test: add test case for adding/removing dependencies via udev rules

test/TEST-17-UDEV-WANTS/Makefile

@@ -0,0 +1,4 @@
+include ../Makefile.guess
+
+all setup clean run:
+	@basedir=../.. TEST_BASE_DIR=../ BUILD_DIR=$(BUILD_DIR) ./test.sh --$@

test/TEST-17-UDEV-WANTS/test.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+set -e
+TEST_DESCRIPTION="UDEV SYSTEMD_WANTS property"
+TEST_NO_NSPAWN=1
+
+. $TEST_BASE_DIR/test-functions
+QEMU_TIMEOUT=180
+
+test_setup() {
+    create_empty_image
+    mkdir -p $TESTDIR/root
+    mount ${LOOPDEV}p1 $TESTDIR/root
+
+    (
+        LOG_LEVEL=5
+        eval $(udevadm info --export --query=env --name=${LOOPDEV}p2)
+
+        setup_basic_environment
+
+        # mask some services that we do not want to run in these tests
+        ln -s /dev/null $initdir/etc/systemd/system/systemd-hwdb-update.service
+        ln -s /dev/null $initdir/etc/systemd/system/systemd-journal-catalog-update.service
+        ln -s /dev/null $initdir/etc/systemd/system/systemd-networkd.service
+        ln -s /dev/null $initdir/etc/systemd/system/systemd-networkd.socket
+        ln -s /dev/null $initdir/etc/systemd/system/systemd-resolved.service
+
+        # setup the testsuite service
+        cat >$initdir/etc/systemd/system/testsuite.service <<EOF
+[Unit]
+Description=Testsuite service
+
+[Service]
+ExecStart=/bin/sh -x /testsuite.sh
+Type=oneshot
+StandardOutput=tty
+StandardError=tty
+EOF
+        cp testsuite.sh $initdir/
+
+        setup_testsuite
+    ) || return 1
+
+    ddebug "umount $TESTDIR/root"
+    umount $TESTDIR/root
+}
+
+do_test "$@"

test/TEST-17-UDEV-WANTS/testsuite.sh

@@ -0,0 +1,76 @@
+#!/bin/bash
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+set -ex
+set -o pipefail
+
+mkdir -p /run/udev/rules.d/
+
+rm -f /run/udev/rules.d/50-testsuite.rules
+udevadm control --reload
+udevadm trigger /dev/sda
+
+while : ; do
+    (
+        udevadm info /dev/sda | grep -q -v SYSTEMD_WANTS=foobar.service
+        udevadm info /dev/sda | grep -q -v SYSTEMD_WANTS=waldo.service
+        systemctl show -p WantedBy foobar.service | grep -q -v sda
+        systemctl show -p WantedBy waldo.service | grep -q -v sda
+    ) && break
+
+    sleep .5
+done
+
+cat > /run/udev/rules.d/50-testsuite.rules <<EOF
+ACTION!="remove", SUBSYSTEM=="block", KERNEL=="sda", ENV{SYSTEMD_WANTS}="foobar.service"
+EOF
+udevadm control --reload
+udevadm trigger /dev/sda
+
+while : ; do
+    (
+        udevadm info /dev/sda | grep -q SYSTEMD_WANTS=foobar.service
+        udevadm info /dev/sda | grep -q -v SYSTEMD_WANTS=waldo.service
+        systemctl show -p WantedBy foobar.service | grep -q sda
+        systemctl show -p WantedBy waldo.service | grep -q -v sda
+    ) && break
+
+    sleep .5
+done
+
+cat > /run/udev/rules.d/50-testsuite.rules <<EOF
+ACTION!="remove", SUBSYSTEM=="block", KERNEL=="sda", ENV{SYSTEMD_WANTS}="waldo.service"
+EOF
+udevadm control --reload
+udevadm trigger /dev/sda
+
+while : ; do
+    (
+        udevadm info /dev/sda | grep -q -v SYSTEMD_WANTS=foobar.service
+        udevadm info /dev/sda | grep -q SYSTEMD_WANTS=waldo.service
+        systemctl show -p WantedBy foobar.service | grep -q -v sda
+        systemctl show -p WantedBy waldo.service | grep -q sda
+    ) && break
+
+    sleep .5
+done
+
+rm /run/udev/rules.d/50-testsuite.rules
+
+udevadm control --reload
+udevadm trigger /dev/sda
+
+while : ; do
+    (
+        udevadm info /dev/sda | grep -q -v SYSTEMD_WANTS=foobar.service
+        udevadm info /dev/sda | grep -q -v SYSTEMD_WANTS=waldo.service
+        systemctl show -p WantedBy foobar.service | grep -q -v sda
+        systemctl show -p WantedBy waldo.service | grep -q -v sda
+    ) && break
+
+    sleep .5
+done
+
+echo OK > /testok
+
+exit 0