[PATCH 15/26] sdk: Use clean-package-cache rather than open-coded cleanup

[Jan Kiszka <jan.kiszka@siemens.com>]

From: Jan Kiszka <jan.kiszka@siemens.com>

There is nothing that the sdkchroot will gain after its bootstrap.
Therefore we can clean up the apt cache already there, reusing common
infrastructure.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 meta/classes/image-sdk-extension.bbclass     | 3 ---
 meta/recipes-devtools/sdkchroot/sdkchroot.bb | 2 +-
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/meta/classes/image-sdk-extension.bbclass b/meta/classes/image-sdk-extension.bbclass
index 8df3ed1..a53d954 100644
--- a/meta/classes/image-sdk-extension.bbclass
+++ b/meta/classes/image-sdk-extension.bbclass
@@ -13,9 +13,6 @@ do_populate_sdk() {
     # Copy isar-apt with deployed Isar packages
     sudo cp -Trpfx ${REPO_ISAR_DIR}/${DISTRO}  ${SDKCHROOT_DIR}/rootfs/isar-apt
 
-    # Purge apt cache to make image slimmer
-    sudo rm -rf ${SDKCHROOT_DIR}/rootfs/var/cache/apt/*
-
     sudo umount -R ${SDKCHROOT_DIR}/rootfs/dev || true
     sudo umount ${SDKCHROOT_DIR}/rootfs/proc || true
     sudo umount -R ${SDKCHROOT_DIR}/rootfs/sys || true
diff --git a/meta/recipes-devtools/sdkchroot/sdkchroot.bb b/meta/recipes-devtools/sdkchroot/sdkchroot.bb
index 3cfe05c..d2cc92e 100644
--- a/meta/recipes-devtools/sdkchroot/sdkchroot.bb
+++ b/meta/recipes-devtools/sdkchroot/sdkchroot.bb
@@ -23,7 +23,7 @@ ROOTFS_ARCH = "${HOST_ARCH}"
 ROOTFS_DISTRO = "${HOST_DISTRO}"
 ROOTFSDIR = "${S}"
 ROOTFS_PACKAGES = "${SDKCHROOT_PREINSTALL} ${TOOLCHAIN}"
-ROOTFS_FEATURES += ""
+ROOTFS_FEATURES += "clean-package-cache"
 
 python() {
     if d.getVar("HOST_ARCH") not in ['i386', 'amd64']:
-- 
2.16.4