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Zbigniew Jędrzejewski-Szmek 60e4fb4240 hostnamed,shared/hostname-setup: expose the origin of the current hostname 
In hostnamed this is exposed as a dbus property, and in the logs in both
places.

This is of interest to network management software and such: if the fallback
hostname is used, it's not as useful as the real configured thing. Right now
various programs try to guess the source of hostname by looking at the string.
E.g. "localhost" is assumed to be not the real hostname, but "fedora" is. Any
such attempts are bound to fail, because we cannot distinguish "fedora" (a
fallback value set by a distro), from "fedora" (received from reverse dns),
from "fedora" read from /etc/hostname.

/run/systemd/fallback-hostname is written with the fallback hostname when
either pid1 or hostnamed sets the kernel hostname to the fallback value. Why
remember the fallback value and not the transient hostname in /run/hostname
instead?
We have three hostname types: "static", "transient", fallback".
– Distinguishing "static" is easy: the hostname that is set matches what
  is in /etc/hostname.
– Distingiushing "transient" and "fallback" is not easy. And the
  "transient" hostname may be set outside of pid1+hostnamed. In particular,
  it may be set by container manager, some non-systemd tool in the initramfs,
  or even by a direct call. All those mechanisms count as "transient". Trying
  to get those cases to write /run/hostname is futile. It is much easier to
  isolate the "fallback" case which is mostly under our control.
And since the file is only used as a flag to mark the hostname as fallback,
it can be hidden inside of our /run/systemd directory.

For https://bugzilla.redhat.com/show_bug.cgi?id=1892235.
 		2020-12-16 11:03:36 +01:00
..
ac-power license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
activate license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
analyze license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
ask-password license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
backlight backlight: add several debug logs and adjust log level of non critical error 2020-11-23 14:35:14 +01:00
basic hostnamed,shared/hostname-setup: expose the origin of the current hostname 2020-12-16 11:03:36 +01:00
binfmt license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
boot efi: Only use arm flags if supported 2020-12-15 12:06:52 +09:00
busctl Merge pull request #17967 from poettering/connect-user-bus 2020-12-15 21:14:01 +01:00
cgls license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
cgroups-agent license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
cgtop license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
core shared/hostname-setup: add mode where we check what would be set, without doing 2020-12-16 11:02:17 +01:00
coredump coredumpctl: Add --debugger-args= option 2020-12-16 12:42:53 +09:00
cryptsetup cryptsetup: give command line parameters proper names 2020-12-04 17:49:34 +01:00
debug-generator license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
delta license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
detect-virt license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
dissect license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
environment-d-generator license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
escape license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
firstboot firstboot: clean-up the copied hostname, not argv[] directly, as that's ugly 2020-12-15 18:00:02 +01:00
fsck license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
fstab-generator license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
fuzz Move hostname setup logic to new shared/hostname-setup.[ch] 2020-12-16 11:02:15 +01:00
getty-generator license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
gpt-auto-generator license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
hibernate-resume license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
home tree-wide: fix typo 2020-12-14 12:05:55 +00:00
hostname hostnamed,shared/hostname-setup: expose the origin of the current hostname 2020-12-16 11:03:36 +01:00
hwdb license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
id128 license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
import hostname-util: flagsify hostname_is_valid(), drop machine_name_is_valid() 2020-12-15 17:59:48 +01:00
initctl license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
journal Merge pull request #17967 from poettering/connect-user-bus 2020-12-15 21:14:01 +01:00
journal-remote fileio: teach read_full_file_full() to read from offset/with maximum size 2020-12-01 14:17:47 +01:00
kernel-install kernel-install: drop redundant "/" 2020-11-24 11:18:40 +01:00
libsystemd Merge pull request #17967 from poettering/connect-user-bus 2020-12-15 21:14:01 +01:00
libsystemd-network Merge pull request #17967 from poettering/connect-user-bus 2020-12-15 21:14:01 +01:00
libudev udev: introduce udev_queue_is_empty() and udev_queue_init() 2020-12-16 02:28:08 +09:00
locale license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
login logind: use free_and_strdup() where appropriate 2020-12-09 10:09:11 +01:00
machine hostname-util: flagsify hostname_is_valid(), drop machine_name_is_valid() 2020-12-15 17:59:48 +01:00
machine-id-setup license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
modules-load license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
mount license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
network Move hostname setup logic to new shared/hostname-setup.[ch] 2020-12-16 11:02:15 +01:00
notify license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
nspawn Move hostname setup logic to new shared/hostname-setup.[ch] 2020-12-16 11:02:15 +01:00
nss-myhostname license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
nss-mymachines nss-mymachines: initialize logging 2020-12-10 20:52:03 +01:00
nss-resolve nss-resolve: initialize logging, log json errors 2020-12-10 20:50:01 +01:00
nss-systemd nss-systemd: initialize logging 2020-12-10 20:51:59 +01:00
oom test: use for(;;) instead of while(true) 2020-11-27 14:35:20 +09:00
partition fileio: teach read_full_file_full() to read from offset/with maximum size 2020-12-01 14:17:47 +01:00
path license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
portable license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
pstore pstore: use log_oom() 2020-11-20 02:59:02 +09:00
quotacheck license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
random-seed license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
rc-local-generator license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
remount-fs license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
reply-password license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
resolve resolved: create stub-resolv.conf symlink with correct security label 2020-12-15 14:12:08 +01:00
rfkill license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
run license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
run-generator license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
shared hostnamed,shared/hostname-setup: expose the origin of the current hostname 2020-12-16 11:03:36 +01:00
shutdown tree-wide: update "that that" 2020-11-18 17:23:00 +09:00
sleep license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
socket-proxy license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
stdio-bridge stdio-bridge: add support for --system and --user 2020-12-15 18:01:20 +01:00
sulogin-shell license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
sysctl license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
system-update-generator license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
systemctl sd-bus: add API for connecting to a specific user's user bus of a specific container 2020-12-15 18:00:15 +01:00
systemd sd-bus: add API for connecting to a specific user's user bus of a specific container 2020-12-15 18:00:15 +01:00
sysusers specifiers: introduce common macros for generating specifier tables 2020-11-25 14:13:02 +09:00
sysv-generator license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
test shared/hostname-setup: add mode where we check what would be set, without doing 2020-12-16 11:02:17 +01:00
time-wait-sync license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
timedate timedate: use localtime_or_gmtime_r() and mktime_or_timegm() 2020-11-21 04:28:45 +09:00
timesync timesync: Make delaying attempts to contact servers configurable 2020-12-15 08:52:51 +09:00
tmpfiles tree-wide: sort specifiers and move common comments to specifier.h 2020-11-25 15:12:27 +09:00
tty-ask-password-agent license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
udev udev: drop license boilerplate 2020-12-16 02:31:44 +09:00
update-done license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
update-utmp tree-wide: use return value of log_xxx_errno() 2020-11-20 02:58:27 +09:00
user-sessions license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
userdb tree-wide: unsetenv cannot fail 2020-11-10 15:52:32 +01:00
vconsole license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
veritysetup veritysetup: also place udev socket dep 2020-12-10 20:44:12 +01:00
version
…
volatile-root license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00
xdg-autostart-generator license: LGPL-2.1+ -> LGPL-2.1-or-later 2020-11-09 13:23:58 +09:00