mirror of
https://github.com/rclone/rclone.git
synced 2024-12-29 10:29:29 +01:00
119 lines
4.4 KiB
Go
119 lines
4.4 KiB
Go
package vfs
|
|
|
|
// Help contains text describing file and directory caching to add to
|
|
// the command help.
|
|
var Help = `
|
|
### Directory Cache
|
|
|
|
Using the ` + "`--dir-cache-time`" + ` flag, you can set how long a
|
|
directory should be considered up to date and not refreshed from the
|
|
backend. Changes made locally in the mount may appear immediately or
|
|
invalidate the cache. However, changes done on the remote will only
|
|
be picked up once the cache expires.
|
|
|
|
Alternatively, you can send a ` + "`SIGHUP`" + ` signal to rclone for
|
|
it to flush all directory caches, regardless of how old they are.
|
|
Assuming only one rclone instance is running, you can reset the cache
|
|
like this:
|
|
|
|
kill -SIGHUP $(pidof rclone)
|
|
|
|
If you configure rclone with a [remote control](/rc) then you can use
|
|
rclone rc to flush the whole directory cache:
|
|
|
|
rclone rc vfs/forget
|
|
|
|
Or individual files or directories:
|
|
|
|
rclone rc vfs/forget file=path/to/file dir=path/to/dir
|
|
|
|
### File Caching
|
|
|
|
**NB** File caching is **EXPERIMENTAL** - use with care!
|
|
|
|
These flags control the VFS file caching options. The VFS layer is
|
|
used by rclone mount to make a cloud storage system work more like a
|
|
normal file system.
|
|
|
|
You'll need to enable VFS caching if you want, for example, to read
|
|
and write simultaneously to a file. See below for more details.
|
|
|
|
Note that the VFS cache works in addition to the cache backend and you
|
|
may find that you need one or the other or both.
|
|
|
|
--cache-dir string Directory rclone will use for caching.
|
|
--vfs-cache-max-age duration Max age of objects in the cache. (default 1h0m0s)
|
|
--vfs-cache-mode string Cache mode off|minimal|writes|full (default "off")
|
|
--vfs-cache-poll-interval duration Interval to poll the cache for stale objects. (default 1m0s)
|
|
|
|
If run with ` + "`-vv`" + ` rclone will print the location of the file cache. The
|
|
files are stored in the user cache file area which is OS dependent but
|
|
can be controlled with ` + "`--cache-dir`" + ` or setting the appropriate
|
|
environment variable.
|
|
|
|
The cache has 4 different modes selected by ` + "`--vfs-cache-mode`" + `.
|
|
The higher the cache mode the more compatible rclone becomes at the
|
|
cost of using disk space.
|
|
|
|
Note that files are written back to the remote only when they are
|
|
closed so if rclone is quit or dies with open files then these won't
|
|
get written back to the remote. However they will still be in the on
|
|
disk cache.
|
|
|
|
#### --vfs-cache-mode off
|
|
|
|
In this mode the cache will read directly from the remote and write
|
|
directly to the remote without caching anything on disk.
|
|
|
|
This will mean some operations are not possible
|
|
|
|
* Files can't be opened for both read AND write
|
|
* Files opened for write can't be seeked
|
|
* Existing files opened for write must have O_TRUNC set
|
|
* Files open for read with O_TRUNC will be opened write only
|
|
* Files open for write only will behave as if O_TRUNC was supplied
|
|
* Open modes O_APPEND, O_TRUNC are ignored
|
|
* If an upload fails it can't be retried
|
|
|
|
#### --vfs-cache-mode minimal
|
|
|
|
This is very similar to "off" except that files opened for read AND
|
|
write will be buffered to disks. This means that files opened for
|
|
write will be a lot more compatible, but uses the minimal disk space.
|
|
|
|
These operations are not possible
|
|
|
|
* Files opened for write only can't be seeked
|
|
* Existing files opened for write must have O_TRUNC set
|
|
* Files opened for write only will ignore O_APPEND, O_TRUNC
|
|
* If an upload fails it can't be retried
|
|
|
|
#### --vfs-cache-mode writes
|
|
|
|
In this mode files opened for read only are still read directly from
|
|
the remote, write only and read/write files are buffered to disk
|
|
first.
|
|
|
|
This mode should support all normal file system operations.
|
|
|
|
If an upload fails it will be retried up to --low-level-retries times.
|
|
|
|
#### --vfs-cache-mode full
|
|
|
|
In this mode all reads and writes are buffered to and from disk. When
|
|
a file is opened for read it will be downloaded in its entirety first.
|
|
|
|
This may be appropriate for your needs, or you may prefer to look at
|
|
the cache backend which does a much more sophisticated job of caching,
|
|
including caching directory hierarchies and chunks of files.
|
|
|
|
In this mode, unlike the others, when a file is written to the disk,
|
|
it will be kept on the disk after it is written to the remote. It
|
|
will be purged on a schedule according to ` + "`--vfs-cache-max-age`" + `.
|
|
|
|
This mode should support all normal file system operations.
|
|
|
|
If an upload or download fails it will be retried up to
|
|
--low-level-retries times.
|
|
`
|