[3.12] gh-151365: Temporarily downgrade Git to prevent fatal error (GH-155495) (GH-155532) (GH-155533) (GH-155535) (#155537)

hugovk <[email protected]> Tue, 11 Aug 2026 03:02:00 -0400 (EDT)
Newsgroups gmane.comp.python.cvs
Message-ID <[email protected]>
https://github.com/python/cpython/commit/af5a05689933607decf2610ea9547722ba85fbc3
commit: af5a05689933607decf2610ea9547722ba85fbc3
branch: 3.12
author: Miss Islington (bot) <[email protected]>
committer: hugovk <[email protected]>
date: 2026-08-11T07:01:41Z
summary:

[3.12] gh-151365: Temporarily downgrade Git to prevent fatal error (GH-155495) (GH-155532) (GH-155533) (GH-155535) (#155537)

Co-authored-by: Hugo van Kemenade <[email protected]>

files:
M .github/workflows/reusable-context.yml
M .github/workflows/reusable-docs.yml

diff --git a/.github/workflows/reusable-context.yml b/.github/workflows/reusable-context.yml
index 7561f49e8715b29..24997f7f9fe135b 100644
--- a/.github/workflows/reusable-context.yml
+++ b/.github/workflows/reusable-context.yml
@@ -66,6 +66,15 @@ 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=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
       if: github.event_name == 'pull_request'
diff --git a/.github/workflows/reusable-docs.yml b/.github/workflows/reusable-docs.yml
index 89d5f18c5573905..529158ba4c360c4 100644
--- a/.github/workflows/reusable-docs.yml
+++ b/.github/workflows/reusable-docs.yml
@@ -33,6 +33,14 @@ 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=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'
       if: github.event_name == 'pull_request'

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