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TODO
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Bugfixes:
* Many manager configuration settings that are only applicable to user
manager or system manager can be always set. It would be better to reject
them when parsing config.
* userdbctl: "Password OK: yes" is shown even when there are no passwords
or the password is locked.
* Jun 01 09:43:02 krowka systemd[1]: Unit user@1000.service has alias user@.service.
Jun 01 09:43:02 krowka systemd[1]: Unit user@6.service has alias user@.service.
Jun 01 09:43:02 krowka systemd[1]: Unit user-runtime-dir@6.service has alias user-runtime-dir@.service.
External:
* Fedora: add an rpmlint check that verifies that all unit files in the RPM are listed in %systemd_post macros.
* dbus:
- natively watch for dbus-*.service symlinks (PENDING)
- teach dbus to activate all services it finds in /etc/systemd/services/org-*.service
* kernel: add device_type = "fb", "fbcon" to class "graphics"
* /usr/bin/service should actually show the new command line
* fedora: suggest auto-restart on failure, but not on success and not on coredump. also, ask people to think about changing the start limit logic. Also point people to RestartPreventExitStatus=, SuccessExitStatus=
* neither pkexec nor sudo initialize environ[] from the PAM environment?
* fedora: update policy to declare access mode and ownership of unit files to root:root 0644, and add an rpmlint check for it
* register catalog database signature as file magic
* zsh shell completion:
- <command> <verb> -<TAB> should complete options, but currently does not
- systemctl add-wants,add-requires
* systemctl status should know about 'systemd-analyze calendar ... --iterations='
* If timer has just OnInactiveSec=..., it should fire after a specified time
after being started.
* write blog stories about:
- hwdb: what belongs into it, lsusb
- enabling dbus services
- how to make changes to sysctl and sysfs attributes
- remote access
- how to pass throw-away units to systemd, or dynamically change properties of existing units
- testing with Harald's awesome test kit
- auto-restart
- how to develop against journal browsing APIs
- the journal HTTP iface
- non-cgroup resource management
- dynamic resource management with cgroups
- refreshed, longer missions statement
- calendar time events
- init=/bin/sh vs. "emergency" mode, vs. "rescue" mode, vs. "multi-user" mode, vs. "graphical" mode, and the debug shell
- how to create your own target
- instantiated apache, dovecot and so on
- hooking a script into various stages of shutdown/rearly booot
Regularly:
* look for close() vs. close_nointr() vs. close_nointr_nofail()
* check for strerror(r) instead of strerror(-r)
* pahole
* set_put(), hashmap_put() return values check. i.e. == 0 does not free()!
* use secure_getenv() instead of getenv() where appropriate
* link up selected blog stories from man pages and unit files Documentation= fields
Janitorial Clean-ups:
* Rearrange tests so that the various test-xyz.c match a specific src/basic/xyz.c again
* rework mount.c and swap.c to follow proper state enumeration/deserialization
semantics, like we do for device.c now
Features:
* add linker script that implicitly adds symbol for build ID and new coredump
json package metadata, and use that when logging
* systemd-dissect: show GPT disk UUID in output
* Enable RestricFileSystems= for all our long-running services (similar:
RestrictNetworkInterfaces=)
* Add systemd-analyze security checks for RestrictFileSystems= and
RestrictNetworkInterfaces=
* cryptsetup/homed: implement TOTP authentication backed by TPM2 and its
internal clock.
* nspawn: optionally set up nftables/iptables routes that forward UDP/TCP
traffic on port 53 to resolved stub 127.0.0.54
* man: rework os-release(5), and clearly separate our extension-release.d/ and
initrd-release parts, i.e. list explicitly which fields are about what.
* sysext: before applying a sysext, do a superficial validation run so that
things are not rearranged to wildy. I.e. protect against accidental fuckups,
such as masking out /usr/lib/ or so. We should probably refuse if existing
inodes are replaced by other types of inodes or so.
* sysext: ensure one can build a sysext that can safely apply to *any* system
(because it contains only static go binaries in /opt/ or so)
* userdb: when synthesizing NSS records, pick "best" password from defined
passwords, not just the first. i.e. if there are multiple defined, prefer
unlocked over locked and prefer non-empty over empty.
* maybe add a tool inspired by the GPT auto discovery spec that runs in the
initrd and rearranges the rootfs hierarchy via bind mounts, if
enabled. Specifically in some top-level dir /@auto/ it will look for
dirs/symlinks/subvolumes that are named after their purpose, and optionally
encode a version as well as assessment counters, and then mount them into the
file system tree to boot into, similar to how we do that for the gpt auto
logic. Maybe then bind mount the original root into /.superior or something
like that (so that update tools can look there). Further discussion in this
thread:
https://lists.freedesktop.org/archives/systemd-devel/2021-November/047059.html
The GPT dissection logic should automatically enable this tool whenever we
detect a specially marked root fs (i.e introduce a new generic root gpt type
for this, that is arch independent). The also implement this in the image
dissection logic, so that nspawn/RootImage= and so on grok it. Maybe make
generic enough so that it can also work for ostrees arrangements.
