Global Git hooks run on brew commands.

[KiyoIchikawa]

Output of brew config

HOMEBREW_VERSION: 4.2.3-54-gdca9ff8
ORIGIN: https://github.com/Homebrew/brew
HEAD: dca9ff865aed9ab4fe7dfd02d4b3fcf31ce6c20a
Last commit: 9 hours ago
Core tap JSON: 11 Jan 21:55 UTC
Core cask tap JSON: 11 Jan 21:55 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_MAKE_JOBS: 8
Homebrew Ruby: 3.1.4 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/3.1.4/bin/ruby
CPU: octa-core 64-bit arm_firestorm_icestorm
Clang: 15.0.0 build 1500
Git: 2.39.3 => /Library/Developer/CommandLineTools/usr/bin/git
Curl: 8.4.0 => /usr/bin/curl
macOS: 14.2.1-arm64
CLT: 15.0.0.0.1.1694021235
Xcode: 15.2
Rosetta 2: false

Output of 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: A newer Command Line Tools release is available.
Update them from Software Update in System Settings.

If that doesn't show you any updates, run:
  sudo rm -rf /Library/Developer/CommandLineTools
  sudo xcode-select --install

Alternatively, manually download them from:
  https://developer.apple.com/download/all/.
You should download the Command Line Tools for Xcode 15.1.

Description of issue

I have a company managed M1 MacBook Pro and found that brew commands will fire "global" git hooks if you have core.hookspath= set to something in your Git config.

The particular hook I had issues with was post-checkout that only runs git clean -fXd. The results of running brew update was this:

