linux-kernel - [PATCH v2 2/3] tools/docs: python_version: allow check for alternatives and bail out

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Message-ID: <6c2155e62b71e5e10fd4b17ecc33fb1187f7dca6.1756916565.git.mchehab+huawei@kernel.org>
Date: Wed,  3 Sep 2025 18:24:15 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: Jonathan Corbet <corbet@....net>,
	Linux Doc Mailing List <linux-doc@...r.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
	Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/3] tools/docs: python_version: allow check for alternatives and bail out

The caller script may not want an automatic execution of the new
version. Add two parameters to allow showing alternatives and to
bail out if version is incompatible.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
 tools/docs/lib/python_version.py | 43 ++++++++++++++++++++++++++------
 1 file changed, 35 insertions(+), 8 deletions(-)

diff --git a/tools/docs/lib/python_version.py b/tools/docs/lib/python_version.py
index 660bfe7d23fa..a9fda2470a26 100644
--- a/tools/docs/lib/python_version.py
+++ b/tools/docs/lib/python_version.py
@@ -85,10 +85,12 @@ class PythonVersion:
         may need to update it one day, hopefully on a distant future.
         """
         patterns = [
-            "python3.[0-9]",
             "python3.[0-9][0-9]",
+            "python3.[0-9]",
         ]
 
+        python_cmd = []
+
         # Seek for a python binary newer than min_version
         for path in os.getenv("PATH", "").split(":"):
             for pattern in patterns:
@@ -96,12 +98,13 @@ class PythonVersion:
                     if os.path.isfile(cmd) and os.access(cmd, os.X_OK):
                         version = PythonVersion.get_python_version(cmd)
                         if version >= min_version:
-                            return cmd
+                            python_cmd.append((version, cmd))
 
-        return None
+        return sorted(python_cmd, reverse=True)
 
     @staticmethod
-    def check_python(min_version):
+    def check_python(min_version, show_alternatives=False, bail_out=False,
+                     success_on_error=False):
         """
         Check if the current python binary satisfies our minimal requirement
         for Sphinx build. If not, re-run with a newer version if found.
@@ -113,18 +116,42 @@ class PythonVersion:
 
         python_ver = PythonVersion.ver_str(cur_ver)
 
-        new_python_cmd = PythonVersion.find_python(min_version)
-        if not new_python_cmd:
+        available_versions = PythonVersion.find_python(min_version)
+        if not available_versions:
             print(f"ERROR: Python version {python_ver} is not spported anymore\n")
             print("       Can't find a new version. This script may fail")
             return
 
-        # Restart script using the newer version
         script_path = os.path.abspath(sys.argv[0])
-        args = [new_python_cmd, script_path] + sys.argv[1:]
+
+        # Check possible alternatives
+        if available_versions:
+            new_python_cmd = available_versions[0][1]
+        else:
+            new_python_cmd = None
+
+        if show_alternatives:
+            print("You could run, instead:")
+            for _, cmd in available_versions:
+                args = [cmd, script_path] + sys.argv[1:]
+
+                cmd_str = " ".join(args)
+                print(f"  {cmd_str}")
+            print()
+
+        if bail_out:
+            msg = f"Python {python_ver} not supported. Bailing out"
+            if success_on_error:
+                print(msg, file=sys.stderr)
+                sys.exit(0)
+            else:
+                sys.exit(msg)
 
         print(f"Python {python_ver} not supported. Changing to {new_python_cmd}")
 
+        # Restart script using the newer version
+        args = [new_python_cmd, script_path] + sys.argv[1:]
+
         try:
             os.execv(new_python_cmd, args)
         except OSError as e:
-- 
2.51.0