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GeezerVison is showing github.com — gh-151365: Temporarily downgrade Git to prevent fatal error by hugovk · Pull Request #155495 · python/cpython

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@hugovk

@hugovk hugovk commented Aug 10, 2026 •
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Downgrading takes 7 seconds.

Upgrading via build from source (+cache) or Homebrew are likely to take longer.

  • Issue: GitHub Actions: Docs/Docs CI fails randomly with "fatal: shallow file has changed since we read it" error (git 2.54.0 regression) #151365

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@hugovk
Temporarily downgrade Git to prevent fatal error
8b75361
@bedevere-app bedevere-app Bot mentioned this pull request Aug 10, 2026
GitHub Actions: Docs/Docs CI fails randomly with "fatal: shallow file has changed since we read it" error (git 2.54.0 regression) #151365
Closed
@hugovk hugovk added the skip news label Aug 10, 2026
@hugovk
hugovk marked this pull request as ready for review August 10, 2026 16:18
@hugovk
hugovk requested review from AA-Turner, JacobCoffee, ezio-melotti, itamaro and webknjaz as code owners August 10, 2026 16:18
@bedevere-app bedevere-app Bot added the awaiting core review label Aug 10, 2026
@webknjaz

webknjaz commented Aug 10, 2026

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Is it possible to explicitly declare the version limit in the command, plz?
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vstinner
vstinner approved these changes Aug 10, 2026
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LGTM.

It works as expected. For example, I see "git version 2.43.0" in the "Downgrade Git" step of Docs/Docs CI job.

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Comment thread .github/workflows/reusable-check-html-ids.yml Outdated
# 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

@vstinner vstinner Aug 10, 2026

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I didn't know this /noble-updates syntax. I understand that it's a way to request the git version of Ubuntu 24.04.

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@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting core review labels Aug 10, 2026
@vstinner vstinner mentioned this pull request Aug 10, 2026
gh-151365: Retry git fetch in CI workflows #155490
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@hugovk

hugovk commented Aug 10, 2026

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Is it possible to explicitly declare the version limit in the command, plz?

Something like this?

sudo apt-get install -y --allow-downgrades 'git=1:2.43.*' 'git-man=1:2.43.*'
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@webknjaz

webknjaz commented Aug 10, 2026 •
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@hugovk yep, something along those lines. I was hoping for a <= broken_version.
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@hugovk
Pin to 2.43.*
0fb2213
webknjaz
webknjaz approved these changes Aug 10, 2026
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@webknjaz webknjaz added the 3.15 bugs and security fixes label Aug 10, 2026
StanFromIreland
StanFromIreland approved these changes Aug 10, 2026
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serhiy-storchaka
serhiy-storchaka approved these changes Aug 10, 2026
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@vstinner

vstinner commented Aug 10, 2026

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I suppose that this change should be backported to stable branches (3.13 to 3.15).
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@webknjaz

webknjaz commented Aug 10, 2026 •
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@vstinner I've already labeled it for 3.15, but one of the workflow files doesn't exist in 3.14 so automatic backporting will fail farther back. Once it's ported into 3.15, somebody needs to look into picking it back into older branches manually.
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@vstinner vstinner added the needs backport to 3.15 bugs and security fixes label Aug 10, 2026
@vstinner

vstinner commented Aug 10, 2026

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I've already labeled it for 3.15

The "needs backport to 3.15" label is better for that: it backports automatically the change to 3.15.
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@hugovk
hugovk merged commit 6d2b551 into python:main Aug 11, 2026
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@hugovk
hugovk deleted the 3.16-downgrade-git branch August 11, 2026 04:53
@miss-islington-app

miss-islington-app Bot commented Aug 11, 2026

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Thanks @hugovk for the PR 🌮🎉.. I'm working now to backport this PR to: 3.15.
🐍🍒⛏🤖
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@bedevere-app bedevere-app Bot removed the awaiting merge label Aug 11, 2026
@bedevere-app

bedevere-app Bot commented Aug 11, 2026

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GH-155532 is a backport of this pull request to the 3.15 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.15 bugs and security fixes label Aug 11, 2026
hugovk added a commit that referenced this pull request Aug 11, 2026
@miss-islington @hugovk
[3.15] gh-151365: Temporarily downgrade Git to prevent fatal error (G…
74da6fb 
…H-155495) (#155532)

Co-authored-by: Hugo van Kemenade <[email protected]>
hugovk added a commit that referenced this pull request Aug 11, 2026
@hugovk @miss-islington
[3.14] gh-151365: Temporarily downgrade Git to prevent fatal error (G…
f420f7c 
…H-155495) (GH-155532) (#155533)

