gpg-agent 2.3.2 conflicts with pcscd
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	cwittlut
	Oct 1 2021, 11:01 AM

Description

environment: gentoo linux, openrc
when I read the yubikey card status with gpg 2.3.2, error occures:

 ~ › gpg --card-status
gpg: selecting card failed: No such device
gpg: OpenPGP card not available: No such device

debug scd, and this is the log:

…
…
2021-09-30 19:57:41 scdaemon[13375] DBG: ccid-driver:   wlcdLayout           none
2021-09-30 19:57:41 scdaemon[13375] DBG: ccid-driver:   bPINSupport             0 
2021-09-30 19:57:41 scdaemon[13375] DBG: ccid-driver:   bMaxCCIDBusySlots       1
2021-09-30 19:57:41 scdaemon[13375] DBG: ccid-driver: usb_claim_interface failed: -6
2021-09-30 19:57:41 scdaemon[13375] ccid open error: skip
…

I check the libusb code here, and it seems to be in conflict with pcscd. gpg 2.3.2 works fine if pcscd stoped.

Version 2.2.29 has the same problem but 2.2.29 will fallback to use PC/SC driver instead. ( The pcscd is the dependence of yubikey-manager for OTP feature, I have to use it. )

Full debug logs with the following scdaemon.conf are here: scd.log , gpg --debug ipc --card-status

debug-all
debug-level guru
log-file /tmp/scd.log
debug-ccid-driver
verbose
verbose
verbose

I can use gpg 2.3.2 normally by adding disable-ccid to scdaemon.conf, however I am not sure if this is a bug or the design is the way it is, so I post it here.

And, gpg 2.3.2 cannot show the correct version by gpg --card-status, it's always 0.0 whether it uses ccid-driver or PC/SC.