Christopher: thanks.

Upstream patching isn't really applicable here, because the script in
question is distribution-specific session-setup code.

As for demo code, here's a tidbit to get the ball rolling:

    if [ -n "$XDG_RUNTIME_DIR" -a -d "$XDG_RUNTIME_DIR" ]; then
      SSHAGENTARGS+="-a $XDG_RUNTIME_DIR/ssh-agent.$$"
    fi

(added right after the "SSHAGENTARGS=-1" conditional)

A couple advantages of this are

1. Old agent sockets are less likely to stick around, because /run/ is a
tmpfs;

2. Searching for my own ssh-agent socket(s) is easier/safer, because I
don't have to worry about /tmp/ssh-*/ directories that belong to someone
else, or (worse) a hostile attacker.

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https://bugs.launchpad.net/bugs/1131383

Title:
  Wishlist: $SSH_AUTH_SOCK in $XDG_RUNTIME_DIR

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