Andrew Ayer 8ba75c4719 Don't encrypt empty files in new repositories ...

git has several problems with using smudge/clean filters
on empty files (see issue #53).  The easiest fix is to
just not encrypt empty files. Since it was already obvious
from the encrypted file length that a file was empty, skipping
empty files does not decrease security.

Since skipping empty files is a breaking change to the
git-crypt file format, we only do this on new repositories.
Specifically, we add a new critical header field to the key
file called skip_empty which is set in new keys.  We
skip empty files if and only if this field is present.

Closes: #53
Closes: #162

2020-07-29 08:57:22 -04:00

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