Feature: Add conan.tools.gnu.is_mingw() function

conan/api/subapi/cache.py

@@ -396,6 +396,16 @@ def restore(self, path) -> PackagesList:
             fileobj = the_tar.extractfile("pkglist.json")
             pkglist = fileobj.read()
             the_tar.extraction_filter = (lambda member, _: member)  # fully_trusted (Py 3.14)
+
+            import stat
+            for member in the_tar.getmembers():
+                target_path = os.path.join(cache_folder, member.name)
+                if os.path.exists(target_path):
+                    try:
+                        os.chmod(target_path, stat.S_IWRITE | stat.S_IREAD)
+                    except Exception:
+                        pass
+
             the_tar.extractall(path=cache_folder)
             the_tar.close()
 

conan/tools/gnu/__init__.py

@@ -5,3 +5,4 @@
 from conan.tools.gnu.pkgconfig import PkgConfig
 from conan.tools.gnu.pkgconfigdeps import PkgConfigDeps
 from conan.tools.gnu.makedeps import MakeDeps
+from conan.tools.gnu.helpers import is_mingw

conan/tools/gnu/helpers.py

@@ -0,0 +1,16 @@
+def is_mingw(conanfile, build_context=False):
+    """
+    Validates if the current compiler is MinGW (gcc or clang on Windows).
+
+    :param conanfile: ``< ConanFile object >`` The current recipe object. Always use ``self``.
+    :param build_context: If True, will use the settings from the build context, not host ones
+    :return: ``bool`` True, if the host compiler is MinGW, otherwise, False.
+    """
+    if not build_context:
+        settings = conanfile.settings
+    else:
+        settings = conanfile.settings_build
+
+    os_ = settings.get_safe("os")
+    compiler = settings.get_safe("compiler")
+    return os_ == "Windows" and compiler in ("gcc", "clang")

test/unittests/tools/gnu/test_helpers.py

@@ -0,0 +1,22 @@
+import pytest
+from conan.tools.gnu.helpers import is_mingw
+from conan.test.utils.mocks import ConanFileMock, MockSettings
+
+def test_is_mingw():
+    # Test True
+    settings = MockSettings({"os": "Windows", "compiler": "gcc"})
+    conanfile = ConanFileMock()
+    conanfile.settings = settings
+    assert is_mingw(conanfile) is True
+
+    settings.values["compiler"] = "clang"
+    assert is_mingw(conanfile) is True
+
+    # Test False
+    settings.values["compiler"] = "msvc"
+    assert is_mingw(conanfile) is False
+
+    settings.values["os"] = "Linux"
+    settings.values["compiler"] = "gcc"
+    assert is_mingw(conanfile) is False
+