Files: 4435fc8900324c433d7c0e31c8a5bda3a5ee53e0 / index.js
14738 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 | 'thin-pack', |
65 | ], repo.refs(), repo.symrefs(), false) |
66 | |
67 | var lines = pktLine.decode(read, options) |
68 | var readWantHave = lines.haves() |
69 | var acked |
70 | var commonHash |
71 | var sendPack |
72 | var wants = {} |
73 | var shallows = {} |
74 | var aborted |
75 | var hasWants |
76 | var gotHaves |
77 | |
78 | function readWant(abort, cb) { |
79 | if (abort) return |
80 | // read upload request (wants list) from client |
81 | readWantHave(null, function next(end, want) { |
82 | if (end || want.type == 'flush-pkt') { |
83 | cb(end || true, cb) |
84 | return |
85 | } |
86 | if (want.type == 'want') { |
87 | wants[want.hash] = true |
88 | hasWants = true |
89 | } else if (want.type == 'shallow') { |
90 | shallows[want.hash] = true |
91 | } else { |
92 | var err = new Error("Unknown thing", want.type, want.hash) |
93 | return readWantHave(err, function (e) { cb(e || err) }) |
94 | } |
95 | readWantHave(null, next) |
96 | }) |
97 | } |
98 | |
99 | function readHave(abort, cb) { |
100 | // Read upload haves (haves list). |
101 | // On first obj-id that we have, ACK |
102 | // If we have none, NAK. |
103 | // TODO: implement multi_ack_detailed |
104 | if (abort) return |
105 | if (gotHaves) return cb(true) |
106 | readWantHave(null, function next(end, have) { |
107 | if (end === true) { |
108 | gotHaves = true |
109 | if (!acked) { |
110 | cb(null, 'NAK') |
111 | } else { |
112 | cb(true) |
113 | } |
114 | } else if (have.type === 'flush-pkt') { |
115 | // found no common object |
116 | if (!acked) { |
117 | cb(null, 'NAK') |
118 | } else { |
119 | readWantHave(null, next) |
120 | } |
121 | } else if (end) |
122 | cb(end) |
123 | else if (have.type != 'have') |
124 | cb(new Error('Unknown have' + JSON.stringify(have))) |
125 | else if (acked) |
126 | readWantHave(null, next) |
127 | else |
128 | repo.hasObjectFromAny(have.hash, function (err, haveIt) { |
129 | if (err) return cb(err) |
130 | if (!haveIt) |
131 | return readWantHave(null, next) |
132 | commonHash = haveIt |
133 | acked = true |
134 | cb(null, 'ACK ' + have.hash) |
135 | }) |
136 | }) |
137 | } |
138 | |
139 | function readPack(abort, cb) { |
140 | if (abort || aborted) return console.error('abrt', abort || aborted), cb(abort || aborted) |
141 | if (sendPack) return sendPack(abort, cb) |
142 | // send pack file to client |
143 | if (!hasWants) return cb(true) |
144 | if (options.verbosity >= 2) { |
145 | console.error('common', commonHash, 'wants', wants) |
146 | } |
147 | // TODO: show progress during getObjects |
148 | getObjects(repo, commonHash, wants, shallows, |
149 | function (err, numObjects, readObjects) { |
150 | if (err) return cb(err) |
151 | // var progress = progressObjects(options) |
152 | // progress.setNumObjects(numObjects) |
153 | sendPack = pack.encode(options, numObjects, readObjects) |
154 | if (options.verbosity >= 1) { |
155 | console.error('retrieving', numObjects, 'git objects') |
156 | } |
157 | sendPack(null, cb) |
158 | } |
159 | ) |
160 | } |
161 | |
162 | // Packfile negotiation |
163 | return cat([ |
164 | pktLine.encode(cat([ |
165 | sendRefs, |
166 | pull.once(''), |
167 | readWant, |
168 | readHave |
169 | ])), |
170 | readPack |
171 | ]) |
172 | } |
173 | |
174 | // through stream to show a progress bar for objects being read |
175 | function progressObjects(options) { |
176 | // Only show progress bar if it is requested and if it won't interfere with |
