[U-Boot] [PATCH v3 2/2] Makefile: Add SOURCE_DATE_TZ

[Paul Kocialkowski <contact@paulk.fr>]

Le mercredi 26 ao?t 2015 ? 21:08 +1200, Chris Packham a ?crit :
> On Wed, Aug 26, 2015 at 12:09 AM, Paul Kocialkowski <contact@paulk.fr> wrote:
> > Le jeudi 13 ao?t 2015 ? 18:08 +1200, Chris Packham a ?crit :
> >> Along with SOURCE_DATE_EPOCH SOURCE_DATE_TZ can be used to recreate a
> >> build with a specific date timestamp. This allows the verification of
> >> source supplied with a pre-compiled binary.
> >>
> >> If SOURCE_DATE_EPOCH is supplied SOURCE_DATE_TZ can be used to specify
> >> what will appear in the output of the version command. If SOURCE_DATE_TZ
> >> is not specified UTC will be used.  SOURCE_DATE_TZ on it's own will not
> >> have an affect.
> >
> > I advise against merging this patch given Ximin Luo's comments on v1, at
> > least until this has been properly discussed with the reproducible team
> > and a precise meaning for it has been agreed on.
> >
> 
> I'm happy to go along with that. 1/2 of this series was the "fix". 2/2
> just kind of came up as part of the discussion that followed. Tom, can
> you handle that or do you want me to send a v4 of the series with just
> the first patch?
> 
> Just for my own understanding is the "reproducible team" a u-boot
> thing or a debian thing? I'm not really active in any of the debian
> projects so maybe someone there should pick this up if it's a debian
> thing.

Well, I'm referring to the reproducible team at Debian, but since
they're working with upstream (and they're apparently the only group of
people to do that work), I think it's fair to say they're the reference
when it comes to reproducible builds.

> >> Signed-off-by: Chris Packham <judge.packham@gmail.com>
> >> ---
> >> This is a quick proof of concept that allows some control of how the
> >> timezone is displayed. Now you can do something like
> >>
> >>   make SOURCE_DATE_EPOCH=12345678 SOURCE_DATE_TZ=America/Los_Angeles
> >>
> >>
> >> Changes in v3:
> >> - Drop RFC
> >>
> >> Changes in v2: None
> >>
> >>  Makefile | 7 ++++---
> >>  README   | 9 ++++++---
> >>  2 files changed, 10 insertions(+), 6 deletions(-)
> >>
> >> diff --git a/Makefile b/Makefile
> >> index 3ff063a..609b595 100644
> >> --- a/Makefile
> >> +++ b/Makefile
> >> @@ -1281,9 +1281,10 @@ endef
> >>  define filechk_timestamp.h
> >>       (if test -n "$${SOURCE_DATE_EPOCH}"; then \
> >>               SOURCE_DATE="@$${SOURCE_DATE_EPOCH}"; \
> >> -             LC_ALL=C date -u -d "$${SOURCE_DATE}" +'#define U_BOOT_DATE "%b %d %C%y"'; \
> >> -             LC_ALL=C date -u -d "$${SOURCE_DATE}" +'#define U_BOOT_TIME "%T"'; \
> >> -             LC_ALL=C date -u -d "$${SOURCE_DATE}" +'#define U_BOOT_TZ "%z"'; \
> >> +             SOURCE_TZ="$${SOURCE_DATE_TZ:-UTC}"; \
> >> +             TZ="$${SOURCE_TZ}" LC_ALL=C date -d "$${SOURCE_DATE}" +'#define U_BOOT_DATE "%b %d %C%y"'; \
> >> +             TZ="$${SOURCE_TZ}" LC_ALL=C date -d "$${SOURCE_DATE}" +'#define U_BOOT_TIME "%T"'; \
> >> +             TZ="$${SOURCE_TZ}" LC_ALL=C date -d "$${SOURCE_DATE}" +'#define U_BOOT_TZ "%z"'; \
> >>       else \
> >>               LC_ALL=C date +'#define U_BOOT_DATE "%b %d %C%y"'; \
> >>               LC_ALL=C date +'#define U_BOOT_TIME "%T"'; \
> >> diff --git a/README b/README
> >> index 1bcb63c..d2e3e94 100644
> >> --- a/README
> >> +++ b/README
> >> @@ -5087,11 +5087,14 @@ Reproducible builds
> >>  In order to achieve reproducible builds, timestamps used in the U-Boot build
> >>  process have to be set to a fixed value.
> >>
> >> -This is done using the SOURCE_DATE_EPOCH environment variable.
> >> -SOURCE_DATE_EPOCH is to be set on the build host's shell, not as a configuration
> >> -option for U-Boot or an environment variable in U-Boot.
> >> +This is done using the SOURCE_DATE_EPOCH and SOURCE_DATE_TZ environment
> >> +variables. These are to be set on the build host's shell, not as a
> >> +configuration option for U-Boot or an environment variable in U-Boot.
> >>
> >>  SOURCE_DATE_EPOCH should be set to a number of seconds since the epoch, in UTC.
> >> +SOURCE_DATE_TZ will default to UTC but can be set to another timezone and is
> >> +used to determine how the date is displayed (tzselect(1) can be used to
> >> +determine an appropriate value).
> >>
> >>  Building the Software:
> >>  ======================
> >

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