Files: 89d4ea002ce8eba46b2a851392339309844af851 / index.js
14770 bytesRaw
1 | var pull = require('pull-stream') |
2 | var cat = require('pull-cat') |
3 | var cache = require('pull-cache') |
4 | var buffered = require('pull-buffered') |
5 | var Repo = require('pull-git-repo') |
6 | var pack = require('pull-git-pack') |
7 | var pktLine = require('./lib/pkt-line') |
8 | var indexPack = require('pull-git-pack/lib/index-pack') |
9 | var util = require('./lib/util') |
10 | var multicb = require('multicb') |
11 | var ProgressBar = require('progress') |
12 | |
13 | function handleOption(options, name, value) { |
14 | switch (name) { |
15 | case 'verbosity': |
16 | options.verbosity = +value || 0 |
17 | return true |
18 | case 'progress': |
19 | options.progress = !!value && value !== 'false' |
20 | return true |
21 | default: |
22 | console.error('unknown option', name + ': ' + value) |
23 | return false |
24 | } |
25 | } |
26 | |
27 | function capabilitiesSource() { |
28 | return pull.once([ |
29 | 'option', |
30 | 'connect', |
31 | ].join('\n') + '\n\n') |
32 | } |
33 | |
34 | function optionSource(cmd, options) { |
35 | var args = util.split2(cmd) |
36 | var msg = handleOption(options, args[0], args[1]) |
37 | msg = (msg === true) ? 'ok' |
38 | : (msg === false) ? 'unsupported' |
39 | : 'error ' + msg |
40 | return pull.once(msg + '\n') |
41 | } |
42 | |
43 | // transform ref objects into lines |
44 | function listRefs(read) { |
45 | var ended |
46 | return function (abort, cb) { |
47 | if (ended) return cb(ended) |
48 | read(abort, function (end, ref) { |
49 | ended = end |
50 | if (end === true) cb(null, '\n') |
51 | if (end) cb(end) |
52 | else cb(null, |
53 | [ref.value, ref.name].concat(ref.attrs || []).join(' ') + '\n') |
54 | }) |
55 | } |
56 | } |
57 | |
58 | // upload-pack: fetch to client |
59 | function uploadPack(read, repo, options) { |
60 | /* multi_ack thin-pack side-band side-band-64k ofs-delta shallow no-progress |
61 | * include-tag multi_ack_detailed |
62 | * agent=git/2.7.0 */ |
63 | var sendRefs = receivePackHeader([ |
64 | ], repo.refs(), repo.symrefs()) |
65 | |
66 | var lines = pktLine.decode(read, { |
67 | onCaps: onCaps, |
68 | verbosity: options.verbosity |
69 | }) |
70 | var readWantHave = lines.haves() |
71 | var acked |
72 | var commonHash |
73 | var sendPack |
74 | var wants = {} |
75 | var shallows = {} |
76 | var aborted |
77 | var hasWants |
78 | var gotHaves |
79 | |
80 | function onCaps(caps) { |
81 | } |
82 | |
83 | function readWant(abort, cb) { |
84 | if (abort) return |
85 | // read upload request (wants list) from client |
86 | readWantHave(null, function next(end, want) { |
87 | if (end || want.type == 'flush-pkt') { |
88 | cb(end || true, cb) |
89 | return |
90 | } |
91 | if (want.type == 'want') { |
92 | wants[want.hash] = true |
93 | hasWants = true |
94 | } else if (want.type == 'shallow') { |
95 | shallows[want.hash] = true |
96 | } else { |
97 | var err = new Error("Unknown thing", want.type, want.hash) |
98 | return readWantHave(err, function (e) { cb(e || err) }) |
99 | } |
100 | readWantHave(null, next) |
101 | }) |
102 | } |
103 | |
104 | function readHave(abort, cb) { |
105 | // Read upload haves (haves list). |
106 | // On first obj-id that we have, ACK |
107 | // If we have none, NAK. |
108 | // TODO: implement multi_ack_detailed |
109 | // FIXME! |
110 | if (abort) return |
111 | if (gotHaves) return cb(true) |
112 | readWantHave(null, function next(end, have) { |
113 | if (end === true) { |
114 | gotHaves = true |
115 | if (!acked) { |
116 | cb(null, 'NAK') |
117 | } else { |
118 | cb(true) |
119 | } |
120 | } else if (have.type === 'flush-pkt') { |
121 | // found no common object |
122 | if (!acked) { |
123 | cb(null, 'NAK') |
124 | } else { |
125 | readWantHave(null, next) |
126 | } |
127 | } else if (end) |
128 | cb(end) |
129 | else if (have.type != 'have') |
130 | cb(new Error('Unknown have' + JSON.stringify(have))) |
131 | else if (acked) |
132 | readWantHave(null, next) |
133 | else |
134 | repo.hasObjectFromAny(have.hash, function (err, haveIt) { |
