systemd.bbclass: Clarify error message

When this error is triggered, its a bit vague in specifying where the
issue is e.g.

ERROR: nbd-3.26.1-r0 do_package: nbd does not appear in package list, please add it

Some packages may intentionally remove PN from packages and find it
confusing as to why the system is still asking this to be in PACKAGES

(From OE-Core rev: 1ca6b396e2ac7088e4228a1b86fe25c6f7fb7a21)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 025a5e4529dff37a6423d305b12b7a51ceedd9e5)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/meta/classes-recipe/systemd.bbclass b/meta/classes-recipe/systemd.bbclass
index 48b364c1d4..0f7e3b5a08 100644
--- a/meta/classes-recipe/systemd.bbclass
+++ b/meta/classes-recipe/systemd.bbclass
@@ -85,7 +85,7 @@ python systemd_populate_packages() {
     def systemd_check_package(pkg_systemd):
         packages = d.getVar('PACKAGES')
         if not pkg_systemd in packages.split():
-            bb.error('%s does not appear in package list, please add it' % pkg_systemd)
+            bb.error('%s is marked for packaging systemd scripts, but it does not appear in package list, please add it to PACKAGES or adjust SYSTEMD_PACKAGES accordingly' % pkg_systemd)
 
 
     def systemd_generate_package_scripts(pkg):