相当于bash管道标准输出重定向的Node.js

Question

I am having this command I use to get the contents inside a git repository:

git archive --remote=ssh://git@git/repository.git HEAD filename.txt | tar xvOf -

The first part of the command returns the contents of filename.txt inside the repository to the standard output. The second part is there in order to remove the pax_global_header that git automatically adds to the contents.

I want to implement this command as a spawned child_process on node.js v0.10.36

Here is what I've tried:

var git = spawn("git",  ["archive","--remote=" + repositoryUrl,"HEAD",filename]);
var tar = spawn("tar", ["xvOf", "-"]);
var out = [];
tar.stdout.pipe(git.stdout).on('data', function(data){
        var string = data.toString();
        if(string) {
            out.push(string);
        }
    });

but when I run this, the strings I get inside the data handler are like the git output never gets piped through the tar process

What am I doing wrong?

Answer 1

I figured out the answer 10 seconds after posting this...

What I should do was pipe the output of git to the input of tar and work with the streams outputted by tar

So my code looks somewhat like this:

    var git = spawn("git",  ["archive","--remote=" + repositoryUrl,"HEAD",filename]);
    var tar = spawn("tar", ["xvOf", "-"]);

    var out = [];
    git.stdout.pipe(tar.stdin);

    tar.stdout.on('data', function(data){
        var string = data.toString();
        if(string) {
            out.push(string);
        }
    });
....