generate.py: don't skip files with mtime = 0 #78
Merged
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TL;DR:
'generate.py' fails to generate tests on file with mtime=0:
Long story:
Error happens because 'generate.py' uses '0' as a sentinel value.
In order to enhance reproducibility of builds some build systems
timestamps to a stable date (say, release tarball date).
https://www.gnu.org/software/guix/ goes even farther that that
and sets mtime to '0'. Unfortunately it is exactly the same as
sentinel value in 'generate.py'. That causes 'generate.py' to
treat all test files as "already read".
The change changes value to 'None'.
Signed-off-by: Sergei Trofimovich slyfox@gentoo.org