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Diffstat (limited to 'man/systemd.path.xml')
| -rw-r--r-- | man/systemd.path.xml | 379 |
1 files changed, 170 insertions, 209 deletions
diff --git a/man/systemd.path.xml b/man/systemd.path.xml index c6d61cf2b1..71f74d94d6 100644 --- a/man/systemd.path.xml +++ b/man/systemd.path.xml @@ -1,7 +1,7 @@ <?xml version='1.0'?> <!--*-nxml-*--> <?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?> <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" - "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> <!-- This file is part of systemd. @@ -23,213 +23,174 @@ --> <refentry id="systemd.path"> - <refentryinfo> - <title>systemd.path</title> - <productname>systemd</productname> - - <authorgroup> - <author> - <contrib>Developer</contrib> - <firstname>Lennart</firstname> - <surname>Poettering</surname> - <email>lennart@poettering.net</email> - </author> - </authorgroup> - </refentryinfo> - - <refmeta> - <refentrytitle>systemd.path</refentrytitle> - <manvolnum>5</manvolnum> - </refmeta> - - <refnamediv> - <refname>systemd.path</refname> - <refpurpose>Path unit configuration</refpurpose> - </refnamediv> - - <refsynopsisdiv> - <para><filename><replaceable>path</replaceable>.path</filename></para> - </refsynopsisdiv> - - <refsect1> - <title>Description</title> - - <para>A unit configuration file whose name ends in - <literal>.path</literal> encodes information about - a path monitored by systemd, for - path-based activation.</para> - - <para>This man page lists the configuration options - specific to this unit type. See - <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> - for the common options of all unit configuration - files. The common configuration items are configured - in the generic [Unit] and [Install] sections. The - path specific configuration options are configured in - the [Path] section.</para> - - <para>For each path file, a matching unit file must - exist, describing the unit to activate when the path - changes. By default, a service by the same name as the - path (except for the suffix) is activated. Example: a - path file <filename>foo.path</filename> activates a - matching service <filename>foo.service</filename>. The - unit to activate may be controlled by - <varname>Unit=</varname> (see below).</para> - - <para>Internally, path units use the - <citerefentry><refentrytitle>inotify</refentrytitle><manvolnum>7</manvolnum></citerefentry> - API to monitor file systems. Due to that, it suffers by the - same limitations as inotify, and for example cannot be - used to monitor files or directories changed by other - machines on remote NFS file systems.</para> - - <para>If a path unit is beneath another mount - point in the file system hierarchy, a dependency - between both units is created automatically.</para> - - <para>Unless <varname>DefaultDependencies=false</varname> - is used, path units will implicitly have dependencies of - type <varname>Conflicts=</varname> and - <varname>Before=</varname> on - <filename>shutdown.target</filename>. These ensure - that path units are terminated cleanly prior to system - shutdown. Only path units involved with early boot or - late system shutdown should disable this option. - </para> - </refsect1> - - <refsect1> - <title>Options</title> - - <para>Path files must include a [Path] section, - which carries information about the path(s) it - monitors. The options specific to the [Path] section - of path units are the following:</para> - - <variablelist class='unit-directives'> - <varlistentry> - <term><varname>PathExists=</varname></term> - <term><varname>PathExistsGlob=</varname></term> - <term><varname>PathChanged=</varname></term> - <term><varname>PathModified=</varname></term> - <term><varname>DirectoryNotEmpty=</varname></term> - - <listitem><para>Defines paths to - monitor for certain changes: - <varname>PathExists=</varname> may be - used to watch the mere existence of a - file or directory. If the file - specified exists, the configured unit - is - activated. <varname>PathExistsGlob=</varname> - works similar, but checks for the - existence of at least one file - matching the globbing pattern - specified. <varname>PathChanged=</varname> - may be used to watch a file or - directory and activate the configured - unit whenever it changes. It is not - activated on every write to the - watched file but it is activated if - the file which was open for writing - gets - closed. <varname>PathModified=</varname> - is similar, but additionally it is - activated also on simple writes to the - watched file. - <varname>DirectoryNotEmpty=</varname> - may be used to watch a directory and - activate the configured unit whenever - it contains at least one file.