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core: change top-level drop-in from -.service.d to service.d

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Discussed in #13743, the -.service semantic conflicts with the
existing root mount and slice names, making this feature not
uniformly extensible to all types. Change the name to be
<type>.d instead.

Updating to this format also extends the top-level dropin to
unit types.
This commit is contained in:
Anita Zhang 2019-11-04 18:29:55 -08:00 committed by Zbigniew Jędrzejewski-Szmek
parent 8069017a0f
commit 3e1db806b0
11 changed files with 27 additions and 103 deletions
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7
NEWS
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@ -33,10 +33,9 @@ CHANGES WITH 244 in spe:
during early boot, so in practice this change has very little
effect.)
* The special -.service.d dropin directory may be used to add
configuration that affects all services. The "-.service" service name
is now disallowed (though hopefully no one would use such a service
name. -.mount gives us enough grief.)
* Unit files now support top level dropin directories of the form
<unit_type>.d/ (e.g. service.d/) that may be used to add configuration
that affects all corresponding unit files.
* The RuntimeMaxSec= setting is now supported by scopes, not just
.service units. This is particularly useful for PAM sessions which

13
man/systemd.service.xml
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@ -63,19 +63,6 @@
<para>The <citerefentry><refentrytitle>systemd-run</refentrytitle><manvolnum>1</manvolnum></citerefentry>
command allows creating <filename>.service</filename> and <filename>.scope</filename> units dynamically
and transiently from the command line.</para>
<para>In addition to the various drop-in behaviors described in
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
services also support a top-level drop-in with <filename>-.service.d/</filename> that allows
altering or adding to the settings of all services on the system.
The formatting and precedence of applying drop-in configurations follow what is defined in
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
However, configurations in <filename>-.service.d/</filename> have the lowest precedence compared to settings
in the service specific override directories. For example, for <filename>foo-bar-baz.service</filename>,
drop-ins in <filename>foo-bar-baz.service.d/</filename> override the ones in
<filename>foo-bar-.service.d/</filename>, which override the ones <filename>foo-.service.d/</filename>,
which override the ones in <filename>-.service.d/</filename>.
</para>
</refsect1>
<refsect1>

9
man/systemd.special.xml
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@ -119,15 +119,6 @@
</listitem>
</varlistentry>
<varlistentry>
<term><filename>-.service</filename></term>
<listitem>
<para>This is a reserved unit name used to support top-level drop-ins for services. See
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for details.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><filename>basic.target</filename></term>
<listitem>

11
man/systemd.unit.xml
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@ -192,9 +192,14 @@
over unit files wherever located. Multiple drop-in files with different names are applied in
lexicographic order, regardless of which of the directories they reside in.</para>
<para>Service units also support a top-level drop-in directory for modifying the settings of all service units. See
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
for details.</para>
<para>Units also support a top-level drop-in with <filename><replaceable>type</replaceable>.d/</filename>,
where <replaceable>type</replaceable> may be e.g. <literal>service</literal> or <literal>socket</literal>,
that allows altering or adding to the settings of all corresponding unit files on the system.
The formatting and precedence of applying drop-in configurations follow what is defined above.
Configurations in <filename><replaceable>type</replaceable>.d/</filename> have the lowest precedence
compared to settings in the name specific override directories. So the contents of
<filename>foo-.service.d/10-override.conf</filename> would override
<filename>service.d/10-override.conf</filename>.</para>
<!-- Note that we do not document .include here, as we consider it mostly obsolete, and want
people to use .d/ drop-ins instead. -->

4
src/basic/special.h
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@ -105,7 +105,3 @@
/* The root directory. */
#define SPECIAL_ROOT_MOUNT "-.mount"
/* Used to apply settings to all services through drop-ins.
* Should not exist as an actual service. */
#define SPECIAL_ROOT_SERVICE "-.service"

30
src/basic/unit-name.c
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@ -669,36 +669,6 @@ good:
return 0;
}
bool service_unit_name_is_valid(const char *name) {
_cleanup_free_ char *prefix = NULL, *s = NULL;
const char *e, *service_name = name;
if (!unit_name_is_valid(name, UNIT_NAME_ANY))
return false;
e = endswith(name, ".service");
if (!e)
return false;
/* If it's a template or instance, get the prefix as a service name. */
if (unit_name_is_valid(name, UNIT_NAME_INSTANCE|UNIT_NAME_TEMPLATE)) {
if (unit_name_to_prefix(name, &prefix) < 0)
return false;
s = strjoin(prefix, ".service");
if (!s)
return false;
service_name = s;
}
/* Reject reserved service name(s). */
if (streq(service_name, SPECIAL_ROOT_SERVICE))
return false;
return true;
}
int slice_build_parent_slice(const char *slice, char **ret) {
char *s, *dash;
int r;

