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Re:Curl to shell isn't so bad by dickeytk on Sunday November 10, 2019 @12:47PM (#21499117)
They do chroot. You can only install to specific directories
Re:Curl to shell isn't so bad by brianpgordon on Sunday November 10, 2019 @03:06PM (#21499875)
Ah, I found it. On MacOS they rely on sandbox-exec which uses the sandboxing mechanism provided by the kernel:

https://github.com/Homebrew/brew/blob/e2c76cce8e01fd80e0910d...

https://github.com/Homebrew/brew/blob/master/Library/Homebre...