`systemd-tmpfiles-clean.timer` ( 8 )

создает, удаляет и очищает изменчивые и временные файлы и каталоги (Creates, deletes and cleans up volatile and temporary files and directories)

Формат

Имя (Name)

systemd-tmpfiles, systemd-tmpfiles-setup.service, systemd- tmpfiles-setup-dev.service, systemd-tmpfiles-clean.service, systemd-tmpfiles-clean.timer - Creates, deletes and cleans up volatile and temporary files and directories

Синопсис (Synopsis)

systemd-tmpfiles [OPTIONS...] [CONFIGFILE...]

System units:

systemd-tmpfiles-setup.service systemd-tmpfiles-setup-dev.service systemd-tmpfiles-clean.service systemd-tmpfiles-clean.timer

User units:

systemd-tmpfiles-setup.service systemd-tmpfiles-clean.service systemd-tmpfiles-clean.timer

Описание (Description)

systemd-tmpfiles creates, deletes, and cleans up volatile and temporary files and directories, using the configuration file format and location specified in tmpfiles.d(5). It must be invoked with one or more options --create, --remove, and --clean, to select the respective subset of operations.

By default, directives from all configuration files are applied. When invoked with --replace=PATH, arguments specified on the command line are used instead of the configuration file PATH. Otherwise, if one or more absolute filenames are passed on the command line, only the directives in these files are applied. If "-" is specified instead of a filename, directives are read from standard input. If only the basename of a configuration file is specified, all configuration directories as specified in tmpfiles.d(5) are searched for a matching file and the file found that has the highest priority is executed.

System services (systemd-tmpfiles-setup.service, systemd-tmpfiles-setup-dev.service, systemd-tmpfiles-clean.service) invoke systemd-tmpfiles to create system files and to perform system wide cleanup. Those services read administrator-controlled configuration files in tmpfiles.d/ directories. User services (systemd-tmpfiles-setup.service, systemd-tmpfiles-clean.service) also invoke systemd-tmpfiles, but it reads a separate set of files, which includes user-controlled files under ~/.config/user-tmpfiles.d/ and ~/.local/share/user-tmpfiles.d/, and administrator-controlled files under /usr/share/user-tmpfiles.d/. Users may use this to create and clean up files under their control, but the system instance performs global cleanup and is not influenced by user configuration. Note that this means a time-based cleanup configured in the system instance, such as the one typically configured for /tmp/, will thus also affect files created by the user instance if they are placed in /tmp/, even if the user instance's time-based cleanup is turned off.

To re-apply settings after configuration has been modified, simply restart systemd-tmpfiles-clean.service, which will apply any settings which can be safely executed at runtime. To debug systemd-tmpfiles, it may be useful to invoke it directly from the command line with increased log level (see $SYSTEMD_LOG_LEVEL below).

Параметры (Options)

The following options are understood:

       --create
           If this option is passed, all files and directories marked
           with f, F, w, d, D, v, p, L, c, b, m in the configuration
           files are created or written to. Files and directories marked
           with z, Z, t, T, a, and A have their ownership, access mode
           and security labels set.

       --clean
           If this option is passed, all files and directories with an
           age parameter configured will be cleaned up.

       --remove
           If this option is passed, the contents of directories marked
           with D or R, and files or directories themselves marked with
           r or R are removed.

       --user
           Execute "user" configuration, i.e.  tmpfiles.d files in user
           configuration directories.

       --boot
           Also execute lines with an exclamation mark.

       --prefix=path
           Only apply rules with paths that start with the specified
           prefix. This option can be specified multiple times.

       --exclude-prefix=path
           Ignore rules with paths that start with the specified prefix.
           This option can be specified multiple times.

       -E
           A shortcut for "--exclude-prefix=/dev --exclude-prefix=/proc
           --exclude-prefix=/run --exclude-prefix=/sys", i.e. exclude
           the hierarchies typically backed by virtual or memory file
           systems. This is useful in combination with --root=, if the
           specified directory tree contains an OS tree without these
           virtual/memory file systems mounted in, as it is typically
           not desirable to create any files and directories below these
           subdirectories if they are supposed to be overmounted during
           runtime.

