[RFC PATCH 4/6] meta/class/image: Add do_isar task to trigger SDK rootfs creation.

["Maxim Yu. Osipov" <mosipov@ilbers.de>]

User manually triggers creation of SDK root filesystem for his target platform by
launching the task `do_isar_sdk` for target image, f.e.
`bitbake -c do_isar_sdk multiconfig:${MACHINE}-${DISTRO}:isar-image-base`.

The resulting SDK rootfs is located under `tmp/work/${DITSRO}-${DISTRO_ARCH}/sdkchroot/rootfs`.
SDK rootfs directory `/isar-apt` contains the copy of isar-apt repo with locally
prebuilt target debian packages.
One may chroot to SDK and install required target packages with the help of
`apt-get install <package_name>:<DISTRO_ARCH>` command.

Signed-off-by: Maxim Yu. Osipov <mosipov@ilbers.de>
---
 meta/classes/image.bbclass | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
index 4738cb8..dc7da2c 100644
--- a/meta/classes/image.bbclass
+++ b/meta/classes/image.bbclass
@@ -71,3 +71,11 @@ do_copy_boot_files() {
 addtask copy_boot_files before do_build after do_rootfs
 do_copy_boot_files[dirs] = "${DEPLOY_DIR_IMAGE}"
 do_copy_boot_files[stamp-extra-info] = "${DISTRO}-${MACHINE}"
+
+do_isar_sdk() {
+}
+
+do_isar_sdk[stamp-extra-info] = "${MACHINE}-${DISTRO}"
+do_isar_sdk[depends] = "sdkchroot:do_build"
+
+addtask isar_sdk after do_rootfs
-- 
2.11.0