brew update fails with "Git must be installed and in your PATH!

brew をアップロードしようとするとエラーが出ました。
助けてください。cocopadsをインストールするまでの準備で妨げになってしまいました。

$ brew update
Warning: git 2.15.1_1 is already installed
Error: Git must be installed and in your PATH!

$ brew config
HOMEBREW_VERSION: >=1.4.0 (shallow or no git repository)
ORIGIN: (none)
HEAD: (none)
Last commit: never
Core tap ORIGIN: (none)
Core tap HEAD: (none)
Core tap last commit: never
HOMEBREW_PREFIX: /usr/local
HOMEBREW_NO_ANALYTICS_THIS_RUN: 1
CPU: quad-core 64-bit broadwell
Homebrew Ruby: 2.3.3 => /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.3.3/bin/ruby
Clang: N/A
Git: N/A
Curl: 7.54.0 => /usr/bin/curl
Perl: /usr/bin/perl
Python: /usr/bin/python
Ruby: /usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
Java: N/A
macOS: 10.12.6-x86_64
Xcode: N/A
CLT: N/A
X11: 2.7.11 => /opt/X11
$ 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: Git could not be found in your PATH.
Homebrew uses Git for several internal functions, and some formulae use Git
checkouts instead of stable tarballs. You may want to install Git:
  brew install git

Warning: No developer tools installed.
Install the Command Line Tools:
  xcode-select --install

そのた情報が必要であればおしらせください。よろしくお願いします。

$which - a git
/usr/local/bin/git
$ echo $PATH
/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin:/Users/TomohisaSutani/.rvm/bin

行動規範の内容に同意します

回答2件

brew doctorの出力にあるようにCommand Line Toolsだけインストールする

bash
1xcode-select --install

もしくはXcodeをインストールする

お好みでどうぞ。

bash
1$ brew config
2HOMEBREW_VERSION: 1.4.1
3ORIGIN: https://github.com/Homebrew/brew
4HEAD: b4d43e950fd45c24e48d6ebfd3013357abcd21a9
5Last commit: 10 days ago
6Core tap ORIGIN: https://github.com/Homebrew/homebrew-core
7Core tap HEAD: 4b0b2f038975925abbda8e0bbd9d27c899c697e4
8Core tap last commit: 6 minutes ago
9HOMEBREW_PREFIX: /usr/local
10CPU: octa-core 64-bit haswell
11Homebrew Ruby: 2.3.3 => /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.3.3/bin/ruby
12Clang: 9.0 build 900
13Git: 2.14.3 => /Applications/Xcode.app/Contents/Developer/usr/bin/git
14Curl: 7.54.0 => /usr/bin/curl
15Perl: /usr/bin/perl
16Python: /usr/local/opt/python/libexec/bin/python => /usr/local/Cellar/python/2.7.14/Frameworks/Python.framework/Versions/2.7/bin/python2.7
17Ruby: /usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
18Java: 1.8.0_121
19macOS: 10.12.6-x86_64
20Xcode: 9.2
21CLT: 9.2.0.0.1.1510905681
22X11: N/A