brew update：以下未跟踪的工作树文件将被合并覆盖：

如何解决brew update：以下未跟踪的工作树文件将被合并覆盖：

不要忘记获取原点：

cd /usr/local/Homebrew
git fetch origin
git reset --hard origin/master

发生的情况是您正在尝试更新 brew，但 brew 本身不是最新的（可能），通过某些操作系统更新发生了权限更改（也可能），或者 brew 稍微损坏（不太可能）。由于 brew 本身是一个 git repo，因此您必须将 brew 更新或重置为 master 分支版本。brew [默认] 位于/usr/local/Homebrew文件夹中，所以你

转到该文件夹[第一个命令]，它也应该更新权限（如果没有见下文）
获取原点 [第二条命令]，这意味着更新 brew 远程分支的本地版本
基于远程主分支（也使用您当前的权限）的硬重置 [3rd command]。

chown如果您在非 sudo 或管理员配置文件中，您也可以使用第一个命令

sudo chown -R `whoami` /usr/local/Homebrew
cd /usr/local/Homebrew
git reset --hard origin/master

要了解 git reset，请查看这篇文章。

解决方法

我尝试运行brew update，但如果我合并我的本地更改将会丢失。我尝试提交我的本地更改（不记得做过任何更改，但已经有一段时间了），这让事情变得更糟。

这是输出：

MBP:Library User$ sudo brew update
error: The following untracked working tree files would be overwritten by merge:
    Library/Aliases/fastcgi
    Library/Aliases/htop
    Library/Aliases/nodejs
    Library/Aliases/ocio
    Library/Aliases/oiio
    Library/Aliases/pgrep
    Library/Aliases/pkill
    Library/Contributions/cmds/brew-beer.rb
    Library/Contributions/cmds/brew-dirty.rb
    Library/Contributions/cmds/brew-graph
    Library/Contributions/cmds/brew-grep
    Library/Contributions/cmds/brew-leaves.rb
    Library/Contributions/cmds/brew-linkapps.rb
    Library/Contributions/cmds/brew-man
    Library/Contributions/cmds/brew-mirror-check.rb
    Library/Contributions/cmds/brew-missing.rb
    Library/Contributions/cmds/brew-pull.rb
    Library/Contributions/cmds/brew-readall.rb
    Library/Contributions/cmds/brew-server
    Library/Contributions/cmds/brew-services.rb
    Library/Contributions/cmds/brew-switch.rb
    Library/Contributions/cmds/brew-test-bot.commit.html.erb
    Library/Contributions/cmds/brew-test-bot.css
    Library/Contributions/cmds/brew-test-bot.index.html.erb
    Library/Contributions/cmds/brew-test-bot.rb
    Library/Contributions/cmds/brew-tests.rb
    Library/Contributions/cmds/brew-unpack.rb
    Library/Contributions/cmds/brew-which.rb
    Library/Contributions/install_homebrew.rb
    Library/Formula/abcl.rb
    Library/Formula/abyss.rb
    Library/Formula/akka.rb
    Library/Formula/apollo.rb
    Library/Formula/appledoc.rb
    Library/Formula/arangodb.rb
    Library/Formula/autoconf.rb
    Library/Formula/automake.rb
    Library/Formula/avidemux.rb
    Library/Formula/bind.rb
    Library/Formula/bsdconv.rb
    Library/Formula/bsdmake.rb
    Library/Formula/camellia.rb
    Library/Formula/cbmbasic.rb
    Library/Formula/cdo.rb
    Library/Formula/checkstyle.rb
    Library/Formula/cifer.rb
    Library/Formula/clhep.rb
    Library/Formula/collada-dom.rb
    Library/Formula/crash.rb
    Library/Formula/crossroads.rb
    Library/Formula/css-crush.rb
    Library/Formula/curlftpfs.rb
    Library/Formula/dart.rb
    Library/Formula/dasm.rb
    Library/Formula/dfc.rb
    Library/Formula/di.rb
    Library/Formula/dsniff.rb
    Library/Formula/dupx.rb
    Library/Formula/dwatch.rb
    Library/Formula/eprover.rb
    Library/Formula/ext2fuse.rb
    Library/Formula/ezlupdate.rb
    Library/Formula/f3.rb
    Library/Formula/fastx_toolkit.rb
    Library/Formula/fceux.rb
    Library/Formula/findbugs.rb
    Library/Formula/freerdp.rb
    Library/Formula/funcoeszz.rb
    Library/Formula/fwknop.rb
    Library/Formula/gabedit.rb
    Library/Formula/gbdfed.rb
    Library/Formula/gconf.rb
    Library/Formula/git-encrypt.rb
    Library/Formula/glm.rb
    Library/Formula/gmap-gsnap.rb
    Library/Formula/gnu-arch.rb
    Library/Formula/gnunet.rb
    Library/Formula/gobby.rb
    Library/Formula/gptfdisk.rb
    Library/Formula/griffon.rb
    Library/Formula/grok.rb
    Library/Formula/gtk-chtheme.rb
    Library/Formula/gtkglextmm.rb
    Library/Formula/gtmess.rb
    Library/Formula/hg-flow.rb
    Library/Formula/hqx.rb
    Library/Formula/htop-osx.rb
    Library/Formula/htpdate.rb
    Library/Formula/imap-uw.rb
    Library/Formula/iozone.rb
    Library/Formula/ipbt.rb
    Library/Formula/ipe.rb
    Library/Formula/ispc.rb
    Library/Formula/ispell.rb
    Library/Formula/jigdo.rb
    Library/Formula/jing.rb
    Library/Formula/jless.rb
    Library/Formula/jpeginfo.rb
    Library/Formula/konoha.rb
    Library/Formula/legit.rb
    Library/Formula/libcouchbase.rb
    Library/Formula/libcuefile.rb
    Library/Formula/libextractor.rb
    Library/Formula/libglademm.rb
    Library/Formula/libgtextutils.rb
    Library/Formula/libinfinity.rb
    Library/Formula/libkate.rb
    Library/Formula/libqalculate.rb
    Library/Formula/libqglviewer.rb
    Library/Formula/libreplaygain.rb
    Library/Formula/libtool.rb
    Library/Formula/libvbucket.rb
    Library/Formula/libvo-aacenc.rb
    Library/Formula/libxmi.rb
    Library/Formula/lifelines.rb
    Library/Formula/makeicns.rb
    Library/Formula/mathgl.rb
    Library/Formula/meld.rb
    Library/Formula/mesalib-glw.rb
    Library/Formula/minisat.rb
    Library/Formula/minuit2.rb
    Library/Formula/mobile-shell.rb
    Library/Formula/movgrab.rb
    Library/Formula/mp3cat.rb
    Library/Formula/mpich2.rb
    Library/Formula/mrfast.rb
    Library/Formula/musepack.rb
    Library/Formula/ndiff.rb
    Library/Formula/net6.rb
    Library/Formula/nrpe.rb
    Library/Formula/nuttcp.rb
    Library/Formula/oath-toolkit.
Updating aa07533..3f070ef
Aborting
Error: Failed while executing git pull  origin refs/heads/master:refs/remotes/origin/master