Updating Homebrew: error: cannot rebase: You have unstaged changes. error: No stash entries found.

[muescha]

Output of brew config

brew config
HOMEBREW_VERSION: 4.4.4-41-g451c3a8
ORIGIN: https://github.com/Homebrew/brew
HEAD: 451c3a8735eb9b3050e40802a771eddf7c23e568
Last commit: 23 hours ago
Core tap JSON: 07 Nov 14:21 UTC
Core cask tap JSON: 07 Nov 14:21 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_MAKE_JOBS: 10
HOMEBREW_SORBET_RUNTIME: set
Homebrew Ruby: 3.3.6 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/3.3.6/bin/ruby
CPU: 10-core 64-bit arm_firestorm_icestorm
Clang: 16.0.0 build 1600
Git: 2.39.5 => /Applications/Xcode.app/Contents/Developer/usr/bin/git
Curl: 8.6.0 => /usr/bin/curl
macOS: 14.5-arm64
CLT: 15.3.0.0.1.1708646388
Xcode: 16.1
Rosetta 2: false

Output of brew doctor

brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: Some installed casks are deprecated or disabled.
You should find replacements for the following casks:
  cloudytabs
  gutenprint
  microsoft-teams@classic
  shortcuts

Warning: You have the following deprecated, official taps tapped:
  Homebrew/homebrew-cask-versions
  Homebrew/homebrew-cask-fonts
Untap them with `brew untap`.

Warning: You have unlinked kegs in your Cellar.
Leaving kegs unlinked can lead to build-trouble and cause formulae that depend on
those kegs to fail to run properly once built. Run `brew link` on these:
  docker

Warning: Some taps are not on the default git origin branch and may not receive
updates. If this is a surprise to you, check out the default branch with:
  git -C $(brew --repo xpipe-io/tap) checkout master

Description of issue

I run brew cu which runs at first brew update.

I get the following error:

==> Updating Homebrew...
error: cannot rebase: You have unstaged changes.
error:
No stash entries found.

Full log:

$ brew cu
==> Options
Include auto-update (-a): false
Include latest (-f): false
==> Updating Homebrew
==> Updating Homebrew...
error: cannot rebase: You have unstaged changes.
error:
No stash entries found.
==> Downloading https://ghcr.io/v2/homebrew/portable-ruby/portable-ruby/blobs/sha256:303bed4c7fc431a685db3c3c151d873740114adbdccd23762ea2d1e39ea78f47
#################################################################################################### 100.0%
==> Pouring portable-ruby-3.3.6.arm64_big_sur.bottle.tar.gz
==> Updated Homebrew from 4.4.3 (37dc93131c) to 4.4.4 (451c3a8735).
Updated 7 taps (oven-sh/bun, homebrew/bundle, homebrew/services, peripheryapp/periphery, xpipe-io/tap, homebrew/core and homebrew/cask).
==> New Formulae
decasify
dipc
[...]
znote

You have 13 outdated formulae and 9 outdated casks installed.
You can upgrade them with brew upgrade
or list them with brew outdated.

The 4.4.4 changelog can be found at:
  https://github.com/Homebrew/brew/releases/tag/4.4.4

Warning: Cask homebrew/cask-versions/1password7 was renamed to 1password@7.
Warning: Cask homebrew/cask-versions/microsoft-teams-classic was renamed to microsoft-teams@classic.
Warning: Cask homebrew/cask-versions/virtualbox-beta was renamed to virtualbox@beta.
Warning: Cask homebrew/cask-versions/whatsapp-beta was renamed to whatsapp@beta.
[... ]

trying to find the git status:

$ cd /opt/homebrew/Library/Homebrew/

$ git status
On branch master
Your branch is up to date with 'origin/master'.

nothing to commit, working tree clean

unfortunately I can not reproduce the bug:

$ brew update
==> Updating Homebrew...
Already up-to-date.

[SMillerDev]

You can try brew update-reset to eradicate all non-committed changes to your install.

