openrc-run: Chdir into HOME for user services.

Some services might expect to be in home, and may behave unexpectedly
for the user, e.g. any program started via dbus, and this matches
systemd-user behaviour.

src/openrc-run/openrc-run.c

@@ -1099,6 +1099,7 @@ int main(int argc, char **argv)
 	char *path = NULL;
 	char *lnk = NULL;
 	char *dir, *save = NULL, *saveLnk = NULL;
+	const char *workingdir = "/";
 	char *pidstr = NULL;
 	size_t l = 0, ll;
 	const char *file;
@@ -1160,8 +1161,12 @@ int main(int argc, char **argv)
 	if (argc < 3)
 		usage(EXIT_FAILURE);
 
-	/* Change dir to / to ensure all init scripts don't use stuff in pwd */
-	if (chdir("/") == -1)
+	/* Change dir to / to ensure all init scripts don't use stuff in pwd
+	 * For user services, change to the user's HOME instead. */
+	if (rc_is_user() && !(workingdir = getenv("HOME")))
+		eerrorx("HOME is unset.");
+
+	if (chdir(workingdir) == -1)
 		eerror("chdir: %s", strerror(errno));
 
 	if ((runlevel = xstrdup(getenv("RC_RUNLEVEL"))) == NULL) {