From 52661efd21608dc7e0ac26b714a9254ed6180ddb Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Wed, 13 Oct 2010 02:15:41 +0200 Subject: unit: add minimal condition checker for unit startup --- man/systemd.unit.xml | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) (limited to 'man') 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. + + ConditionPathExists= + ConditionKernelCommandLine= + + Before starting a unit + verify that the specified condition is + true. With + ConditionPathExists= + 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 + ConditionPathExists= + is prefixed with an exclamation mark + (!), the test is negated, and the unit + only started if the path does not + exist. Similarly + ConditionKernelCommandLine= + 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). + Unit file may include a [Install] section, which -- cgit v1.2.3-54-g00ecf