Files: 89903ba2fa42a5bb486607c2b44b9d740697af3b / index.js
10450 bytesRaw
1 | var packCodec = require('js-git/lib/pack-codec') |
2 | var pull = require('pull-stream') |
3 | var cat = require('pull-cat') |
4 | var buffered = require('pull-buffered') |
5 | var pack = require('./lib/pack') |
6 | var pktLine = require('./lib/pkt-line') |
7 | var util = require('./lib/util') |
8 | var multicb = require('multicb') |
9 | |
10 | function handleOption(options, name, value) { |
11 | switch (name) { |
12 | case 'verbosity': |
13 | options.verbosity = +value || 0 |
14 | return true |
15 | case 'progress': |
16 | options.progress = !!value && value !== 'false' |
17 | return true |
18 | default: |
19 | console.error('unknown option', name + ': ' + value) |
20 | return false |
21 | } |
22 | } |
23 | |
24 | function capabilitiesSource() { |
25 | return pull.once([ |
26 | 'option', |
27 | 'connect', |
28 | ].join('\n') + '\n\n') |
29 | } |
30 | |
31 | function optionSource(cmd, options) { |
32 | var args = util.split2(cmd) |
33 | var msg = handleOption(options, args[0], args[1]) |
34 | msg = (msg === true) ? 'ok' |
35 | : (msg === false) ? 'unsupported' |
36 | : 'error ' + msg |
37 | return pull.once(msg + '\n') |
38 | } |
39 | |
40 | // transform ref objects into lines |
41 | function listRefs(read) { |
42 | var ended |
43 | return function (abort, cb) { |
44 | if (ended) return cb(ended) |
45 | read(abort, function (end, ref) { |
46 | ended = end |
47 | if (end === true) cb(null, '\n') |
48 | if (end) cb(end) |
49 | else cb(null, |
50 | [ref.value, ref.name].concat(ref.attrs || []).join(' ') + '\n') |
51 | }) |
52 | } |
53 | } |
54 | |
55 | // upload-pack: fetch to client |
56 | function uploadPack(read, repo, options) { |
57 | /* multi_ack thin-pack side-band side-band-64k ofs-delta shallow no-progress |
58 | * include-tag multi_ack_detailed symref=HEAD:refs/heads/master |
59 | * agent=git/2.7.0 */ |
60 | var refSource = repo.refs.bind(repo) |
61 | var sendRefs = receivePackHeader([ |
62 | ], refSource, false) |
63 | |
64 | var lines = pktLine.decode(read, options) |
65 | var readHave = lines.haves() |
66 | var acked |
67 | var commonHash |
68 | var sendPack |
69 | var wants = {} |
70 | var shallows = {} |
71 | |
72 | // Packfile negotiation |
73 | return cat([ |
74 | pktLine.encode(cat([ |
75 | sendRefs, |
76 | pull.once(''), |
77 | function (abort, cb) { |
78 | if (abort) return |
79 | if (acked) return cb(true) |
80 | |
81 | // read upload request (wants list) from client |
82 | var readWant = lines.wants() |
83 | readWant(null, function (end, want) { |
84 | if (end === true) return // early client disconnect |
85 | else if (end) cb(end) |
86 | else nextWant(null, want) |
87 | }) |
88 | function nextWant(end, want) { |
89 | if (end) return wantsDone(end === true ? null : end) |
90 | if (want.type == 'want') { |
91 | wants[want.hash] = true |
92 | } else if (want.type == 'shallow') { |
93 | shallows[want.hash] = true |
94 | } else { |
95 | var err = new Error("Unknown thing", want.type, want.hash) |
96 | return readWant(err, function (e) { cb(e || err) }) |
97 | } |
98 | readWant(null, nextWant) |
99 | } |
100 | |
101 | function wantsDone(err) { |
102 | if (err) return cb(err) |
103 | // Read upload haves (haves list). |
104 | // On first obj-id that we have, ACK |
105 | // If we have none, NAK. |
106 | // TODO: implement multi_ack_detailed |
107 | readHave(null, function next(end, have) { |
108 | if (end === true) { |
109 | // found no common object |
110 | acked = true |
111 | cb(null, 'NAK') |
112 | } else if (end) |
113 | cb(end) |
114 | else if (have.type != 'have') |
115 | cb(new Error('Unknown have' + JSON.stringify(have))) |
116 | else |
117 | repo.hasObject(have.hash, function (err, haveIt) { |
118 | if (err) return cb(err) |
119 | if (!haveIt) |
120 | return readHave(null, next) |
121 | commonHash = haveIt |
