问题
brew install --HEAD watchman
==> Cloning https://github.com/facebook/watchman.git
Updating /Library/Caches/Homebrew/watchman--git
==> Checking out branch master
==> ./autogen.sh
==> ./configure --prefix=/usr/local/Cellar/watchman/HEAD --with-pcre
==> make
==> make install
install: chmod 777 /: Operation not permitted
touch //.not-empty
touch: //.not-empty: Permission denied
make[1]: *** [install-exec-local] Error 1
make: *** [install-am] Error 2
couldn't understand kern.osversion `14.5.0'
READ THIS: https://git.io/brew-troubleshooting
It is trying to chmod 777 / which is not good. Why is it trying to do that? Feels like that shouldn't be allowed. I tried to uninstall watchman and reinstall with this command to get a react-native to start working.
Followed steps here: https://github.com/facebook/react-native/issues/239
https://facebook.github.io/react-native/docs/troubleshooting.html
回答1:
Ok fixed it
You can install watchman without the --HEAD option (the currently tracked version of watchman is old enough to not have the issue specified). So just do a brew install watchman.
If you then get issues with your react project make sure that your project directory is a git repo (run git init if not) see:
https://github.com/facebook/react-native/issues/2032
https://github.com/facebook/react-native/issues/2042
回答2:
brew uninstall watchman
sudo chown -R `whoami` /usr/local
brew link pcre
brew install watchman
回答3:
Sorry about this, should be fixed now in https://github.com/facebook/watchman/commit/b35c6ed36a5f60ab3f214ddc646a8a03e03a0fee
回答4:
Fix for installing on OSX high sierra 10.13.2 required reinstalling homebrew since it needs to work around the non-writeable /usr/local/ folder
I had to reinstall homebrew:
uninstall:
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)"
reinstall:
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
回答5:
Try
brew update
brew doctor
brew install watchman
If you are still having problems, try going to your_project/node_modules/react-native/packager/react-packager/src/FileWatcher/index.js and increase the MAX_WAIT_TIME
来源：https://stackoverflow.com/questions/32105860/the-command-brew-install-watchman-runs-chmod-but-fails-to-install-eventually