test: new regression test to verify multi-chain deps

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

test/Makefile.am

@@ -32,6 +32,7 @@ EXTRA_DIST		+= add-remove-dynamic-service-sub-config.sh
 EXTRA_DIST		+= bootstrap-crash.sh
 EXTRA_DIST		+= cond-start-task.sh
 EXTRA_DIST		+= crashing.sh
+EXTRA_DIST		+= dep-chain-reload.sh
 EXTRA_DIST		+= depserv.sh
 EXTRA_DIST		+= devmon.sh
 EXTRA_DIST		+= failing-sysv.sh
@@ -74,6 +75,7 @@ TESTS			+= add-remove-dynamic-service-sub-config.sh
 TESTS			+= bootstrap-crash.sh
 TESTS			+= cond-start-task.sh
 TESTS			+= crashing.sh
+TESTS			+= dep-chain-reload.sh
 TESTS			+= depserv.sh
 TESTS			+= devmon.sh
 TESTS			+= failing-sysv.sh

test/dep-chain-reload.sh

@@ -0,0 +1,122 @@
+#!/bin/sh
+# Verify transitive dependency chain during reload and crash
+#
+# Three services in a chain: A → B → C, where B depends on pid/A
+# and C depends on pid/B.  B is placed in a sub-config file so
+# we can use 'initctl touch' on it.  B uses <!pid/svc_a> (with
+# leading '!') so it does not support SIGHUP, causing a full
+# stop/start cycle on 'initctl touch svc_b.conf' + reload.
+#
+# Test 1 - touch + reload:
+#   After 'initctl touch svc_b.conf' + 'initctl reload':
+#     - A should be unaffected (same PID)
+#     - B is restarted (config was touched, noreload)
+#     - C must be restarted (transitive, depends on pid/B)
+#
+# Test 2 - crash (kill -9):
+#   When B is killed with SIGKILL the crash path (RUNNING →
+#   HALTED) bypasses STOPPING, where cond_clear() used to be
+#   the only call site.  The pidfile plugin only watches for
+#   IN_CLOSE_WRITE, so neither the pidfile removal (IN_DELETE)
+#   nor a pidfile touch (IN_ATTRIB) triggers an inotify event.
+#   Without the fix in service_cleanup(), pid/B is never
+#   invalidated and C is never restarted.
+
+set -eu
+
+TEST_DIR=$(dirname "$0")
+
+test_teardown()
+{
+    say "Running test teardown."
+    run "rm -f $FINIT_RCSD/svc_b.conf"
+}
+
+pidof()
+{
+    texec initctl -j status "$1" | jq .pid
+}
+
+test_setup()
+{
+    run "cat >> $FINIT_CONF" <<EOF
+service log:stdout notify:pid               name:svc_a serv -np -i svc_a -- Chain root
+service log:stdout notify:pid <pid/svc_b>   name:svc_c serv -np -i svc_c -- Needs B
+EOF
+    run "echo 'service log:stdout notify:pid <!pid/svc_a> name:svc_b serv -np -i svc_b -- Needs A' > $FINIT_RCSD/svc_b.conf"
+}
+
+# shellcheck source=/dev/null
+. "$TEST_DIR/lib/setup.sh"
+
+sep "Configuration"
+run "cat $FINIT_CONF"
+run "cat $FINIT_RCSD/svc_b.conf"
+
+say "Reload Finit to start all services"
+run "initctl reload"
+
+say "Wait for full chain to start"
+retry 'assert_status "svc_c" "running"' 10 1
+
+run "initctl status"
+run "initctl cond dump"
+
+# ――――――――――――――――――――――――――――――――――――――――――――――――――――――
+# Test 1: touch + reload
+# ――――――――――――――――――――――――――――――――――――――――――――――――――――――
+sep "Test 1: Touch B and global reload"
+
+pid_a=$(pidof svc_a)
+pid_b=$(pidof svc_b)
+pid_c=$(pidof svc_c)
+say "PIDs before: A=$pid_a B=$pid_b C=$pid_c"
+
+run "initctl touch svc_b.conf"
+run "initctl reload"
+
+say "Wait for chain to settle"
+retry 'assert_status "svc_c" "running"' 15 1
+
+run "initctl status"
+run "initctl cond dump"
+
+new_pid_a=$(pidof svc_a)
+new_pid_b=$(pidof svc_b)
+new_pid_c=$(pidof svc_c)
+say "PIDs after:  A=$new_pid_a B=$new_pid_b C=$new_pid_c"
+
+# shellcheck disable=SC2086
+assert "A was not restarted"              $new_pid_a -eq $pid_a
+# shellcheck disable=SC2086
+assert "B was restarted (touched)"        $new_pid_b -ne $pid_b
+# shellcheck disable=SC2086
+assert "C was restarted (transitive dep)" $new_pid_c -ne $pid_c
+
+# ――――――――――――――――――――――――――――――――――――――――――――――――――――――
+# Test 2: crash (kill -9), bypasses STOPPING
+# ――――――――――――――――――――――――――――――――――――――――――――――――――――――
+sep "Test 2: Kill B with SIGKILL (bypasses STOPPING)"
+
+pid_b=$(pidof svc_b)
+pid_c=$(pidof svc_c)
+say "PIDs before: B=$pid_b C=$pid_c"
+
+run "kill -9 $pid_b"
+
+say "Wait for B to respawn and chain to settle"
+retry 'assert_status "svc_c" "running"' 15 1
+
+run "initctl status"
+run "initctl cond dump"
+
+new_pid_b=$(pidof svc_b)
+new_pid_c=$(pidof svc_c)
+say "PIDs after:  B=$new_pid_b C=$new_pid_c"
+
+# shellcheck disable=SC2086
+assert "B was restarted (crashed+respawn)" $new_pid_b -ne $pid_b
+# shellcheck disable=SC2086
+assert "C was restarted (transitive dep)"  $new_pid_c -ne $pid_c
+
+return 0