image.bbclass: add ability to set systemd default target

Add ability to set the default target for systemd images.

The default target for system is controlled by SYSTEMD_DEFAULT_TARGET.
The default value for this variable is derived from checking whether
IMAGE_FEATURES contains 'x11-base' or not. Each image could override
this value in its own recipe. For now, we don't need to do any change,
because all images that support graphical environment has 'x11-base'
in its IMAGE_FEATURES.

[YOCTO #3816]

(From OE-Core rev: 049f89155b1e80875aad6e53b21808b827c06915)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
index c59572104d..4c63bc28fd 100644
--- a/meta/classes/image.bbclass
+++ b/meta/classes/image.bbclass
@@ -186,6 +186,9 @@ IMAGE_MANIFEST = "${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.manifest"
 ROOTFS_POSTPROCESS_COMMAND =+ "write_image_manifest ; "
 # Set default postinst log file
 POSTINST_LOGFILE ?= "${localstatedir}/log/postinstall.log"
+# Set default target for systemd images
+SYSTEMD_DEFAULT_TARGET ?= '${@base_contains("IMAGE_FEATURES", "x11-base", "graphical.target", "multi-user.target", d)}'
+ROOTFS_POSTPROCESS_COMMAND += '${@base_contains("DISTRO_FEATURES", "systemd", "set_systemd_default_target; ", "", d)}'
 
 # some default locales
 IMAGE_LINGUAS ?= "de-de fr-fr en-gb"
@@ -596,6 +599,13 @@ postinst_enable_logging () {
         echo "LOGFILE=${POSTINST_LOGFILE}" >> ${IMAGE_ROOTFS}${sysconfdir}/default/postinst
 }
 
+# Modify systemd default target
+set_systemd_default_target () {
+        if [ -d ${IMAGE_ROOTFS}${sysconfdir}/systemd/system -a -e ${IMAGE_ROOTFS}${systemd_unitdir}/system/${SYSTEMD_DEFAULT_TARGET} ]; then
+                ln -sf ${systemd_unitdir}/system/${SYSTEMD_DEFAULT_TARGET} ${IMAGE_ROOTFS}${sysconfdir}/systemd/system/default.target
+        fi
+}
+
 # Turn any symbolic /sbin/init link into a file
 remove_init_link () {
         if [ -h ${IMAGE_ROOTFS}/sbin/init ]; then