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| author |   Bruce Ashfield <bruce.ashfield@gmail.com> | 2020-05-13 10:24:35 -0400 |
|---|---|---|
| committer |   Richard Purdie <richard.purdie@linuxfoundation.org> | 2020-05-15 16:24:15 +0100 |
| commit | 82cdfcdccfedd320ebc0cdc778c7d4966198b96f (patch) | |
| tree | 35532e6e6eb9dbf076882cc0921d677094871c0b /meta/classes/kernel.bbclass | |
| parent | d2fdd473db5446b0e96ad4f774121129fbf94e0e (diff) | |
| download | openembedded-core-contrib-82cdfcdccfedd320ebc0cdc778c7d4966198b96f.tar.gz | |
kernel/reproducibility: kernel modules need SOURCE_DATE_EPOCH export
If CONFIG_IKHEADERS is set to =m, then reproducibility issues creep
into the modules build, since the variables we are setting for the
main kernel build are not present.
Since the source code must be available for a possibly git query
on the timestamp, there didn't seem to be an easy way to move the
environment variable setting to a common routine. As such, we
duplicate the block of code that exports the required variables for
reproducible builds. There is a maintenance risk to this, but any
issues should be easy enough to catch.
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'meta/classes/kernel.bbclass')
| -rw-r--r-- | meta/classes/kernel.bbclass | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass index 6846d6040d..0935196f6f 100644 --- a/meta/classes/kernel.bbclass +++ b/meta/classes/kernel.bbclass @@ -331,6 +331,21 @@ kernel_do_compile() { do_compile_kernelmodules() { unset CFLAGS CPPFLAGS CXXFLAGS LDFLAGS MACHINE + if [ "${BUILD_REPRODUCIBLE_BINARIES}" = "1" ]; then + # kernel sources do not use do_unpack, so SOURCE_DATE_EPOCH may not + # be set.... + if [ "${SOURCE_DATE_EPOCH}" = "" -o "${SOURCE_DATE_EPOCH}" = "0" ]; then + # The source directory is not necessarily a git repository, so we + # specify the git-dir to ensure that git does not query a + # repository in any parent directory. + SOURCE_DATE_EPOCH=`git --git-dir="${S}/.git" log -1 --pretty=%ct 2>/dev/null || echo "${REPRODUCIBLE_TIMESTAMP_ROOTFS}"` + fi + + ts=`LC_ALL=C date -d @$SOURCE_DATE_EPOCH` + export KBUILD_BUILD_TIMESTAMP="$ts" + export KCONFIG_NOTIMESTAMP=1 + bbnote "KBUILD_BUILD_TIMESTAMP: $ts" + fi if (grep -q -i -e '^CONFIG_MODULES=y$' ${B}/.config); then cc_extra=$(get_cc_option) oe_runmake -C ${B} ${PARALLEL_MAKE} modules CC="${KERNEL_CC} $cc_extra " LD="${KERNEL_LD}" ${KERNEL_EXTRA_ARGS} |