[oe] [meta-webserver][PATCH] meta-webserver: apache2 allow SYSTEMD_AUTO_ENABLE to be overwritten

[Mark Asselstine]

The current assignment does not allow a bbappend to be used to
overwrite the SYSTEMD_AUTO_ENABLE value in order to have apache2 auto
start. You would have to resort to 'manually' creating a link in
do_install or a postinst. Using the '?=' assignment will correct this.

One might argue that if apache2 is being installed it would be
desirable to have it auto run, so this setting should be removed in
favor of the default in systemd.bbclass (enable). In order not to
surprise users of this recipe with this change in behavior we opt to
keep this as disabled but overwrite-able.

Signed-off-by: Mark Asselstine <mark.asselstine at windriver.com>
---
 meta-webserver/recipes-httpd/apache2/apache2_2.4.29.bb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta-webserver/recipes-httpd/apache2/apache2_2.4.29.bb b/meta-webserver/recipes-httpd/apache2/apache2_2.4.29.bb
index f0298b9..60fc411 100644
--- a/meta-webserver/recipes-httpd/apache2/apache2_2.4.29.bb
+++ b/meta-webserver/recipes-httpd/apache2/apache2_2.4.29.bb
@@ -32,7 +32,7 @@ S = "${WORKDIR}/httpd-${PV}"
 inherit autotools update-rc.d pkgconfig systemd
 
 SYSTEMD_SERVICE_${PN} = "apache2.service"
-SYSTEMD_AUTO_ENABLE_${PN} = "disable"
+SYSTEMD_AUTO_ENABLE_${PN} ?= "disable"
 
 SSTATE_SCAN_FILES += "apxs config_vars.mk config.nice"
 
-- 
2.7.4