[Plugin] Check if a path exists inside a container in add_dir_listing()

Currently, add_dir_listing() checks if a path exists outside of a
container, and when we call the command for a container, it fails to
collect any listing. This patch adds a new function
container_path_exists() that checks for the specified path in
add_dir_listing() inside the container.

Resolves: #3805

Signed-off-by: Jose Castillo <[email protected]>
Signed-off-by: Pavel Moravec <[email protected]>

sos/report/plugins/__init__.py

@@ -2078,7 +2078,11 @@ def add_dir_listing(self, paths, tree=False, recursive=False, chroot=True,
         if isinstance(paths, str):
             paths = [paths]
 
-        paths = [p for p in paths if self.path_exists(p)]
+        if container:
+            paths = [p for p in paths if
+                     self.container_path_exists(p, container=container)]
+        else:
+            paths = [p for p in paths if self.path_exists(p)]
 
         if not tree:
             options = f"alZ{'R' if recursive else ''}"
@@ -3410,6 +3414,22 @@ def setup_verify(self):
         if verify_cmd:
             self.add_cmd_output(verify_cmd)
 
+    def container_path_exists(self, path, container):
+        """Check if a path exists inside a container before
+        collecting a dir listing
+
+        :param path:    The canonical path for a specific file/directory
+                        in a container
+        :type path:     ``str``
+
+        :param container: The container where to check for the path
+        :type container: ``str``
+
+        :returns:       True if the path exists in the container, else False
+        :rtype:         ``bool``
+        """
+        return self.exec_cmd(f"test -e {path}", container=container)
+
     def path_exists(self, path):
         """Helper to call the sos.utilities wrapper that allows the
         corresponding `os` call to account for sysroot