def get_file_diff(commit1, commit2, folder):
    ls = run_cmd(['git', 'diff', '--name-status', commit1, commit2])
    lines = ls.split("\n")

    ret = []
    idx = 0
    while idx < len(lines):
        line = lines[idx]
        if len(line.strip()) > 0:
            sl = line.split("\t")
            act = sl[0]
            file = sl[-1]

            if act == "A" or act == "M":
                if file.startswith(folder):
                    ret.append(file)

        idx += 1

    return ret