[pkg-gnupg-maint] Bug#904596: gpg: Using gpg --edit-card with different --homedir breaks capability to read a Yubikey 4

[Jose M Calhariz]

Package: gpg
Version: 2.2.9-1
Severity: normal

I am playing with a yubikey 4.  For doing experiments I started using
gpg from stretch with --homedir poiting to others paths, so I would
not change my keys in ~/.gnupg.  Just found that if I read my Yubikey
with one --homedir I could not read it in another homedir.  Upgraded
gpg to version from buster and the problem still persist.

This feature is important for new users with yubikeys and similars,
where is important to play with GPG and the SmarCard until get the
desired result.

Kind Regards
Jose M Calhariz

-- System Information:
Debian Release: 9.5
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-7-amd64 (SMP w/4 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=UTF-8) (ignored: LC_ALL set to en_GB.UTF-8), LANGUAGE=C (charmap=UTF-8) (ignored: LC_ALL set to en_GB.UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gpg depends on:
ii  gpgconf        2.2.9-1
ii  libassuan0     2.5.1-2
ii  libbz2-1.0     1.0.6-8.1
ii  libc6          2.24-11+deb9u3
ii  libgcrypt20    1.8.3-1
ii  libgpg-error0  1.26-2
ii  libreadline7   7.0-3
ii  libsqlite3-0   3.16.2-5+deb9u1
ii  zlib1g         1:1.2.8.dfsg-5

Versions of packages gpg recommends:
ii  gnupg  2.2.9-1

gpg suggests no packages.

-- no debconf information