diff options
authorRichard Purdie <>2014-08-28 10:10:06 +0000
committerRichard Purdie <>2014-09-23 20:31:06 +0100
commite66c96ae9c7ba21ebd04a4807390f0031238a85a (patch)
parentd5e2a59ab59e3d67d09c5f25b8623186af855e17 (diff)
uninative: Add uninative - a way of reusing native/cross over multiple distros
These patches are the start of a new idea, a way of allowing a single set of cross/native sstate to work over mutliple distros, even old ones. The assumption is that our own C library is basically up to date. We build and share a small tarball (~2MB) of a prebuilt copy of this along with a patchelf binary (which sadly is C++ based so libstdc++ is in there). This tarball can be generated from our usual SDK generation process through the supplied recipe, uninative-tarball. At the start of the build, if its not been extracted into the sysroot, this tarball is extracted there and configured for the specified path. When we install binaries from a "uninative" sstate feed, we change the dynamic loader to point at this dynamic loader and C librbary. This works exactly the same way as our relocatable SDK does. The only real difference is a switch to use patchelf, so even if the interpreter section is too small, it can still adjust the binary. Right now this implements a working proof of concept. If you build the tarball and place it at the head of the tree (in COREBASE), you can run a build from sstate and successfully build packages and construct images. There is some improvement needed, its hardcoded for x86_64 right now, its trivial to add 32 bit support too. The tarball isn't fetched right now, there is just a harcoded path assumption and there is no error handling. I haven't figured out the best delivery mechanism for that yet. BuildStarted is probably not the right event to hook on either. I've merged this to illustrate how with a small change, we might make the native/cross sstate much more reusable and hence improve the accessibility of lower overhead builds. With this change, its possible the Yocto Project may be able to support a configured sstate mirror out the box. This also has positive implications for our developer workflow/SDK improvements. Signed-off-by: Richard Purdie <>
2 files changed, 92 insertions, 0 deletions
diff --git a/meta/classes/uninative.bbclass b/meta/classes/uninative.bbclass
new file mode 100644
index 0000000000..51391dbc4a
--- /dev/null
+++ b/meta/classes/uninative.bbclass
@@ -0,0 +1,44 @@
+NATIVELSBSTRING = "universal"
+addhandler uninative_eventhandler
+uninative_eventhandler[eventmask] = "bb.event.BuildStarted"
+python uninative_eventhandler() {
+ loader ="UNINATIVE_LOADER", True)
+ if not os.path.exists(loader):
+ import subprocess
+ cmd ="mkdir -p ${STAGING_DIR}; cd ${STAGING_DIR}; tar -xjf ${COREBASE}/${BUILD_ARCH}-nativesdk-libc.tar.bz2; ${STAGING_DIR}/ ${STAGING_DIR_NATIVE} ${UNINATIVE_LOADER} ${UNINATIVE_LOADER} ${STAGING_BINDIR_NATIVE}/patchelf-uninative")
+ #bb.warn("nativesdk lib extraction: " + cmd)
+ subprocess.check_call(cmd, shell=True)
+SSTATEPOSTUNPACKFUNCS_append = " uninative_changeinterp"
+python uninative_changeinterp () {
+ import subprocess
+ import stat
+ import
+ if not ('native', d) or'crosssdk', d) or'cross', d)):
+ return
+ sstateinst = d.getVar('SSTATE_INSTDIR', True)
+ for walkroot, dirs, files in os.walk(sstateinst):
+ for file in files:
+ f = os.path.join(walkroot, file)
+ if os.path.islink(f):
+ continue
+ s = os.stat(f)
+ if not ((s[stat.ST_MODE] & stat.S_IXUSR) or (s[stat.ST_MODE] & stat.S_IXGRP) or (s[stat.ST_MODE] & stat.S_IXOTH)):
+ continue
+ elf =
+ try:
+ except:
+ continue
+ #bb.warn("patchelf-uninative --set-interpreter %s %s" % (d.getVar("UNINATIVE_LOADER", True), f))
+"patchelf-uninative --set-interpreter %s %s" % (d.getVar("UNINATIVE_LOADER", True), f), shell=True)
diff --git a/meta/recipes-core/meta/ b/meta/recipes-core/meta/
new file mode 100644
index 0000000000..ed1279f09b
--- /dev/null
+++ b/meta/recipes-core/meta/
@@ -0,0 +1,48 @@
+SUMMARY = "libc and patchelf tarball for use with uninative.bbclass"
+LIC_FILES_CHKSUM = "file://${COREBASE}/LICENSE;md5=4d92cd373abda3937c2bc47fbc49d690 \
+ file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
+ nativesdk-eglibc \
+ nativesdk-patchelf \
+ "
+DEPENDS += "patchelf-native"
+inherit meta
+inherit populate_sdk
+deltask install
+deltask package
+fakeroot create_sdk_files() {
+ cp ${COREBASE}/scripts/ ${SDK_OUTPUT}/${SDKPATH}/
+ # Replace the ##DEFAULT_INSTALL_DIR## with the correct pattern.
+ # Escape special characters like '+' and '.' in the SDKPATH
+ escaped_sdkpath=$(echo ${SDKPATH}/sysroots/${SDK_SYS} |sed -e "s:[\+\.]:\\\\\\\\\0:g")
+ sed -i -e "s:##DEFAULT_INSTALL_DIR##:$escaped_sdkpath:" ${SDK_OUTPUT}/${SDKPATH}/
+fakeroot tar_sdk() {
+ mkdir -p ${SDK_DEPLOY}
+ mv sysroots/${SDK_SYS} ./${BUILD_SYS}
+ rm sysroots -rf
+ patchelf --set-interpreter ${@''.join('a' for n in xrange(1024))} ./${BUILD_SYS}/usr/bin/patchelf
+ mv ./${BUILD_SYS}/usr/bin/patchelf ./${BUILD_SYS}/usr/bin/patchelf-uninative
+ tar ${SDKTAROPTS} -c --file=${SDK_DEPLOY}/${TOOLCHAIN_OUTPUTNAME}.tar.bz2 .