From 8b7536149171ae1e075745d2a86d4d8cd26dedd3 Mon Sep 17 00:00:00 2001
From: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Date: Mon, 10 Aug 2026 19:15:06 +0300
Subject: [PATCH 1/2] Temporarily downgrade Git to prevent fatal error

---
 .github/workflows/reusable-check-html-ids.yml | 7 +++++++
 .github/workflows/reusable-context.yml        | 9 +++++++++
 .github/workflows/reusable-docs.yml           | 8 ++++++++
 3 files changed, 24 insertions(+)

diff --git a/.github/workflows/reusable-check-html-ids.yml b/.github/workflows/reusable-check-html-ids.yml
index 41ba1288be1ecf4..0a9f6701dc3c8e1 100644
--- a/.github/workflows/reusable-check-html-ids.yml
+++ b/.github/workflows/reusable-check-html-ids.yml
@@ -20,6 +20,13 @@ jobs:
         with:
           persist-credentials: false
           ref: ${{ github.event.pull_request.head.sha }}
+      - name: 'Downgrade Git'
+        # Temporarily downgrade to 2.43 until 2.55 is in the runner image,
+        # to avoid "fatal: shallow file has changed since we read it" bug.
+        # See https://github.com/python/cpython/issues/151365.
+        run: |
+          sudo apt-get install -y --allow-downgrades git/noble-updates git-man/noble-updates
+          git --version
       - name: 'Find merge base'
         id: merge-base
         run: |
diff --git a/.github/workflows/reusable-context.yml b/.github/workflows/reusable-context.yml
index c998cbff181dd12..4dfcef79b77c11d 100644
--- a/.github/workflows/reusable-context.yml
+++ b/.github/workflows/reusable-context.yml
@@ -90,6 +90,15 @@ jobs:
             || ''
           }}
 
+    - name: 'Downgrade Git'
+      # Temporarily downgrade to 2.43 until 2.55 is in the runner image,
+      # to avoid "fatal: shallow file has changed since we read it" bug.
+      # See https://github.com/python/cpython/issues/151365.
+      if: github.event_name == 'pull_request'
+      run: |
+        sudo apt-get install -y --allow-downgrades git/noble-updates git-man/noble-updates
+        git --version
+
     # Adapted from https://github.com/actions/checkout/issues/520#issuecomment-1167205721
     - name: Fetch commits to get branch diff
       if: github.event_name == 'pull_request'
diff --git a/.github/workflows/reusable-docs.yml b/.github/workflows/reusable-docs.yml
index 199e0fd8d181f0b..b89237b5add323e 100644
--- a/.github/workflows/reusable-docs.yml
+++ b/.github/workflows/reusable-docs.yml
@@ -47,6 +47,14 @@ jobs:
             && github.event.pull_request.head.sha
             || ''
           }}
+    - name: 'Downgrade Git'
+      # Temporarily downgrade to 2.43 until 2.55 is in the runner image,
+      # to avoid "fatal: shallow file has changed since we read it" bug.
+      # See https://github.com/python/cpython/issues/151365.
+      if: github.event_name == 'pull_request'
+      run: |
+        sudo apt-get install -y --allow-downgrades git/noble-updates git-man/noble-updates
+        git --version
     # Adapted from https://github.com/actions/checkout/issues/520#issuecomment-1167205721
     - name: 'Fetch commits to get branch diff'
       if: github.event_name == 'pull_request'

From 0fb22138fe3cb2aeb5685aec4a0d1ba406beaacb Mon Sep 17 00:00:00 2001
From: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Date: Mon, 10 Aug 2026 19:41:37 +0300
Subject: [PATCH 2/2] Pin to 2.43.*

---
 .github/workflows/reusable-check-html-ids.yml | 2 +-
 .github/workflows/reusable-context.yml        | 2 +-
 .github/workflows/reusable-docs.yml           | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/reusable-check-html-ids.yml b/.github/workflows/reusable-check-html-ids.yml
index 0a9f6701dc3c8e1..bdebacc9eed06bc 100644
--- a/.github/workflows/reusable-check-html-ids.yml
+++ b/.github/workflows/reusable-check-html-ids.yml
@@ -25,7 +25,7 @@ jobs:
         # to avoid "fatal: shallow file has changed since we read it" bug.
         # See https://github.com/python/cpython/issues/151365.
         run: |
-          sudo apt-get install -y --allow-downgrades git/noble-updates git-man/noble-updates
+          sudo apt-get install -y --allow-downgrades 'git=1:2.43.*' 'git-man=1:2.43.*'
           git --version
       - name: 'Find merge base'
         id: merge-base
diff --git a/.github/workflows/reusable-context.yml b/.github/workflows/reusable-context.yml
index 4dfcef79b77c11d..f307326bae41209 100644
--- a/.github/workflows/reusable-context.yml
+++ b/.github/workflows/reusable-context.yml
@@ -96,7 +96,7 @@ jobs:
       # See https://github.com/python/cpython/issues/151365.
       if: github.event_name == 'pull_request'
       run: |
-        sudo apt-get install -y --allow-downgrades git/noble-updates git-man/noble-updates
+        sudo apt-get install -y --allow-downgrades 'git=1:2.43.*' 'git-man=1:2.43.*'
         git --version
 
     # Adapted from https://github.com/actions/checkout/issues/520#issuecomment-1167205721
diff --git a/.github/workflows/reusable-docs.yml b/.github/workflows/reusable-docs.yml
index b89237b5add323e..6b1a9076c8251b0 100644
--- a/.github/workflows/reusable-docs.yml
+++ b/.github/workflows/reusable-docs.yml
@@ -53,7 +53,7 @@ jobs:
       # See https://github.com/python/cpython/issues/151365.
       if: github.event_name == 'pull_request'
       run: |
-        sudo apt-get install -y --allow-downgrades git/noble-updates git-man/noble-updates
+        sudo apt-get install -y --allow-downgrades 'git=1:2.43.*' 'git-man=1:2.43.*'
         git --version
     # Adapted from https://github.com/actions/checkout/issues/520#issuecomment-1167205721
     - name: 'Fetch commits to get branch diff'