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This patch removes includes that are not used. The removals were found with
include-what-you-use which checks if any of the symbols from a header is
in use.
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Simplify unit_name_mangle() and unit_name_mangle_with_suffix() to
always behave the same, and only append a suffix if there is no
type suffix. If a user says 'isolate blah.device' it is better to
return an error that the type cannot be isolated, than to try to
isolate blah.device.target.
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Make screened character set consistent with unit_name_mangle() by splitting off
the escaping loop into a separate function.
Before this fix, unit names such as `foo@bar.target` would get transformed
into `foo\x40bar.target` when unit_name_mangle_with_suffix() is used.
https://bugs.freedesktop.org/show_bug.cgi?id=86711
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We need to check for the last dot, not the first one in a unit name, for
the suffix. Correct that.
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GCC optimizes strlen("string constant") to a constant, even with -O0.
Thus, replace patterns like sizeof("string constant")-1 with
strlen("string constant") where possible, for clarity. In particular,
for expressions intended to add up the lengths of components going into
a string, this often makes it clearer that the expression counts the
trailing '\0' exactly once, by putting the +1 for the '\0' at the end of
the expression, rather than hidden in a sizeof in the middle of the
expression.
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../src/shared/unit-name.c:462: error: undefined reference to 'sd_bus_label_escape'
../src/shared/unit-name.c:477: error: undefined reference to 'sd_bus_label_unescape'
collect2: error: ld returned 1 exit status
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Suggested-by: Russ Allbery <rra@debian.org>
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root dir
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Only ASCII letters and digits are allowed.
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In order to prepare things for the single-writer cgroup scheme, let's
make logind use systemd's own primitives for cgroup management.
Every login user now gets his own private slice unit, in which his sessions
live in a scope unit each. Also, add user@$UID.service to the same
slice, and implicitly start it on first login.
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"Scope" units are very much like service units, however with the
difference that they are created from pre-existing processes, rather
than processes that systemd itself forks off. This means they are
generated programmatically via the bus API as transient units rather
than from static configuration read from disk. Also, they do not provide
execution-time parameters, as at the time systemd adds the processes to
the scope unit they already exist and the parameters cannot be applied
anymore.
The primary benefit of this new unit type is to create arbitrary cgroups
for worker-processes forked off an existing service.
This commit also adds a a new mode to "systemd-run" to run the specified
processes in a scope rather then a transient service.
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Transient units can be created via the bus API. They are configured via
the method call parameters rather than on-disk files. They are subject
to normal GC. Transient units currently may only be created for
services (however, we will extend this), and currently only ExecStart=
and the cgroup parameters can be configured (also to be extended).
Transient units require a unique name, that previously had no
configuration file on disk.
A tool systemd-run is added that makes use of this functionality to run
arbitrary command lines as transient services:
$ systemd-run /bin/ping www.heise.de
Will cause systemd to create a new transient service and run ping in it.
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- This changes all logind cgroup objects to use slice objects rather
than fixed croup locations.
- logind can now collect minimal information about running
VMs/containers. As fixed cgroup locations can no longer be used we
need an entity that keeps track of machine cgroups in whatever slice
they might be located. Since logind already keeps track of users,
sessions and seats this is a trivial addition.
- nspawn will now register with logind and pass various bits of metadata
along. A new option "--slice=" has been added to place the container
in a specific slice.
- loginctl gained commands to list, introspect and terminate machines.
- user.slice and machine.slice will now be pulled in by logind.service,
since only logind.service requires this slice.
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In order to prepare for the kernel cgroup rework, let's introduce a new
unit type to systemd, the "slice". Slices can be arranged in a tree and
are useful to partition resources freely and hierarchally by the user.
Each service unit can now be assigned to one of these slices, and later
on login users and machines may too.
Slices translate pretty directly to the cgroup hierarchy, and the
various objects can be assigned to any of the slices in the tree.
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For "systemctl snapshot" it makes no sense to complete an incomplete
name with ".service" as we previously did, use ".snapshot" instead.
Also, don't bother with mount units or suchlike, we know that this must
be a snapshot and hence is the only sane way for completion.
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The list of types and load states if lengthy, so a little reminder
can be sometimes useful.
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systemctl status a and systemctl status a.service lead to same output but
systemctl status a.b and systemctl status a.b.service do not.
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https://bugzilla.redhat.com/show_bug.cgi?id=855863
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https://bugs.freedesktop.org/show_bug.cgi?id=39386
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to make it look like the newly added unit_name_is_instance()
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https://bugzilla.redhat.com/show_bug.cgi?id=752774
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This is to match strappend() and the other string related functions.
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This makes it possible to use them from systemctl without linking
against the core.
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to unit-name.h
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This makes it possible to use them from systemctl without linking
against the core. A string->enum lookup table is added.
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unit names
This makes sure that
systemctl status /home
is implicitly translated to:
systemctl status /home.mount
Similar, /dev/foobar becomes dev-foobar.device.
Also, all characters that cannot be part of a unit name are implicitly
escaped.
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Use the same function in core and in systemctl.
get_unit_path() in systemctl becomes unnecessary.
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Supposed to prevent creating unit files like:
├── dev-sda1.device.wants
│ └── .dot.mount -> /run/systemd/generator/.dot.mount
├── .dot.mount
from:
# cat /etc/fstab
/dev/sda1 /.dot vfat ro 1 3
which we later skip reading because of the leading '.'.
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