* if a path ending in ".auto.d/" is set for RootDirectory=/RootImage= then do a
strverscmp() of everything inside that dir and use that. i.e. implement very
simple version control. Also use this in systemd-nspawn --image= and so on.
* homed: while a home dir is not activated generate slightly different NSS
records for it, that reports the home dir as "/" and the shell as some binary
provided by us. Then, when an SSH login happens and SSH permits it our binary
is invoked. This binary can then talk to homed and activate the homedir if
it's not around yet, prompting the user for a password. Once that succeeded
we'll switch to the real user record, i.e. home dir and shell, and our tool
exec()s the latter. Net effect: ssh'ing into a homed account will just work:
we'll neatly prompt for the homedir's password if its needed. –– Building on
this we could take this even further: since this tool will potentially have
access to the client's ssh-agent (if ssh-agent forwarding is enabled) we
could implement SSH unlocking of a homedir with that: when enrolling a new
ssh pubkey in a user record we'd ask the ssh-agent to sign some random value
with the privkey, then use that as luks key to unlock the home dir. Will not
work for ECDSA keys since their signatures contain a random component, but
will work for RSA and Ed25519 keys.
* add tiny service that decrypts encrypted user records passed via initrd
credential logic and drops them into /run where nss-systemd can pick them up,
similar to /run/host/userdb/. Usecase: drop a root user JSON record there,
and use it in the initrd to log in as root with locally selected password,
for debugging purposes.
* drop dependency on libcap, replace by direct syscalls based on
CapabilityQuintet we already have. (This likely allows us drop drop libcap
dep in the base OS image)
* sysext: automatically activate sysext images dropped in via new sd-stub
sysext pickup logic.
* add concept for "exitrd" as inverse of "initrd", that we can transition to at
shutdown, and has similar security semantics. This should then take the place
of dracut's shutdown logic. Should probably support sysexts too. Care needs
to be taken that the resulting logic ends up in RAM, i.e. is copied out of
on-disk storage.
* sd-stub: automatically pick up microcode from ESP and synthesize initrd from
it, and measure it. Signing is not necessary, as microcode does that on its
own. Pass as first initrd to kernel.
* userdbd: implement an additional varlink service socket that provides the
host user db in restricted form, then allow this to be bind mounted into
sandboxed environments that want the host database in minimal form. All
records would be stripped of all meta info, except the basic UID/name
info. Then use this in portabled environments that do not use PrivateUsers=1.
* logind introduce two types of sessions: "heavy" and "light". The former would
be our current sessions. But the latter would be a new type of session that
is mostly the same but does not pull in user@.service or wait for it. Then,
allow configuration which type of session is desired via pam_systemd
parameters, and then make user@.service's session one of these "light" ones.
People could then choose to make FTP sessions and suchlike "light" if they
don't want the service manager to be started for that.
* /etc/veritytab: allow that the roothash column can be specified as fs path
including a path to an AF_UNIX path, similar to how we do things with the
keys of /etc/crypttab. That way people can store/provide the roothash
externally and provide to us on demand only.
* add high-level lockdown level for GPT dissection logic: e.g. an enum that can
be ANY (to mount anything), TRUSTED (to require that /usr is on signed
verity, but rest doesn't matter), LOCKEDDOWN (to require that everything is
on signed verity, except for ESP), SUPERLOCKDOWN (like LOCKEDDOWN but ESP not
allowed). And then maybe some flavours of that that declare what is expected
from home/srv/var… Then, add a new cmdline flag to all tools that parse such
images, to configure this. Also, add a kernel cmdline option for this, to be
honoured by the gpt auto generator.
* nspawn: maybe optionally insert .nspawn file as GPT partition into images, so
that such container images are entirely stand-alone and can be updated as
one.
* we probably should extend the root verity hash of the root fs into some PCR
on boot. (i.e. maybe add a crypttab option tpm2-measure=8 or so to measure it
into PCR 8)
* add a "policy" to the dissection logic. i.e. a bit mask what is OK to mount,
what must be read-only, what requires encryption, and what requires
authentication.
* in uefi stub: query firmware regarding which PCRs are being used, store that
in EFI var. then use this when enrolling TPM2 in cryptsetup to verify that
the selected PCRs actually are used by firmware.
* rework recursive read-only remount to use new mount API
* PAM: pick auf one authentication token from credentials
* tpm2: figure out if we need to do anything for TPM2 parameter encryption? And
if so, what precisely?
* when mounting disk images: if IMAGE_ID/IMAGE_VERSION is set in os-release
data in the image, make sure the image filename actually matches this, so
that images cannot be misused.
* New udev block device symlink names:
/dev/disk/by-parttypelabel/<pttype>/<ptlabel>. Use case: if pt label is used
as partition image version string, this is a safe way to reference a specific
version of a specific partition type, in particular where related partitions
are processed (e.g. verity + rootfs both named "LennartOS_0.7").
* in sd-id128: also parse UUIDs in RFC4122 URN syntax (i.e. chop off urn:uuid: prefix)
* DynamicUser= + StateDirectory= → use uid mapping mounts, too, in order to
make dirs appear under right UID.
* systemd-sysext: optionally, run it in initrd already, before transitioning
into host, to open up possibility for services shipped like that.
