[OE-core] [RFC][PATCH 2/2] buildhistory: support generating md5sum of files

[Mikko.Rapeli at bmw.de]

On Mon, Jan 07, 2019 at 03:17:00PM +0100, Jacob Kroon wrote:
> On Sun, Jan 6, 2019 at 7:14 PM Jacob Kroon <jacob.kroon at gmail.com> wrote:
> >
> > Introduce 'md5' in BUILDHISTORY_FEATURES and enable it by default
> > when doing reproducible builds.
> >
> > When enabled this will additionally create:
> >
> >   files-in-package-md5.txt
> >   files-in-image-md5.txt
> >   files-in-sdk-md5.txt
> >
> > containing the md5 checksums of regular files.
> >
> > Signed-off-by: Jacob Kroon <jacob.kroon at gmail.com>
> > ---
> >  meta/classes/buildhistory.bbclass | 10 ++++++++--
> >  1 file changed, 8 insertions(+), 2 deletions(-)
> >
> > diff --git a/meta/classes/buildhistory.bbclass b/meta/classes/buildhistory.bbclass
> > index 33eb1b00f6..00f0701dec 100644
> > --- a/meta/classes/buildhistory.bbclass
> > +++ b/meta/classes/buildhistory.bbclass
> > @@ -7,7 +7,8 @@
> >  # Copyright (C) 2007-2011 Koen Kooi <koen at openembedded.org>
> >  #
> >
> > -BUILDHISTORY_FEATURES ?= "image package sdk"
> > +BUILDHISTORY_FEATURES ?= "image package sdk \
> > +  ${@ "md5" if bb.utils.to_boolean(d.getVar('BUILD_REPRODUCIBLE_BINARIES')) else ""}"
> >  BUILDHISTORY_DIR ?= "${TOPDIR}/buildhistory"
> >  BUILDHISTORY_DIR_IMAGE = "${BUILDHISTORY_DIR}/images/${MACHINE_ARCH}/${TCLIBC}/${IMAGE_BASENAME}"
> >  BUILDHISTORY_DIR_PACKAGE = "${BUILDHISTORY_DIR}/packages/${MULTIMACH_TARGET_SYS}/${PN}"
> > @@ -526,7 +527,12 @@ buildhistory_list_files() {
> >                 eval ${FAKEROOTENV} ${FAKEROOTCMD} $find_cmd
> >         else
> >                 eval $find_cmd
> > -       fi | sort -k5 | sed 's/ * -> $//' > $2 )
> > +       fi | sort -k5 | sed 's/ * -> $//' > $2
> > +       if [ "${@bb.utils.contains('BUILDHISTORY_FEATURES', 'md5', '1', '0', d)}" = "1" ] ; then
> > +               md5filename=$(echo $2 | sed 's/\.txt$/-md5.txt/')
> > +               find -type f | xargs -I{} -n1 md5sum {} | sort -k2 > $md5filename
> > +               [ -s $md5filename ] || rm $md5filename # remove result if empty
> 
> I added this remove because I thought it didn't make sense to keep
> empty files around, but I now realize that the "files-in-package.txt"
> file is kept around, even if empty. Is there a preference on what to
> do here ?

FWIW, I'm wiping the all buildhistory data with external scripts before doing a
clean build. Basically a "git rm -rf *" in buildhistory directory. Otherwise
stale data about images, packages etc which are no longer built remain in
buildhistory.

-Mikko