X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=man%2Fsystemd.unit.xml;h=032879a0afdea99327c7f9598dc9b6274e6a9b09;hp=4dc427c305bcd5e9a7bae1e241d1eba9437728eb;hb=8d0e0ddda6501479eb69164687c83c1a7667b33a;hpb=613b411c947635136637f8cdd66b94512f761eab diff --git a/man/systemd.unit.xml b/man/systemd.unit.xml index 4dc427c30..032879a0a 100644 --- a/man/systemd.unit.xml +++ b/man/systemd.unit.xml @@ -70,7 +70,8 @@ ... - $HOME/.config/systemd/user/* + $XDG_CONFIG_HOME/systemd/user/* +$HOME/.config/systemd/user/* /etc/systemd/user/* /run/systemd/user/* /usr/lib/systemd/user/* @@ -120,6 +121,17 @@ systemd.scope5. + Various settings are allowed to be specified + more than once, in which case the interpretation + depends on the setting. Often, multiple settings form + a list, and setting to an empty value "resets", which + means that previous assignments are ignored. When this + is allowed, it is mentioned in the description of the + setting. Note that using multiple assignments to the + same value makes the unit file incompatible with + parsers for the XDG .desktop file + format. + Unit files are loaded from a set of paths determined during compilation, described in the next section. @@ -127,10 +139,12 @@ Unit files may contain additional options on top of those listed here. If systemd encounters an unknown option, it will write a warning log message but - continue loading the unit. If an option is prefixed - with , it is ignored completely by - systemd. Applications may use this to include - additional information in the unit files. + continue loading the unit. If an option or section name + is prefixed with , it is ignored + completely by systemd. Options within an ignored + section do not need the prefix. Applications may use + this to include additional information in the unit + files. Boolean arguments used in unit files can be written in various formats. For positive settings the @@ -189,12 +203,6 @@ has the appropriate section headers before any directive. - If a line starts with - followed by a filename, the specified file will be - parsed at this point. Make sure that the file that is - included has the appropriate section headers before - any directives. - Note that while systemd offers a flexible dependency system between units it is recommended to use this functionality only sparingly and instead rely @@ -221,7 +229,7 @@ multiple units from a single configuration file. If systemd looks for a unit configuration file, it will first search for the literal unit name in the - filesystem. If that yields no success and the unit + file system. If that yields no success and the unit name contains an @ character, systemd will look for a unit template that shares the same name but with the instance string (i.e. the part between the @ character @@ -314,9 +322,13 @@ + + $XDG_CONFIG_HOME/systemd/user + User configuration (only used when $XDG_CONFIG_HOME is set) + $HOME/.config/systemd/user - User configuration + User configuration (only used when $XDG_CONFIG_HOME is not set) /etc/systemd/user @@ -345,7 +357,7 @@ - Options + [Unit] Section Options Unit file may include a [Unit] section, which carries generic information about the unit that is not @@ -392,7 +404,7 @@ what the unit's purpose is, followed by how it is configured, followed by any other related documentation. This - option may be specified more than once + option may be specified more than once, in which case the specified list of URIs is merged. If the empty string is assigned to this option, the list is @@ -410,10 +422,12 @@ of the other units gets deactivated or its activation fails, this unit will be deactivated. This option may be - specified more than once, in which - case requirement dependencies for all - listed names are created. Note that - requirement dependencies do not + specified more than once or multiple + space-separated units may be specified + in one option in which case + requirement dependencies for all + listed names will be created. Note + that requirement dependencies do not influence the order in which services are started or stopped. This has to be configured independently with the @@ -476,23 +490,24 @@ RequisiteOverridable= Similar to - Requires= - and RequiresOverridable=, respectively. However, - if a unit listed here is not started - already it will not be started and the - transaction fails - immediately. + Requires= and + RequiresOverridable=, + respectively. However, if the units + listed here are not started already, + they will not be started and the + transaction will fail immediately. + Wants= A weaker version of - Requires=. A unit + Requires=. Units listed in this option will be started if the configuring unit is. However, - if the listed unit fails to start up - or cannot be added to the transaction + if the listed units fail to start + or cannot be added to the transaction, this has no impact on the validity of the transaction as a whole. This is the recommended way to hook start-up @@ -501,11 +516,11 @@ Note that dependencies of this type may also be configured outside of - the unit configuration file by - adding a symlink to a + the unit configuration file by adding + symlinks to a .wants/ directory accompanying the unit file. For - details see above. + details, see above. @@ -514,7 +529,7 @@ Configures requirement dependencies, very similar in style to Requires=, however - in addition to this behavior it also + in addition to this behavior, it also declares that this unit is stopped when any of the units listed suddenly disappears. Units can