* maybe add a tool that displays most recent journal logs as QR code to scan
off screen and run it automatically on boot failures, emergency logs and
such. Use DRM APIs directly, see
https://github.com/dvdhrm/docs/blob/master/drm-howto/modeset.c for an example
for doing that.
* pass systemd-detect-virt result to generators as env var. Modifying behaviour
based on whether we are virtualized or not is a pretty common thing, hence
maybe just pass that info along for free in an env var. We cache the result
anyway, so it's basically free.
* introduce /dev/disk/root/* symlinks that allow referencing partitions on the
disk the rootfs is on in a reasonably secure way. (or maybe: add
/dev/gpt-auto-{home,srv,boot,…} similar in style to /dev/gpt-auto-root as we
already have it.
* whenever we receive fds via SCM_RIGHTS make sure none got dropped due to the
reception limit the kernel silently enforces.
* add an Open= setting to service unit files that can open arbitrary file
system paths at service startup time and pass them to the service process via
our usual socket activation protocol. If passed path refers to AF_UNIX
socket: connect() to it.
* add a ConnectSocket= setting to service unit files, that may reference a
socket unit, and which will connect to the socket defined therein, and pass
the resulting fd to the service program via socket activation proto.
* Add a concept of ListenStream=anonymous to socket units: listen on a socket
that is deleted in the fs. Usecase would be with ConnectSocket= above.
* importd: support image signature verification with PKCS#7 + OpenBSD signify
logic, as alternative to crummy gpg
* sysext: optionally, if the merged trees allow it use bind mounts instead of
overlayfs
* add "systemd-analyze debug" + AttachDebugger= in unit files: The former
specifies a command to execute; the latter specifies that an already running
"systemd-analyze debug" instance shall be contacted and execution paused
until it gives an OK. That way, tools like gdb or strace can be safely be
invoked on processes forked off PID 1.
* expose MS_NOSYMFOLLOW in various places
* make LoadCredential= automatically find credentials in /etc/creds,
/run/creds, … and so on, if path component is unqualified
* teach LoadCredential=/LoadCredentialEncrypted= to load credentials from
kernel cmdline, maybe: LoadCredentialEncrypted=foobar:proc-cmdline:foobar
* credentials system:
- acquire from kernel command line
- acquire from EFI variable?
- acquire via via ask-password?
- acquire creds via keyring?
- pass creds via keyring?
- pass creds via memfd?
- acquire + decrypt creds from pkcs11?
- make systemd-cryptsetup acquire pw via creds logic
- make PAMName= acquire pw via creds logic
- make macsec/wireguard code in networkd read key via creds logic
- make gatwayd/remote read key via creds logic
- add sd_notify() command for flushing out creds not needed anymore
* teach LoadCredential= the ability to load all files from a specified dir as
individual creds
* add tpm.target or so which is delayed until TPM2 device showed up in case
firmware indicates there is one.
* tpm2: support a PIN policy, i.e. allowing windows-style short authentication
passwords by using the TPM2 to enforce ratelimiting and such, use for
cryptsetup and homed
* Add concept for upgrading TPM2 enrollments, maybe a new switch
--pcrs=4:<hash> or so, i.e. select a PCR to include in the hash, and then
override its hash
* TPM2: auto-reenroll in cryptsetup, as fallback for hosed firmware upgrades
and such
* introduce a new group to own TPM devices
* cryptsetup: if only recovery keys are registered and no regular passphrases,
ask user for "recovery key", not "passphrase"
* cyptsetup: add option for automatically removing empty password slot on boot
* cryptsetup: optionally, when run during boot-up and password is never
entered, and we are on battery power (or so), power off machine again
* cryptsetup: when waiting for FIDO2/PKCS#11 token, tell plymouth that, and
allow plymouth to abort the waiting and enter pw instead
* make cryptsetup lower --iter-time
* cryptsetup: allow encoding key directly in /etc/crypttab, maybe with a
"base64:" prefix. Useful in particular for pkcs11 mode.
* cryptsetup: reimplement the mkswap/mke2fs in cryptsetup-generator to use
systemd-makefs.service instead.
* cryptsetup:
- cryptsetup-generator: allow specification of passwords in crypttab itself
- support rd.luks.allow-discards= kernel cmdline params in cryptsetup generator
* when configuring loopback netif, and it fails due to EPERM, eat up error if
it happens to be set up alright already.
* at boot: check if battery above some threshold, if not power off again after explanation
* userdb: add field for ambient caps, so that a user can have CAP_WAKE_ALARM
for example. And add code that resets ambient caps for all services by
default.
* sd-bus: when connecting to some dbus server socker, set originating AF_UNIX
socket name in abstract namespace to include "description" string, and pick
it up from there in sd_bus_creds logic. i.e. we can use the socket peer
address as conduit for some minimal connection metainfo, and use it to
restore the "description" logic that kdbus used to have.
* systemd-analyze netif that explains predictable interface (or networkctl)
* Add service setting to run a service within the specified VRF. i.e. do the
equivalent of "ip vrf exec".
* change SwitchRoot() implementation in PID 1 to use pivot_root(".", "."), as
documented in the pivot_root(2) man page, so that we can drop the /oldroot
temporary dir.
