github@openai/codex 里，模型生成的 diff 是什么格式，udiff 吗？

Explaining custom patch format

The tool isn't rendering text content, but we can still cite the search result sources. The answer should clarify that the model uses a custom "apply_patch" format, not udiff. I'll provide an example snippet, but remember citations can't go inside the code block—I'll note them in the text. Hunks in "Update File" are similar to unified diff with @@ headers and +/- lines. I'll verify this.

Providing patch format example

Here's a minimal example of the custom "apply_patch" format:

text
*** Begin Patch
*** Add File: hello.txt
+Hello
*** Update File: src/app.py
@@
-print("Hi")
+print("Hello")
*** Delete File: old.txt
*** End Patch

Remember, no citations should be inside the code block—place them after the paragraph. It's a simplified, file-oriented format that’s easy to parse, safe to apply, and uses unified diff style in its hunks. I'll also link to the relevant documentation later.

Providing concise technical answer

Codex uses a custom "apply_patch" format instead of standard unified diff (udiff). The format has a clear structure, with headers like "Begin Patch" and "End Patch". Hunks are similar to those in udiff, using '@@', '+' and '-' lines, with "Move to:" for renames. References: Codex Docs (website), open issue (website), gpt-oss doc (website), aider doc (website).

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Explaining apply_patch tool

The apply_patch tool is invoked within the CLI, meaning no external binary is used. It can either be structured as a tool call or intercepted by the CLI as a pseudo-shell command with the --codex-run-as-apply-patch flag. The applier handles file operations like adding, updating, deleting, and moving files. There are safety checks with approval modes, requesting confirmation unless set to auto. I’ll reference issues, like 2235 and 2030, for specific examples.

Describing patch process details

The apply_patch tool includes approval workflows, and security guardrails are mentioned in issue 802 for user approvals. In Windows, workspace boundaries are checked, with prompts appearing as needed. The Rust crate uses "similar::TextDiff" for diffing hunks, helping with near-matches and fuzzy searches. I'll cite relevant module usage and documentation for clarity.

Explaining patch tool functions

The tool uses "similar::TextDiff" and a "seek_sequence" helper to locate hunk positions, as referenced in the lib.rs file. Although we couldn't view the content, a snippet on the GitHub page confirms the usage. I'll cite the source with careful language, ensuring not to go beyond what’s supported. The tool aborts and prints an error if a hunk fails to apply, as seen in issue 2295.

Explaining patch tool summary and invocation range

The tool may print a brief Git-style summary via the "print_summary" function, as listed in the agcodex-apply-patch documentation. It's safer to say, "the Rust applier can print a Git-style summary" while referencing docs.rs. Also, the CLI detects apply_patch in Heredoc forms, as noted in issue 2235.

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Clarifying apply_patch availability

The official implementation isn’t available as a separate library or CLI tool; it’s embedded within the Codex monorepo. You can reuse it by either adding it as a Git submodule or vendoring the code, all under the Apache-2.0 license. Citations should include the instructions document and relevant issue tracking this information.

Providing code path and license details

For non-Rust programs that want to reuse the tool, there are two options:

1. Call the Codex binary with the --codex-run-as-apply-patch flag. Set config to auto-approve and ensure "include_apply_patch_tool = true".

2. Use the community-maintained packages like "codex-apply-patch" (PyPI) or on GitHub. Be mindful of CRLF line-ending issues where applicable.

Also, check the relevant spec document for implementation details.

Answer summary

This is

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