[Mesa-dev] [PATCHv5 2/4] anv: use cache uuid based on the build timestamp.

[Jason Ekstrand]

I think this patch finally looks good.  I read the SOURCE_DATE_EPOCH spec
and we seem to be following it correctly.  Thanks for all your hard work (I
know it's been a lot) on this!

Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>

On Fri, Jul 1, 2016 at 9:22 AM, Emil Velikov <emil.l.velikov at gmail.com>
wrote:

> From: Emil Velikov <emil.velikov at collabora.com>
>
> Do not rely on the git sha1:
>  - its current truncated form makes it less unique
>  - it does not attribute for local (Vulkand or otherwise) changes
>
> Use a timestamp produced at the time of build. It's perfectly unique,
> unless someone explicitly thinkers with their system clock. Even then
> chances of producing the exact same one are very small, if not zero.
>
> v2: Remove .tmp rule. Its not needed since we want for the header to be
> regenerated on each time we call make (Eric).
>
> v3:
>  - Honour SOURCE_DATE_EPOCH, to make the build reproducible (Michel)
>  - Replace the generated header with a define, to prevent needless
> builds on consecutive `make' and/or `make install' calls. (Dave)
>
> v4:
>  - Keep the timestamp generation at make time. (Jason)
>
> v5:
>  - Ensure that file is regenerated on incremental builds.
>
> Cc: mesa-stable at lists.freedesktop.org
> Signed-off-by: Emil Velikov <emil.velikov at collabora.com>
> ---
>  configure.ac                  |  2 ++
>  src/intel/vulkan/Makefile.am  | 10 +++++++++-
>  src/intel/vulkan/anv_device.c |  4 ++--
>  3 files changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/configure.ac b/configure.ac
> index 8321e8e..3d32c53 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -2620,6 +2620,8 @@ AC_SUBST([XA_MINOR], $XA_MINOR)
>  AC_SUBST([XA_TINY], $XA_TINY)
>  AC_SUBST([XA_VERSION], "$XA_MAJOR.$XA_MINOR.$XA_TINY")
>
> +AC_SUBST([TIMESTAMP_CMD], '`test $(SOURCE_DATE_EPOCH) && echo
> $(SOURCE_DATE_EPOCH) || date +%s`')
> +
>  AC_ARG_ENABLE(valgrind,
>                [AS_HELP_STRING([--enable-valgrind],
>                               [Build mesa with valgrind support (default:
> auto)])],
> diff --git a/src/intel/vulkan/Makefile.am b/src/intel/vulkan/Makefile.am
> index 4d9ff90..3f49020 100644
> --- a/src/intel/vulkan/Makefile.am
> +++ b/src/intel/vulkan/Makefile.am
> @@ -131,8 +131,16 @@ anv_entrypoints.c : anv_entrypoints_gen.py
> $(vulkan_include_HEADERS)
>         $(AM_V_GEN) cat $(vulkan_include_HEADERS) |\
>         $(PYTHON2) $(srcdir)/anv_entrypoints_gen.py code > $@
>
> +.PHONY: anv_timestamp.h
> +
> +anv_timestamp.h:
> +       @echo "Updating anv_timestamp.h"
> +       $(AM_V_GEN) echo "#define ANV_TIMESTAMP \"$(TIMESTAMP_CMD)\"" > $@
> +
> +anv_device.$(OBJEXT): anv_timestamp.h
> +
>  BUILT_SOURCES = $(VULKAN_GENERATED_FILES)
> -CLEANFILES = $(BUILT_SOURCES) dev_icd.json
> +CLEANFILES = $(BUILT_SOURCES) dev_icd.json anv_timestamp.h
>  EXTRA_DIST = \
>         $(top_srcdir)/include/vulkan/vk_icd.h \
>         anv_entrypoints_gen.py \
> diff --git a/src/intel/vulkan/anv_device.c b/src/intel/vulkan/anv_device.c
> index ea8e875..dd941b6 100644
> --- a/src/intel/vulkan/anv_device.c
> +++ b/src/intel/vulkan/anv_device.c
> @@ -28,7 +28,7 @@
>  #include <fcntl.h>
>
>  #include "anv_private.h"
> -#include "git_sha1.h"
> +#include "anv_timestamp.h"
>  #include "util/strtod.h"
>  #include "util/debug.h"
>
> @@ -426,7 +426,7 @@ void
>  anv_device_get_cache_uuid(void *uuid)
>  {
>     memset(uuid, 0, VK_UUID_SIZE);
> -   snprintf(uuid, VK_UUID_SIZE, "anv-%s", MESA_GIT_SHA1 + 4);
> +   snprintf(uuid, VK_UUID_SIZE, "anv-%s", ANV_TIMESTAMP);
>  }
>
>  void anv_GetPhysicalDeviceProperties(
> --
> 2.8.2
>
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