[pkg-gnupg-maint] Bug#854376: gnupg-agent: Broken with systemd

[Mark Brown]

Package: gnupg-agent
Version: 2.1.18-4
Severity: important

I've got:

  SSH_AUTH_SOCK=/run/user/1000/gnupg/S.gpg-agent

(this is manually forced since gnome-keyring appears to be managing to
force itself as the SSH agent, I've filed a separate bug about that).
When I try to list keys I get:

   $ ssh-add -L
   error fetching identities for protocol 2: invalid format
   The agent has no identities.

Similarly attempting to SSH result in:

   debug1: pubkey_prepare: ssh_fetch_identitylist: invalid format

in the SSH verbose output.  If I manually disable all the systemd based
activation and start gpg-agent from the command line with --daemon then
the problem is resolved and I can happily authenticate.

Severity important since this is preventing me logging into remote
systems (including in my case kernel.org which is preventing me doing
upstream kernel work right now).

-- System Information:
Debian Release: 9.0
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gnupg-agent depends on:
ii  libassuan0                  2.4.3-2
ii  libc6                       2.24-9
ii  libgcrypt20                 1.7.6-1
ii  libgpg-error0               1.26-2
ii  libnpth0                    1.3-1
ii  libreadline7                7.0-2
ii  pinentry-gnome3 [pinentry]  1.0.0-1
ii  pinentry-gtk2 [pinentry]    1.0.0-1

Versions of packages gnupg-agent recommends:
ii  gnupg  2.1.18-4

Versions of packages gnupg-agent suggests:
ii  dbus-user-session  1.10.14-1
ii  libpam-systemd     232-15
ii  pinentry-gnome3    1.0.0-1
ii  scdaemon           2.1.18-4

-- no debconf information