Exec': String Contains Null Byte (Argumenterror)

`exec': string contains null byte (ArgumentError)

Your cmd string has got a null (i.e. zero) byte in it somehow. Using puts won’t show up any null bytes, they’ll just be left out of the output:

1.8.7 :001 > exec "\0"
ArgumentError: string contains null byte
        from (irb):1:in `exec'
        from (irb):1
1.8.7 :002 > puts "n\0n"
nn
 => nil 

You should probably check how your rep, svn_user and pxs variables are being populated to see if you can track down the source of these null bytes, but as a quick fix you could use gsub! to remove them:

cmd.gsub!(/\0/, '')

ArgumentError: string contains null byte when writing Marshalled data into a file

The order of the file name and content argument is reversed. The first argument must be the name and the second one the content. The argument error is raised because file names shouldn't contain null bytes.

And since you're dealing with binary data, you should use IO.binwrite:

File.binwrite "users.txt", Marshal.dump(users)

Can't run logstash. pathname contains null byte

it seems you have non-printing character in your config file.
check with cat -vET /usr/share/logstash/bin/logstash.conf

Write string with null characters to stdin of program

This is not a ruby-specific problem. Arguments on a nix system are passed as null-terminated strings (see exec(2) for more details). That means null characters are the one type of characters arguments to any command can't have. You'll need to think of a way of passing the null-containing message in a different way than via arguments. (stdin would probably be the simplest alternative).

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