[PATCH 2/4] classes/populate_sdk_ext: prevent do_rootfs from executing

[Paul Eggleton <paul.eggleton@linux.intel.com>]

In order to prepare the build system within the extensible SDK, we
actually go ahead and build the targets specified by SDK_TARGETS (by
default the image the SDK was built for). Assuming that's an image, we
don't actually need to build the image itself - we just need to have
everything done up to the point before building the image, so that we
have everything needed in the sysroot.

In order to do this, create temporary bbappends for each of the targets
in the workspace layer that stub out do_rootfs. This is a little bit of
a hack but is the least intrusive fix at this point. To make things a
bit tidier, I have split out the preparation commands into a separate
script so we can run that in the appropriate environment rather than all
the commands separately.

Fixes [YOCTO #7590].

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
---
 meta/classes/populate_sdk_ext.bbclass |  5 ++++-
 meta/files/ext-sdk-prepare.sh         | 20 ++++++++++++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)
 create mode 100644 meta/files/ext-sdk-prepare.sh

diff --git a/meta/classes/populate_sdk_ext.bbclass b/meta/classes/populate_sdk_ext.bbclass
index 90033ba..0feb3b2 100644
--- a/meta/classes/populate_sdk_ext.bbclass
+++ b/meta/classes/populate_sdk_ext.bbclass
@@ -203,6 +203,8 @@ install_tools() {
 	install $buildtools_path ${SDK_OUTPUT}/${SDKPATH}
 
 	install ${SDK_DEPLOY}/${BUILD_ARCH}-nativesdk-libc.tar.bz2 ${SDK_OUTPUT}/${SDKPATH}
+
+	install -m 0755 ${COREBASE}/meta/files/ext-sdk-prepare.sh ${SDK_OUTPUT}/${SDKPATH}
 }
 
 # Since bitbake won't run as root it doesn't make sense to try and install
@@ -242,8 +244,9 @@ sdk_ext_postinst() {
 		# dash which is /bin/sh on Ubuntu will not preserve the
 		# current working directory when first ran, nor will it set $1 when
 		# sourcing a script. That is why this has to look so ugly.
-		sh -c ". buildtools/environment-setup* > preparing_build_system.log && cd $target_sdk_dir/`dirname ${oe_init_build_env_path}` && set $target_sdk_dir && . $target_sdk_dir/${oe_init_build_env_path} $target_sdk_dir >> preparing_build_system.log && bitbake ${SDK_TARGETS} >> preparing_build_system.log" || { echo "SDK preparation failed: see `pwd`/preparing_build_system.log" ; exit 1 ; }
+		sh -c ". buildtools/environment-setup* > preparing_build_system.log && cd $target_sdk_dir/`dirname ${oe_init_build_env_path}` && set $target_sdk_dir && . $target_sdk_dir/${oe_init_build_env_path} $target_sdk_dir >> preparing_build_system.log && $target_sdk_dir/ext-sdk-prepare.sh $target_sdk_dir '${SDK_TARGETS}' >> preparing_build_system.log 2>&1" || { echo "SDK preparation failed: see `pwd`/preparing_build_system.log" ; exit 1 ; }
 	fi
+	rm -f $target_sdk_dir/ext-sdk-prepare.sh
 	echo done
 }
 
diff --git a/meta/files/ext-sdk-prepare.sh b/meta/files/ext-sdk-prepare.sh
new file mode 100644
index 0000000..329eec5
--- /dev/null
+++ b/meta/files/ext-sdk-prepare.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+
+# Prepare the build system within the extensible SDK
+
+target_sdk_dir="$1"
+sdk_targets="$2"
+
+# Avoid actually building images during this phase
+# This is a hack, to be sure, but we really don't need to do this here
+mkdir -p $target_sdk_dir/classes
+printf 'python do_rootfs_forcevariable () {\n    bb.utils.mkdirhier(d.getVar("IMAGE_ROOTFS", True))\n}\n' > $target_sdk_dir/classes/extsdk-dummy-build.bbclass
+for sdktarget in $sdk_targets ; do
+	bbappend=`recipetool newappend $target_sdk_dir/workspace $sdktarget`
+	printf "inherit extsdk-dummy-build\n" > $bbappend
+	printf "Created bbappend %s\n" "$bbappend"
+done
+bitbake $sdk_targets || exit 1
+rm -f $target_sdk_dir/classes/extsdk-dummy-build.bbclass
+rmdir $target_sdk_dir/classes || true
+rm -rf $target_sdk_dir/workspace/appends
-- 
2.1.0