Refactor ready:script to support new notify framework

Follow-up to abcb3ce, calling the service ready:script when readiness
has been signaled to or detected by Finit.

Issue #300

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

test/ready-serv.sh

@@ -0,0 +1,50 @@
+#!/bin/sh
+# Verify ready:script for pid/systemd/s6 style services
+set -eu
+
+TEST_DIR=$(dirname "$0")
+
+test_setup()
+{
+	say "Test start $(date)"
+}
+
+test_teardown()
+{
+	say "Test done $(date)"
+
+	texec rm -f "$FINIT_CONF"
+}
+
+test_one()
+{
+	service=$1
+	file=/tmp/ready
+
+	say "Add service stanza '$service' to $FINIT_CONF ..."
+	texec sh -c "echo '$service' > $FINIT_CONF"
+
+	say 'Reload Finit'
+	texec sh -c "initctl reload"
+
+	retry 'assert_num_children 1 serv'
+	assert_file_contains "$file" "READY"
+	texec sh -c "rm -f $file"
+
+	say 'Stop the service'
+	texec sh -c "initctl stop serv"
+	retry 'assert_num_children 0 serv'
+
+	say "Done, drop service from $FINIT_CONF ..."
+	texec sh -c "rm $FINIT_CONF"
+	texec sh -c "initctl reload"
+}
+
+# shellcheck source=/dev/null
+. "$TEST_DIR/tenv/lib.sh"
+
+#texec sh -c "initctl debug"
+
+test_one "service                ready:/bin/ready.sh serv -np       -- Native style notification"
+test_one "service notify:s6      ready:/bin/ready.sh serv -np -N %n -- s6 style notification"
+test_one "service notify:systemd ready:/bin/ready.sh serv -np       -- systemd style notification"