93651582ae
A compile time option is added to select behaviour: by default
UNIT_FILE_PRESET_ENABLE_ONLY is still used, but the intent is to change to
UNIT_FILE_PRESET_FULL at some point in the future. Distros that want to
opt-in can use the config option to change the behaviour.
(The option is just a boolean: it would be possible to make it multi-valued,
and allow full, enable-only, disable-only, none. But so far nobody has asked
for this, and it's better not to complicate things needlessly.)
With the configuration option flipped, instead of only doing enablements,
perform a full preset on first boot. The reason is that although
`/etc/machine-id` might be missing, there may be other files provisioned in
`/etc` (in fact, this use case is mentioned in `log_execution_mode`). Some of
those possible files include enablement symlinks even if presets dictate it
should be disabled.
Such a seemingly contradictory situation occurs in {RHEL,Fedora} CoreOS,
where we ship `/etc` as if `preset-all` were called. However, we want to
allow users to disable default-enabled services via Ignition, which does
this by creating preset dropins before switchroot. (For why we do
`preset-all` at compose time, see:
https://github.com/coreos/fedora-coreos-config/pull/77).
For example, the composed FCOS image has a `enable zincati.service`
preset and an enablement for that in `/etc`, while at boot time when we
switch root, there may be a `disable zincati.service` preset with higher
precedence. In that case, we want systemd to disable the service.
This is essentially a revert of
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.clusterfuzzlite | ||
.github | ||
.lgtm/cpp-queries | ||
.semaphore | ||
catalog | ||
coccinelle | ||
docs | ||
factory | ||
hwdb.d | ||
LICENSES | ||
man | ||
mkosi.default.d | ||
modprobe.d | ||
network | ||
po | ||
presets | ||
rules.d | ||
shell-completion | ||
src | ||
sysctl.d | ||
sysusers.d | ||
test | ||
tmpfiles.d | ||
tools | ||
units | ||
xorg | ||
.clang-format | ||
.ctags | ||
.dir-locals.el | ||
.editorconfig | ||
.gitattributes | ||
.gitignore | ||
.lgtm.yml | ||
.mailmap | ||
.packit.yml | ||
.vimrc | ||
.ycm_extra_conf.py | ||
configure | ||
LICENSE.GPL2 | ||
LICENSE.LGPL2.1 | ||
Makefile | ||
meson_options.txt | ||
meson.build | ||
mkosi.build | ||
mkosi.postinst | ||
NEWS | ||
README | ||
README.md | ||
TODO |
System and Service Manager
Details
Most documentation is available on systemd's web site.
Assorted, older, general information about systemd can be found in the systemd Wiki.
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Consult our NEWS file for information about what's new in the most recent systemd versions.
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