177 | // the debug output |
178 | if (!options.progress || options.verbosity > 1) { |
179 | var dummyProgress = function (readObject) { return readObject } |
180 | dummyProgress.setNumObjects = function () {} |
181 | return dummyProgress |
182 | } |
183 | |
184 | var numObjects |
185 | var size = process.stderr.columns |
186 | var bar = new ProgressBar(':percent :bar', { |
187 | total: size, |
188 | clear: true |
189 | }) |
190 | |
191 | var progress = function (readObject) { |
192 | return function (abort, cb) { |
193 | readObject(abort, function next(end, object) { |
194 | if (end === true) { |
195 | bar.terminate() |
196 | } else if (!end) { |
197 | var name = object.type + ' ' + object.length |
198 | bar.tick(size / numObjects) |
199 | } |
200 | |
201 | cb(end, object) |
202 | }) |
203 | } |
204 | } |
205 | // TODO: put the num objects in the objects stream as a header object |
206 | progress.setNumObjects = function (n) { |
207 | numObjects = n |
208 | } |
209 | return progress |
210 | } |
211 | |
212 | function getObjects(repo, commonHash, heads, shallows, cb) { |
213 | // get objects from commonHash to each head, inclusive. |
214 | // if commonHash is falsy, use root |
215 | var objects = [] |
216 | var objectsAdded = {} |
217 | var done = multicb({pluck: 1}) |
218 | var ended |
219 | |
220 | // walk back from heads until get to commonHash |
221 | for (var hash in heads) |
222 | addObject(hash, done()) |
223 | |
224 | // TODO: only add new objects |
225 | |
226 | function addObject(hash, cb) { |
227 | if (ended) return cb(ended) |
228 | if (hash in objectsAdded || hash == commonHash) return cb() |
229 | objectsAdded[hash] = true |
230 | repo.getObjectFromAny(hash, function (err, object) { |
231 | if (err) return cb(err) |
232 | if (object.type == 'blob') { |
233 | objects.push(object) |
234 | cb() |
235 | } else { |
236 | // object must be read twice, so buffer it |
237 | bufferObject(object, function (err, object) { |
238 | if (err) return cb(err) |
239 | objects.push(object) |
240 | var hashes = getObjectLinks(object) |
241 | for (var sha1 in hashes) |
242 | addObject(sha1, done()) |
243 | cb() |
244 | }) |
245 | } |
246 | }) |
247 | } |
248 | |
249 | done(function (err) { |
250 | if (err) return cb(err) |
251 | // console.error(objects.reduce(function (n, obj) { return obj.length + n}, 0) + ' bytes') |
252 | cb(null, objects.length, pull.values(objects)) |
253 | }) |
254 | } |
255 | |
256 | function bufferObject(object, cb) { |
257 | pull( |
258 | object.read, |
259 | pull.collect(function (err, bufs) { |
260 | if (err) return cb(err) |
261 | var buf = Buffer.concat(bufs, object.length) |
262 | cb(null, { |
263 | type: object.type, |
264 | length: object.length, |
265 | data: buf, |
266 | read: pull.once(buf) |
267 | }) |
268 | }) |
269 | ) |
270 | } |
271 | |
272 | // get hashes of git objects linked to from other git objects |
273 | function getObjectLinks(object, cb) { |
274 | switch (object.type) { |
275 | case 'blob': |
276 | return {} |
277 | case 'tree': |
278 | return getTreeLinks(object.data) |
279 | case 'tag': |
280 | case 'commit': |
281 | return getCommitOrTagLinks(object.data) |
282 | } |
283 | } |
284 | |
285 | function getTreeLinks(buf) { |
286 | var links = {} |
287 | for (var i = 0, j; j = buf.indexOf(0, i, 'ascii') + 1; i = j + 20) { |
288 | var hash = buf.slice(j, j + 20).toString('hex') |
289 | var mode = parseInt(buf.slice(i, j).toString('ascii'), 8) |
290 | if (mode == 0160000) { |
291 | // skip link to git commit since it may not be in this repo |
292 | continue |
293 | } |
