/usr/lib/openssh/agent-launch is in openssh-client 1:7.6p1-4ubuntu0.3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | #!/bin/sh
# helper script for launching ssh-agent, used by systemd unit
set -e
if [ ! -d "$XDG_RUNTIME_DIR" ]; then
echo 'This needs $XDG_RUNTIME_DIR to be set' >&2
exit 1
fi
if [ "$1" = start ]; then
if [ -z "$SSH_AUTH_SOCK" ] && grep -s -q '^use-ssh-agent$' /etc/X11/Xsession.options; then
S="$XDG_RUNTIME_DIR/openssh_agent"
dbus-update-activation-environment --verbose --systemd SSH_AUTH_SOCK=$S SSH_AGENT_LAUNCHER=openssh
exec ssh-agent -D -a $S
fi
elif [ "$1" = stop ]; then
if [ "$SSH_AGENT_LAUNCHER" = openssh ]; then
dbus-update-activation-environment --systemd SSH_AUTH_SOCK=
fi
else
echo "Unknown command $1" >&2
exit 1
fi
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