135 | if (err) return cb(err) |
136 | if (!haveIt) |
137 | return readWantHave(null, next) |
138 | commonHash = haveIt |
139 | acked = true |
140 | cb(null, 'ACK ' + have.hash) |
141 | }) |
142 | }) |
143 | } |
144 | |
145 | function readPack(abort, cb) { |
146 | if (abort || aborted) return console.error('abrt', abort || aborted), cb(abort || aborted) |
147 | if (sendPack) return sendPack(abort, cb) |
148 | // send pack file to client |
149 | if (!hasWants) return cb(true) |
150 | if (options.verbosity >= 2) { |
151 | console.error('common', commonHash, 'wants', wants) |
152 | } |
153 | // TODO: show progress during getObjects |
154 | getObjects(repo, commonHash, wants, shallows, |
155 | function (err, numObjects, readObjects) { |
156 | if (err) return cb(err) |
157 | // var progress = progressObjects(options) |
158 | // progress.setNumObjects(numObjects) |
159 | sendPack = pack.encode(options, numObjects, readObjects) |
160 | if (options.verbosity >= 1) { |
161 | console.error('retrieving', numObjects, 'git objects') |
162 | } |
163 | sendPack(null, cb) |
164 | } |
165 | ) |
166 | } |
167 | |
168 | // Packfile negotiation |
169 | return cat([ |
170 | pktLine.encode(cat([ |
171 | sendRefs, |
172 | pull.once(''), |
173 | readWant, |
174 | readHave |
175 | ])), |
176 | readPack |
177 | ]) |
178 | } |
179 | |
180 | // through stream to show a progress bar for objects being read |
181 | function progressObjects(options) { |
182 | // Only show progress bar if it is requested and if it won't interfere with |
183 | // the debug output |
184 | if (!options.progress || options.verbosity > 1) { |
185 | var dummyProgress = function (readObject) { return readObject } |
186 | dummyProgress.setNumObjects = function () {} |
187 | return dummyProgress |
188 | } |
189 | |
190 | var numObjects |
191 | var size = process.stderr.columns |
192 | var bar = new ProgressBar(':percent :bar', { |
193 | total: size, |
194 | clear: true |
195 | }) |
196 | |
197 | var progress = function (readObject) { |
198 | return function (abort, cb) { |
199 | readObject(abort, function next(end, object) { |
200 | if (end === true) { |
201 | bar.terminate() |
202 | } else if (!end) { |
203 | var name = object.type + ' ' + object.length |
204 | bar.tick(size / numObjects) |
205 | } |
206 | |
207 | cb(end, object) |
208 | }) |
209 | } |
210 | } |
211 | // TODO: put the num objects in the objects stream as a header object |
212 | progress.setNumObjects = function (n) { |
213 | numObjects = n |
214 | } |
215 | return progress |
216 | } |
217 | |
218 | function getObjects(repo, commonHash, heads, shallows, cb) { |
219 | // get objects from commonHash to each head, inclusive. |
220 | // if commonHash is falsy, use root |
221 | var objects = [] |
222 | var objectsAdded = {} |
223 | var done = multicb({pluck: 1}) |
224 | var ended |
225 | |
226 | // walk back from heads until get to commonHash |
227 | for (var hash in heads) |
228 | addObject(hash, done()) |
229 | |
230 | // TODO: only add new objects |
231 | |
232 | function addObject(hash, cb) { |
233 | if (ended) return cb(ended) |
234 | if (hash in objectsAdded || hash == commonHash) return cb() |
235 | objectsAdded[hash] = true |
236 | repo.getObjectFromAny(hash, function (err, object) { |
237 | if (err) return cb(err) |
238 | if (object.type == 'blob') { |
239 | objects.push(object) |
240 | cb() |
241 | } else { |
242 | // object must be read twice, so buffer it |
243 | bufferObject(object, function (err, object) { |
244 | if (err) return cb(err) |
245 | objects.push(object) |
246 | var hashes = getObjectLinks(object) |
247 | for (var sha1 in hashes) |
248 | addObject(sha1, done()) |
249 | cb() |
250 | }) |
251 | } |
252 | }) |
253 | } |
254 | |
255 | done(function (err) { |
256 | if (err) return cb(err) |
257 | // console.error(objects.reduce(function (n, obj) { return obj.length + n}, 0) + ' bytes') |
258 | cb(null, objects.length, pull.values(objects)) |
259 | }) |
260 | } |
261 | |
262 | function bufferObject(object, cb) { |
263 | pull( |
264 | object.read, |