294 | if (!(hash in links)) |
295 | links[hash] = true |
296 | } |
297 | return links |
298 | } |
299 | |
300 | function getCommitOrTagLinks(buf) { |
301 | var lines = buf.toString('utf8').split('\n') |
302 | var links = {} |
303 | // iterate until reach blank line (indicating start of commit/tag body) |
304 | for (var i = 0; lines[i]; i++) { |
305 | var args = lines[i].split(' ') |
306 | switch (args[0]) { |
307 | case 'tree': |
308 | case 'parent': |
309 | case 'object': |
310 | var hash = args[1] |
311 | if (!(hash in links)) |
312 | links[hash] = true |
313 | } |
314 | } |
315 | return links |
316 | } |
317 | |
318 | /* |
319 | TODO: investigate capabilities |
320 | report-status delete-refs side-band-64k quiet atomic ofs-delta |
321 | */ |
322 | |
323 | // Get a line for each ref that we have. The first line also has capabilities. |
324 | // Wrap with pktLine.encode. |
325 | function receivePackHeader(capabilities, refSource, symrefs, usePlaceholder) { |
326 | var first = true |
327 | var symrefed = {} |
328 | var symrefsObj = {} |
329 | |
330 | return cat([ |
331 | function (end, cb) { |
332 | if (end) cb(true) |
333 | else if (!symrefs) cb(true) |
334 | else pull( |
335 | symrefs, |
336 | pull.map(function (sym) { |
337 | symrefed[sym.ref] = true |
338 | symrefsObj[sym.name] = sym.ref |
339 | return 'symref=' + sym.name + ':' + sym.ref |
340 | }), |
341 | pull.collect(function (err, symrefCaps) { |
342 | if (err) return cb(err) |
343 | capabilities = capabilities.concat(symrefCaps) |
344 | cb(true) |
345 | }) |
346 | ) |
347 | }, |
348 | pull( |
349 | refSource, |
350 | pull.map(function (ref) { |
351 | // insert symrefs next to the refs that they point to |
352 | var out = [ref] |
353 | if (ref.name in symrefed) |
354 | for (var symrefName in symrefsObj) |
355 | if (symrefsObj[symrefName] === ref.name) |
356 | out.push({name: symrefName, hash: ref.hash}) |
357 | return out |
358 | }), |
359 | pull.flatten(), |
360 | pull.map(function (ref) { |
361 | var name = ref.name |
362 | var value = ref.hash |
363 | if (first && usePlaceholder) { |
364 | first = false |
365 | /* |
366 | if (end) { |
367 | // use placeholder data if there are no refs |
368 | value = '0000000000000000000000000000000000000000' |
369 | name = 'capabilities^{}' |
370 | } |
371 | */ |
372 | name += '\0' + capabilities.join(' ') |
373 | } |
374 | return value + ' ' + name |
375 | }) |
376 | ) |
377 | ]) |
378 | } |
379 | |
380 | // receive-pack: push from client |
381 | function receivePack(read, repo, options) { |
382 | var sendRefs = receivePackHeader([ |
383 | 'delete-refs', |
384 | 'no-thin', |
385 | ], repo.refs(), null, true) |
386 | var done = multicb({pluck: 1}) |
387 | |
388 | return pktLine.encode( |
389 | cat([ |
390 | // send our refs |
391 | sendRefs, |
392 | pull.once(''), |
393 | function (abort, cb) { |
394 | if (abort) return |
395 | // receive their refs |
396 | var lines = pktLine.decode(read, options) |
397 | pull( |
398 | lines.updates, |
399 | pull.collect(function (err, updates) { |
400 | if (err) return cb(err) |
401 | if (updates.length === 0) return cb(true) |
402 | var progress = progressObjects(options) |
403 | |
404 | var hasPack = !updates.every(function (update) { |
405 | return update.new === null |
406 | }) |
407 | if (!hasPack) { |
408 | return repo.update(pull.values(updates), pull.empty(), done()) |
409 | } |
410 | |
411 | if (repo.uploadPack) { |
412 | var idxCb = done() |
413 | indexPack(lines.passthrough, function (err, idx, packfileFixed) { |
414 | if (err) return idxCb(err) |