* special case some calls of chase_symlinks() to use openat2() internally, so
that the kernel does what we otherwise do.
* add a new flag to chase_symlinks() that stops chasing once the first missing
component is found and then allows the caller to create the rest.
* make use of new glibc 2.32 APIs sigabbrev_np() and strerrorname_np().
* if /usr/bin/swapoff fails due to OOM, log a friendly explanatory message about it
* Remove any support for booting without /usr pre-mounted in the initrd entirely.
Update INITRD_INTERFACE.md accordingly.
* pid1: Move to tracking of main pid/control pid of units per pidfd
* pid1: support new clone3() fork-into-cgroup feature
* pid1: also remove PID files of a service when the service starts, not just
when it exits
* make us use dynamically fewer deps for containers in general purpose distros:
o turn into dlopen() deps:
- p11-kit-trust (always)
- kmod-libs (only when called from PID 1)
- libblkid (only in RootImage= handling in PID 1, but not elsewhere)
- libpam (only when called from PID 1)
- bzip2, xz, lz4 (always — gzip and zstd should probably stay static deps the way they are,
since they are so basic and our defaults)
o move into separate libsystemd-shared-iptables.so .so
- iptables-libs (only used by nspawn + networkd)
* seccomp: maybe use seccomp_merge() to merge our filters per-arch if we can.
Apparently kernel performance is much better with fewer larger seccomp
filters than with more smaller seccomp filters.
* systemd-path: add ESP and XBOOTLDR path. Add "private" runtime/state/cache dir enum,
mapping to $RUNTIME_DIRECTORY, $STATE_DIRECTORY and such
* All tools that support --root= should also learn --image= so that they can
operate on disk images directly. Specifically: bootctl, systemctl,
coredumpctl. (Already done: systemd-nspawn, systemd-firstboot,
systemd-repart, systemd-tmpfiles, systemd-sysusers, journalctl)
* seccomp: by default mask x32 ABI system wide on x86-64. it's on its way out
* seccomp: don't install filters for ABIs that are masked anyway for the
specific service
* seccomp: maybe merge all filters we install into one with that libseccomp API that allows merging.
* busctl: maybe expose a verb "ping" for pinging a dbus service to see if it
exists and responds.
* Maybe add a separate GPT partition type to the discoverable partition spec
for "hibernate" partitions, that are exactly like swap partitions but only
activated right before hibernation and thus never used for regular swapping.
* socket units: allow creating a udev monitor socket with ListenDevices= or so,
with matches, then activate app through that passing socket over
* unify on openssl:
- port journald + fsprg over from libgcrypt
- when that's done: kill gnutls support in resolved
* add growvol and makevol options for /etc/crypttab, similar to
x-systemd.growfs and x-systemd-makefs.
* userdb: allow username prefix searches in varlink API, allow realname and
realname substr searches in varlink API
* userdb: allow uid/gid range checks
* userdb: allow existence checks
* pid1: activation by journal search expression
* when switching root from initrd to host, set the machine_id env var so that
if the host has no machine ID set yet we continue to use the random one the
initrd had set.
* sd-event: add native support for P_ALL waitid() watching, then move PID 1 to
it for reaping assigned but unknown children. This needs to some special care
to operate somewhat sensibly in light of priorities: P_ALL will return
arbitrary processes, regardless of the priority we want to watch them with,
hence on each event loop iteration check all processes which we shall watch
with higher prio explicitly, and then watch the entire rest with P_ALL.
* tweak sd-event's child watching: keep a prioq of children to watch and use
waitid() only on the children with the highest priority until one is waitable
and ignore all lower-prio ones from that point on
* maybe introduce xattrs that can be set on the root dir of the root fs
partition that declare the volatility mode to use the image in. Previously I
thought marking this via GPT partition flags but that's not ideal since
that's outside of the LUKS encryption/verity verification, and we probably
shouldn't operate in a volatile mode unless we got told so from a trusted
source.
* coredump: maybe when coredumping read a new xattr from /proc/$PID/exe that
may be used to mark a whole binary as non-coredumpable. Would fix:
https://bugs.freedesktop.org/show_bug.cgi?id=69447
* teach parse_timestamp() timezones like the calendar spec already knows it
* beef up hibernation to optionally do swapon/swapoff immediately before/after
the hibernation
* beef up s2h to implement a battery watch loop: instead of entering
hibernation unconditionally after coming back from resume make a decision
based on the battery load level: if battery level is above a specific
threshold, go to suspend again, only hibernate if below it. This means we'd
stick to suspend usually, but fall back to hibernation only when battery runs
empty (well, subject to our sampling interval). Related to this, check if we
can make ACPI _BTP (i.e. /sys/class/power_supply/*/alarm) work for us too,
i.e. see if it can wake up machines from suspend, so that we could resume
automatically when the system is low on power and move automatically to
hibernation mode. (see
https://uefi.org/sites/default/files/resources/ACPI%206_2_A_Sept29.pdf
section 10.2.2.8 and
https://docs.microsoft.com/en-us/windows-hardware/design/device-experiences/modern-standby-wake-sources
at the end).
* We should probably replace /etc/rc.d/README with a symlink to doc
content. After all it is constant vendor data.