265 | pull.collect(function (err, bufs) { |
266 | if (err) return cb(err) |
267 | var buf = Buffer.concat(bufs, object.length) |
268 | cb(null, { |
269 | type: object.type, |
270 | length: object.length, |
271 | data: buf, |
272 | read: pull.once(buf) |
273 | }) |
274 | }) |
275 | ) |
276 | } |
277 | |
278 | // get hashes of git objects linked to from other git objects |
279 | function getObjectLinks(object, cb) { |
280 | switch (object.type) { |
281 | case 'blob': |
282 | return {} |
283 | case 'tree': |
284 | return getTreeLinks(object.data) |
285 | case 'tag': |
286 | case 'commit': |
287 | return getCommitOrTagLinks(object.data) |
288 | } |
289 | } |
290 | |
291 | function getTreeLinks(buf) { |
292 | var links = {} |
293 | for (var i = 0, j; j = buf.indexOf(0, i, 'ascii') + 1; i = j + 20) { |
294 | var hash = buf.slice(j, j + 20).toString('hex') |
295 | var mode = parseInt(buf.slice(i, j).toString('ascii'), 8) |
296 | if (mode == 0160000) { |
297 | // skip link to git commit since it may not be in this repo |
298 | continue |
299 | } |
300 | if (!(hash in links)) |
301 | links[hash] = true |
302 | } |
303 | return links |
304 | } |
305 | |
306 | function getCommitOrTagLinks(buf) { |
307 | var lines = buf.toString('utf8').split('\n') |
308 | var links = {} |
309 | // iterate until reach blank line (indicating start of commit/tag body) |
310 | for (var i = 0; lines[i]; i++) { |
311 | var args = lines[i].split(' ') |
312 | switch (args[0]) { |
313 | case 'tree': |
314 | case 'parent': |
315 | case 'object': |
316 | var hash = args[1] |
317 | if (!(hash in links)) |
318 | links[hash] = true |
319 | } |
320 | } |
321 | return links |
322 | } |
323 | |
324 | /* |
325 | TODO: investigate capabilities |
326 | report-status delete-refs side-band-64k quiet atomic ofs-delta |
327 | */ |
328 | |
329 | // Get a line for each ref that we have. The first line also has capabilities. |
330 | // Wrap with pktLine.encode. |
331 | function receivePackHeader(capabilities, refSource, symrefs) { |
332 | var first = true |
333 | var symrefed = {} |
334 | var symrefsObj = {} |
335 | |
336 | return cat([ |
337 | function (end, cb) { |
338 | if (end) cb(true) |
339 | else if (!symrefs) cb(true) |
340 | else pull( |
341 | symrefs, |
342 | pull.map(function (sym) { |
343 | symrefed[sym.ref] = true |
344 | symrefsObj[sym.name] = sym.ref |
345 | return 'symref=' + sym.name + ':' + sym.ref |
346 | }), |
347 | pull.collect(function (err, symrefCaps) { |
348 | if (err) return cb(err) |
349 | capabilities = capabilities.concat(symrefCaps) |
350 | cb(true) |
351 | }) |
352 | ) |
353 | }, |
354 | pull( |
355 | refSource, |
356 | pull.map(function (ref) { |
357 | // insert symrefs next to the refs that they point to |
358 | var out = [ref] |
359 | if (ref.name in symrefed) |
360 | for (var symrefName in symrefsObj) |
361 | if (symrefsObj[symrefName] === ref.name) |
362 | out.push({name: symrefName, hash: ref.hash}) |
363 | return out |
364 | }), |
365 | pull.flatten(), |
366 | pull.map(function (ref) { |
367 | var name = ref.name |
368 | var value = ref.hash |
369 | if (first) { |
370 | first = false |
371 | /* |
372 | if (end) { |
373 | // use placeholder data if there are no refs |
374 | value = '0000000000000000000000000000000000000000' |
375 | name = 'capabilities^{}' |
376 | } |
377 | */ |
378 | name += '\0' + capabilities.join(' ') |
379 | } |
380 | return value + ' ' + name |
381 | }) |
382 | ) |
383 | ]) |
384 | } |
385 | |
386 | // receive-pack: push from client |
387 | function receivePack(read, repo, options) { |
388 | var sendRefs = receivePackHeader([ |
389 | 'delete-refs', |
390 | 'no-thin', |
391 | ], repo.refs(), null) |
392 | var done = multicb({pluck: 1}) |
393 | |
394 | return pktLine.encode( |
395 | cat([ |
396 | // send our refs |
397 | sendRefs, |
398 | pull.once(''), |
399 | function (abort, cb) { |
400 | if (abort) return |
401 | // receive their refs |
402 | var lines = pktLine.decode(read, options) |
403 | pull( |
404 | lines.updates, |
405 | pull.collect(function (err, updates) { |
406 | if (err) return cb(err) |
