[PATCH v2] doc/setversions.py: add --get-latest-branch argument

Add a --get-latest-branch argument that can be used to show the latest
branch from the parsed releases.json file. This will be used by the
Autobuilder to know what the version of the default bitbake docs page
should be.

Signed-off-by: Antonin Godard <[email protected]>
---
https://lore.kernel.org/r/20260429-fix-docs-bitbake-latest-branch-v1-1-25cce6bf4f26@bootlin.com

Note: Companion patch on yocto-autobuilder-helper:
---
Changes in v2:
- Fixup help message as suggested by Quentin
- Link to v1: https://patch.msgid.link/[email protected]

To: [email protected]
Cc: Thomas Petazzoni <[email protected]>
Cc: [email protected]
---
 doc/setversions.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/doc/setversions.py b/doc/setversions.py
index f1aea0a4225..dc0bb11e75e 100755
--- a/doc/setversions.py
+++ b/doc/setversions.py
@@ -13,6 +13,7 @@
 # SPDX-License-Identifier: MIT
 #
 
+import argparse
 import itertools
 import json
 import os
@@ -23,6 +24,15 @@ import textwrap
 
 from urllib.request import urlopen, URLError
 
+parser = argparse.ArgumentParser(
+    description="Parse https://dashboard.yoctoproject.org/releases.json to get current releases information"
+)
+parser.add_argument("--get-latest-branch",
+                    help="Print current latest branch and exit",
+                    action="store_true",
+                    default=False)
+args = parser.parse_args()
+
 # NOTE: the following variables contain default values in case we are not able to fetch
 # the releases.json file from https://dashboard.yoctoproject.org/releases.json
 DEVBRANCH = "2.18"
@@ -85,6 +95,10 @@ if RELEASES_FROM_JSON:
     # current releases is also an LTS
     ACTIVERELEASES = list(dict.fromkeys([current_branch] + LTSSERIES))
 
+if args.get_latest_branch:
+    print(ACTIVERELEASES[0])
+    sys.exit(0)
+
 print(f"ACTIVERELEASES calculated to be {ACTIVERELEASES}", file=sys.stderr)
 print(f"DEVBRANCH calculated to be {DEVBRANCH}", file=sys.stderr)
 print(f"LTSSERIES calculated to be {LTSSERIES}", file=sys.stderr)

---
base-commit: b79667b6599494a0ed209d48bf8bbb7e8921d926
change-id: 20260428-doc-get-latest-branch-d17e0de248a3