Add debian/agent-launch: Helper script for conditionally starting the SSH agent in the user session

Use it in ssh-agent.user-session.upstart. This will also be used in a
corresponding systemd user unit.

This replaces the backgrounded "ssh-agent -s" with a foreground task which
works more nicely with modern init systems for logging/debugging and
starting/stopping.

Also use a fixed socket file name in $XDG_RUNTIME_DIR -- under both upstart and
systemd we can assume this, and it allows restarting the service in a running
session.

1 files changed, 29 insertions, 0 deletions

diff --git a/debian/agent-launch b/debian/agent-launch
new file mode 100755
index 000000000..40479b868
--- /dev/null
+++ b/debian/agent-launch
@@ -0,0 +1,29 @@
+#!/bin/sh
+# helper script for launching ssh-agent, used by systemd unit and upstart job
+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=$S SSH_AGENT_LAUNCHER=openssh
+        if type initctl >/dev/null 2>&1; then
+            initctl set-env --global SSH_AUTH_SOCK=$S
+        fi
+        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=
+        if type initctl >/dev/null 2>&1; then
+            initctl unset-env --global SSH_AUTH_SOCK
+        fi
+    fi
+else
+    echo "Unknown command $1" >&2
+    exit 1
+fi