[muescha]

I like to analyze the root cause of these errors. Is there a way to view the current status of unstaged changes and understand why "No stash entries found" appears?

[p-linnane]

git status to see which files have been changed and git diff to see the diffs.

[muescha]

git diff doesn't show any output, and git status says everything is up to date. :/

$ pwd
/opt/homebrew/Library/Homebrew
$ git diff
$ git status
On branch master
Your branch is up to date with 'origin/master'.

nothing to commit, working tree clean

Am I in the wrong folder? Or was the root cause of the error overwritten during the update process? I noticed the log above shows:

==> Updated Homebrew from 4.4.3 (37dc93131c) to 4.4.4 (451c3a8735).

[SMillerDev]

Yeah, that's too far. You can do cd $(brew --prefix) for the git root.

[muescha]

Thanks for pointing to the git root for brew :)
I think the error is gone because when I run the brew update again there is no error.

$ brew --prefix
/opt/homebrew

$ cd $(brew --prefix)

$ pwd
/opt/homebrew

$ git diff

$ git status
On branch master
Your branch is up to date with 'origin/master'.

nothing to commit, working tree clean

$ ll
Permissions   Size User    Date Modified    Name
drwxr-xr-x       - muescha 2024-10-19 15:41 .devcontainer/
drwxr-xr-x       - muescha 2024-11-07 17:38 .git/
drwxr-xr-x       - muescha 2024-07-21 05:14 .github/
drwxr-xr-x       - muescha 2023-08-28 22:46 .idea/
drwxr-xr-x       - muescha 2022-01-04 20:09 .sublime/
drwxr-xr-x       - muescha 2024-10-19 15:41 .vscode/
drwxrwxr-x       - muescha 2024-11-07 15:56 bin/
drwxrwxr-x       - muescha 2024-11-07 17:37 Caskroom/
drwxrwxr-x       - muescha 2024-10-28 17:53 Cellar/
drwxr-xr-x       - muescha 2024-10-19 15:41 completions/
drwxr-xr-x       - muescha 2024-10-28 13:13 docs/
drwxrwxr-x       - muescha 2024-10-28 17:18 etc/
drwxrwxr-x       - muescha 2024-10-22 14:30 Frameworks/
drwxrwxr-x       - muescha 2024-10-28 17:13 include/
drwxrwxr-x       - muescha 2024-10-28 17:14 lib/
drwxr-xr-x       - muescha 2024-11-07 15:03 Library/
drwxr-xr-x       - muescha 2024-11-07 15:03 manpages/
drwxrwxr-x       - muescha 2024-10-28 17:53 opt/
drwxr-xr-x       - muescha 2024-10-19 15:41 package/
drwxrwxr-x       - muescha 2024-10-22 14:31 sbin/
drwxr-xr-x       - muescha 2024-10-22 14:31 share/
drwxrwxr-x       - muescha 2024-06-23 12:20 var/
.rw-r--r--      51 muescha 2022-01-04 20:09 .dockerignore
.rw-r--r--@ 10,244 muescha 2023-08-06 23:05 .DS_Store
.rw-r--r--     380 muescha 2024-03-14 14:16 .editorconfig
.rw-r--r--   6,122 muescha 2024-10-19 15:41 .gitignore
.rw-r--r--   1,342 muescha 2022-01-04 20:09 .shellcheckrc
.rw-r--r--      89 muescha 2024-05-23 11:35 .vale.ini
.rw-r--r--   5,543 muescha 2023-08-06 17:39 add_reporter_for_changed_files.patch
.rw-r--r--     207 muescha 2022-01-04 20:09 CHANGELOG.md
.rw-r--r--     829 muescha 2023-07-29 23:07 CONTRIBUTING.md
.rw-r--r--   4,092 muescha 2024-10-19 15:41 Dockerfile
.rw-r--r--   1,334 muescha 2022-01-04 20:09 LICENSE.txt
.rw-r--r--   8,858 muescha 2024-10-28 13:13 README.md

I think there is some mess in the files, but just now the error is gone and I not be able to reproduce it.