tahoe-lafs/trac-2024-07-25

SFTP: consider supporting hard link extension #1370

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opened 2011-02-24 03:41:44 +00:00 by davidsarah · 2 comments

davidsarah commented

2011-02-24 03:41:44 +00:00

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OpenSSH's SFTP server recently (in version 5.7) added a hardlink extension, and there is a patch to support it in sshfs.

Hardlinks are closer in semantics to the links that Tahoe directories have to their children, than are symlinks. So we might want to support this even though we do not support symlinks (yet).

OpenSSH's SFTP server recently (in version 5.7) added a [hardlink extension](https://bugzilla.mindrot.org/show_bug.cgi?id=1555), and there is a [patch to support it in sshfs](http://sourceforge.net/mailarchive/forum.php?thread_name=20110221103749.GA12166%40miek.nl&forum_name=fuse-sshfs). Hardlinks are closer in semantics to the links that Tahoe directories have to their children, than are symlinks. So we might want to support this even though we do not support symlinks (yet).

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davidsarah commented

2011-02-24 03:53:58 +00:00

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Owner

Update patch link to newer version posted on fuse-sshfs.

davidsarah commented

2011-02-26 01:28:09 +00:00

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Owner

Documentation from http://www.openbsd.org/cgi-bin/cvsweb/~checkout~/src/usr.bin/ssh/PROTOCOL?rev=1.17;content-type=text%2Fplain

10. sftp: Extension request "hardlink@openssh.com"

This request is for creating a hard link to a regular file. This
request is implemented as a SSH_FXP_EXTENDED request with the
following format:

	uint32		id
	string		"hardlink@openssh.com"
	string		oldpath
	string		newpath

On receiving this request the server will perform the operation
link(oldpath, newpath) and will respond with a SSH_FXP_STATUS message.
This extension is advertised in the SSH_FXP_VERSION hello with version
"1".

Documentation from <http://www.openbsd.org/cgi-bin/cvsweb/~checkout~/src/usr.bin/ssh/PROTOCOL?rev=1.17;content-type=text%2Fplain> ``` 10. sftp: Extension request "hardlink@openssh.com" This request is for creating a hard link to a regular file. This request is implemented as a SSH_FXP_EXTENDED request with the following format: uint32 id string "hardlink@openssh.com" string oldpath string newpath On receiving this request the server will perform the operation link(oldpath, newpath) and will respond with a SSH_FXP_STATUS message. This extension is advertised in the SSH_FXP_VERSION hello with version "1". ```

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