post-checkout hook

!! ----------------------------------------------------- !!
   Cleaning out ignored files left from previous branch.
!! ----------------------------------------------------- !!
Removing Caskroom/
Removing Cellar/
Removing Frameworks/
Skipping repository Library/Taps/hashicorp/homebrew-tap
Skipping repository Library/Taps/homebrew/homebrew-services
Skipping repository Library/Taps/atlassian/homebrew-tap
Removing bin/.keepme
Removing bin/2to3
Removing bin/2to3-3.10
Removing bin/2to3-3.11
Removing bin/2to3-3.9
Removing bin/adig
Removing bin/ahost
Removing bin/asn1Coding
Removing bin/asn1Decoding
Removing bin/asn1Parser
Removing bin/atlas-clean
Removing bin/atlas-compile
Removing bin/atlas-create-bamboo-plugin
Removing bin/atlas-create-bamboo-plugin-module
Removing bin/atlas-create-bitbucket-plugin
Removing bin/atlas-create-bitbucket-plugin-module
Removing bin/atlas-create-confluence-plugin
Removing bin/atlas-create-confluence-plugin-module
Removing bin/atlas-create-crowd-plugin
Removing bin/atlas-create-crowd-plugin-module
Removing bin/atlas-create-fecru-plugin
Removing bin/atlas-create-fecru-plugin-module
Removing bin/atlas-create-home-zip
Removing bin/atlas-create-jira-plugin
Removing bin/atlas-create-jira-plugin-module
Removing bin/atlas-create-jira4-plugin
Removing bin/atlas-create-jira5-plugin
Removing bin/atlas-create-plugin
Removing bin/atlas-create-refapp-plugin
Removing bin/atlas-create-refapp-plugin-module
Removing bin/atlas-create-stash-plugin
Removing bin/atlas-create-stash-plugin-module
Removing bin/atlas-debug
Removing bin/atlas-help
Removing bin/atlas-install-plugin
Removing bin/atlas-integration-test
Removing bin/atlas-mvn
Removing bin/atlas-package
Removing bin/atlas-release
Removing bin/atlas-release-rollback
Removing bin/atlas-remote-test
Removing bin/atlas-ruin
Removing bin/atlas-run
Removing bin/atlas-run-standalone
Removing bin/atlas-unit-test
Removing bin/atlas-update
Removing bin/atlas-version
Removing bin/autoconf
Removing bin/autoheader
Removing bin/autom4te
Removing bin/autopoint
Removing bin/autoreconf
Removing bin/autoscan
Removing bin/autoupdate
Removing bin/az
Removing bin/black
Removing bin/blackd
Removing bin/brotli
Removing bin/c_rehash
Removing bin/cjpeg
Removing bin/cloc
Removing bin/consul
Removing bin/convert-dtsv0
Removing bin/cstool
Removing bin/danetool
Removing bin/dirmngr
Removing bin/dirmngr-client
Removing bin/djpeg
Removing bin/dpipe
Removing bin/dtc
Removing bin/dtdiff
Removing bin/dumpsexp
Removing bin/elf2dmp
Removing bin/envsubst
Removing bin/event_rpcgen.py
Removing bin/fdtdump
Removing bin/fdtget
Removing bin/fdtoverlay
Removing bin/fdtput
Removing bin/gdbm_dump
Removing bin/gdbm_load
Removing bin/gdbmtool
Removing bin/gdbus
Removing bin/gdbus-codegen
Removing bin/gettext
Removing bin/gettext.sh
Removing bin/gettextize
Removing bin/gio
Removing bin/gio-querymodules
Removing bin/git
Removing bin/git-cvsserver
Removing bin/git-receive-pack
Removing bin/git-shell
Removing bin/git-upload-archive
Removing bin/git-upload-pack
Removing bin/github.com/
Removing bin/glib-compile-resources
Removing bin/glib-compile-schemas
Removing bin/glib-genmarshal
Removing bin/glib-gettextize
Removing bin/glib-mkenums
Removing bin/gnutls-certtool
Removing bin/gnutls-cli
Removing bin/gnutls-cli-debug
Removing bin/gnutls-serv
Removing bin/gobject-query
Removing bin/gpg
Removing bin/gpg-agent
Removing bin/gpg-card
Removing bin/gpg-connect-agent
Removing bin/gpg-error
Removing bin/gpg-error-config
Removing bin/gpg-wks-client
Removing bin/gpg-wks-server
Removing bin/gpgconf
Removing bin/gpgparsemail
Removing bin/gpgrt-config
Removing bin/gpgscm
Removing bin/gpgsm
Removing bin/gpgsplit
Removing bin/gpgtar
Removing bin/gpgv
Removing bin/gresource
Removing bin/gsed
Removing bin/gsettings
Removing bin/gtester
Removing bin/gtester-report
Removing bin/hmac256
Removing bin/idle3
Removing bin/idle3.10
Removing bin/idle3.11
Removing bin/idle3.9
Removing bin/idn2
Removing bin/ifnames
Removing bin/jpegtran
Removing bin/jq
Removing bin/kbxutil
Removing bin/ksba-config
Removing bin/libassuan-config
Removing bin/libgcrypt-config
Removing bin/libpng-config
Removing bin/libpng16-config
Removing bin/lz4
Removing bin/lz4c
Removing bin/lz4cat
Removing bin/lzcat
Removing bin/lzcmp
Removing bin/lzdiff
Removing bin/lzegrep
Removing bin/lzfgrep
Removing bin/lzgrep
Removing bin/lzless
Removing bin/lzma
Removing bin/lzmadec
Removing bin/lzmainfo
Removing bin/lzmore
Removing bin/mpicalc
Removing bin/msgattrib
Removing bin/msgcat
Removing bin/msgcmp
Removing bin/msgcomm
Removing bin/msgconv
Removing bin/msgen
Removing bin/msgexec
Removing bin/msgfilter
Removing bin/msgfmt
Removing bin/msggrep
Removing bin/msginit
Removing bin/msgmerge
Removing bin/msgunfmt
Removing bin/msguniq
Removing bin/nettle-hash
Removing bin/nettle-lfib-stream
Removing bin/nettle-pbkdf2
Removing bin/ngettext
Removing bin/node
Removing bin/nomad
Removing bin/npm
Removing bin/npth-config
Removing bin/npx
Removing bin/ocsptool
Removing bin/onig-config
Removing bin/openssl
Removing bin/p11-kit
Removing bin/p11tool
