[Reproducible-builds] Bug#774274: fontforge: please allow scripts to set the font modification time

[Jérémy Bobbio]

Jérémy Bobbio:
> For font compilation to be deterministic, we need a way to set the font
> modification time to a defined value instead of the current time.
> 
> We thus add a new function “SetModificationTime” to the scripting language.
> It takes a single string argument looking like “2014-12-30 21:18:33”.

Now that we have SOURCE_DATE_EPOCH defined [1], I wonder if this is the
right approach. Just looking for the variable in the environment and
using it as the font modification time sounds an easier approach to
implement and to make many Debian packages reproducible without any
modifications.

 [1]: https://wiki.debian.org/ReproducibleBuilds/TimestampsProposal

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