* maybe add kernel cmdline params: to force random seed crediting
* introduce a new per-process uuid, similar to the boot id, the machine id, the
invocation id, that is derived from process creds, specifically a hashed
combination of AT_RANDOM + getpid() + the starttime from
/proc/self/status. Then add these ids implicitly when logging. Deriving this
uuid from these three things has the benefit that it can be derived easily
from /proc/$PID/ in a stable, and unique way that changes on both fork() and
exec().
* let's not GC a unit while its ratelimits are still pending
* when killing due to service watchdog timeout maybe detect whether target
process is under ptracing and then log loudly and continue instead.
* make rfkill uaccess controllable by default, i.e. steal rule from
gnome-bluetooth and friends
* make MAINPID= message reception checks even stricter: if service uses User=,
then check sending UID and ignore message if it doesn't match the user or
root.
* maybe trigger a uevent "change" on a device if "systemctl reload xyz.device"
is issued.
* when importing an fs tree with machined, optionally apply userns-rec-chown
* when importing an fs tree with machined, complain if image is not an OS
* Maybe introduce a helper safe_exec() or so, which is to execve() which
safe_fork() is to fork(). And then make revert the RLIMIT_NOFILE soft limit
to 1K implicitly, unless explicitly opted-out.
* rework seccomp/nnp logic that even if User= is used in combination with
a seccomp option we don't have to set NNP. For that, change uid first whil
keeping CAP_SYS_ADMIN, then apply seccomp, the drop cap.
* when no locale is configured, default to UEFI's PlatformLang variable
* add a new syscall group "@esoteric" for more esoteric stuff such as bpf() and
usefaultd() and make systemd-analyze check for it.
* paranoia: whenever we process passwords, call mlock() on the memory
first. i.e. look for all places we use free_and_erasep() and
augment them with mlock(). Also use MADV_DONTDUMP.
Alternatively (preferably?) use memfd_secret().
* Move RestrictAddressFamily= to the new cgroup create socket
* support the bind/connect/sendmsg cgroup stuff for sandboxing, and possibly
patching around
* maybe implicitly attach monotonic+realtime timestamps to outgoing messages in
log.c and sd-journal-send
* optionally: turn on cgroup delegation for per-session scope units
* introduce per-unit (i.e. per-slice, per-service) journal log size limits.
* sd-boot: optionally, show boot menu when previous default boot item has
non-zero "tries done" count
* augment CODE_FILE=, CODE_LINE= with something like CODE_BASE= or so which
contains some identifier for the project, which allows us to include
clickable links to source files generating these log messages. The identifier
could be some abberviated URL prefix or so (taking inspiration from Go
imports). For example, for systemd we could use
CODE_BASE=github.com/systemd/systemd/blob/98b0b1123cc or so which is
sufficient to build a link by prefixing "http://" and suffixing the
CODE_FILE.
* Augment MESSAGE_ID with MESSAGE_BASE, in a similar fashion so that we can
make clickable links from log messages carrying a MESSAGE_ID, that lead to
some explanatory text online.
* maybe extend .path units to expose fanotify() per-mount change events
* When reloading configuration PID 1 should reset all its properties to the
original defaults before calling parse_config()
* hibernate/s2h: make this robust and safe to enable in Fedora by default.
Specifically:
1. add resume_offset support to the resume code (i.e. support swap files
properly)
2. check if swap is on weird storage and refuse if so
3. add auto-detection of hibernation images
* cgroups: use inotify to get notified when somebody else modifies cgroups
owned by us, then log a friendly warning.
* beef up log.c with support for stripping ANSI sequences from strings, so that
it is OK to include them in log strings. This would be particularly useful so
that our log messages could contain clickable links for example for unit
files and suchlike we operate on.
* importd: add ability download images for portabled + sysext
* add support for "portablectl attach http://foobar.com/waaa.raw (i.e. importd integration)
* sync dynamic uids/gids between host+portable srvice (i.e. if DynamicUser=1 is set for a service, make sure that the
selected user is resolvable in the service even if it ships its own /etc/passwd)
* Fix DECIMAL_STR_MAX or DECIMAL_STR_WIDTH. One includes a trailing NUL, the
other doesn't. What a disaster. Probably to exclude it. Also
DECIMAL_STR_WIDTH should probably add an extra "-" into account for negative
numbers.
* Check that users of inotify's IN_DELETE_SELF flag are using it properly, as
usually IN_ATTRIB is the right way to watch deleted files, as the former only
fires when a file is actually removed from disk, i.e. the link count drops to
zero and is not open anymore, while the latter happens when a file is
unlinked from any dir.
* port systemctl, busctl, … over to format-table.[ch]'s table formatters
* pid1: lock image configured with RootDirectory=/RootImage= using the usual nspawn semantics while the unit is up
* add --vacuum-xyz options to coredumpctl, matching those journalctl already has.
* introduce Ephemeral= unit file switch, that creates an ephemeral copy of all
files and directories that are left writable for a unit, and which are
removed after the unit goes down again. A bit like --ephemeral for
systemd-nspawn but for system services. If used together with RootImage= this
should reflink the image file itself.
Related: add Ephemeral=<path1> <path2> … which would allow marking
specific paths only like this.
