From e271d3d10c821b0dcb6bc71ceffd64f20b401f34 Mon Sep 17 00:00:00 2001
From: Gary Kramlich <grim@reaperworld.com>
Date: Tue, 24 Dec 2024 00:05:50 -0600
Subject: [PATCH] Add support for .hg_archival to detect_vcs

This allows vcs_tag() to work on a mercurial archived tarball so programs can
display the revision at runtime.
---
 mesonbuild/utils/universal.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/mesonbuild/utils/universal.py b/mesonbuild/utils/universal.py
index f26a9a3de8c6..c0afaebb4d66 100644
--- a/mesonbuild/utils/universal.py
+++ b/mesonbuild/utils/universal.py
@@ -772,6 +772,14 @@ def detect_vcs(source_dir: T.Union[str, Path]) -> T.Optional[T.Dict[str, str]]:
             'rev_regex': '(.*)',
             'dep': '.hg/dirstate'
         },
+        {
+            'name': 'mercurial',
+            'cmd': 'cat',
+            'repo_dir': '.',
+            'get_rev': 'cat .hg_archival.txt',
+            'rev_regex': 'node: (.*)\n',
+            'dep': '.hg_archival.txt'
+        },
         {
             'name': 'subversion',
             'cmd': 'svn',