Diff objects not showing file changes

[stacey-gammon]

I am trying to use this library to get the file changes by looking at diff.diff, but it's not working, while running what I think is the same command via a subprocess, works.

Code:

    # Using this library
    uncommitted_diff = repo.index.diff(None, paths=paths)
    committed_diff = repo.index.diff(base[0], paths=paths)
    for diff in [*uncommitted_diff, *committed_diff]:
        print(f"diff: {diff.diff}")

 
   # Using subprocess and running git directly
    process1 = subprocess.exec(["git", "diff", paths], capture_output=True)
    process2 = subprocess.exec(["git", "diff", base[0].hexsha], capture_output=True)

    print("using subprocess:")
    print(process1.stdout.decode("utf-8"))subprocess
    print(process2.stdout.decode("utf-8"))

Output (with some omiting of info) is:

diff: 
using subprocess:

diff --git a******.py
index ******
--- a******.py
+++ b******.py
@@ -1,9 +1,11 @@
from pathlib import Path
-from typing import Any
+from typing import Any, Optional, Tuple, Union

.....

Any ideas what is going on here and why the two results are different?

[Byron]

You could probably debug this by setting the GIT_PYTHON_TRACE environment variable.

As I always have been confused by this API myself I wouldn't be able to tell what's wrong just by looking at it either, and it's definitely easy to get it wrong or to get unintended results.

I will convert this into a discussion in case we get down to the source of the problem, or we create an issue from there once it's clear it's a bug.