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SETUP.md

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macOS Sierra GnuPG modern setup

In order to install GnuPG modern on macOS and get it running with SSH only a few things are required:

Software installation

As noted in the README install gpg-suite with brew cask.

brew cask install gpg-suite

$HOME/Library/LaunchAgents/gpg.agent.daemon.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Label</key>
	<string>gpg.agent.daemon.plist</string>
	<key>ProgramArguments</key>
	<array>
		<string>/usr/local/MacGPG2/bin/gpgconf</string>
		<string>--launch</string>
		<string>gpg-agent</string>
	</array>
	<key>RunAtLoad</key>
	<true/>
</dict>
</plist>

To set the location of the GPG Agent socket you have two choices:

  • Set it in your rc file, this is the easy way.
  • Set it system wide with launchctl, this ensures you can use GPG with programs launched through the finder and spotlight.

rc file (zsh, bash etc.)

SSH_AUTH_SOCK=$HOME/.gnupg/S.gpg-agent.ssh

$HOME/Library/LaunchAgents/gpg.agent.setenv.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Label</key>
	<string>gpg.agent.setenv</string>
	<key>ProgramArguments</key>
	<array>
		<string>/bin/sh</string>
		<string>-c</string>
		<string>/bin/launchctl setenv SSH_AUTH_SOCK $(/usr/local/MacGPG2/bin/gpgconf --list-dir agent-ssh-socket)</string>
	</array>
	<key>RunAtLoad</key>
	<true/>
</dict>
</plist>

In order for $SSH_AUTH_SOCK not to be overwritten you will need to disable the macOS ssh-agent that is automatically started at boot.
(Un-)fortunately System Integrity Protection prevents you from just running launchctl unload -w /System/Library/LaunchAgents/com.openssh.ssh-agent.plist. You will need to boot into your Recovery OS (hold Cmd+R at boot) and run csrutil disable, then boot normally, run the unload command and then run csrutil enable in the Recovery OS.