2
src/basic/unit-name.h
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@ -58,8 +58,6 @@ static inline int unit_name_mangle(const char *name, UnitNameMangle flags, char
return unit_name_mangle_with_suffix(name, NULL, flags, ".service", ret);
}
bool service_unit_name_is_valid(const char *name);
int slice_build_parent_slice(const char *slice, char **ret);
int slice_build_subslice(const char *slice, const char *name, char **subslice);
bool slice_name_is_valid(const char *name);

5
src/core/service.c
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@ -549,11 +549,6 @@ static int service_verify(Service *s) {
assert(s);
assert(UNIT(s)->load_state == UNIT_LOADED);
if (!service_unit_name_is_valid(UNIT(s)->id)) {
log_unit_error(UNIT(s), "Service name is invalid or reserved. Refusing.");
return -EINVAL;
}
if (!s->exec_command[SERVICE_EXEC_START] && !s->exec_command[SERVICE_EXEC_STOP]
&& UNIT(s)->success_action == EMERGENCY_ACTION_NONE) {
/* FailureAction= only makes sense if one of the start or stop commands is specified.

22
src/shared/dropin.c
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@ -19,7 +19,6 @@
#include "mkdir.h"
#include "path-util.h"
#include "set.h"
#include "special.h"
#include "string-util.h"
#include "strv.h"
#include "unit-name.h"
@ -164,6 +163,10 @@ static int unit_file_find_dirs(
return r;
}
/* Return early for top level drop-ins. */
if (unit_type_from_string(name) >= 0)
return 0;
/* Let's see if there's a "-" prefix for this unit name. If so, let's invoke ourselves for it. This will then
* recursively do the same for all our prefixes. i.e. this means given "foo-bar-waldo.service" we'll also
* search "foo-bar-.service" and "foo-.service".
@ -244,16 +247,15 @@ int unit_file_find_dropin_paths(
name);
}
/* Special drop in for -.service. Add this first as it's the most generic
/* Special top level drop in for "<unit type>.<suffix>". Add this first as it's the most generic
* and should be able to be overridden by more specific drop-ins. */
if (type == UNIT_SERVICE)
STRV_FOREACH(p, lookup_path)
(void) unit_file_find_dirs(original_root,
unit_path_cache,
*p,
SPECIAL_ROOT_SERVICE,
dir_suffix,
&dirs);
STRV_FOREACH(p, lookup_path)
(void) unit_file_find_dirs(original_root,
unit_path_cache,
*p,
unit_type_to_string(type),
dir_suffix,
&dirs);
SET_FOREACH(name, names, i)
STRV_FOREACH(p, lookup_path)

19
src/test/test-unit-name.c
View File

@ -353,24 +353,6 @@ static void test_unit_name_build(void) {
free(t);
}
static void test_service_unit_name_is_valid(void) {
assert_se(service_unit_name_is_valid("foo.service"));
assert_se(service_unit_name_is_valid("foo@bar.service"));
assert_se(service_unit_name_is_valid("foo@bar@bar.service"));
assert_se(service_unit_name_is_valid("--.service"));
assert_se(service_unit_name_is_valid(".-.service"));
assert_se(service_unit_name_is_valid("-foo-bar.service"));
assert_se(service_unit_name_is_valid("-foo-bar-.service"));
assert_se(service_unit_name_is_valid("foo-bar-.service"));
assert_se(!service_unit_name_is_valid("-.service"));
assert_se(!service_unit_name_is_valid(""));
assert_se(!service_unit_name_is_valid("foo.slice"));
assert_se(!service_unit_name_is_valid("@.service"));
assert_se(!service_unit_name_is_valid("@bar.service"));
assert_se(!service_unit_name_is_valid("-@.service"));
}
static void test_slice_name_is_valid(void) {
assert_se( slice_name_is_valid(SPECIAL_ROOT_SLICE));
assert_se( slice_name_is_valid("foo.slice"));
@ -856,7 +838,6 @@ int main(int argc, char* argv[]) {
test_unit_prefix_is_valid();
test_unit_name_change_suffix();
test_unit_name_build();
test_service_unit_name_is_valid();
test_slice_name_is_valid();
test_build_subslice();
test_build_parent_slice();

8
test/TEST-15-DROPIN/test-dropin.sh
View File

@ -101,18 +101,18 @@ test_basic_dropins () {
check_ok b Wants c.service
systemctl stop a c
echo "*** test -.service.d/ top level drop-in"
echo "*** test service.d/ top level drop-in"
create_services a b
check_ko a ExecCondition "/bin/echo a"
check_ko b ExecCondition "/bin/echo b"
mkdir -p /usr/lib/systemd/system/-.service.d
cat >/usr/lib/systemd/system/-.service.d/override.conf <<EOF
mkdir -p /usr/lib/systemd/system/service.d
cat >/usr/lib/systemd/system/service.d/override.conf <<EOF
[Service]
ExecCondition=/bin/echo %n
EOF
check_ok a ExecCondition "/bin/echo a"
check_ok b ExecCondition "/bin/echo b"
rm -rf /usr/lib/systemd/system/-.service.d
rm -rf /usr/lib/systemd/system/service.d
clear_services a b c
}