407 | if (updates.length === 0) return cb(true) |
408 | var progress = progressObjects(options) |
409 | |
410 | var hasPack = !updates.every(function (update) { |
411 | return update.new === null |
412 | }) |
413 | if (!hasPack) { |
414 | return repo.update(pull.values(updates), pull.empty(), done()) |
415 | } |
416 | |
417 | if (repo.uploadPack) { |
418 | var idxCb = done() |
419 | indexPack(lines.passthrough, function (err, idx, packfileFixed) { |
420 | if (err) return idxCb(err) |
421 | repo.uploadPack(pull.values(updates), pull.once({ |
422 | pack: pull( |
423 | packfileFixed, |
424 | // for some reason i was getting zero length buffers which |
425 | // were causing muxrpc to fail, so remove them here. |
426 | pull.filter(function (buf) { |
427 | return buf.length |
428 | }) |
429 | ), |
430 | idx: idx |
431 | }), idxCb) |
432 | }) |
433 | } else { |
434 | repo.update(pull.values(updates), pull( |
435 | lines.passthrough, |
436 | pack.decode({ |
437 | verbosity: options.verbosity, |
438 | onHeader: function (numObjects) { |
439 | progress.setNumObjects(numObjects) |
440 | } |
441 | }, repo, done()), |
442 | progress |
443 | ), done()) |
444 | } |
445 | |
446 | done(function (err) { |
447 | cb(err || true) |
448 | }) |
449 | }) |
450 | ) |
451 | }, |
452 | pull.once('unpack ok') |
453 | ]) |
454 | ) |
455 | } |
456 | |
457 | function prepend(data, read) { |
458 | var done |
459 | return function (end, cb) { |
460 | if (done) { |
461 | read(end, cb) |
462 | } else { |
463 | done = true |
464 | cb(null, data) |
465 | } |
466 | } |
467 | } |
468 | |
469 | module.exports = function (repo) { |
470 | var ended |
471 | var options = { |
472 | verbosity: +process.env.GIT_VERBOSITY || 1, |
473 | progress: false |
474 | } |
475 | |
476 | repo = Repo(repo) |
477 | |
478 | function handleConnect(cmd, read) { |
479 | var args = util.split2(cmd) |
480 | switch (args[0]) { |
481 | case 'git-upload-pack': |
482 | return prepend('\n', uploadPack(read, repo, options)) |
483 | case 'git-receive-pack': |
484 | return prepend('\n', receivePack(read, repo, options)) |
485 | default: |
486 | return pull.error(new Error('Unknown service ' + args[0])) |
487 | } |
488 | } |
489 | |
490 | function handleCommand(line, read) { |
491 | var args = util.split2(line) |
492 | switch (args[0]) { |
493 | case 'capabilities': |
494 | return capabilitiesSource() |
495 | case 'list': |
496 | return listRefs(refSource) |
497 | case 'connect': |
498 | return handleConnect(args[1], read) |
499 | case 'option': |
500 | return optionSource(args[1], options) |
501 | default: |
502 | return pull.error(new Error('Unknown command ' + line)) |
503 | } |
504 | } |
505 | |
506 | return function (read) { |
507 | var b = buffered() |
508 | if (options.verbosity >= 3) { |
509 | read = pull.through(function (data) { |
510 | console.error('>', JSON.stringify(data.toString('ascii'))) |
511 | })(read) |
512 | } |
513 | b(read) |
514 | |
515 | var command |
516 | |
517 | function getCommand(cb) { |
518 | b.lines(null, function next(end, line) { |
519 | if (ended = end) |
520 | return cb(end) |
521 | |
522 | if (line == '') |
523 | return b.lines(null, next) |
524 | |
525 | if (options.verbosity > 1) |
526 | console.error('command:', line) |
527 | |
528 | var cmdSource = handleCommand(line, b.passthrough) |
529 | cb(null, cmdSource) |
530 | }) |
531 | } |
532 | |
533 | return function next(abort, cb) { |
534 | if (ended) return cb(ended) |
535 | |
536 | if (!command) { |
537 | if (abort) return |
538 | getCommand(function (end, cmd) { |
539 | command = cmd |
540 | next(end, cb) |
541 | }) |
542 | return |
543 | } |
544 | |
545 | command(abort, function (err, data) { |
546 | if (err) { |
547 | command = null |
548 | if (err !== true) |
549 | cb(err, data) |
550 | else |
551 | next(abort, cb) |
552 | } else { |
553 | if (options.verbosity >= 3) { |
554 | console.error('<', JSON.stringify(data)) |
555 | } |
556 | cb(null, data) |
557 | } |
558 | }) |
559 | } |
560 | } |
561 | } |
562 |
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