* add CopyFile= or so as unit file setting that may be used to copy files or
directory trees from the host to the services RootImage= and RootDirectory=
environment. Which we can use for /etc/machine-id and in particular
/etc/resolv.conf. Should be smart and do something useful on read-only
images, for example fall back to read-only bind mounting the file instead.
* show invocation ID in systemd-run output
* bypass SIGTERM state in unit files if KillSignal is SIGKILL
* add proper dbus APIs for the various sd_notify() commands, such as MAINPID=1
and so on, which would mean we could report errors and such.
* introduce DefaultSlice= or so in system.conf that allows changing where we
place our units by default, i.e. change system.slice to something
else. Similar, ManagerSlice= should exist so that PID1's own scope unit could
be moved somewhere else too. Finally machined and logind should get similar
options so that it is possible to move user session scopes and machines to a
different slice too by default. Usecase: people who want to put resources on
the entire system, with the exception of one specific service. See:
https://lists.freedesktop.org/archives/systemd-devel/2018-February/040369.html
* maybe rework get_user_creds() to query the user database if $SHELL is used
for root, but only then.
* be stricter with fds we receive for the fdstore: close them asynchronously
* calenderspec: add support for week numbers and day numbers within a
year. This would allow us to define "bi-weekly" triggers safely.
* sd-bus: add vtable flag, that may be used to request client creds implicitly
and asynchronously before dispatching the operation
* sd-bus: parse addresses given in sd_bus_set_addresses immediately and not
only when used. Add unit tests.
* make use of ethtool veth peer info in machined, for automatically finding out
host-side interface pointing to the container.
* add some special mode to LogsDirectory=/StateDirectory=… that allows
declaring these directories without necessarily pulling in deps for them, or
creating them when starting up. That way, we could declare that
systemd-journald writes to /var/log/journal, which could be useful when we
doing disk usage calculations and so on.
* taint systemd if there are fewer than 65536 users assigned (userns) to the system.
* deprecate RootDirectoryStartOnly= in favour of a new ExecStart= prefix char
* add a new RuntimeDirectoryPreserve= mode that defines a similar lifecycle for
the runtime dir as we maintain for the fdstore: i.e. keep it around as long
as the unit is running or has a job queued.
* support projid-based quota in machinectl for containers
* add a way to lock down cgroup migration: a boolean, which when set for a unit
makes sure the processes in it can never migrate out of it
* blog about fd store and restartable services
* document Environment=SYSTEMD_LOG_LEVEL=debug drop-in in debugging document
* rework ExecOutput and ExecInput enums so that EXEC_OUTPUT_NULL loses its
magic meaning and is no longer upgraded to something else if set explicitly.
* in the long run: permit a system with /etc/machine-id linked to /dev/null, to
make it lose its identity, i.e. be anonymous. For this we'd have to patch
through the whole tree to make all code deal with the case where no machine
ID is available.
* optionally, collect cgroup resource data, and store it in per-unit RRD files,
suitable for processing with rrdtool. Add bus API to access this data, and
possibly implement a CPULoad property based on it.
* beef up pam_systemd to take unit file settings such as cgroups properties as
parameters
* maybe hook of xfs/ext4 quotactl() with services? i.e. automatically manage
the quota of the user indicated in User= via unit file settings, like the
other resource management concepts. Would mix nicely with DynamicUser=1. Or
alternatively, do this with projids, so that we can also cover services
running as root. Quota should probably cover all the special dirs such as
StateDirectory=, LogsDirectory=, CacheDirectory=, as well as RootDirectory= if it
is set, plus the whole disk space any image configured with RootImage=.
* In DynamicUser= mode: before selecting a UID, use disk quota APIs on relevant
disks to see if the UID is already in use.
* expose IO accounting data on the bus, show it in systemd-run --wait and log
about it in the resource log message
* Add AddUser= setting to unit files, similar to DynamicUser=1 which however
creates a static, persistent user rather than a dynamic, transient user. We
can leverage code from sysusers.d for this.
* add some optional flag to ReadWritePaths= and friends, that has the effect
that we create the dir in question when the service is started. Example:
ReadWritePaths=:/var/lib/foobar
* hostnamed: populate form factor data from a new hwdb database, so that old
yogas can be recognized as "convertible" too, even if they predate the DMI
"convertible" form factor
* Add ExecMonitor= setting. May be used multiple times. Forks off a process in
the service cgroup, which is supposed to monitor the service, and when it
exits the service is considered failed by its monitor.
* track the per-service PAM process properly (i.e. as an additional control
process), so that it may be queried on the bus and everything.
* add a new "debug" job mode, that is propagated to unit_start() and for
services results in two things: we raise SIGSTOP right before invoking
execve() and turn off watchdog support. Then, use that to implement
"systemd-gdb" for attaching to the start-up of any system service in its
natural habitat.
* gpt-auto logic: support encrypted swap, add kernel cmdline option to force it, and honour a gpt bit about it, plus maybe a configuration file
* add a percentage syntax for TimeoutStopSec=, e.g. TimeoutStopSec=150%, and
then use that for the setting used in user@.service. It should be understood
relative to the configured default value.
