVol.Options = options
 
 				if _, ok := overlayVolumes[newOverlayVol.Destination]; ok {

test/e2e/run_volume_test.go

@@ -678,6 +678,15 @@ VOLUME /test/`, ALPINE)
 		session.WaitWithDefaultTimeout()
 		Expect(session).Should(Exit(0))
 
+		// Test overlay mount when lowerdir is relative path.
+		f, err = os.Create("hello")
+		Expect(err).To(BeNil(), "os.Create")
+		f.Close()
+		session = podmanTest.Podman([]string{"run", "--rm", "-v", ".:/app:O", ALPINE, "ls", "/app"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.OutputToString()).To(ContainSubstring("hello"))
+		Expect(session).Should(Exit(0))
+
 		// Make sure modifications in container do not show up on host
 		session = podmanTest.Podman([]string{"run", "--rm", "-v", volumeFlag, ALPINE, "touch", "/run/test/container"})
 		session.WaitWithDefaultTimeout()