Feature Request: Include file ownership in files analyzer

[Lukas]

Background

I'm working on user permissions for the kaniko builder (GoogleContainerTools/kaniko#2106) and wanted to check if the ownership of a file is set correctly by using --chown flag on COPY statements.

Using container-diff there is currently no way to get the file ownership information.

Would probably go into this function in the files analyzer:

container-diff/pkg/util/fs_utils.go

Lines 120 to 132 in bea7ad9

 func CreateDirectoryEntries(root string, entryNames []string) (entries []DirectoryEntry) { 
 	for _, name := range entryNames { 
 		entryPath := filepath.Join(root, name) 
 		size := GetSize(entryPath) 
  
 		entry := DirectoryEntry{ 
 			Name: name, 
 			Size: size, 
 		} 
 		entries = append(entries, entry) 
 	} 
 	return entries 
 } 

[Lukas]

After some investigation this seems to be difficult to achieve:

Currently, the tar archive gets unpacked without reconstructing the ownership.
Reconstructing is kind of difficult permissions wise, because to reconstruct, container-diff would need to be as run root

[Dhehowns]

What is actually compared beyond the file size? I can’t find that anywhere and the reports doesnt say.