</para> - - <para>The arguments of these - directives must be absolute file - system paths.</para> - - <para>Multiple directives may be - combined, of the same and of different - types, to watch multiple paths. If the - empty string is assigned to any of - these options, the list of paths to - watch is reset, and any prior - assignments of these options will not - have any effect.</para> - - <para>If a path already exists - (in case of - <varname>PathExists=</varname> and - <varname>PathExistsGlob=</varname>) or - a directory already is not empty (in - case of - <varname>DirectoryNotEmpty=</varname>) - at the time the path unit is - activated, then the configured unit is - immediately activated as - well. Something similar does not apply - to <varname>PathChanged=</varname> and - <varname>PathModified=</varname>.</para> - - <para>If the path itself or any of the - containing directories are not - accessible, <command>systemd</command> - will watch for permission changes and - notice that conditions are satisfied - when permissions allow that. - </para></listitem> - </varlistentry> - <varlistentry> - <term><varname>Unit=</varname></term> - - <listitem><para>The unit to activate - when any of the configured paths - changes. The argument is a unit name, - whose suffix is not - <literal>.path</literal>. If not - specified, this value defaults to a - service that has the same name as the - path unit, except for the suffix. (See - above.) It is recommended that the - unit name that is activated and the - unit name of the path unit are named - identical, except for the - suffix.</para></listitem> - </varlistentry> - <varlistentry> - <term><varname>MakeDirectory=</varname></term> - - <listitem><para>Takes a boolean - argument. If true, the directories to - watch are created before - watching. This option is ignored for - <varname>PathExists=</varname> - settings. Defaults to - <option>false</option>.</para></listitem> - </varlistentry> - <varlistentry> - <term><varname>DirectoryMode=</varname></term> - - <listitem><para>If - <varname>MakeDirectory=</varname> is - enabled, use the mode specified here to - create the directories in - question. Takes an access mode in - octal notation. Defaults to - <option>0755</option>.</para></listitem> - </varlistentry> - </variablelist> - </refsect1> - - <refsect1> - <title>See Also</title> - <para> - <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, - <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>, - <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>, - <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>, - <citerefentry><refentrytitle>inotify</refentrytitle><manvolnum>7</manvolnum></citerefentry>, - <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry> - </para> - </refsect1> + <refentryinfo> + <title>systemd.path</title> + <productname>systemd</productname> + + <authorgroup> + <author> + <contrib>Developer</contrib> + <firstname>Lennart</firstname> + <surname>Poettering</surname> + <email>lennart@poettering.net</email> + </author> + </authorgroup> + </refentryinfo> + + <refmeta> + <refentrytitle>systemd.path</refentrytitle> + <manvolnum>5</manvolnum> + </refmeta> + + <refnamediv> + <refname>systemd.path</refname> + <refpurpose>Path unit configuration</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <para><filename><replaceable>path</replaceable>.path</filename></para> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para>A unit configuration file whose name ends in + <literal>.path</literal> encodes information about a path + monitored by systemd, for path-based activation.</para> + + <para>This man page lists the configuration options specific to + this unit type. See + <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> + for the common options of all unit configuration files. The common + configuration items are configured in the generic [Unit] and + [Install] sections. The path specific configuration options are + configured in the [Path] section.</para> + + <para>For each path file, a matching unit file must exist, + describing the unit to activate when the path changes. By default, + a service by the same name as the path (except for the suffix) is + activated. Example: a path file <filename>foo.path</filename> + activates a matching service <filename>foo.service</filename>. The + unit to activate may be controlled by <varname>Unit=</varname> + (see below).</para> + + <para>Internally, path units use the + <citerefentry><refentrytitle>inotify</refentrytitle><manvolnum>7</manvolnum></citerefentry> + API to monitor file systems. Due to that, it suffers by the same + limitations as inotify, and for example cannot be used to monitor + files or directories changed by other machines on remote NFS file + systems.