Improve path checks, handling symlinks when targets don't exist

pyproject.toml

@@ -4,7 +4,8 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pycpio"
-version = "1.4.1"
+version = "1.4.2"
+
 authors = [
   { name="Desultory", email="[email protected]" },
 ]

src/pycpio/cpio/data.py

@@ -58,7 +58,7 @@ def from_dir(path: Path, parent=None, relative=False, *args, **kwargs):
         return data
 
     @staticmethod
-    def from_path(path: Path, relative=False, *args, **kwargs):
+    def from_path(path: Path, relative=False, resolve_symlink=False, *args, **kwargs):
         """
         Create a CPIOData object from a path.
         If a name is provided, it will be used instead of the resolved path.
@@ -101,15 +101,14 @@ def from_path(path: Path, relative=False, *args, **kwargs):
         if not kwargs.pop("absolute", False):
             kwargs["name"] = kwargs["name"].lstrip("/")
 
-        # Get the inode number from the path
-        kwargs["ino"] = path.stat().st_ino
-
         # Get the mode type from the supplied path
         kwargs["mode"] = mode_bytes_from_path(path)
 
-        # Use the path's uid and gid if not provided
-        kwargs["uid"] = kwargs.pop("uid", path.stat().st_uid)
-        kwargs["gid"] = kwargs.pop("gid", path.stat().st_gid)
+        for stat in ("ino", "uid", "gid"):
+            try:  # Try to get the stat from the kwargs, otherwise, get it from the path
+                kwargs[stat] = kwargs.pop(stat, getattr(path.stat(), f"st_{stat}"))
+            except FileNotFoundError:
+                kwargs[stat] = 0  # If the symlink target doesn't exist, set the stat to 0
 
         header = CPIOHeader(*args, **kwargs)
         data = CPIOData.get_subtype(b"", header, *args, **kwargs)

src/pycpio/cpio/symlink.py

@@ -27,7 +27,10 @@ def __init__(self, *args, **kwargs):
             if kwargs.get("recursive", False):
                 symlink_path = symlink_path.lstrip("/")
             self.data = symlink_path.encode("ascii")
-            self.header.mtime = path.stat().st_mtime
+            try:
+                self.header.mtime = path.stat().st_mtime
+            except FileNotFoundError:
+                self.header.mtime = 0  # default to 0 if file not found
         elif self.data is None:
             raise ValueError("path must be specified for symlinks")
 

tests/test_cpio.py

@@ -140,6 +140,10 @@ def test_newc_from_kwargs(self):
             for attr, value in header_data.items():
                 self.assertEqual(getattr(test_header, attr), value)
 
+    def test_invalid_symlink_target(self):
+        test_symlink = Path(self.workdir.name) / 'test_symlink'
+        test_symlink.symlink_to('/a/totally/nonexistent/path')
+        self.cpio.append_recursive(self.workdir.name)
 
 if __name__ == '__main__':
     main()