       --root=root
           Takes a directory path as an argument. All paths will be
           prefixed with the given alternate root path, including config
           search paths.

           When this option is used, the libc Name Service Switch (NSS)
           is bypassed for resolving users and groups. Instead the files
           /etc/passwd and /etc/group inside the alternate root are read
           directly. This means that users/groups not listed in these
           files will not be resolved, i.e. LDAP NIS and other complex
           databases are not considered.

           Consider combining this with -E to ensure the invocation does
           not create files or directories below mount points in the OS
           image operated on that are typically overmounted during
           runtime.

       --image=image
           Takes a path to a disk image file or block device node. If
           specified all operations are applied to file system in the
           indicated disk image. This is similar to --root= but operates
           on file systems stored in disk images or block devices. The
           disk image should either contain just a file system or a set
           of file systems within a GPT partition table, following the
           Discoverable Partitions Specification[1]. For further
           information on supported disk images, see systemd-nspawn(1)'s
           switch of the same name.

           Implies -E.

       --replace=PATH
           When this option is given, one ore more positional arguments
           must be specified. All configuration files found in the
           directories listed in tmpfiles.d(5) will be read, and the
           configuration given on the command line will be handled
           instead of and with the same priority as the configuration
           file PATH.

           This option is intended to be used when package installation
           scripts are running and files belonging to that package are
           not yet available on disk, so their contents must be given on
           the command line, but the admin configuration might already
           exist and should be given higher priority.

       --cat-config
           Copy the contents of config files to standard output. Before
           each file, the filename is printed as a comment.

       --no-pager
           Do not pipe output into a pager.

       -h, --help
           Print a short help text and exit.

       --version
           Print a short version string and exit.

       It is possible to combine --create, --clean, and --remove in one
       invocation (in which case removal and cleanup are executed before
       creation of new files). For example, during boot the following
       command line is executed to ensure that all temporary and
       volatile directories are removed and created according to the
       configuration file:

           systemd-tmpfiles --remove --create

Окружение (Environment)

$SYSTEMD_LOG_LEVEL The maximum log level of emitted messages (messages with a higher log level, i.e. less important ones, will be suppressed). Either one of (in order of decreasing importance) emerg, alert, crit, err, warning, notice, info, debug, or an integer in the range 0...7. See syslog(3) for more information.

$SYSTEMD_LOG_COLOR A boolean. If true, messages written to the tty will be colored according to priority.

This setting is only useful when messages are written directly to the terminal, because journalctl(1) and other tools that display logs will color messages based on the log level on their own.

$SYSTEMD_LOG_TIME A boolean. If true, console log messages will be prefixed with a timestamp.

This setting is only useful when messages are written directly to the terminal or a file, because journalctl(1) and other tools that display logs will attach timestamps based on the entry metadata on their own.

$SYSTEMD_LOG_LOCATION A boolean. If true, messages will be prefixed with a filename and line number in the source code where the message originates.

Note that the log location is often attached as metadata to journal entries anyway. Including it directly in the message text can nevertheless be convenient when debugging programs.

$SYSTEMD_LOG_TARGET The destination for log messages. One of console (log to the attached tty), console-prefixed (log to the attached tty but with prefixes encoding the log level and "facility", see syslog(3), kmsg (log to the kernel circular log buffer), journal (log to the journal), journal-or-kmsg (log to the journal if available, and to kmsg otherwise), auto (determine the appropriate log target automatically, the default), null (disable log output).

$SYSTEMD_PAGER Pager to use when --no-pager is not given; overrides $PAGER. If neither $SYSTEMD_PAGER nor $PAGER are set, a set of well-known pager implementations are tried in turn, including less(1) and more(1), until one is found. If no pager implementation is discovered no pager is invoked. Setting this environment variable to an empty string or the value "cat" is equivalent to passing --no-pager.

