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POIs there a better way to check file size using SCP before downloading?
 

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  1. POIs there a better way to check file size using SCP before downloading?
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    <p>I have this code to download a file from a remote machine, but I want to limit it to files that are less than 5MB.</p> <p>So far the code works. but is there a better way to check the filesize before downloading?</p> <pre><code>Net::SCP.start(hname, uname, :password =&gt; pw ) do|scp| fsize=scp.download!("#{remdir}/#{filname}").size;puts fsize scp.download!("#{remdir}/#{filname}", "#{filname}") do |ch, name, sent, total| File.open(lfile, 'a'){ |f| f.puts "#{name}: #{(sent.to_f * 100 / total.to_f).to_i}% complete"} #puts "Sending : #{(sent.to_f * 100 / total.to_f).to_i}% complete" #puts "#{name}: #{sent}/#{total}" #print "\r#{name}: #{(sent.to_f * 100 / total.to_f).to_i}%" end end </code></pre> <p>Does this cause any problem if I am use it for large files?</p> <pre><code>fsize=scp.download!("#{remdir}/#{filname}").size;puts fsize </code></pre> <p>This page says the file will be returned as a string: <a href="http://ruby.about.com/od/ssh/ss/netscp_6.htm" rel="nofollow">http://ruby.about.com/od/ssh/ss/netscp_6.htm</a></p> <p><strong>Update</strong>: I tried SFTP aswell. first it did not work for full path to file. and secondly it did not do what i wanted. so was using scp.download!().size. i know i am doing the download twice :(</p> <pre><code>require 'net/sftp' # did not take full path "/user/myname/filename" remote_path="somefile.txt" Net::SFTP.start(hname, uname, :password =&gt; pw) do |sftp| attrs = sftp.stat!("rome_desc.txt") ; puts attrs # gave # ☼ ↨?% (? '→ ??Q{ ?Qt;? sftp.stat!(remote_path) do |response| puts response #returned no such file (2) # but did not do below upload operation. unless response.ok? sftp.upload!("#{filname}", remdir) end end end </code></pre> <p><strong>Update:2 Solution</strong> found the solution using the the comments provided from below users and after searching the net.</p> <pre><code> Net::SFTP.start(hname, uname, :password =&gt; pw) do |sftp| #, :verbose =&gt; Logger::DEBUG sftp.dir.glob("./#{remdir}", "#{filname}") do |entry| p entry.name file_size=entry.attributes.size; file_size = '%.2f' % (("#{file_size}").to_f / 2**20) ; File.open(lfile, 'a'){ |f| f.puts "File size is #{file_size} mb"} if file_size &lt; file_size_param then sftp.download!("#{remdir}/#{filname}", filname) else File.open(lfile, 'a'){ |f| f.puts "File size is greater than #{file_size_param} mb. so can not Download File"} end end end </code></pre> <p>used .attributes.size to obtain the file size and perform the download operation by checking the filesize.</p> <pre><code> sftp.dir.glob("./#{remdir}", "#{filname}") do |entry| p entry.name file_size=entry.attributes.size </code></pre>
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