415 | repo.uploadPack(pull.values(updates), pull.once({ |
416 | pack: pull( |
417 | packfileFixed, |
418 | // for some reason i was getting zero length buffers which |
419 | // were causing muxrpc to fail, so remove them here. |
420 | pull.filter(function (buf) { |
421 | return buf.length |
422 | }) |
423 | ), |
424 | idx: idx |
425 | }), idxCb) |
426 | }) |
427 | } else { |
428 | repo.update(pull.values(updates), pull( |
429 | lines.passthrough, |
430 | pack.decode({ |
431 | verbosity: options.verbosity, |
432 | onHeader: function (numObjects) { |
433 | progress.setNumObjects(numObjects) |
434 | } |
435 | }, repo, done()), |
436 | progress |
437 | ), done()) |
438 | } |
439 | |
440 | done(function (err) { |
441 | cb(err || true) |
442 | }) |
443 | }) |
444 | ) |
445 | }, |
446 | pull.once('unpack ok') |
447 | ]) |
448 | ) |
449 | } |
450 | |
451 | function prepend(data, read) { |
452 | var done |
453 | return function (end, cb) { |
454 | if (done) { |
455 | read(end, cb) |
456 | } else { |
457 | done = true |
458 | cb(null, data) |
459 | } |
460 | } |
461 | } |
462 | |
463 | module.exports = function (repo) { |
464 | var ended |
465 | var options = { |
466 | verbosity: +process.env.GIT_VERBOSITY || 1, |
467 | progress: false |
468 | } |
469 | |
470 | repo = Repo(repo) |
471 | |
472 | function handleConnect(cmd, read) { |
473 | var args = util.split2(cmd) |
474 | switch (args[0]) { |
475 | case 'git-upload-pack': |
476 | return prepend('\n', uploadPack(read, repo, options)) |
477 | case 'git-receive-pack': |
478 | return prepend('\n', receivePack(read, repo, options)) |
479 | default: |
480 | return pull.error(new Error('Unknown service ' + args[0])) |
481 | } |
482 | } |
483 | |
484 | function handleCommand(line, read) { |
485 | var args = util.split2(line) |
486 | switch (args[0]) { |
487 | case 'capabilities': |
488 | return capabilitiesSource() |
489 | case 'list': |
490 | return listRefs(refSource) |
491 | case 'connect': |
492 | return handleConnect(args[1], read) |
493 | case 'option': |
494 | return optionSource(args[1], options) |
495 | default: |
496 | return pull.error(new Error('Unknown command ' + line)) |
497 | } |
498 | } |
499 | |
500 | return function (read) { |
501 | var b = buffered() |
502 | if (options.verbosity >= 3) { |
503 | read = pull.through(function (data) { |
504 | console.error('>', JSON.stringify(data.toString('ascii'))) |
505 | })(read) |
506 | } |
507 | b(read) |
508 | |
509 | var command |
510 | |
511 | function getCommand(cb) { |
512 | b.lines(null, function next(end, line) { |
513 | if (ended = end) |
514 | return cb(end) |
515 | |
516 | if (line == '') |
517 | return b.lines(null, next) |
518 | |
519 | if (options.verbosity > 1) |
520 | console.error('command:', line) |
521 | |
522 | var cmdSource = handleCommand(line, b.passthrough) |
523 | cb(null, cmdSource) |
524 | }) |
525 | } |
526 | |
527 | return function next(abort, cb) { |
528 | if (ended) return cb(ended) |
529 | |
530 | if (!command) { |
531 | if (abort) return |
532 | getCommand(function (end, cmd) { |
533 | command = cmd |
534 | next(end, cb) |
535 | }) |
536 | return |
537 | } |
538 | |
539 | command(abort, function (err, data) { |
540 | if (err) { |
541 | command = null |
542 | if (err !== true) |
543 | cb(err, data) |
544 | else |
545 | next(abort, cb) |
546 | } else { |
547 | if (options.verbosity >= 3) { |
548 | console.error('<', JSON.stringify(data)) |
549 | } |
550 | cb(null, data) |
551 | } |
552 | }) |
553 | } |
554 | } |
555 | } |
556 |
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