skip symlinks with non existing targets

[maage]

I can test this with Linux,

test-notexisting-file.rb

require 'net/scp'

Net::SCP.upload!("localhost", "user",
    "test-dir", "net-scp-test-dir",
    :recursive => true,
    :ssh => {:keys => "~/.ssh/id_rsa", :verbose => :debug}) 

Net::SCP.upload!("localhost", "user",
    "test-dir2", "net-scp-test-dir",
    :recursive => true,
    :ssh => {:keys => "~/.ssh/id_rsa", :verbose => :debug}) 

mkdir test-dir test-dir2
cd test-dir
ln -s /notexisting-file
touch existing-file
cd ../test-dir2
ln -s /notexisting-file
cd ..
bundle exec ruby -Ilib test-notexisting-file.rb

Without this patch I get

/home/user/git/net-scp/lib/net/scp/upload.rb:117:in `stat': No such file or directory - test-dir/notexisting-file (Errno::ENOENT)
        from /home/user/git/net-scp/lib/net/scp/upload.rb:117:in `set_current'
        from /home/user/git/net-scp/lib/net/scp/upload.rb:103:in `next_item_state'
        from /home/user/git/net-scp/lib/net/scp.rb:400:in `await_response_state'
        from /home/user/git/net-scp/lib/net/scp.rb:369:in `block (3 levels) in start_command'
        from /home/user/git/net-scp/vendor/gems/ruby/gems/net-ssh-2.9.2/lib/net/ssh/connection/channel.rb:311:in `call'
        from /home/user/git/net-scp/vendor/gems/ruby/gems/net-ssh-2.9.2/lib/net/ssh/connection/channel.rb:311:in `process'
        from /home/user/git/net-scp/vendor/gems/ruby/gems/net-ssh-2.9.2/lib/net/ssh/connection/session.rb:223:in `block in preprocess'
        from /home/user/git/net-scp/vendor/gems/ruby/gems/net-ssh-2.9.2/lib/net/ssh/connection/session.rb:223:in `each'
        from /home/user/git/net-scp/vendor/gems/ruby/gems/net-ssh-2.9.2/lib/net/ssh/connection/session.rb:223:in `preprocess'
        from /home/user/git/net-scp/vendor/gems/ruby/gems/net-ssh-2.9.2/lib/net/ssh/connection/session.rb:206:in `process'
        from /home/user/git/net-scp/vendor/gems/ruby/gems/net-ssh-2.9.2/lib/net/ssh/connection/session.rb:170:in `block in loop'
        from /home/user/git/net-scp/vendor/gems/ruby/gems/net-ssh-2.9.2/lib/net/ssh/connection/session.rb:170:in `loop'
        from /home/user/git/net-scp/vendor/gems/ruby/gems/net-ssh-2.9.2/lib/net/ssh/connection/session.rb:170:in `loop'
        from /home/user/git/net-scp/vendor/gems/ruby/gems/net-ssh-2.9.2/lib/net/ssh/connection/channel.rb:269:in `wait'
        from /home/user/git/net-scp/lib/net/scp.rb:284:in `upload!'
        from /home/user/git/net-scp/lib/net/scp.rb:227:in `block in upload!'
        from /home/user/git/net-scp/lib/net/scp.rb:207:in `start'
        from /home/user/git/net-scp/lib/net/scp.rb:226:in `upload!'
        from test-notexisting-file.rb:3:in `<main>'

[mfazekas]

@maage sorry for the late reply. Does seems to be a valid issue. Would it worth to add a flag to specify how to upload symlinks?! Should we follow them or ignore them?!