kernel.bbclass: Do not overwrite recipe's custom postinst

Allow recipe to set a custom postinst for kernel image.
Use prependVar in order to allow custom postinst to be
ran after default postinst, potentially modifying the
installed file/symlink.

(From OE-Core rev: 579906b9f4ea32c8d4e0e11a87ee6c9e27cdf0dc)

Signed-off-by: Raphael Teller <raphael.teller@se.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 83785c3b5b..5d2f17c3be 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -110,7 +110,7 @@ python __anonymous () {
 
         d.setVar('PKG:%s-image-%s' % (kname,typelower), '%s-image-%s-${KERNEL_VERSION_PKG_NAME}' % (kname, typelower))
         d.setVar('ALLOW_EMPTY:%s-image-%s' % (kname, typelower), '1')
-        d.setVar('pkg_postinst:%s-image-%s' % (kname,typelower), """set +e
+        d.prependVar('pkg_postinst:%s-image-%s' % (kname,typelower), """set +e
 if [ -n "$D" ]; then
     ln -sf %s-${KERNEL_VERSION} $D/${KERNEL_IMAGEDEST}/%s > /dev/null 2>&1
 else