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| author | Lennart Poettering <lennart@poettering.net> | 2010-10-13 02:15:41 +0200 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2010-10-13 02:15:41 +0200 |
| commit | 52661efd21608dc7e0ac26b714a9254ed6180ddb (patch) | |
| tree | 5f64764566711e6a38a664cfc0ee9f9a997e4857 /man/systemd.unit.xml | |
| parent | e04aad61bb5eff117e51631727a3ef2807c75d6b (diff) | |
unit: add minimal condition checker for unit startup
Diffstat (limited to 'man/systemd.unit.xml')
| -rw-r--r-- | man/systemd.unit.xml | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/man/systemd.unit.xml b/man/systemd.unit.xml index e59c1a16c4..e54cafaabc 100644 --- a/man/systemd.unit.xml +++ b/man/systemd.unit.xml @@ -585,6 +585,48 @@ change.</para></listitem> </varlistentry> + <varlistentry> + <term><varname>ConditionPathExists=</varname></term> + <term><varname>ConditionKernelCommandLine=</varname></term> + + <listitem><para>Before starting a unit + verify that the specified condition is + true. With + <varname>ConditionPathExists=</varname> + a file existance condition can be + checked before a unit is started. If + the specified absolute path name does + not exist startup of a unit will not + actually happen, however the unit is + still useful for ordering purposes in + this case. The condition is checked at + the time the queued start job is to be + executed. If the absolute path name + passed to + <varname>ConditionPathExists=</varname> + is prefixed with an exclamation mark + (!), the test is negated, and the unit + only started if the path does not + exist. Similarly + <varname>ConditionKernelCommandLine=</varname> + may be used to check whether a + specific kernel command line option is + set (or if prefixed with the + exclamation mark unset). The argument + must either be a single word, or an + assignment (i.e. two words, seperated + by the equality sign). In the former + case the kernel command line is search + for the word appearing as is, or as + left hand side of an assignment. In + the latter case the exact assignment + is looked for with right and left hand + side matching. If multiple conditions + are specified the unit will be + executed iff at least one of them + apply (i.e. a logical OR is + applied).</para></listitem> + </varlistentry> </variablelist> <para>Unit file may include a [Install] section, which |