This new field allows specification of an fd on which the password
prompt logic will look for POLLHUP events for, and if seen will abort
the query.
The usecase for this is that when we query for a pw on behalf of a
Varlink client we can abort the query automatically if the client dies.
The values that were previously hardcoded in sd-varlink.c are now defined
in new varlink_set_info_systemd() and that function is called everywhere
where we create a server.
The bootspec util-lib's handling of global addons didn't previously
match the behavior of sd-stub, and this commit corrects that.
First, bootspec didn't load global addons from the XBOOTLDR dir, but the
stub does. So, bootspec now enumerates addons in XBOOTLDR, not just ESP
Second, the stub only loads resources (including addons) from the
partition that it was found on. Thus, we must keep track of which
partition the global addons come from, and which partition each boot
entry comes from. In other words: global addons found on the ESP will
NOT apply to UKIs found in XBOOTLDR, and bootspec now reflects that.
systemd-boot uses the existance of loader/keys/auto to determine
whether to auto-enroll secure boot or not so only create the directory
if we're actually going to put auto-enroll signature lists in it.
This allows loading the X.509 certificate from an OpenSSL provider
instead of a file system path. This allows loading certficates directly
from hardware tokens instead of having to export them to a file on
disk first.
