create reproducible tarballs #540
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tar's default pax/posix format stores ctime and atime that vary. ustar format works everywhere and creates more reproducible output. gzip --no-name causes it to not store a 4-byte UNIX timestamp in .gz header
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tar's default pax/posix format stores ctime and atime that vary across builds.
ustar format works everywhere and creates more reproducible output.
gzip --no-name causes it to not store a 4-byte UNIX timestamp in .gz header (actually it stores 0)