Thanks. fixing a typo and then merged. On Wed, May 16, 2018 at 5:13 AM, Chris Lamb <lamby@xxxxxxxxxx> wrote: > Hi Akira, > >> Please mention about SOURCE_DATE_EPOCH at the section of the >> Environment variables in doc/fontconfig-user.sgml > > Whoops, I somehow forgot this bit. Updated patch attached: > > commit 9213848ca27ccc3587a1a60539ec7c02fb02016f > Author: Chris Lamb <chris@xxxxxxxxxxxxxxxx> > Date: Tue May 15 22:11:24 2018 +0200 > > Ensure cache checksums are deterministic > > Whilst working on the Reproducible Builds[0] effort, we noticed that > fontconfig generates unreproducible cache files. > > This is due to fc-cache uses the modification timestamps of each > directory in the "checksum" and "checksum_nano" members of the _FcCache > struct. This is so that it can identify which cache files are valid > and/or require regeneration. > > This patch changes the behaviour of the checksum calculations to prefer > the value of the SOURCE_DATE_EPOCH[1] environment variable over the > directory's own mtime. This variable can then be exported by build > systems to ensure reproducible output. > > If SOURCE_DATE_EPOCH is not set or is newer than the mtime of the > directory, the existing behaviour is unchanged. > > This work was sponsored by Tails[2]. > > [0] https://reproducible-builds.org/ > [1] https://reproducible-builds.org/specs/source-date-epoch/ > [2] https://tails.boum.org/ > > doc/fontconfig-user.sgml | 6 ++++- > src/fccache.c | 58 +++++++++++++++++++++++++++++++++++++++++++----- > 2 files changed, 57 insertions(+), 7 deletions(-) > > > You can also merge from the "864082-FcConfigGetFontDirs" branch of > https://github.com/lamby/fontconfig if that is more convenient. > > > Best wishes, > > -- > ,''`. > : :' : Chris Lamb > `. `'` lamby@xxxxxxxxxx / chris-lamb.co.uk > `- -- Akira TAGOH _______________________________________________ Fontconfig mailing list Fontconfig@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/fontconfig
