osx El Capitain 开发环境
osx El Capitain 系统更新后原来的开发环境需要修改，以下摘抄如何修改
Xcode developer tools在刚刚安装el capitaion之后是无法使用的，很多命令与工具明明存在于/usr/bin下但就是无法使用，让人非常郁闷
重新安装xcode developer tools
El Capitain Broke My Developer Stuff! Here’s How to Fix It
Last night I installed OSX’s new “El Capitain” update, and it broke most of the tools I use in my daily life as a developer, including homebrew and git. Here are the steps I had to follow to get everything working again.
###1) Disable System Integrity Protection
System Integrity Protection is a new feature of OSX, also called “rootless.” As the nickname suggests, it creates another level of access above your root account. The nerfed root account can’t modify anything in a (broad) list of system files, folders, or processes. This makes sense for most users, who blindly enter their sudo password for any installer that asks. It is not so good for developers, who regularly use these folders. Homebrew is one application that expects access to /usr/local, a protected folder. Other applications that are busted by SIP are OSXFuse, MacGPG, Git… the list goes on. So step one is to disable SIP.
- Reboot into recovery mode (hold Command+R on reboot)
- Access the Terminal from the dropdown menus.
- Run csrutil disable
- Reboot back into OSX
###2) Fix permissions on /usr/local
Open the terminal and run:
This fixes the permissions to what homebrew and other applications expect: you own the directory and all its contents. It also changes the flags for SIP, to allow future modifications if you choose to re-enable it.
###3) Fix developer tools
I also found that every time I tried to run…. well almost anything, I would get errors like this:
It took 5 minutes to download and install on my system.
###4) Fix homebrew
To make sure your homebrew install is working again:
Follow any instructions the good doctor gives you! Here’s what I did:
Those were probably more to do with how badly I maintain my own homebrew cellar than anything else, but if the doctor gives you instructions, follow them!
Finally, update your brew-installed applications – many of them have updates for El Capitain.
###5) Fix git
You’re not using the outdated version of git that comes with Xcode developer tools(2.3.8), are you? No, you’re using the current release (2.5.3), downloaded from git-scm.com. Whether you had it previously installed, or just installed it now, it lives in /usr/local/git . But the system will still default to using the old Xcode version. Here’s how to fix that:
###6) Re-install GPGTools
The GPGTools team have done a great job of handling the known incompatibility between GPGMAil and El Capitain’s version of the Mail application… but I still had trouble with the other parts of the suite (which I actually use). I found it easiest to just download and re-install.
###7) Optional, but recommended: tell me about good Linux laptops
I understand how SIP is helpful for normal consumers, but developers are not normal consumers. This step by Apple crosses my comfort barrier, so I’m officially interested in a linux laptop for the first time in years. I have a while to decide, but if you know of a Linux laptop that can compete with my Macbook Air in terms of convenience, sexiness, and reliability, please post about it in the comments.
That’s everything I had to do to get my system back in working order… for now. I’ll update this post if I find more steps!