suddenly, @@ -534,7 +549,7 @@ of units. When systemd stops or restarts the units listed here, the action is propagated to this unit. - Note that this is a one way dependency - + Note that this is a one-way dependency — changes to this unit do not affect the listed units. @@ -543,12 +558,12 @@ Conflicts= - Configures negative + A space-separated list + of unit names. Configures negative requirement dependencies. If a unit - has a - Conflicts= setting - on another unit, starting the former - will stop the latter and vice + has a Conflicts= + setting on another unit, starting the + former will stop the latter and vice versa. Note that this setting is independent of and orthogonal to the After= and @@ -563,9 +578,9 @@ be modified to be fixed (in case one or both jobs are not a required part of the transaction). In the latter - case the job that is not the required + case, the job that is not the required will be removed, or in case both are - not required the unit that conflicts + not required, the unit that conflicts will be started and the unit that is conflicted is stopped. @@ -575,7 +590,8 @@ Before= After= - Configures ordering + A space-separated list + of unit names. Configures ordering dependencies between units. If a unit foo.service contains a setting @@ -591,7 +607,7 @@ a common pattern to include a unit name in both the After= and - Requires= option in + Requires= option, in which case the unit listed will be started before the unit that is configured with these options. This @@ -619,23 +635,23 @@ dependency on another unit is shut down while the latter is started up, the shut down is ordered before the - start-up regardless whether the + start-up regardless of whether the ordering dependency is actually of type After= or Before=. If two units have no ordering dependencies - between them, they are shut down - or started up simultaneously, and - no ordering takes + between them, they are shut down or + started up simultaneously, and no + ordering takes place. OnFailure= - Lists one or more - units that are activated when this - unit enters the + A space-separated list + of one or more units that are + activated when this unit enters the failed state. @@ -644,16 +660,17 @@ PropagatesReloadTo= ReloadPropagatedFrom= - Lists one or more - units where reload requests on the - unit will be propagated to/on the - other unit will be propagated - from. Issuing a reload request on a - unit will automatically also enqueue a - reload request on all units that the - reload request shall be propagated to - via these two - settings. + A space-separated list + of one or more units where reload + requests on this unit will be + propagated to, or reload requests on + the other unit will be propagated to + this unit, respectively. Issuing a + reload request on a unit will + automatically also enqueue a reload + request on all units that the reload + request shall be propagated to via + these two settings. @@ -670,13 +687,13 @@ directives (see systemd.exec5 for details). If a unit that has this - setting set is started its processes + setting set is started, its processes will see the same /tmp, /tmp/var and network namespace as one listed unit that is started. If multiple listed - units are already started it is not + units are already started, it is not defined which namespace is joined. Note that this setting only has an effect if @@ -690,13 +707,26 @@ RequiresMountsFor= - Takes a space-separated - list of absolute paths. Automatically - adds dependencies of type - Requires= and - After= for all + Takes a + space-separated list of absolute + paths. Automatically adds dependencies + of type Requires= + and After= for all mount units required to access the - specified path. + specified path. + + Mount points marked with + are not + mounted automatically and will be + ignored for the purposes of this + option. If such a mount should be a + requirement for this unit, + direct dependencies on the mount + units may be added + (Requires= and + After= or + some other combination). + @@ -863,6 +893,13 @@ + ConditionArchitecture= + ConditionVirtualization= + ConditionHost= + ConditionKernelCommandLine= + ConditionSecurity= + ConditionCapability= + ConditionACPower= ConditionPathExists= ConditionPathExistsGlob= ConditionPathIsDirectory= @@ -872,12 +909,6 @@ ConditionDirectoryNotEmpty= ConditionFileNotEmpty= ConditionFileIsExecutable= - ConditionKernelCommandLine= - ConditionVirtualization= - ConditionSecurity= - ConditionCapability= - ConditionHost= - ConditionACPower= ConditionNull= Before starting a unit @@ -892,93 +923,46 @@ queued start job is to be executed. - With - ConditionPathExists= - a file existence condition is - checked before a unit is started. If - the specified absolute path name does - not exist, the condition will - fail. If the absolute path name passed - to - ConditionPathExists= - is prefixed with an exclamation mark - (!), the test is negated, and the unit - is only started if the path does not - exist. - - ConditionPathExistsGlob= - is similar to - ConditionPathExists=, - but checks for the existence of at - least one file or directory matching - the specified globbing pattern. - - ConditionPathIsDirectory= - is similar to - ConditionPathExists= - but verifies whether a certain path - exists and is a - directory. - - ConditionPathIsSymbolicLink= - is similar to - ConditionPathExists= - but verifies whether a certain path - exists and is a symbolic - link. - - ConditionPathIsMountPoint= - is similar to - ConditionPathExists= - but