Removing bin/packer
Removing bin/pcre2-config
Removing bin/pcre2grep
Removing bin/pcre2test
Removing bin/pinentry
Removing bin/pinentry-curses
Removing bin/pinentry-tty
Removing bin/pip3
Removing bin/pip3.10
Removing bin/pip3.11
Removing bin/pip3.9
Removing bin/pkcs1-conv
Removing bin/pkg-config
Removing bin/png-fix-itxt
Removing bin/pngfix
Removing bin/podman
Removing bin/podman-mac-helper
Removing bin/podman-remote
Removing bin/psktool
Removing bin/pydoc3
Removing bin/pydoc3.10
Removing bin/pydoc3.11
Removing bin/pydoc3.9
Removing bin/python3
Removing bin/python3-config
Removing bin/python3.10
Removing bin/python3.10-config
Removing bin/python3.11
Removing bin/python3.11-config
Removing bin/python3.9
Removing bin/python3.9-config
Removing bin/pzstd
Removing bin/qemu-edid
Removing bin/qemu-img
Removing bin/qemu-io
Removing bin/qemu-nbd
Removing bin/qemu-storage-daemon
Removing bin/qemu-system-aarch64
Removing bin/qemu-system-alpha
Removing bin/qemu-system-arm
Removing bin/qemu-system-avr
Removing bin/qemu-system-cris
Removing bin/qemu-system-hppa
Removing bin/qemu-system-i386
Removing bin/qemu-system-loongarch64
Removing bin/qemu-system-m68k
Removing bin/qemu-system-microblaze
Removing bin/qemu-system-microblazeel
Removing bin/qemu-system-mips
Removing bin/qemu-system-mips64
Removing bin/qemu-system-mips64el
Removing bin/qemu-system-mipsel
Removing bin/qemu-system-nios2
Removing bin/qemu-system-or1k
Removing bin/qemu-system-ppc
Removing bin/qemu-system-ppc64
Removing bin/qemu-system-riscv32
Removing bin/qemu-system-riscv64
Removing bin/qemu-system-rx
Removing bin/qemu-system-s390x
Removing bin/qemu-system-sh4
Removing bin/qemu-system-sh4eb
Removing bin/qemu-system-sparc
Removing bin/qemu-system-sparc64
Removing bin/qemu-system-tricore
Removing bin/qemu-system-x86_64
Removing bin/qemu-system-xtensa
Removing bin/qemu-system-xtensaeb
Removing bin/rdjpgcom
Removing bin/recode-sr-latin
Removing bin/scalar
Removing bin/sexp-conv
Removing bin/terraform
Removing bin/tjbench
Removing bin/trust
Removing bin/unixcmd
Removing bin/unlz4
Removing bin/unlzma
Removing bin/unxz
Removing bin/unzstd
Removing bin/vault
Removing bin/vde_autolink
Removing bin/vde_over_ns
Removing bin/vde_pcapplug
Removing bin/vde_plug
Removing bin/vde_plug2tap
Removing bin/vde_router
Removing bin/vde_switch
Removing bin/vdecmd
Removing bin/vdeterm
Removing bin/watchgnupg
Removing bin/wheel3
Removing bin/wheel3.10
Removing bin/wheel3.11
Removing bin/wheel3.9
Removing bin/wirefilter
Removing bin/wrjpgcom
Removing bin/xgettext
Removing bin/xz
Removing bin/xzcat
Removing bin/xzcmp
Removing bin/xzdec
Removing bin/xzdiff
Removing bin/xzegrep
Removing bin/xzfgrep
Removing bin/xzgrep
Removing bin/xzless
Removing bin/xzmore
Removing bin/yarn
Removing bin/yarnpkg
Removing bin/yat2m
Removing bin/zstd
Removing bin/zstdcat
Removing bin/zstdgrep
Removing bin/zstdless
Removing bin/zstdmt
Removing etc/
Removing include/
Removing lib/
Removing opt/
Removing sbin/
Removing share/
Removing var/
/opt/homebrew/Library/Homebrew/cmd/update.sh: line 45: /opt/homebrew/bin/git: No such file or directory
/opt/homebrew/Library/Homebrew/cmd/update.sh: line 45: /opt/homebrew/bin/git: No such file or directory
/opt/homebrew/Library/Homebrew/cmd/update.sh: line 45: /opt/homebrew/bin/git: No such file or directory
/opt/homebrew/Library/Homebrew/cmd/update.sh: line 45: /opt/homebrew/bin/git: No such file or directory
/opt/homebrew/Library/Homebrew/cmd/update.sh: line 45: /opt/homebrew/bin/git: No such file or directory
/opt/homebrew/Library/Homebrew/cmd/update.sh: line 45: /opt/homebrew/bin/git: No such file or directory
==> Downloading https://ghcr.io/v2/homebrew/portable-ruby/portable-ruby/blobs/sha256:d783cbeb6e6ef0d71c0b442317b54554370decd6fac66bf2d4938c07a63f67be
############################################################################################################################################################################ 100.0%
==> Pouring portable-ruby-3.1.4.arm64_big_sur.bottle.tar.gz
Error: update-report should not be called directly!```

Exact contents of the hook:
```printf '\npost-checkout hook\n\n'

prevHEAD=$1
newHEAD=$2
checkoutType=$3

if [ $checkoutType == 1 ]
then
    echo '!! ----------------------------------------------------- !!'
    echo '   Cleaning out ignored files left from previous branch.'
    echo '!! ----------------------------------------------------- !!'

    git clean -fXd
fi```

Is there a way to disable homebrew from using those hooks or do I just need to scope the git config closer to where my repositories are? I really don't want to have to set the hooks in every repository I have. 

[SMillerDev]

Is there a way to disable homebrew from using those hooks or do I just need to scope the git config closer to where my repositories are? I really don't want to have to set the hooks in every repository I have.

If there is a way to disable them for a single repository, you can do that on $(brew --repo).

Seeing how Homebrew manages its updates by switching git tags, this is expected behaviour though.

[KiyoIchikawa]

Thank you!