* enable LockMLOCK to take a percentage value relative to physical memory
* Permit masking specific netlink APIs with RestrictAddressFamily=
* define gpt header bits to select volatility mode
* ProtectClock= (drops CAP_SYS_TIMES, adds seecomp filters for settimeofday, adjtimex), sets DeviceAllow o /dev/rtc
* ProtectTracing= (drops CAP_SYS_PTRACE, blocks ptrace syscall, makes /sys/kernel/tracing go away)
* ProtectMount= (drop mount/umount/pivot_root from seccomp, disallow fuse via DeviceAllow, imply Mountflags=slave)
* ProtectKeyRing= to take keyring calls away
* RemoveKeyRing= to remove all keyring entries of the specified user
* ProtectReboot= that masks reboot() and kexec_load() syscalls, prohibits kill
on PID 1 with the relevant signals, and makes relevant files in /sys and
/proc (such as the sysrq stuff) unavailable
* Support ReadWritePaths/ReadOnlyPaths/InaccessiblePaths in systemd --user instances
via the new unprivileged Landlock LSM (https://landlock.io)
* make sure the ratelimit object can deal with USEC_INFINITY as way to turn off things
* in nss-systemd, if we run inside of RootDirectory= with PrivateUsers= set,
find a way to map the User=/Group= of the service to the right name. This way
a user/group for a service only has to exist on the host for the right
mapping to work.
* add bus API for creating unit files in /etc, reusing the code for transient units
* add bus API to remove unit files from /etc
* add bus API to retrieve current unit file contents (i.e. implement "systemctl cat" on the bus only)
* rework fopen_temporary() to make use of open_tmpfile_linkable() (problem: the
kernel doesn't support linkat() that replaces existing files, currently)
* transient units: don't bother with actually setting unit properties, we
reload the unit file anyway
* optionally, also require WATCHDOG=1 notifications during service start-up and shutdown
* cache sd_event_now() result from before the first iteration...
* PID1: find a way how we can reload unit file configuration for
specific units only, without reloading the whole of systemd
* add an explicit parser for LimitRTPRIO= that verifies
the specified range and generates sane error messages for incorrect
specifications.
* when we detect that there are waiting jobs but no running jobs, do something
* push CPUAffinity= also into the "cpuset" cgroup controller
* PID 1 should send out sd_notify("WATCHDOG=1") messages (for usage in the --user mode, and when run via nspawn)
* there's probably something wrong with having user mounts below /sys,
as we have for debugfs. for example, src/core/mount.c handles mounts
prefixed with /sys generally special.
http://lists.freedesktop.org/archives/systemd-devel/2015-June/032962.html
* fstab-generator: default to tmpfs-as-root if only usr= is specified on the kernel cmdline
* initrd-parse-etc.service: can we skip daemon-reload if /sysroot/etc/fstab is missing?
Note that we start initrd-fs.target and initrd-cleanup.target there, so a straightforward
ConditionPathExists= is not enough.
* docs: bring http://www.freedesktop.org/wiki/Software/systemd/MyServiceCantGetRealtime up to date
* add a job mode that will fail if a transaction would mean stopping
running units. Use this in timedated to manage the NTP service
state.
http://lists.freedesktop.org/archives/systemd-devel/2015-April/030229.html
* The udev blkid built-in should expose a property that reflects
whether media was sensed in USB CF/SD card readers. This should then
be used to control SYSTEMD_READY=1/0 so that USB card readers aren't
picked up by systemd unless they contain a medium. This would mirror
the behaviour we already have for CD drives.
* hostnamectl: show root image uuid
* Find a solution for SMACK capabilities stuff:
http://lists.freedesktop.org/archives/systemd-devel/2014-December/026188.html
* synchronize console access with BSD locks:
http://lists.freedesktop.org/archives/systemd-devel/2014-October/024582.html
* as soon as we have sender timestamps, revisit coalescing multiple parallel daemon reloads:
http://lists.freedesktop.org/archives/systemd-devel/2014-December/025862.html
* figure out when we can use the coarse timers
* maybe allow timer units with an empty Units= setting, so that they
can be used for resuming the system but nothing else.
* what to do about udev db binary stability for apps? (raw access is not an option)
* exponential backoff in timesyncd when we cannot reach a server
* timesyncd: add ugly bus calls to set NTP servers per-interface, for usage by NM
* merge ~/.local/share and ~/.local/lib into one similar /usr/lib and /usr/share....
* add systemd.abort_on_kill or some other such flag to send SIGABRT instead of SIGKILL
(throughout the codebase, not only PID1)
* drop nss-myhostname in favour of nss-resolve?
* resolved:
- mDNS/DNS-SD
- service registration
- service/domain/types browsing
- avahi compat
- DNS-SD service registration from socket units
- resolved should optionally register additional per-interface LLMNR
names, so that for the container case we can establish the same name
(maybe "host") for referencing the server, everywhere.
- allow clients to request DNSSEC for a single lookup even if DNSSEC is off (?)
- hook up resolved with machined-based address resolution
* refcounting in sd-resolve is borked
* add new gpt type for btrfs volumes
* generator that automatically discovers btrfs subvolumes, identifies their purpose based on some xattr on them.
