178 lines
7.4 KiB
Go
178 lines
7.4 KiB
Go
package vfs
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// Help contains text describing file and directory caching to add to
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// the command help.
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var Help = `
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### Directory Cache
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Using the ` + "`--dir-cache-time`" + ` flag, you can set how long a
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directory should be considered up to date and not refreshed from the
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backend. Changes made locally in the mount may appear immediately or
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invalidate the cache. However, changes done on the remote will only
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be picked up once the cache expires if the backend configured does not
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support polling for changes. If the backend supports polling, changes
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will be picked up on within the polling interval.
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Alternatively, you can send a ` + "`SIGHUP`" + ` signal to rclone for
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it to flush all directory caches, regardless of how old they are.
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Assuming only one rclone instance is running, you can reset the cache
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like this:
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kill -SIGHUP $(pidof rclone)
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If you configure rclone with a [remote control](/rc) then you can use
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rclone rc to flush the whole directory cache:
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rclone rc vfs/forget
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Or individual files or directories:
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rclone rc vfs/forget file=path/to/file dir=path/to/dir
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### File Buffering
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The ` + "`--buffer-size`" + ` flag determines the amount of memory,
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that will be used to buffer data in advance.
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Each open file descriptor will try to keep the specified amount of
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data in memory at all times. The buffered data is bound to one file
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descriptor and won't be shared between multiple open file descriptors
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of the same file.
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This flag is a upper limit for the used memory per file descriptor.
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The buffer will only use memory for data that is downloaded but not
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not yet read. If the buffer is empty, only a small amount of memory
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will be used.
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The maximum memory used by rclone for buffering can be up to
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` + "`--buffer-size * open files`" + `.
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### File Caching
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These flags control the VFS file caching options. The VFS layer is
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used by rclone mount to make a cloud storage system work more like a
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normal file system.
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You'll need to enable VFS caching if you want, for example, to read
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and write simultaneously to a file. See below for more details.
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Note that the VFS cache works in addition to the cache backend and you
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may find that you need one or the other or both.
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--cache-dir string Directory rclone will use for caching.
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--vfs-cache-max-age duration Max age of objects in the cache. (default 1h0m0s)
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--vfs-cache-mode string Cache mode off|minimal|writes|full (default "off")
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--vfs-cache-poll-interval duration Interval to poll the cache for stale objects. (default 1m0s)
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--vfs-cache-max-size int Max total size of objects in the cache. (default off)
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If run with ` + "`-vv`" + ` rclone will print the location of the file cache. The
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files are stored in the user cache file area which is OS dependent but
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can be controlled with ` + "`--cache-dir`" + ` or setting the appropriate
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environment variable.
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The cache has 4 different modes selected by ` + "`--vfs-cache-mode`" + `.
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The higher the cache mode the more compatible rclone becomes at the
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cost of using disk space.
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Note that files are written back to the remote only when they are
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closed so if rclone is quit or dies with open files then these won't
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get written back to the remote. However they will still be in the on
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disk cache.
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If using --vfs-cache-max-size note that the cache may exceed this size
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for two reasons. Firstly because it is only checked every
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--vfs-cache-poll-interval. Secondly because open files cannot be
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evicted from the cache.
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#### --vfs-cache-mode off
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In this mode the cache will read directly from the remote and write
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directly to the remote without caching anything on disk.
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This will mean some operations are not possible
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* Files can't be opened for both read AND write
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* Files opened for write can't be seeked
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* Existing files opened for write must have O_TRUNC set
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* Files open for read with O_TRUNC will be opened write only
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* Files open for write only will behave as if O_TRUNC was supplied
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* Open modes O_APPEND, O_TRUNC are ignored
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* If an upload fails it can't be retried
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#### --vfs-cache-mode minimal
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This is very similar to "off" except that files opened for read AND
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write will be buffered to disks. This means that files opened for
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write will be a lot more compatible, but uses the minimal disk space.
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These operations are not possible
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* Files opened for write only can't be seeked
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* Existing files opened for write must have O_TRUNC set
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* Files opened for write only will ignore O_APPEND, O_TRUNC
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* If an upload fails it can't be retried
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#### --vfs-cache-mode writes
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In this mode files opened for read only are still read directly from
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the remote, write only and read/write files are buffered to disk
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first.
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This mode should support all normal file system operations.
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If an upload fails it will be retried up to --low-level-retries times.
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#### --vfs-cache-mode full
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In this mode all reads and writes are buffered to and from disk. When
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a file is opened for read it will be downloaded in its entirety first.
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This may be appropriate for your needs, or you may prefer to look at
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the cache backend which does a much more sophisticated job of caching,
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including caching directory hierarchies and chunks of files.
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In this mode, unlike the others, when a file is written to the disk,
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it will be kept on the disk after it is written to the remote. It
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will be purged on a schedule according to ` + "`--vfs-cache-max-age`" + `.
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This mode should support all normal file system operations.
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If an upload or download fails it will be retried up to
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--low-level-retries times.
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### Case Sensitivity
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Linux file systems are case-sensitive: two files can differ only
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by case, and the exact case must be used when opening a file.
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Windows is not like most other operating systems supported by rclone.
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File systems in modern Windows are case-insensitive but case-preserving:
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although existing files can be opened using any case, the exact case used
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to create the file is preserved and available for programs to query.
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It is not allowed for two files in the same directory to differ only by case.
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Usually file systems on MacOS are case-insensitive. It is possible to make MacOS
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file systems case-sensitive but that is not the default
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The "--vfs-case-insensitive" mount flag controls how rclone handles these
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two cases. If its value is "false", rclone passes file names to the mounted
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file system as is. If the flag is "true" (or appears without a value on
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command line), rclone may perform a "fixup" as explained below.
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The user may specify a file name to open/delete/rename/etc with a case
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different than what is stored on mounted file system. If an argument refers
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to an existing file with exactly the same name, then the case of the existing
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file on the disk will be used. However, if a file name with exactly the same
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name is not found but a name differing only by case exists, rclone will
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transparently fixup the name. This fixup happens only when an existing file
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is requested. Case sensitivity of file names created anew by rclone is
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controlled by an underlying mounted file system.
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Note that case sensitivity of the operating system running rclone (the target)
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may differ from case sensitivity of a file system mounted by rclone (the source).
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The flag controls whether "fixup" is performed to satisfy the target.
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If the flag is not provided on command line, then its default value depends
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on the operating system where rclone runs: "true" on Windows and MacOS, "false"
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otherwise. If the flag is provided without a value, then it is "true".
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`
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