[3.10] RTD Previews: Get correct base branch for backports (GH-150690)

(cherry picked from commit 082ac30)

Co-authored-by: Stan Ulbrych <stan@python.org>

Author: StanFromIreland

.readthedocs.yml

@@ -1,14 +1,60 @@
-# This is a dummy config file so that readthedocs.org doesn't fail on security branches.
-# Note that this won't result in docs actually getting built;
-# clicking on the docs preview link on a PR will result in a 404.
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+# Project page: https://readthedocs.org/projects/cpython-previews/
+
 version: 2
-formats: []
+
 sphinx:
-  configuration: Doc/conf.py
+   configuration: Doc/conf.py
+
 build:
-  os: "ubuntu-22.04"
+  os: ubuntu-24.04
   tools:
-    python: "3.11"
+    python: "3"
+  apt_packages:
+    - jq
+
   jobs:
-    post_checkout:
-    - exit 183
+    post_system_dependencies:
+      # https://docs.readthedocs.com/platform/stable/guides/build/skip-build.html#skip-builds-based-on-conditions
+      #
+      # Cancel building pull requests when there are no changes in the Doc
+      # directory or RTD configuration, or if we can't cleanly merge the base
+      # branch.
+      - |
+        set -eEux;
+        if [ "$READTHEDOCS_VERSION_TYPE" = "external" ];
+        then
+          base_branch=$(wget -qO- "https://api.github.com/repos/python/cpython/pulls/$READTHEDOCS_VERSION" | jq -er ".base.ref");
+          git fetch --depth=50 origin $base_branch:origin-$base_branch;
+          for attempt in $(seq 10);
+          do
+            if ! git merge-base HEAD origin-$base_branch;
+            then
+              git fetch --deepen=50 origin $base_branch;
+            else
+              break;
+            fi;
+          done;
+          if ! git -c "user.name=rtd" -c "user.email=no-reply@readthedocs.org" merge --no-stat --no-edit origin-$base_branch;
+          then
+            echo "Unsuccessful merge with '$base_branch' branch, skipping the build";
+            exit 183;
+          fi;
+          if git diff --exit-code --stat origin-$base_branch -- Doc/ .readthedocs.yml;
+          then
+            echo "No changes to Doc/ - skipping the build.";
+            exit 183;
+          fi;
+        fi;
+    create_environment:
+      - echo "Skipping default environment creation"
+    install:
+      - asdf plugin add uv
+      - asdf install uv latest
+      - asdf global uv latest
+    build:
+      html:
+        - make -C Doc venv html
+        - mkdir -p "$READTHEDOCS_OUTPUT"
+        - mv Doc/build/html "$READTHEDOCS_OUTPUT/"