FreeBSD里使用CBSD创建了一个jail， jail里面pkg 命令可以用，但是不管发什么命令，都会提示更新pkg，按Y确认更新，

更新完之后就退出。

再发pkg命令，又是同样提示更新pkg，导致无法pkg search ，无法pkg update，更无法pkg install git 

使用ports安装

cd /usr/ports/ports-mgmt/pkg && make install 

报错：

===>  Installing for pkg-1.21.3
===>  Checking if pkg is already installed
===>   pkg-1.21.3 is already installed
      You may wish to ``make deinstall'' and install this port again
      by ``make reinstall'' to upgrade it properly.
      If you really wish to overwrite the old port of pkg
      without deleting it first, set the variable "FORCE_PKG_REGISTER"
      in your environment or the "make install" command line.
*** Error code 1
 

按照提示输入

make deinstall ; make reinstall

还是报错已经安装了pkg

这时候再执行pkg install git ，哇，竟然成功了！