</para> + + <para>If a path unit is beneath another mount point in the file + system hierarchy, a dependency between both units is created + automatically.</para> + + <para>Unless <varname>DefaultDependencies=false</varname> is used, + path units will implicitly have dependencies of type + <varname>Conflicts=</varname> and <varname>Before=</varname> on + <filename>shutdown.target</filename>. These ensure that path units + are terminated cleanly prior to system shutdown. Only path units + involved with early boot or late system shutdown should disable + this option. + </para> + </refsect1> + + <refsect1> + <title>Options</title> + + <para>Path files must include a [Path] section, which carries + information about the path(s) it monitors. The options specific to + the [Path] section of path units are the following:</para> + + <variablelist class='unit-directives'> + <varlistentry> + <term><varname>PathExists=</varname></term> + <term><varname>PathExistsGlob=</varname></term> + <term><varname>PathChanged=</varname></term> + <term><varname>PathModified=</varname></term> + <term><varname>DirectoryNotEmpty=</varname></term> + + <listitem><para>Defines paths to monitor for certain changes: + <varname>PathExists=</varname> may be used to watch the mere + existence of a file or directory. If the file specified + exists, the configured unit is activated. + <varname>PathExistsGlob=</varname> works similar, but checks + for the existence of at least one file matching the globbing + pattern specified. <varname>PathChanged=</varname> may be used + to watch a file or directory and activate the configured unit + whenever it changes. It is not activated on every write to the + watched file but it is activated if the file which was open + for writing gets closed. <varname>PathModified=</varname> is + similar, but additionally it is activated also on simple + writes to the watched file. + <varname>DirectoryNotEmpty=</varname> may be used to watch a + directory and activate the configured unit whenever it + contains at least one file.</para> + + <para>The arguments of these directives must be absolute file + system paths.</para> + + <para>Multiple directives may be combined, of the same and of + different types, to watch multiple paths. If the empty string + is assigned to any of these options, the list of paths to + watch is reset, and any prior assignments of these options + will not have any effect.</para> + + <para>If a path already exists (in case of + <varname>PathExists=</varname> and + <varname>PathExistsGlob=</varname>) or a directory already is + not empty (in case of <varname>DirectoryNotEmpty=</varname>) + at the time the path unit is activated, then the configured + unit is immediately activated as well. Something similar does + not apply to <varname>PathChanged=</varname> and + <varname>PathModified=</varname>.</para> + + <para>If the path itself or any of the containing directories + are not accessible, <command>systemd</command> will watch for + permission changes and notice that conditions are satisfied + when permissions allow that. </para></listitem> + </varlistentry> + <varlistentry> + <term><varname>Unit=</varname></term> + + <listitem><para>The unit to activate when any of the + configured paths changes. The argument is a unit name, whose + suffix is not <literal>.path</literal>. If not specified, this + value defaults to a service that has the same name as the path + unit, except for the suffix. (See above.) It is recommended + that the unit name that is activated and the unit name of the + path unit are named identical, except for the + suffix.</para></listitem> + </varlistentry> + <varlistentry> + <term><varname>MakeDirectory=</varname></term> + + <listitem><para>Takes a boolean argument. If true, the + directories to watch are created before watching. This option + is ignored for <varname>PathExists=</varname> settings. + Defaults to <option>false</option>.</para></listitem> + </varlistentry> + <varlistentry> + <term><varname>DirectoryMode=</varname></term> + + <listitem><para>If <varname>MakeDirectory=</varname> is + enabled, use the mode specified here to create the directories + in question. Takes an access mode in octal notation. Defaults + to <option>0755</option>.</para></listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>See Also</title> + <para> + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>inotify</refentrytitle><manvolnum>7</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry> + </para> + </refsect1> </refentry> |