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condition: allow overriding of ConditionNeedsUpdate= on the kernel command line

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This should be useful for addressing #15724.
This commit is contained in:
Lennart Poettering 2020-05-14 09:55:57 +02:00
parent 3931056767
commit f8b4ae29c7
4 changed files with 27 additions and 0 deletions
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9
man/kernel-command-line.xml
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@ -436,6 +436,15 @@
will not query the user for basic system settings, even if the system boots up for the first time and the
relevant settings are not initialized yet.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>systemd.condition-needs-update=</varname></term>
<listitem><para>Takes a boolean argument. If specified, overrides the result of
<varname>ConditionNeedsUpdate=</varname> unit condition checks. See
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
details.</para></listitem>
</varlistentry>
</variablelist>
</refsect1>

4
man/systemd-update-done.service.xml
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@ -58,6 +58,10 @@
<citerefentry project='man-pages'><refentrytitle>touch</refentrytitle><manvolnum>1</manvolnum></citerefentry>
on it.</para>
<para>Note that if the <varname>systemd.condition-needs-update=</varname> kernel command line option is
used it overrides the <varname>ConditionNeedsUpdate=</varname> unit condition checks. In that case
<filename>systemd-update-done.service</filename> will not reset the condition state until a follow-up
reboot where the kernel switch is not specified anymore.</para>
</refsect1>
<refsect1>

7
man/systemd.unit.xml
View File

@ -1294,6 +1294,13 @@
<citerefentry><refentrytitle>systemd-update-done.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
to make sure they run before the stamp file's modification time gets reset indicating a completed
update.</para>
<para>If the <varname>systemd.condition-needs-update=</varname> option is specified on the kernel
command line (taking a boolean), it will override the result of this condition check, taking
precedence over any file modification time checks. If it is used
<filename>systemd-update-done.service</filename> will not have immediate effect on any following
<varname>ConditionNeedsUpdate=</varname> checks, until the system is rebooted where the kernel
command line option is not specified anymore.</para>
</listitem>
</varlistentry>

7
src/shared/condition.c
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@ -548,12 +548,19 @@ static int condition_test_capability(Condition *c, char **env) {
static int condition_test_needs_update(Condition *c, char **env) {
struct stat usr, other;
const char *p;
bool b;
int r;
assert(c);
assert(c->parameter);
assert(c->type == CONDITION_NEEDS_UPDATE);
r = proc_cmdline_get_bool("systemd.condition-needs-update", &b);
if (r < 0)
log_debug_errno(r, "Failed to parse systemd.condition-needs-update= kernel command line argument, ignoring: %m");
if (r > 0)
return b;
if (!path_is_absolute(c->parameter)) {
log_debug("Specified condition parameter '%s' is not absolute, assuming an update is needed.", c->parameter);
return true;