Using gpg and gitattributes together

Hi,

I just added my .netrc to a repository where I track some files that I 
would hate to lose.  However, since I mirror that repository to a machine 
where other people than me have root access, I thought that I encrypt the 
file with gpg.

To make this procedure more convenient for me, I decided not to encrypt 
with a private key, but with a passphrase, and to use gitattributes to do 
the encryption for me:

$ echo 'netrc filter=gpg' > .gitattributes
$ git config filter.gpg.clean 'gpg --cipher-algo AES256 -c'
$ git config filter.gpg.smudge 'gpg --decrypt'
$ git add netrc

It asks quite a few times for the passphrase (as expected), but I had to 
add the file twice (not expected).  However, since it worked now, I am 
happy.

Maybe somebody else will find this information useful.

Ciao,
Dscho