This is also preparation for the installer later, split out of #38764.
It makes the experience a lot nicer if our nice little tools aren't
constantly interrupted by log spew from the kernel.
Fixes: #34448
For "wizard" style interactive tools it's very annoying if they are
interrupted by kernel log output or PID1's status output. let's add some
infra to disable this temporarily. I decided to implement this as an IPC
service so that we can make this robust: if the client request the
muting dies we can automatically unmute again.
This is hence a tiny varlink service, but it can also be started
directly from the cmdline.
discover-image.[ch] largely already supports per-scope operations, let's
extend this however to also cover finding .nspawn settings files and
managing the pool dir.
Let's rename the existing partition_verity_to_data() to
partition_verity_hash_to_data() and make a new partition_verity_to_data() that
handles both verity hash and verity signature partitions.
Rename other functions to match the new naming.
Currently it's next to impossible to find out why dissect_image()
has failed with EADDRNOTAVAIL, so let's add debug logging and use
EREMOTE for the different architectures error to help out with
debugging a bit.
When establishing a idmapped mount for a directory with foreign mapping
we so far insisted in the dir being properly opened (i.e. via a
non-O_PATH fd) being passed to mountfsd. This is problematic however,
since the client might not actually be able to open the dir (which after
all is owned by the foreign UID, not by the user). Hence, let's relax
the rules, and accept an O_PATH fd too (which the client can get even
without privs). This should be safe, since the load-bearing security
check is whether the dir has a parent owned by the client's UID, and
for that check O_PATH or not O_PATH is not relevant.
This is split out of #38764.
It mostly introduces the "chrome" stuff that puts a blue at the top of
bottom of the terminal screen when going through interactive tools such
as firstboot, homed-firstboot, and (in future) systemd-sysinstall).
it also introduces a generic "prompt_loop()" helper thatn queries the
user for some option in a loop until the rsponse matches certain
requirements. It's a generalization of a function of the same name that
so far only existed in firstboot.c. The more generic version will be
reused in a later PR by homed-firstboot and by sysinstall.
We'll soon have three different kind of interactive "wizard"-like console
UIs: systemd-firstboot, homectl firstboot and soon systemd-sysinstall.
Let's give them a limited, recognizable visual identity, to distinguish
them from the usual console output: let's add a bit of "chrome" to the
top and bottom of the screen, that we show during ther wizards, but hide
again afterwards.
This makes use of the DECSTBM sequence that reduces the scrolling area
by chopping off blocks from the top or bottom of the screen. The
sequence is quite standard, given it has been part of VT100 already.
xterm, vte, Linux console all support it just fine.
Add support for generating names like wldN based on DeviceTree aliases.
DeviceTree alias names follow de facto conventions. As of writing, there
are so far two ways WLAN devices are represented in DeviceTree aliases
in upstream Linux DTS files:
- Firstly, as wifi0, used for example in t600x-j314-j316.dtsi
- Secondly, as ethernet0 or ethernet1, used for example in
sun8i-q8-common.dtsi, with a comment saying the reason is to "Make
u-boot set mac-address for wifi without an eeprom"
So we need to handle both while generating names. Refactor most of the
logic in names_devicetree() into a helper
names_devicetree_alias_prefix() that takes an alias_prefix instead of
hardcoding "ethernet", and, in the new names_devicetree():
- For prefix "en", use alias_prefix "ethernet"
- For prefix "wl", try alias_prefix "wifi" first, and if that was not
found, fall back to alias_prefix "ethernet"
Since this is a naming scheme change, also gate this behind
NAMING_DEVICETREE_ALIASES_WLAN and NAMING_V259, and document this
change.
I initially didn't think it would be worth doing this, but I changed my
mind. People out there quite successfully build systemd without ACL
support, and that suggests life without it is quite possible. Moreover
we only use it as very specific places:
1. in udev/logind for "uaccess" mgmt
2. in tmpfiles to implement explicitly configured acl changes
3. in journald/coredump/pstore to manage access to unpriv users
4. in pid1 to manage access to credential files
5. when shifting UIDs of container trees
I specific container environments it should be entirely fine to live without all
of these, hence let's pull this in on demand only.
Add support for generating names like wldN based on DeviceTree aliases.
DeviceTree alias names follow de facto conventions. As of writing, there
are so far two ways WLAN devices are represented in DeviceTree aliases
in upstream Linux DTS files:
- Firstly, as wifi0, used for example in t600x-j314-j316.dtsi
- Secondly, as ethernet0 or ethernet1, used for example in
sun8i-q8-common.dtsi, with a comment saying the reason is to "Make
u-boot set mac-address for wifi without an eeprom"
Therefore for prefix "wl", try alias_prefix "wifi" first, and if that
was not found, fall back to alias_prefix "ethernet"
Since this is a naming scheme change, also gate this behind
NAMING_DEVICETREE_ALIASES_WLAN and NAMING_V259, and document this
change.
Block devices with removable media (e.g. SD card readers) indicate a
missing medium with a zero size. Optionally ignore such block devices
that carry no medium currently.
Follow-up for 882c9ce040
Prompted by #39077
Note that HAVE_PAM ifdeffery in pam-util.c is removed,
since its build as a whole is conditioned out if
!HAVE_PAM in shared/meson.build.
Let's do a "soft" reset of the TTY when a ptyfwd session ends. This is a
good idea, in order to reset changes to the scrolling window that code
inside the session might have made. A "soft" reset will undo this.
While we are at it, make sure to output the ansi sequences for this
*after* terminating any half-written line, as that is still somewhat
contents of the session, even if it's augmented.
Yu Watanabe
Daan De Meyer
Lennart Poettering
dramforever
Mike Yuan
Antonio Alvarez Feijoo