Implement support for SOURCE_DATE_EPOCH environment variable

reproducible-builds.org suggests the use of an environment variable
as a source for time stamps:

https://reproducible-builds.org/specs/source-date-epoch/

This commit adds support for setting the default mtime from the variable,
if it is set and only defaulting to 0 if not. The timestamp given by the
command line switch takes precedence.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

0 files changed, 0 insertions, 0 deletions