git ssb

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var pull = require('pull-stream')
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var toPull = require('stream-to-pull-stream')
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var cp = require('child_process')
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var fs = require('fs')
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var path = require('path')
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var os = require('os')
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module.exports = function (packFile, cb) {
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  var name = Math.random().toString(36).substr(2)
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  var indexFilename = path.join(os.tmpdir(), name + '.idx')
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  var packFilename = path.join(os.tmpdir(), name + '.pack')
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  var args = ['index-pack', '--stdin', '-o', indexFilename, packFilename]
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  var child = cp.spawn('git', args, {
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    stdio: ['pipe', 'pipe', 'inherit']
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  })
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  pull(packFile, toPull.sink(child.stdin))
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  child.on('close', function (err) {
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    if (err) return cb(err)
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    fs.unlink(packFilename, function (err) {
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      if (err) return cb(err)
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      cb(null, toPull(fs.createReadStream(indexFilename), function (err) {
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        if (err) return console.error(err)
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      }))
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    })
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  })
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}
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