$SYSTEMD_LESS Override the options passed to less (by default "FRSXMK").

Users might want to change two options in particular:

K This option instructs the pager to exit immediately when Ctrl+C is pressed. To allow less to handle Ctrl+C itself to switch back to the pager command prompt, unset this option.

If the value of $SYSTEMD_LESS does not include "K", and the pager that is invoked is less, Ctrl+C will be ignored by the executable, and needs to be handled by the pager.

X This option instructs the pager to not send termcap initialization and deinitialization strings to the terminal. It is set by default to allow command output to remain visible in the terminal even after the pager exits. Nevertheless, this prevents some pager functionality from working, in particular paged output cannot be scrolled with the mouse.

See less(1) for more discussion.

$SYSTEMD_LESSCHARSET Override the charset passed to less (by default "utf-8", if the invoking terminal is determined to be UTF-8 compatible).

$SYSTEMD_PAGERSECURE Takes a boolean argument. When true, the "secure" mode of the pager is enabled; if false, disabled. If $SYSTEMD_PAGERSECURE is not set at all, secure mode is enabled if the effective UID is not the same as the owner of the login session, see geteuid(2) and sd_pid_get_owner_uid(3). In secure mode, LESSSECURE=1 will be set when invoking the pager, and the pager shall disable commands that open or create new files or start new subprocesses. When $SYSTEMD_PAGERSECURE is not set at all, pagers which are not known to implement secure mode will not be used. (Currently only less(1) implements secure mode.)

Note: when commands are invoked with elevated privileges, for example under sudo(8) or pkexec(1), care must be taken to ensure that unintended interactive features are not enabled. "Secure" mode for the pager may be enabled automatically as describe above. Setting SYSTEMD_PAGERSECURE=0 or not removing it from the inherited environment allows the user to invoke arbitrary commands. Note that if the $SYSTEMD_PAGER or $PAGER variables are to be honoured, $SYSTEMD_PAGERSECURE must be set too. It might be reasonable to completely disable the pager using --no-pager instead.

$SYSTEMD_COLORS Takes a boolean argument. When true, systemd and related utilities will use colors in their output, otherwise the output will be monochrome. Additionally, the variable can take one of the following special values: "16", "256" to restrict the use of colors to the base 16 or 256 ANSI colors, respectively. This can be specified to override the automatic decision based on $TERM and what the console is connected to.

$SYSTEMD_URLIFY The value must be a boolean. Controls whether clickable links should be generated in the output for terminal emulators supporting this. This can be specified to override the decision that systemd makes based on $TERM and other conditions.

Операция очистки непривилегированных (Unprivileged - cleanup operation)

systemd-tmpfiles tries to avoid changing the access and modification times on the directories it accesses, which requires CAP_FOWNER privileges. When running as non-root, directories which are checked for files to clean up will have their access time bumped, which might prevent their cleanup.

Статус выхода (Exit)

On success, 0 is returned. If the configuration was syntactically invalid (syntax errors, missing arguments, ...), so some lines had to be ignored, but no other errors occurred, 65 is returned (EX_DATAERR from /usr/include/sysexits.h). If the configuration was syntactically valid, but could not be executed (lack of permissions, creation of files in missing directories, invalid contents when writing to /sys/ values, ...), 73 is returned (EX_CANTCREAT from /usr/include/sysexits.h). Otherwise, 1 is returned (EXIT_FAILURE from /usr/include/stdlib.h).

Note: when creating items, if the target already exists, but is of the wrong type or otherwise does not match the requested state, and forced operation has not been requested with "+", a message is emitted, but the failure is otherwise ignored.

Смотри также (See also)

systemd(1), tmpfiles.d(5)

Примечание (Note)

1. Discoverable Partitions Specification https://systemd.io/DISCOVERABLE_PARTITIONS

Исходный текст на man7.org

systemd-tmpfiles-clean.timer ( 8 )