* a way for container managers to turn off getty starting via $container_headless= or so...
* figure out a nice way how we can let the admin know what child/sibling unit causes cgroup membership for a specific unit
* For timer units: add some mechanisms so that timer units that trigger immediately on boot do not have the services
they run added to the initial transaction and thus confuse Type=idle.
* add bus api to query unit file's X fields.
* gpt-auto-generator:
- Define new partition type for encrypted swap? Support probed LUKS for encrypted swap?
- Make /home automount rather than mount?
* add generator that pulls in systemd-network from containers when
CAP_NET_ADMIN is set, more than the loopback device is defined, even
when it is otherwise off
* MessageQueueMessageSize= (and suchlike) should use parse_iec_size().
* implement Distribute= in socket units to allow running multiple
service instances processing the listening socket, and open this up
for ReusePort=
* cgroups:
- implement per-slice CPUFairScheduling=1 switch
- introduce high-level settings for RT budget, swappiness
- how to reset dynamically changed unit cgroup attributes sanely?
- when reloading configuration, apply new cgroup configuration
- when recursively showing the cgroup hierarchy, optionally also show
the hierarchies of child processes
* transient units:
- add field to transient units that indicate whether systemd or somebody else saves/restores its settings, for integration with libvirt
* when we detect low battery and no AC on boot, show pretty splash and refuse boot
* libsystemd-journal, libsystemd-login, libudev: add calls to easily attach these objects to sd-event event loops
* be more careful what we export on the bus as (usec_t) 0 and (usec_t) -1
* rfkill,backlight: we probably should run the load tools inside of the udev rules so that the state is properly initialized by the time other software sees it
* After coming back from hibernation reset hibernation swap partition using the /dev/snapshot ioctl APIs
* If we try to find a unit via a dangling symlink, generate a clean
error. Currently, we just ignore it and read the unit from the search
path anyway.
* refuse boot if /usr/lib/os-release is missing or /etc/machine-id cannot be set up
* man: the documentation of Restart= currently is very misleading and suggests the tools from ExecStartPre= might get restarted.
* load .d/*.conf dropins for device units
* There's currently no way to cancel fsck (used to be possible via C-c or c on the console)
* add option to sockets to avoid activation. Instead just drop packets/connections, see http://cyberelk.net/tim/2012/02/15/portreserve-systemd-solution/
* make sure systemd-ask-password-wall does not shutdown systemd-ask-password-console too early
* verify that the AF_UNIX sockets of a service in the fs still exist
when we start a service in order to avoid confusion when a user
assumes starting a service is enough to make it accessible
* Make it possible to set the keymap independently from the font on
the kernel cmdline. Right now setting one resets also the other.
* and a dbus call to generate target from current state
* investigate whether the gnome pty helper should be moved into systemd, to provide cgroup support.
* dot output for --test showing the 'initial transaction'
* be able to specify a forced restart of service A where service B depends on, in case B
needs to be auto-respawned?
* pid1:
- When logging about multiple units (stopping BoundTo units, conflicts, etc.),
log both units as UNIT=, so that journalctl -u triggers on both.
- generate better errors when people try to set transient properties
that are not supported...
http://lists.freedesktop.org/archives/systemd-devel/2015-February/028076.html
- maybe introduce WantsMountsFor=? Usecase:
http://lists.freedesktop.org/archives/systemd-devel/2015-January/027729.html
- recreate systemd's D-Bus private socket file on SIGUSR2
- move PAM code into its own binary
- when we automatically restart a service, ensure we restart its rdeps, too.
- hide PAM options in fragment parser when compile time disabled
- Support --test based on current system state
- If we show an error about a unit (such as not showing up) and it has no Description string, then show a description string generated form the reverse of unit_name_mangle().
- after deserializing sockets in socket.c we should reapply sockopts and things
- drop PID 1 reloading, only do reexecing (difficult: Reload()
currently is properly synchronous, Reexec() is weird, because we
cannot delay the response properly until we are back, so instead of
being properly synchronous we just keep open the fd and close it
when done. That means clients do not get a successful method reply,
but much rather a disconnect on success.
- when breaking cycles drop sysv services first, then services from /run, then from /etc, then from /usr
- when a bus name of a service disappears from the bus make sure to queue further activation requests
- maybe introduce CoreScheduling=yes/no to optionally set a PR_SCHED_CORE cookie, so that all
processes in a service's cgroup share the same cookie and are guaranteed not to share SMT cores
with other units https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/hw-vuln/core-scheduling.rst
* unit files:
- allow port=0 in .socket units
- maybe introduce ExecRestartPre=
- add ReloadSignal= for configuring a reload signal to use
- implement Register= switch in .socket units to enable registration
in Avahi, RPC and other socket registration services.
- allow Type=simple with PIDFile=
https://bugzilla.redhat.com/show_bug.cgi?id=723942
- allow writing multiple conditions in unit files on one line
- introduce Type=pid-file
- add a concept of RemainAfterExit= to scope units
- Allow multiple ExecStart= for all Type= settings, so that we can cover rescue.service nicely
- add verification of [Install] section to systemd-analyze verify
* timer units:
- timer units should get the ability to trigger when: