Changes between Version 7 and Version 8 of SftpFrontend

Timestamp:

2010-05-29T03:25:38Z (15 years ago)

Author:

davidsarah

Comment:

discuss concurrent writes and snapshotting on read

SftpFrontend

@@ -1 +1 @@
 The SFTP frontend is a server that optionally runs as part of a gateway node, and provides read/write access to the Tahoe grid via the [http://en.wikipedia.org/wiki/SSH_file_transfer_protocol SSH File Transfer Protocol].
 
-See source:docs/frontends/FTP-and-SFTP.txt for how to enable and set up the SFTP frontend on a gateway. This page is for compatibility issues with particular SFTP clients, and assumes that you are using Tahoe-LAFS v1.7.0beta or later.
+See source:docs/frontends/FTP-and-SFTP.txt for how to enable and set up the SFTP frontend on a gateway. This page is for compatibility issues with particular SFTP clients, and assumes that you are using Tahoe-LAFS v1.7.0beta or later. Please add any more issues that you discover.
 
 
@@ -19 +19 @@
 Some applications may make assumptions that are incompatible with Tahoe. For example, 'flushing' a file does not guarantee that written data is reflected in the Tahoe filesystem, so opening the same file via another handle and attempting to read that data before the original handle is closed will not work.
 
+If a file is written via two handles concurrently, the eventual contents will be the data written via one handle or the other, not an interleaving as would be the case for a POSIX filesystem. Also, the contents read via any handle will be a snapshot at about the time of the open. These differences from the POSIX semantics are arguably improvements, but in principle they could confuse some applications.
+
 The MacFUSE version of sshfs stores "extended attributes" in files with names starting with "{{{._}}}". For example the attributes for "{{{foo.txt}}}" would be stored in a file called "{{{._foo.txt}}}". Since some Mac OS X applications may depend on these attributes (especially for their own file formats), if you need to copy or move the original file then you should copy or move the attribute file along with it. The OS X {{{cp}}} and {{{mv}}} commands will do this by default; operations using the Tahoe WUI or CLI will not. Note that filenames beginning with "{{{.}}}" are not listed by default by {{{ls}}}.