verifies whether a certain path - exists and is a mount - point. - - ConditionPathIsReadWrite= - is similar to - ConditionPathExists= - but verifies whether the underlying - file system is readable and writable - (i.e. not mounted - read-only). - - ConditionDirectoryNotEmpty= - is similar to - ConditionPathExists= - but verifies whether a certain path - exists and is a non-empty - directory. - - ConditionFileNotEmpty= - is similar to - ConditionPathExists= - but verifies whether a certain path - exists and refers to a regular file - with a non-zero size. - - ConditionFileIsExecutable= - is similar to - ConditionPathExists= - but verifies whether a certain path - exists, is a regular file and marked - executable. - - Similar, - 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, separated - =). In the former - case the kernel command line is - searched 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. + ConditionArchitecture= + may be used to check whether the + system is running on a specific + architecture. Takes one of + x86, + x86-64, + ppc, + ppc64, + ia64, + parisc, + parisc64, + s390, + s390x, + sparc, + sparc64, + mips, + mips64, + alpha, + arm, + arm-be, + arm64, + arm64-be, + sh, + sh64, + m86k to test + against a specific architecture. The + architecture is determined from the + information returned by + uname2 + and is thus subject to + personality2. Note + that a Personality= + setting in the same unit file has no + effect on this condition. A special + architecture name + native is mapped to + the architecture the system manager + itself is compiled for. The test may + be negated by prepending an + exclamation mark. ConditionVirtualization= may be used to check whether the @@ -1012,6 +996,36 @@ test may be negated by prepending an exclamation mark. + ConditionHost= + may be used to match against the + hostname or machine ID of the + host. This either takes a hostname + string (optionally with shell style + globs) which is tested against the + locally set hostname as returned by + gethostname2, + or a machine ID formatted as string + (see + machine-id5). + The test may be negated by prepending + an exclamation mark. + + 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, separated + =). In the former + case the kernel command line is + searched 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. + ConditionSecurity= may be used to check whether the given security module is enabled on the @@ -1037,20 +1051,6 @@ possibly prefixed with an exclamation mark to negate the check. - ConditionHost= - may be used to match against the - hostname or machine ID of the - host. This either takes a hostname - string (optionally with shell style - globs) which is tested against the - locally set hostname as returned by - gethostname2, - or a machine ID formatted as string - (see - machine-id5). - The test may be negated by prepending - an exclamation mark. - ConditionACPower= may be used to check whether the system has AC power, or is exclusively @@ -1068,6 +1068,77 @@ all AC connectors are disconnected from a power source. + With + ConditionPathExists= + a file existence condition is + checked before a unit is started. If + the specified absolute path name does + not exist, the condition will + fail. If the absolute path name passed + to + ConditionPathExists= + is prefixed with an exclamation mark + (!), the test is negated, and the unit + is only started if the path does not + exist. + + ConditionPathExistsGlob= + is similar to + ConditionPathExists=, + but checks for the existence of at + least one file or directory matching + the specified globbing pattern. + + ConditionPathIsDirectory= + is similar to + ConditionPathExists= + but verifies whether a certain path + exists and is a + directory. + + ConditionPathIsSymbolicLink= + is similar to + ConditionPathExists= + but verifies whether a certain path + exists and is a symbolic + link. + + ConditionPathIsMountPoint= + is similar to + ConditionPathExists= + but verifies whether a certain path + exists and is a mount + point. + + ConditionPathIsReadWrite= + is similar to + ConditionPathExists= + but verifies whether the underlying + file system is readable and writable + (i.e. not mounted + read-only). + + ConditionDirectoryNotEmpty= + is similar to + ConditionPathExists= + but verifies whether a certain path + exists and is a non-empty + directory. + + ConditionFileNotEmpty= + is similar to + ConditionPathExists= + but verifies whether a certain path + exists and refers to a regular file + with a non-zero size. + + ConditionFileIsExecutable= + is similar to + ConditionPathExists= + but verifies whether a certain path + exists, is a regular file and marked + executable. + Finally, ConditionNull= may be used to add a constant condition @@ -1110,12 +1181,17 @@ useful for implementation of generator tools that convert configuration from an external configuration file format - into native unit files. Thus + into native unit files. This functionality should not be used in normal units. + + + + [Install] Section Options + Unit file may include a [Install] section, which carries installation information for the unit. This section is not interpreted by @@ -1130,32 +1206,34 @@ Alias= - Additional names this - unit shall be installed under. The - names listed here must have the same - suffix (i.e. type) as the unit file - name. This option may be specified - more than once, in which case all - listed names are used. At installation - time, - systemctl enable - will create symlinks from