gitcrypt (0.3.0, 0.3.1, 0.3.2) did not work with git v2.2.x

[hoatle]

I checked with the following git versions:

git v1.9.5: ok
git v2.0.0: ok
git v2.0.5: ok
git v2.1.4: ok

git v2.2.0, v2.2.1, v2.2.2: NOT ok

I checked with git-encrypt v0.3.0, v0.3.1 and v0.3.2, the problem was the same.

Steps to reproduce:

vagrant@vagrant:~/workspace/personal$ git --version
git version 2.2.0
vagrant@vagrant:~/workspace/personal$ gitcrypt version
gitcrypt version 0.3.0
vagrant@vagrant:~/workspace/personal$ mkdir test
vagrant@vagrant:~/workspace/personal$ cd test/
vagrant@vagrant:~/workspace/personal/test$ git init
Initialized empty Git repository in /home/vagrant/workspace/personal/test/.git/
vagrant@vagrant:~/workspace/personal/test$ touch README.md
vagrant@vagrant:~/workspace/personal/test$ gitcrypt init
Generate a random salt? [Y/n] 
Generate a random password? [Y/n]n
Enter your passphrase: 123456
What encryption cipher do you want to use? [aes-256-ecb] 

This configuration will be stored:

salt:   1f144788937c915a
pass:   123456
cipher: aes-256-ecb

Does this look right? [Y/n] 
Do you want to use .git/info/attributes? [Y/n] n
What files do you want encrypted? [*] 
vagrant@vagrant:~/workspace/personal/test$ git status
On branch master

Initial commit

Untracked files:
  (use "git add <file>..." to include in what will be committed)

    .gitattributes
    README.md

nothing added to commit but untracked files present (use "git add" to track)
vagrant@vagrant:~/workspace/personal/test$ git add .
error: copy-fd: read returned Bad file descriptor
error: cannot feed the input to external filter gitcrypt clean
error: external filter gitcrypt clean failed

as we could see, when I $ git add, we got the following messages:

error: copy-fd: read returned Bad file descriptor
error: cannot feed the input to external filter gitcrypt clean
error: external filter gitcrypt clean failed

So before a fix for this is updated, we will need to use the working git versions tested above.