Pipe processing to extract tar buffer in Node.js Child Processes

Question

Pipe processing to extract tar buffer in Node.js Child Processes

I would like to do this by Node.js:

git archive remote=git@example.com:repo.git HEAD | tar -x - -C /path/to/extracted/

So, I wrote codes something like this:

git = spawn 'git', ['archive', "--remote=git@example.com:repo.git", 'HEAD']
tar = spawn 'tar', ['-x', '-', '-C /path/to/extracted']

git.stderr.on 'data', (data) ->
  console.log "git error: #{data}"

git.stdout.on 'data', (data) ->
  tar.stdin.write data

tar.stderr.on 'data', (data) ->
  console.log "tar error: #{data}"

git.on 'exit', (code) ->
  console.log "git process done with code #{code}"

tar.on 'exit', (code) ->
  console.log "tar process done with code #{code}"

However this doesn't work as I expected. What should I change to make this work properly?

Thanks in advance.

UPDATE

Proper command actually doesn't need - between -x and -C

git archive remote=git@example.com:repo.git HEAD | tar -x -C /path/to/extracted/

node.js
pipe
child-process

Answer 1

You should use the function exec and not spawn in that case. As seen in the exec documenation it accepts pipes exec documentation

exec('git archive remote=git@example.com:repo.git HEAD | tar -x - -C /path/to/extracted/', function (error, stdout, stderr) {
    // logic here
}