GTiff: fix to not delete DIMAP XML files when cleaning overviews on a…

… DIMAP2 GeoTIFF file with external overviews

autotest/gcore/tiff_read.py

@@ -5327,3 +5327,25 @@ def test_tiff_read_unrecognized_color_interpretation():
     ds = gdal.Open("data/gtiff/unknown_colorinterp.tif")
     assert ds.GetRasterBand(1).GetColorInterpretation() == gdal.GCI_Undefined
     assert ds.GetRasterBand(1).GetMetadataItem("COLOR_INTERPRETATION") == "XXXX"
+
+
+###############################################################################
+# Check that cleaning overviews on a DIMAP2 GeoTIFF file with external overviews
+# does not cause the DIMAP XML file to be cleaned
+
+
+def test_tiff_read_ovr_dimap_pleiades(tmp_path):
+
+    shutil.copytree("../gdrivers/data/dimap2/bundle", tmp_path / "bundle")
+    filename = str(tmp_path / "bundle" / "IMG_foo_R1C1.TIF")
+    ds = gdal.Open(filename)
+    ds.BuildOverviews("NEAR", [2])
+    ds = None
+    ds = gdal.Open(filename + ".ovr")
+    assert ds.GetFileList() == [filename + ".ovr"]
+    ds = None
+    ds = gdal.Open(filename)
+    ds.BuildOverviews("", [])
+    ds = None
+    # Check that cleaning overviews did not suppress the DIMAP XML file
+    assert os.path.exists(tmp_path / "bundle" / "DIM_foo.XML")

frmts/gtiff/gtiffdataset_read.cpp

@@ -6653,6 +6653,18 @@ void GTiffDataset::LoadMetadata()
         return;
     m_bIMDRPCMetadataLoaded = true;
 
+    if (EQUAL(CPLGetExtension(GetDescription()), "ovr"))
+    {
+        // Do not attempt to retrieve metadata files on .tif.ovr files.
+        // For example the Pleiades metadata reader might wrongly associate a
+        // DIM_xxx.XML file that was meant to be associated with the main
+        // TIFF file. The consequence of that wrong association is that if
+        // one cleans overviews, then the Delete() method would then delete
+        // that DIM_xxx.XML file since it would be reported in the GetFileList()
+        // of the overview dataset.
+        return;
+    }
+
     GDALMDReaderManager mdreadermanager;
     GDALMDReaderBase *mdreader = mdreadermanager.GetReader(
         m_pszFilename, oOvManager.GetSiblingFiles(), MDR_ANY);