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Describe use of size=None for deleted files. refs ticket:1710.

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Signed-off-by: Daira Hopwood <daira@jacaranda.org>
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Daira Hopwood 2015-10-25 13:19:13 +00:00
parent 85bcd89f3a
commit 5d2365f6c4
1 changed files with 11 additions and 1 deletions
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12
docs/proposed/magic-folder/remote-to-local-sync.rst
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@ -896,10 +896,20 @@ take this as a signal to rename their copies to the backup filename.
Note that the entry for this zero-length file has a version number as
usual, and later versions may restore the file.
When the downloader deletes a file (or renames it to a filename
ending in ``.backup``) in response to a remote change, a local
filesystem notification will occur, and we must make sure that this
is not treated as a local change. To do this we have the downloader
set the ``size`` field in the magic folder db to ``None`` (SQL NULL)
just before deleting the file, and suppress notifications for which
the local file does not exist, and the recorded ``size`` field is
``None``.
When a Magic Folder client restarts, we can detect files that had
been downloaded but were deleted while it was not running, because
their paths will have last-downloaded records in the magic folder db
without any corresponding local file.
with a ``size`` other than ``None``, and without any corresponding
local file.
Deletion of a directory
~~~~~~~~~~~~~~~~~~~~~~~