A: An Emacs command requiring a GnuPG passphrase, such as signing a commit in Magit mode, can fail in a graphical environment if Emacs becomes detached from the terminal and is virtually impossible when running Emacs in terminal mode due to I/O contention. A better solution is to have Emacs prompt for the passphrase in a minibuffer.
To enable this, add to the file ~/.gnupg/gpg.conf a line:
pinentry-mode loopback
and to ~/.gnupg/gpg-agent.conf a line:
allow-loopback-pinentry
Now, reload gpg-agent:
gpgconf --reload gpg-agent
Finally, restart Emacs. That's it!
A: On macOS, after switching to another user ID via sudo,
emacsclient might fail with an error such as:
Connection refused
This can be caused by the environment variable TMPDIR not being
defined. In particular, TMPDIR must be set prior to running
Emacs in daemon mode. See the file ./contrib/set-tmpdir for a
solution.
A: If logged in via multiple virtual/pseudo terminals, then the file
may be opened in the first terminal from which em was invoked.
To be able to edit in each virtual terminal separately, invoke
em with the emacsclient option -s and an option argument
uniquely corresponding to each virtual terminal.
In tty /dev/ttyv1, for instance, em might be invoked (and
always thereafter) as:
em -s v1 [...]while in tty /dev/ttyv2 em might be invoked (and always
thereafter) as:
em -s v2 [...]NB: The em script attempts to set a unique server name as appropriate
for console-based I/O in the function set-for-console.