:permissions attribute and umask

[mcarpenter]

I'm trying to use :permissions with #mkdir but the results
are affected by umask and I can't see a way to set that via the API.

Client:

• ubuntu 10.10
• ruby 1.8.7 (stock ubuntu)
• net/ssh 2.1.4
• net/sftp 2.0.5

(net/sftp, net/ssh installed by rubygems, ubuntu stock libnet-ssh-ruby
and libnet-sftp-ruby packages not installed)

Server:

• local or remote ubuntu or solaris, stock sshd
• umask 027

Minimal test:

Net::SFTP.start( 'localhost', ENV['USER'] ) do |sftp|
  sftp.mkdir!( '/tmp/mydir', :permissions => 0560 )
end

Results:

0560 as above, gives:
dr-xr----- 2 martin martin 4096 2011-05-05 06:07 /tmp/mydir
(0540)

0666 gives:
drw-r----- 2 martin martin 4096 2011-05-05 06:09 /tmp/mydir
(0640)

0777 gives:
drwxr-x--- 2 martin martin 4096 2011-05-05 06:10 /tmp/mydir
(0750)

[mcarpenter]

I'm going to close my own issue. I don't particularly like it, but it's not the fault of net-sftp.

The call to #mkdir! issues an SSH_FXP_MKDIR packet. Upon receipt of this the sftp-server (I checked OpenSSH source) performs a mkdir(2). The mode parameter to that system call is interpreted in the context of the sftp-server's umask (settable system wide with the -u flag to OpenSSH's sftp-server).

This is in contrast to userland command mkdir(1), which ignores umask (and which one uses directly more often than mkdir(2)...). Workaround: #setstat can set file permissions explicitly (analogous to chmod(2)) after directory creation.

[delano]

Thanks for the follow up on the issue by the way. And my apologies for the delay in replying.