If your computer has APFS volumes, Unlock will not work on your computer. Try https://github.com/openwall-com-au/BootUnlock instead.
Unlock allows the system to unlock and mount Core Storage encrypted volumes during boot. In other words, this allows you to log in as a user whose home directory is on an encrypted secondary disk without any problems.
Like a many power users, I have two disks in my Macbook Pro. My startup volume is on a SSD and all of my home folder is on a second disk drive. Mac OS X Lion's FileVault 2 supports unlocking and mounting the startup volume, but doesn't support unlocking any other volume until a user has logged in. After encrypting my home drive and restarting, I was locked out of my user account and had to log in to and out of another user just to log in in as myself. This program solves that problem by unlocking Core Storage volumes (e.g., my home disk) without the need for another user account. Simply put, it allows me to log in like normal.
Run this in the terminal.
curl -L https://raw.github.com/jridgewell/Unlock/master/install.sh | bash
Run this in the terminal (you'll be asked for your login password) to remove all traces from the system.
curl -L https://raw.github.com/jridgewell/Unlock/master/uninstall.sh | bash
No, this program only unlocks volumes during boot. You must encrypt the volumes yourself before using this program.
The passphrase is stored in the encrypted System Keychain. Only users with administrative access to the computer will be able to retrieve the passphrase, but all user's will be able to unlock the volume (see next question).
Yes it will. The program is not aware of who is logging in and I don't know of a way to make it aware other than making it a User LaunchDaemon, which won't work. A pull request implementing this would be greatly appreciated.
Yes. Because the System Keychain is tied to its system, your drive can't be pulled out of the computer and unlocked using another computer. Only users of your own system will be able to unlock the volume, and even then, inbuilt security measures will prevent nonadministrative users from getting any data.
Yes, this program will continue to work even after updates. Because Apple doesn't delete LaunchDaemons during updates, the program will always be there to run on startup. And because the program uses Apple's supported APIs, the program will continue to work.
If Apple does fix the bug, the program will not harm nor interfere in anyway. Because of the way the program works, the worst case scenario is a warning appearing in the console logs. Run the uninstall script and everything will go back to normal.