git ssb

1
var fs = require('fs')
2
var proc = require('child_process')
3
var pull = require('pull-stream')
4
var toPull = require('stream-to-pull-stream')
5
var paramap = require('pull-paramap')
6
var multicb = require('multicb')
7
var u = require('./util')
8
var ssbRef = require('ssb-ref')
9
var packidx = require('pull-git-packidx-parser')
10
11
exports.help = `
12
Usage: git ssb find-object [--repo <id>] <sha1>
13
14
  Find a message that introduced the given git object id.
15
  On success, output the message id.
16
17
Arguments:
18
  sha1          git object id to search for
19
20
Options:
21
  --repo <id>   id, url or remote name of git-ssb repo to search within.
22
                default: ssb or origin
23
`
24
25
function getBlob(sbot, id, cb) {
26
  sbot.blobs.size(id, function (err, size) {
27
    if (err) gotBlob(err)
28
    else if (size == null) sbot.blobs.want(id, gotBlob)
29
    else gotBlob(null, true)
30
    function gotBlob(err, got) {
31
      if (!err && !got) err = '???'
32
      if (err) return cb(new Error('failed to get blob ' + id + ': ' + (err.stack||err)))
33
      cb(null, sbot.blobs.get(id))
34
    }
35
  })
36
}
37
38
exports.fn = function (argv) {
39
  if (argv._.length !== 1) return u.help('find-object')
40
41
  var repoId = argv.repo && u.getRemote(argv.repo)
42
  var objId = argv._[0]
43
  if (!/^[0-9a-f]{40}$/.test(objId)) throw 'invalid git object id: ' + objId
44
  var objIdBuf = new Buffer(objId, 'hex')
45
46
  u.getSbot(argv, function (err, sbot) {
47
    if (err) throw err
48
    pull(
49
      u.gitUpdates(sbot, repoId),
50
      pull.map(function (msg) {
51
        var c = msg && msg.value && msg.value.content
52
        return c && Array.isArray(c.indexes) ? c.indexes.map(function (idx) {
53
          if (idx != null && typeof idx === 'object') idx = idx.link
54
          if (typeof idx !== 'string') return
55
          return {msg: msg, idxId: idx}
56
        }).filter(Boolean) : []
57
      }),
58
      pull.flatten(),
59
      paramap(function (info, cb) {
60
        // console.error('getting blob', info.idxId)
61
        getBlob(sbot, info.idxId, function (err, readBlob) {
62
          if (err) throw 'failed to get index blob ' + info.idxId + ': ' + (err.stack || err)
63
          // console.error('parsing packidx', info.idxId)
64
          pull(readBlob, packidx(function (err, idx) {
65
            if (err) throw 'failed to parse index blob ' + info.idxId + ': ' + (err.stack || err)
66
            cb(null, {msg: info.msg, idx: idx})
67
          }))
68
        })
69
      }, 8),
70
      pull.filter(function (info) {
71
        var offset = info.idx.find(objIdBuf)
72
        return offset != null
73
      }),
74
      pull.drain(function (info) {
75
        console.log(info.msg.key)
76
      }, function (err) {
77
        if (err) throw err
78
        sbot.close()
79
      })
80
    )
81
  })
82
}
83