### Please describe the problem.
when attempting to create a glacier special remote one of the gpg sub-commands hangs without returning.

### What steps will reproduce the problem?
I'm not sure what will reproduce this issue. I recently upgraded from the apt-get version of git-annex (version 3) to the cabal version (version 4 shown below), but I'm not sure if that is relevant at all).

### What version of git-annex are you using? On what operating system?

git version: 1.7.9.5

(git annex was installed using cabal)
[[!format sh """
$> git-annex version
git-annex version: 4.20130709
build flags: Testsuite S3 Inotify DBus
local repository version: 3
default repository version: 3
supported repository versions: 3 4
upgrade supported from repository versions: 0 1 2
"""]]

OS version:

12.04.2 LTS, Precise Pangolin

GPG version:

[[!format sh """
$> gpg --version
gpg (GnuPG) 1.4.11
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Home: ~/.gnupg
Supported algorithms:
Pubkey: RSA, RSA-E, RSA-S, ELG-E, DSA
Cipher: 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH, CAMELLIA128,
        CAMELLIA192, CAMELLIA256
Hash: MD5, SHA1, RIPEMD160, SHA256, SHA384, SHA512, SHA224
Compression: Uncompressed, ZIP, ZLIB, BZIP2
"""]]

### Please provide any additional information below.

[[!format sh """
# If you can, paste a complete transcript of the problem occurring here.
# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log

$> git annex initremote glacier type=glacier encryption=annex-l1@ggg.local embedcreds=yes vault=some-vault-name --verbose --debug
[2013-07-20 22:45:13 MDT] read: git ["--git-dir=/home/cantora/annex-l1/.git","--work-tree=/home/cantora/annex-l1","show-ref","git-annex"]
[2013-07-20 22:45:13 MDT] read: git ["--git-dir=/home/cantora/annex-l1/.git","--work-tree=/home/cantora/annex-l1","show-ref","--hash","refs/heads/git-annex"]
[2013-07-20 22:45:13 MDT] read: git ["--git-dir=/home/cantora/annex-l1/.git","--work-tree=/home/cantora/annex-l1","log","refs/heads/git-annex..181aa86dfd264557ab73285220d70c67f868b349","--oneline","-n1"]
[2013-07-20 22:45:13 MDT] read: git ["--git-dir=/home/cantora/annex-l1/.git","--work-tree=/home/cantora/annex-l1","log","refs/heads/git-annex..1dc6e1c4bca2102fc25e86491ab89338750ee1f6","--oneline","-n1"]
[2013-07-20 22:45:13 MDT] read: git ["--git-dir=/home/cantora/annex-l1/.git","--work-tree=/home/cantora/annex-l1","log","refs/heads/git-annex..b919b83cafeff420d23af24ff7de35b4ff955c8c","--oneline","-n1"]
[2013-07-20 22:45:13 MDT] chat: git ["--git-dir=/home/cantora/annex-l1/.git","--work-tree=/home/cantora/annex-l1","cat-file","--batch"]
[2013-07-20 22:45:13 MDT] read: git ["config","--null","--list"]
initremote glacier (encryption setup) [2013-07-20 22:45:13 MDT] read: gpg ["--batch","--no-tty","--use-agent","--quiet","--trust-model","always","--with-colons","--list-public-keys","annex-l1@ggg.local"]
[2013-07-20 22:45:13 MDT] read: gpg ["--batch","--no-tty","--use-agent","--quiet","--trust-model","always","--gen-random","--armor","2","512"]
[2013-07-20 22:47:37 MDT] chat: gpg ["--batch","--no-tty","--use-agent","--quiet","--trust-model","always","--encrypt","--no-encrypt-to","--no-default-recipient","--recipient","DF31708872834ABA"]
(with gpg key DF31708872834ABA) [2013-07-20 22:47:37 MDT] call: glacier ["--region=us-east-1","vault","create","some-vault-name"]
[2013-07-20 22:47:38 MDT] call: git ["--git-dir=/home/cantora/annex-l1/.git","--work-tree=/home/cantora/annex-l1","config","remote.glacier.annex-glacier","true"]
[2013-07-20 22:47:38 MDT] call: git ["--git-dir=/home/cantora/annex-l1/.git","--work-tree=/home/cantora/annex-l1","config","remote.glacier.annex-uuid","a9739087-7860-4ed0-bc38-0b6031b1afd3"]
(gpg) [2013-07-20 22:47:38 MDT] chat: gpg ["--batch","--no-tty","--use-agent","--quiet","--trust-model","always","--decrypt"]
[2013-07-20 22:47:38 MDT] chat: gpg ["--batch","--no-tty","--use-agent","--quiet","--trust-model","always","--batch","--passphrase-fd","3","--symmetric","--force-mdc"]
#at this point it simply waits forever. not sure what it's waiting for, stdin maybe? maybe fd 3 is empty??

#[on a different terminal]
$> ps ax | grep gpg | grep -v ssh
 2024 ?        Ss     0:00 /usr/bin/gpg-agent --daemon --sh --write-env-file=/home/cantora/.gnupg/gpg-agent-info-ggg /usr/bin/dbus-launch --exit-with-session gnome-session --session=ubuntu
 8341 pts/4    SL+    0:00 gpg --batch --no-tty --use-agent --quiet --trust-model always --batch --passphrase-fd 3 --symmetric --force-mdc
 8652 pts/5    S+     0:00 grep --color=auto gpg

# End of transcript or log.
"""]]