Co-authored-by: Miss Islington (bot) <[email protected]>
hugovk added a commit that referenced this pull request Aug 11, 2026
@miss-islington @hugovk
[3.13] gh-151365: Temporarily downgrade Git to prevent fatal error (G…
bec0cbc 
…H-155495) (GH-155532) (GH-155533) (#155535)

Co-authored-by: Hugo van Kemenade <[email protected]>
hugovk added a commit that referenced this pull request Aug 11, 2026
@miss-islington @hugovk
[3.12] gh-151365: Temporarily downgrade Git to prevent fatal error (G…
af5a056 
…H-155495) (GH-155532) (GH-155533) (GH-155535) (#155537)

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

webknjaz commented Aug 11, 2026

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@vstinner oops, for some reason I thought I did that but confused the two labels 🤦‍♂️ sry
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mbeijen pushed a commit to mbeijen/cpython that referenced this pull request Aug 14, 2026
@hugovk @mbeijen
pythongh-151365: Temporarily downgrade Git to prevent fatal error (py…
e511781 
…thon#155495)
hugovk pushed a commit that referenced this pull request Aug 29, 2026
@StanFromIreland
gh-151365: Revert temporary Git downgrade (#156584)
3e9efe5 
Revert "gh-151365: Temporarily downgrade Git to prevent fatal error (#155495)"

This reverts commit 6d2b551.
@miss-islington miss-islington mentioned this pull request Aug 29, 2026
[3.15] gh-151365: Revert temporary Git downgrade (GH-156584) #156588
Merged
@StanFromIreland StanFromIreland mentioned this pull request Aug 29, 2026
[3.14] gh-151365: Revert temporary Git downgrade (GH-156584) #156599
Merged
hugovk pushed a commit that referenced this pull request Aug 29, 2026
@StanFromIreland
[3.14] gh-151365: Revert temporary Git downgrade (GH-156584) (#156599)
da06c4c 
Revert "gh-151365: Temporarily downgrade Git to prevent fatal error (GH-155495)"

This reverts commit 6d2b551.
(cherry picked from commit 3e9efe5)
This was referenced Aug 29, 2026
[3.13] gh-151365: Revert temporary Git downgrade (GH-156584) (GH-156599) #156600
Merged
[3.12] gh-151365: Revert temporary Git downgrade (GH-156584) (GH-156599) #156601
Merged
hugovk pushed a commit that referenced this pull request Aug 30, 2026
@miss-islington @StanFromIreland
[3.13] gh-151365: Revert temporary Git downgrade (GH-156584) (GH-156599…
4ee4734 
…) (#156600)

[3.14] gh-151365: Revert temporary Git downgrade (GH-156584) (GH-156599)

Revert "gh-151365: Temporarily downgrade Git to prevent fatal error (GH-155495)"
(cherry picked from commit da06c4c)


This reverts commit 6d2b551.
(cherry picked from commit 3e9efe5)

Co-authored-by: Stan Ulbrych <[email protected]>
hugovk pushed a commit that referenced this pull request Aug 30, 2026
@miss-islington @StanFromIreland
[3.12] gh-151365: Revert temporary Git downgrade (GH-156584) (GH-156599…
e114415 
…) (#156601)

[3.14] gh-151365: Revert temporary Git downgrade (GH-156584) (GH-156599)

Revert "gh-151365: Temporarily downgrade Git to prevent fatal error (GH-155495)"
(cherry picked from commit da06c4c)


This reverts commit 6d2b551.
(cherry picked from commit 3e9efe5)

Co-authored-by: Stan Ulbrych <[email protected]>
clin1234 pushed a commit to clin1234/cpython that referenced this pull request Sep 12, 2026
@StanFromIreland @clin1234
pythongh-151365: Revert temporary Git downgrade (python#156584)
e4b0fe1 
Revert "pythongh-151365: Temporarily downgrade Git to prevent fatal error (python#155495)"

This reverts commit 6d2b551.
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Reviewers

@vstinner vstinner vstinner approved these changes
@webknjaz webknjaz webknjaz approved these changes
@serhiy-storchaka serhiy-storchaka serhiy-storchaka approved these changes
@StanFromIreland StanFromIreland StanFromIreland approved these changes
@ezio-melotti ezio-melotti Awaiting requested review from ezio-melotti ezio-melotti is a code owner
@AA-Turner AA-Turner Awaiting requested review from AA-Turner AA-Turner is a code owner
@itamaro itamaro Awaiting requested review from itamaro itamaro is a code owner
@JacobCoffee JacobCoffee Awaiting requested review from JacobCoffee JacobCoffee is a code owner

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@hugovk @webknjaz @vstinner @serhiy-storchaka @StanFromIreland
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