122 | acked = true |
123 | cb(null, 'ACK ' + have.hash) |
124 | }) |
125 | }) |
126 | } |
127 | }, |
128 | ])), |
129 | |
130 | function havesDone(abort, cb) { |
131 | if (abort) return cb(abort) |
132 | // send pack file to client |
133 | if (!sendPack) |
134 | getObjects(repo, commonHash, wants, shallows, |
135 | function (err, numObjects, readObjects) { |
136 | if (err) return cb(err) |
137 | sendPack = pack.encode(numObjects, readObjects) |
138 | havesDone(abort, cb) |
139 | } |
140 | ) |
141 | else |
142 | sendPack(abort, cb) |
143 | } |
144 | ]) |
145 | } |
146 | |
147 | function getObjects(repo, commonHash, heads, shallows, cb) { |
148 | // get objects from commonHash to each head, inclusive. |
149 | // if commonHash is falsy, use root |
150 | var objects = [] |
151 | var objectsAdded = {} |
152 | var done = multicb({pluck: 1}) |
153 | var ended |
154 | |
155 | // walk back from heads until get to commonHash |
156 | for (var hash in heads) |
157 | addObject(hash, done()) |
158 | |
159 | // TODO: only add new objects |
160 | |
161 | function addObject(hash, cb) { |
162 | if (ended) return cb(ended) |
163 | if (hash in objectsAdded || hash == commonHash) return cb() |
164 | objectsAdded[hash] = true |
165 | repo.getObject(hash, function (err, object) { |
166 | if (err) return cb(err) |
167 | if (object.type == 'blob') { |
168 | objects.push(object) |
169 | cb() |
170 | } else { |
171 | // object must be read twice, so buffer it |
172 | bufferObject(object, function (err, object) { |
173 | if (err) return cb(err) |
174 | objects.push(object) |
175 | var hashes = getObjectLinks(object) |
176 | for (var sha1 in hashes) |
177 | addObject(sha1, done()) |
178 | cb() |
179 | }) |
180 | } |
181 | }) |
182 | } |
183 | |
184 | done(function (err) { |
185 | if (err) return cb(err) |
186 | cb(null, objects.length, pull.values(objects)) |
187 | }) |
188 | } |
189 | |
190 | function bufferObject(object, cb) { |
191 | pull( |
192 | object.read, |
193 | pull.collect(function (err, bufs) { |
194 | if (err) return cb(err) |
195 | var buf = Buffer.concat(bufs, object.length) |
196 | cb(null, { |
197 | type: object.type, |
198 | length: object.length, |
199 | data: buf, |
200 | read: pull.once(buf) |
201 | }) |
202 | }) |
203 | ) |
204 | } |
205 | |
206 | // get hashes of git objects linked to from other git objects |
207 | function getObjectLinks(object, cb) { |
208 | switch (object.type) { |
209 | case 'blob': |
210 | return {} |
211 | case 'tree': |
212 | return getTreeLinks(object.data) |
213 | case 'tag': |
214 | case 'commit': |
215 | return getCommitOrTagLinks(object.data) |
216 | } |
217 | } |
218 | |
219 | function getTreeLinks(buf) { |
220 | var links = {} |
221 | for (var i = 0, j; j = buf.indexOf(0, i, 'ascii') + 1; i = j + 20) { |
222 | var hash = buf.slice(j, j + 20).toString('hex') |
223 | if (!(hash in links)) |
224 | links[hash] = true |
225 | } |
226 | return links |
227 | } |
228 | |
229 | function getCommitOrTagLinks(buf) { |
230 | var lines = buf.toString('utf8').split('\n') |
231 | var links = {} |
232 | // iterate until reach blank line (indicating start of commit/tag body) |
233 | for (var i = 0; lines[i]; i++) { |
234 | var args = lines[i].split(' ') |
235 | switch (args[0]) { |
236 | case 'tree': |
237 | case 'parent': |
238 | case 'object': |
239 | var hash = args[1] |
240 | if (!(hash in links)) |
241 | links[hash] = true |
242 | } |
243 | } |
244 | return links |
245 | } |
246 | |
247 | /* |
248 | TODO: investigate capabilities |
249 | report-status delete-refs side-band-64k quiet atomic ofs-delta |
250 | */ |
251 | |
252 | // Get a line for each ref that we have. The first line also has capabilities. |
253 | // Wrap with pktLine.encode. |
254 | function receivePackHeader(capabilities, refSource, usePlaceholder) { |
255 | var first = true |
256 | var ended |
257 | return function (abort, cb) { |
