From 40b279e3a33fd47b7e65e0303fcb9be621aeb7d3 Mon Sep 17 00:00:00 2001
From: zimbatm <zimbatm@zimbatm.com>
Date: Wed, 28 Nov 2018 15:24:19 +0100
Subject: [PATCH] ssh: tweak default controlPath

Instead of using the hostname `%h`, which can be changed by the
~/.ssh/config file, use the commandline-given hostname `%n`.

This allows to alias a host with different hostnames, which then point
to different configurations. A common use-case for this is if you have
multiple accounts on github with each access to different private repos:

    Host github.com
      IdentitiesOnly yes
      User git
      IdentityFile ~/.ssh/id_rsa

    Host customer.github.com
      IdentitiesOnly yes
      User git
      IdentityFile ~/.ssh/customer
      HostName github.com

Without this change, if a connection was established with the first
github.com alias, then the user would try to pull a repo from the second
account, ssh would re-use the SSH connection which doesn't have access
to that repository.
---
 modules/programs/ssh.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/programs/ssh.nix b/modules/programs/ssh.nix
index ce7a700c..6423315d 100644
--- a/modules/programs/ssh.nix
+++ b/modules/programs/ssh.nix
@@ -219,7 +219,7 @@ in
 
     controlPath = mkOption {
       type = types.str;
-      default = "~/.ssh/master-%r@%h:%p";
+      default = "~/.ssh/master-%r@%n:%p";
       description = ''
         Specify path to the control socket used for connection sharing.
       '';