[yocto] [RFC][PATCH 1/1] kernel.bbclass: Do not overwrite pre/postinst

[Oliver Stäbler]

If a recipe sets a custom pre/postinst function for kernel-image, this
function gets discarded, which means there is no possibility to set a
custom pre/postinst function.

We check if there is a custom pre/postinst function and only set the
default function if nothing is set.

Signed-off-by: Oliver Stäbler <oliver.staebler at bytesatwork.ch>
---
 meta/classes/kernel.bbclass | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 2a765547ac..e553460566 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -66,11 +66,13 @@ python __anonymous () {
         d.setVar('ALLOW_EMPTY_kernel-image-' + typelower, '1')
 
         priority = d.getVar('KERNEL_PRIORITY')
-        postinst = '#!/bin/sh\n' + 'update-alternatives --install /' + imagedest + '/' + type + ' ' + type + ' ' + type + '-${KERNEL_VERSION_NAME} ' + priority + ' || true' + '\n'
-        d.setVar('pkg_postinst_kernel-image-' + typelower, postinst)
+        if not d.getVar('pkg_postinst_kernel-image-' + typelower):
+                postinst = '#!/bin/sh\n' + 'update-alternatives --install /' + imagedest + '/' + type + ' ' + type + ' ' + type + '-${KERNEL_VERSION_NAME} ' + priority + ' || true' + '\n'
+                d.setVar('pkg_postinst_kernel-image-' + typelower, postinst)
 
-        postrm = '#!/bin/sh\n' + 'update-alternatives --remove' + ' ' + type + ' ' + type + '-${KERNEL_VERSION_NAME} || true' + '\n'
-        d.setVar('pkg_postrm_kernel-image-' + typelower, postrm)
+        if not d.getVar('pkg_postrm_kernel-image-' + typelower):
+                postrm = '#!/bin/sh\n' + 'update-alternatives --remove' + ' ' + type + ' ' + type + '-${KERNEL_VERSION_NAME} || true' + '\n'
+                d.setVar('pkg_postrm_kernel-image-' + typelower, postrm)
 
     image = d.getVar('INITRAMFS_IMAGE')
     if image:
-- 
2.13.5