258 | if (ended) return cb(true) |
259 | refSource(abort, function (end, ref) { |
260 | ended = end |
261 | var name = ref && ref.name |
262 | var value = ref && ref.value |
263 | if (first && usePlaceholder) { |
264 | first = false |
265 | if (end) { |
266 | // use placeholder data if there are no refs |
267 | value = '0000000000000000000000000000000000000000' |
268 | name = 'capabilities^{}' |
269 | } |
270 | name += '\0' + capabilities.join(' ') |
271 | } else if (end) { |
272 | return cb(true) |
273 | } |
274 | cb(null, value + ' ' + name) |
275 | }) |
276 | } |
277 | } |
278 | |
279 | // receive-pack: push from client |
280 | function receivePack(read, repo, options) { |
281 | var ended |
282 | var refSource = repo.refs.bind(repo) |
283 | var sendRefs = receivePackHeader([ |
284 | 'delete-refs', |
285 | ], refSource, true) |
286 | |
287 | return pktLine.encode( |
288 | cat([ |
289 | // send our refs |
290 | sendRefs, |
291 | pull.once(''), |
292 | function (abort, cb) { |
293 | if (abort) return |
294 | // receive their refs |
295 | var lines = pktLine.decode(read, options) |
296 | pull( |
297 | lines.updates, |
298 | pull.collect(function (err, updates) { |
299 | if (err) return cb(err) |
300 | repo.update(pull.values(updates), pull( |
301 | lines.passthrough, |
302 | pack.decode(onEnd) |
303 | ), onEnd) |
304 | }) |
305 | ) |
306 | function onEnd(err) { |
307 | if (!ended) |
308 | cb(ended = err) |
309 | } |
310 | }, |
311 | pull.once('unpack ok') |
312 | ]) |
313 | ) |
314 | } |
315 | |
316 | function prepend(data, read) { |
317 | var done |
318 | return function (end, cb) { |
319 | if (done) { |
320 | read(end, cb) |
321 | } else { |
322 | done = true |
323 | cb(null, data) |
324 | } |
325 | } |
326 | } |
327 | |
328 | module.exports = function (repo) { |
329 | var ended |
330 | var options = { |
331 | verbosity: 1, |
332 | progress: false |
333 | } |
334 | |
335 | function handleConnect(cmd, read) { |
336 | var args = util.split2(cmd) |
337 | switch (args[0]) { |
338 | case 'git-upload-pack': |
339 | return prepend('\n', uploadPack(read, repo, options)) |
340 | case 'git-receive-pack': |
341 | return prepend('\n', receivePack(read, repo, options)) |
342 | default: |
343 | return pull.error(new Error('Unknown service ' + args[0])) |
344 | } |
345 | } |
346 | |
347 | function handleCommand(line, read) { |
348 | var args = util.split2(line) |
349 | switch (args[0]) { |
350 | case 'capabilities': |
351 | return capabilitiesSource() |
352 | case 'list': |
353 | return listRefs(refSource) |
354 | case 'connect': |
355 | return handleConnect(args[1], read) |
356 | case 'option': |
357 | return optionSource(args[1], options) |
358 | default: |
359 | return pull.error(new Error('Unknown command ' + line)) |
360 | } |
361 | } |
362 | |
363 | return function (read) { |
364 | var b = buffered() |
365 | b(read) |
366 | var command |
367 | |
368 | function getCommand(cb) { |
369 | b.lines(null, function next(end, line) { |
370 | if (ended = end) |
371 | return cb(end) |
372 | |
373 | if (line == '') |
374 | return b.lines(null, next) |
375 | |
376 | if (options.verbosity > 1) |
377 | console.error('command:', line) |
378 | |
379 | var cmdSource = handleCommand(line, b.passthrough) |
380 | cb(null, cmdSource) |
381 | }) |
382 | } |
383 | |
384 | return function next(abort, cb) { |
385 | if (ended) return cb(ended) |
386 | |
387 | if (!command) { |
388 | if (abort) return |
389 | getCommand(function (end, cmd) { |
390 | command = cmd |
391 | next(end, cb) |
392 | }) |
393 | return |
394 | } |
395 | |
396 | command(abort, function (err, data) { |
397 | if (err) { |
398 | command = null |
399 | if (err !== true) |
400 | cb(err, data) |
401 | else |
402 | next(abort, cb) |
403 | } else { |
404 | cb(null, data) |
405 | } |
406 | }) |
407 | } |
408 | } |
409 | } |
410 |
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