these names - to the unit filename. + A space-seperated list + of additional names this unit shall be + installed under. The names listed here + must have the same suffix (i.e. type) + as the unit file name. This option may + be specified more than once, in which + case all listed names are used. At + installation time, systemctl + enable will create symlinks + from these names to the unit + filename. WantedBy= RequiredBy= - A symbolic link is - created in the - .wants/ or - .requires/ directory - of the listed unit when this unit is - activated by systemctl - enable. This has the effect - that a dependency of type - Wants= or + This option may be + used more than once, or a + space-separated list of unit names may + be given. A symbolic link is created + in the .wants/ or + .requires/ + directory of each of the listed units + when this unit is installed by + systemctl enable. + This has the effect that a dependency + of type Wants= or Requires= is added from the listed unit to the current unit. The primary result is that the @@ -1201,7 +1279,25 @@ and systemctl disable will automatically install/uninstall units listed in this option as - well. + well. + + This option may be used more + than once, or a space-separated list + of unit names may be + given. + + + + DefaultInstance= + + In template unit files, + this specifies for which instance the + unit shall be enabled if the template + is enabled without any explicitly set + instance. This option has no effect in + non-template unit files. The specified + string must be usable as instance + identifier. @@ -1242,55 +1338,52 @@ %N Unescaped full unit name - + Same as %n, but with escaping undone %p Prefix name - For instantiated units this refers to the string before the @. For non-instantiated units this refers to to the name of the unit with the type suffix removed. + For instantiated units, this refers to the string before the @ character of the unit name. For non-instantiated units, this refers to the name of the unit with the type suffix removed. %P Unescaped prefix name - + Same as %p, but with escaping undone %i Instance name - For instantiated units: this is the string between the @ character and the suffix. + For instantiated units: this is the string between the @ character and the suffix of the unit name. %I Unescaped instance name - + Same as %i, but with escaping undone %f Unescaped filename - This is either the unescaped instance name (if applicable) with / prepended (if applicable), or the prefix name similarly prepended with /. + This is either the unescaped instance name (if applicable) with / prepended (if applicable), or the prefix name prepended with /. %c Control group path of the unit - + This path does not include the /sys/fs/cgroup/systemd/ prefix. %r - Root control group path where units are placed. - For system instances, this usually resolves to /system, except in containers, where the path might be prefixed with the container's root control group. + Control group path of the slice the unit is placed in + This usually maps to the parent cgroup path of %c. %R - Parent directory of the control group path where units are placed. - For system instances, this usually - resolves to /, except in - containers, where this resolves to the - container's root directory. + Root control group path below which slices and units are placed + For system instances, this resolves to /, except in containers, where this maps to the container's root control group path. %t - Runtime socket dir - This is either /run (for the system manager) or $XDG_RUNTIME_DIR (for user managers). + Runtime directory + This is either /run (for the system manager) or the path $XDG_RUNTIME_DIR resolves to (for user managers). %u @@ -1300,17 +1393,17 @@ %U User UID - This is the UID of the configured user of the unit, or (if none is set) the user running the systemd instance. + This is the numeric UID of the configured user of the unit, or (if none is set) the user running the systemd user instance. Note that this specifier is not available for units run by the systemd system instance (as opposed to those run by a systemd user instance), unless the user has been configured as a numeric UID in the first place or the configured user is the root user. %h User home directory - This is the home directory of the configured user of the unit, or (if none is set) the user running the systemd instance. + This is the home directory of the configured user of the unit, or (if none is set) the user running the systemd user instance. Similar to %U, this specifier is not available for units run by the systemd system instance, unless the configured user is the root user. %s User shell - This is the shell of the configured user of the unit, or (if none is set) the user running the systemd instance. If the user is root (UID equal to 0), the shell configured in account database is ignored and /bin/sh is always used. + This is the shell of the configured user of the unit, or (if none is set) the user running the systemd user instance. Similar to %U, this specifier is not available for units run by the systemd system instance, unless the configured user is the root user. %m @@ -1325,17 +1418,17 @@ %H Host name - The hostname of the running system. + The hostname of the running system at the point in time the unit configuation is loaded. %v Kernel release - Identical to uname -r output. + Identical to uname -r output %% - Escaped % - Single percent sign. + Single percent sign + Use %% in place of % to specify a single percent sign.