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Full Discussion: File locking (Unix/Linux) & sftp
Top Forums Shell Programming and Scripting File locking (Unix/Linux) & sftp Post 302374958 by soodoo on Thursday 26th of November 2009 03:56:44 AM
Old 11-26-2009
File locking (Unix/Linux) & sftp
Hi all,

Can anyone help ...on how to ensure that a file is locked .

thanks & regards,
Soodoo
----------------------------------------

Problem description: -

We usually use the mv command in scripts to make sure that a file is complete and not being written to by another process.

If the mv is successful, we are confident that we can copy/ftp/process the file in confidence.

Based on tests conducted, we found that a mv on AIX will be successful even if a sftp of the file is under way.

Kindly note that we made sure that both source and destination directories were on the same file system (so that the mv would be a move and not a copy operation).

To make matters worse, a rm of a file that is being sftp'ed also worked. That is the rm command completed successfully, even before the sftp had completed, and at the end of the sftp, the file was just not there anymore!


NB: AIX version 6.1
sfp (Bitwise) 4.23
 

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LEARN ABOUT MINIX

sftp-server

sftp-server(1M) 					  System Administration Commands					   sftp-server(1M)

NAME

       sftp-server - SFTP server subsystem

SYNOPSIS

       /usr/lib/ssh/sftp-server

DESCRIPTION

       sftp-server implements the server side of the SSH File Transfer Protocol as defined in the IETF draft-ietf-secsh-filexfer.

       sftp-server is a subsystem for sshd(1M) and must not be run directly. There are no options or config settings.

       To enable the sftp-server subsystem for sshd add the following to /etc/ssh/sshd_config:

       Subsystem   sftp     /usr/lib/ssh/sftp-server

       See sshd_config(4) for a description of the format and contents of that file.

       There is no relationship between the protocol used by sftp-server and the FTP protocol (RFC 959) provided by in.ftpd.

EXIT STATUS

       The following exit values are returned:

       0	Successful completion.

       >0	An error occurred.

FILES

       /usr/lib/sftp-server

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWsshdu 		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       sftp(1), ssh(1), ssh-add(1), ssh-keygen(1), sshd(1M), sshd_config(4), attributes(5)

       To  view  license  terms,  attribution,	and  copyright	for OpenSSH, the default path is /var/sadm/pkg/SUNWsshdr/install/copyright. If the
       Solaris operating environment has been installed anywhere other than the default, modify the given path to access the file at the installed
       location.

AUTHOR

       Markus Friedl

SunOS 5.10							    30 Jul 2003 						   sftp-server(1M)
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