scute / firefox: cannot connect to GPG agent

[Fabian Peter Hammerle]

I just cloned Scute from git://git.gnupg.org/scute.git
(commit 10a19467bc2a95b4aa91176924a91be427d3157a)

The error messages changed (compared to my initial mail):

$ GPG_AGENT_INFO=$(gpgconf --list-dir agent-socket):0:1 firefox
> scdaemon[2999]: detected reader 'Yubico Yubikey 4 OTP+U2F+CCID 00 00'
> gpg-agent[2998]: card has S/N: D276000[...]
> scdaemon[2999]: detected reader 'Yubico Yubikey 4 OTP+U2F+CCID 00 00'
> scdaemon[2999]: pcsc_connect failed: sharing violation (0x8010000b)
> gpg-agent[2998]: card has S/N: D276000[...]
> scdaemon[2999]: detected reader 'Yubico Yubikey 4 OTP+U2F+CCID 00 00'
> scdaemon[2999]: detected reader ''
> scdaemon[2999]: pcsc_connect failed: sharing violation (0x8010000b)
> gpg-agent[2998]: card has S/N: D276000[...]
> scdaemon[2999]: detected reader 'Yubico Yubikey 4 OTP+U2F+CCID 00 00'
> scdaemon[2999]: detected reader ''
> scdaemon[2999]: pcsc_connect failed: sharing violation (0x8010000b)
[repeating rapidly]

pcscd reports:
> pcscd[3001]: 01000753 winscard.c:284:SCardConnect() Error Reader Exclusive

As far as I know, only gnupg accesses my smartcard.

Decryption, signing, and ssh authentication work as usual.

Restarting gpg-agent, scdaemon, pcscd and rebooting did not change anything.

Does anyone know what might cause the 'sharing violation' error?

Fabian
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