From 1f6cac14e057bb889298f92173a70a8d53c231c3 Mon Sep 17 00:00:00 2001
From: Karolina Surma <33810531+befeleme@users.noreply.github.com>
Date: Mon, 19 Aug 2024 23:40:33 +0200
Subject: [PATCH] PEP 639: Make the policy around globs tighter (#3913)

---
 peps/pep-0639.rst | 29 ++++++++++++++++++++---------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/peps/pep-0639.rst b/peps/pep-0639.rst
index 433045b64..9a3851e03 100644
--- a/peps/pep-0639.rst
+++ b/peps/pep-0639.rst
@@ -521,21 +521,32 @@ containing licenses and other legal notices to be distributed with the package.
 It corresponds to the ``License-File`` fields in the Core Metadata.
 
 Its value is an array of strings which MUST contain valid glob patterns,
-as specified below.
-The glob patterns MAY contain special glob characters: ``*``, ``?``, ``**``
-and character ranges: ``[]``, and tools MUST support them.
-Path delimiters MUST be the forward slash character (``/``),
-and parent directory indicators (``..``) MUST NOT be used.
+as specified below:
+
+- Alphanumeric characters, underscores (``_``), hyphens (``-``) and dots (``.``)
+  MUST be matched verbatim.
+
+- Special glob characters: ``*``, ``?``, ``**`` and character ranges: ``[]``
+  containing only the verbatim matched characters MUST be supported.
+  Within ``[...]``, the hyphen indicates a range (e.g. ``a-z``).
+  Hyphens at the start or end are matched literally.
+
+- Path delimiters MUST be the forward slash character (``/``).
+  Patterns are relative to the directory containing ``pyproject.toml``,
+  therefore the leading slash character MUST NOT be used.
+
+- Parent directory indicators (``..``) MUST NOT be used.
+
+Any characters or character sequences not covered by this specification are
+invalid. Projects MUST NOT use such values.
+Tools consuming this field MAY reject invalid values with an error.
+
 Tools MUST assume that license file content is valid UTF-8 encoded text,
 and SHOULD validate this and raise an error if it is not.
 
 Literal paths (e.g. ``LICENSE``) are treated as valid globs which means they
 can also be defined.
 
-To achieve better portability, the filenames to match should only contain
-the alphanumeric characters, underscores (``_``), hyphens (``-``)
-and dots (``.``).
-
 Build tools:
 
 - MUST treat each value as a glob pattern, and MUST raise an error if the