Am Dienstag, den 16.10.2018, 10:59 +0200 schrieb Michael Olbrich:
> On Fri, Oct 12, 2018 at 12:28:19PM +0000, Baeuerle, Florian wrote:
> > Am Freitag, den 12.10.2018, 14:01 +0200 schrieb Michael Olbrich:
> > > On Thu, Oct 11, 2018 at 02:19:17PM +0000, Baeuerle, Florian wrote:
> > > > Inject fake timestamps into the build via faketime to produce the exact
> > > > same binaries.
> > > >
> > > > Signed-off-by: Florian Bäuerle <florian.baeue...@allegion.com>
> > > > ---
> > > > platforms/barebox.in | 10 ++++++++++
> > > > rules/barebox.make | 16 +++++++++++++++-
> > > > 2 files changed, 25 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/platforms/barebox.in b/platforms/barebox.in
> > > > index 645366e93..5bc2f08b6 100644
> > > > --- a/platforms/barebox.in
> > > > +++ b/platforms/barebox.in
> > > > @@ -13,6 +13,7 @@ menuconfig BAREBOX
> > > > select HOST_OPENSSL if BAREBOX_NEEDS_HOST_OPENSSL
> > > > select HOST_IMX_CST if BAREBOX_NEEDS_HOST_IMX_CST
> > > > select HOST_LZOP if BAREBOX_NEEDS_HOST_LZOP
> > > > + select HOST_FAKETIME if BAREBOX_REPRODUCIBLE
> > > > prompt "barebox "
> > > > bool
> > > > help
> > > > @@ -50,6 +51,15 @@ config BAREBOX_EXTRA_ENV_PATH
> > > > Directories and files to add to the builtin barebox
> > > > environment.
> > > > Relative paths must be relative to the platformconfigdir.
> > > >
> > > > +config BAREBOX_REPRODUCIBLE
> > > > + prompt "build reproducibly"
> > > > + bool
> > > > + default n
> > > > + help
> > > > + With this, fake timestamps are injected to the barebox build,
> > > > so the
> > > > + resulting barebox images are identical when the sources
> > > > haven't been
> > > > + changed.
> > > > +
> > > > config BAREBOX_BAREBOXENV
> > > > prompt "install 'bareboxenv'"
> > > > bool
> > > > diff --git a/rules/barebox.make b/rules/barebox.make
> > > > index a6ec3c394..ad160b3ba 100644
> > > > --- a/rules/barebox.make
> > > > +++ b/rules/barebox.make
> > > > @@ -45,6 +45,20 @@ BAREBOX_ENV := \
> > > > KCONFIG_NOTIMESTAMP=1 \
> > > > pkg_wrapper_blacklist="$(BAREBOX_WRAPPER_BLACKLIST)"
> > > >
> > > > +ifdef PTXCONF_BAREBOX_REPRODUCIBLE
> > > > +BAREBOX_FAKE_TIMESTAMP := \
> > > > + $(shell echo $(BAREBOX_VERSION) | \
> > > > + sed -E "s/([0-9]{4})\.([0-9]{1,2}).*/\1-\2-01
> > > > 00:00:00/")
> > > > +BAREBOX_FAKETIME := faketime -f "$(BAREBOX_FAKE_TIMESTAMP)"
> > > > +BAREBOX_ENV := $(BAREBOX_ENV) \
> > > > + KBUILD_BUILD_TIMESTAMP="$(BAREBOX_FAKE_TIMESTAMP)" \
> > > > + KBUILD_BUILD_VERSION="0" \
> > > > + KBUILD_BUILD_USER="ptxdist" \
> > > > + KBUILD_BUILD_HOST="ptxdist"
> >
> > For the sake of completeness: the _USER and _HOST variables are *not yet*
> > incorporated into the resulting binaries by barebox (at least with my
> > configuration).
>
> Hmm, then something is wrong here. scripts/mkcompile_h has always used
> these variables.
Yes, it generates #defines, but apparently these are not used anywhere in the
barebox source tree, thus they do not end up in the binary.
>
> > > What is not covered by the KBUILD_BUILD_* variables? faketime is a big
> > > hammer that can cause other problems. I'd like to understand what happens
> > > here first.
> >
> > It's an opt-in hammer at least. One annoyance that I observed is, that
> > menuconfig barebox also does build host-faketime and a bunch of other things
> > that are not a dependency of the host-faketime package.
>
> That's the usual early build stuff, right? host-pkg-config and things like
> that.
>
I guess so. It's host-chrpath, host-pkg-config, kernel-header, host-attr, host-
autotools-*, host-acl, host-fakeroot, host-m4 to name a few.
- Florian
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