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0+

cel / pull-git-remote-helper



Commit 6198d3e1ad4b68fee408f6eade0a3ec353c06a25

Get fetch working using pull-git-repo

Charles Lehner committed on 2/18/2016, 9:14:06 PM
Parent: 46d2baae8f82e8765ce3682a4ff96b62a3fdd1d1

Files changed

index.jschanged
package.jsonchanged
test/remote/git-remote-empty.jschanged
test/remote/git-remote-full.jschanged
test/run.jschanged
index.jsView
@@ -4,8 +4,9 @@
44 var buffered = require('pull-buffered')
55 var pack = require('./lib/pack')
66 var pktLine = require('./lib/pkt-line')
77 var util = require('./lib/util')
8+var multicb = require('multicb')
89
910 function handleOption(options, name, value) {
1011 switch (name) {
1112 case 'verbosity':
@@ -52,9 +53,8 @@
5253 }
5354
5455 // upload-pack: fetch to client
5556 function uploadPack(read, repo, options) {
56- // getObjects, wantSink
5757 /* multi_ack thin-pack side-band side-band-64k ofs-delta shallow no-progress
5858 * include-tag multi_ack_detailed symref=HEAD:refs/heads/master
5959 * agent=git/2.7.0 */
6060 var refSource = repo.refs.bind(repo)
@@ -65,9 +65,10 @@
6565 var readHave = lines.haves()
6666 var acked
6767 var commonHash
6868 var sendPack
69- var earlyDisconnect
69+ var wants = {}
70+ var shallows = {}
7071
7172 // Packfile negotiation
7273 return cat([
7374 pktLine.encode(cat([
@@ -75,26 +76,33 @@
7576 pull.once(''),
7677 function (abort, cb) {
7778 if (abort) return
7879 if (acked) return cb(true)
80+
7981 // read upload request (wants list) from client
80- var readWant = lines.wants(wantsDone)
82+ var readWant = lines.wants()
8183 readWant(null, function (end, want) {
82- if (end === true) {
83- // client disconnected before sending wants
84- earlyDisconnect = true
85- cb(true)
86- } else if (end) {
87- cb(end)
84+ // client may disconnect before sending wants
85+ if (end === true) cb(true)
86+ else if (end) cb(end)
87+ else readWant(null, nextWant)
88+ })
89+ function nextWant(end, want) {
90+ if (end) return wantsDone(end === true ? null : end)
91+ if (want.type == 'want') {
92+ wants[want.hash] = true
93+ } else if (want.type == 'shallow') {
94+ shallows[want.hash] = true
8895 } else {
89- wantSink(readWant)
96+ var err = new Error("Unknown thing", want.type, want.hash)
97+ return readWant(err, function (e) { cb(e || err) })
9098 }
91- })
99+ readWant(null, nextWant)
100+ }
92101
93102 function wantsDone(err) {
94- // console.error('wants done', err, earlyDisconnect)
103+ console.error('wants done', err)
95104 if (err) return cb(err)
96- if (earlyDisconnect) return cb(true)
97105 // Read upload haves (haves list).
98106 // On first obj-id that we have, ACK
99107 // If we have none, NAK.
100108 // TODO: implement multi_ack_detailed
@@ -119,23 +127,126 @@
119127 })
120128 }
121129 },
122130 ])),
131+
123132 function havesDone(abort, cb) {
124- // console.error("haves done", abort && typeof abort, sendPack && typeof sendPack, abort, earlyDisconnect)
125- if (abort || earlyDisconnect) return cb(abort || true)
133+ if (abort) return cb(abort)
126134 // send pack file to client
127135 if (!sendPack)
128- getObjects(commonHash, function (err, numObjects, readObject) {
129- sendPack = pack.encode(numObjects, readObject)
130- havesDone(abort, cb)
131- })
136+ getObjects(repo, commonHash, wants, shallows,
137+ function (err, numObjects, readObjects) {
138+ if (err) return cb(err)
139+ sendPack = pack.encode(numObjects, readObjects)
140+ havesDone(abort, cb)
141+ }
142+ )
132143 else
133144 sendPack(abort, cb)
134145 }
135146 ])
136147 }
137148
149+function getObjects(repo, commonHash, heads, shallows, cb) {
150+ // get objects from commonHash to each head, inclusive.
151+ // if commonHash is falsy, use root
152+ var objects = []
153+ var objectsAdded = {}
154+ var done = multicb({pluck: 1})
155+ var ended
156+
157+ // walk back from heads until get to commonHash
158+ for (var hash in heads)
159+ addObject(hash, done())
160+
161+ // TODO: only add new objects
162+
163+ function addObject(hash, cb) {
164+ if (ended) return cb(ended)
165+ if (hash in objectsAdded || hash == commonHash) return cb()
166+ objectsAdded[hash] = true
167+ repo.getObject(hash, function (err, object) {
168+ if (err) return cb(err)
169+ if (object.type == 'blob') {
170+ objects.push(object)
171+ cb()
172+ } else {
173+ // object must be read twice, so buffer it
174+ bufferObject(object, function (err, object) {
175+ if (err) return cb(err)
176+ objects.push(object)
177+ var hashes = getObjectLinks(object)
178+ for (var sha1 in hashes)
179+ addObject(sha1, done())
180+ cb()
181+ })
182+ }
183+ })
184+ }
185+
186+ done(function (err) {
187+ if (err) return cb(err)
188+ cb(null, objects.length, pull.values(objects))
189+ })
190+}
191+
192+function bufferObject(object, cb) {
193+ pull(
194+ object.read,
195+ pull.collect(function (err, bufs) {
196+ if (err) return cb(err)
197+ var buf = Buffer.concat(bufs, object.length)
198+ cb(null, {
199+ type: object.type,
200+ length: object.length,
201+ data: buf,
202+ read: pull.once(buf)
203+ })
204+ })
205+ )
206+}
207+
208+// get hashes of git objects linked to from other git objects
209+function getObjectLinks(object, cb) {
210+ switch (object.type) {
211+ case 'blob':
212+ return {}
213+ case 'tree':
214+ return getTreeLinks(object.data)
215+ case 'tag':
216+ case 'commit':
217+ return getCommitOrTagLinks(object.data)
218+ }
219+}
220+
221+function getTreeLinks(buf) {
222+ var links = {}
223+ for (var i = 0, j; j = buf.indexOf(0, i, 'ascii') + 1; i = j + 20) {
224+ var hash = buf.slice(j, j + 20).toString('hex')
225+ if (!(hash in links))
226+ links[hash] = true
227+ }
228+ return links
229+}
230+
231+function getCommitOrTagLinks(buf) {
232+ var lines = buf.toString('utf8').split('\n')
233+ var links = {}
234+ // iterate until reach blank line (indicating start of commit/tag body)
235+ for (var i = 0; lines[i]; i++) {
236+ var args = lines[i].split(' ')
237+ switch (args[0]) {
238+ case 'tree':
239+ case 'parent':
240+ case 'object':
241+ var hash = args[1]
242+ if (!(hash in links))
243+ links[hash] = true
244+ }
245+ }
246+ return links
247+}
248+
138249 /*
139250 TODO: investigate capabilities
140251 report-status delete-refs side-band-64k quiet atomic ofs-delta
141252 */
@@ -217,14 +328,8 @@
217328 }
218329
219330 module.exports = function (repo) {
220331 var ended
221- /*
222- var getObjects = opts.getObjects || function (id, cb) {
223- cb(null, 0, pull.empty())
224- }
225- */
226-
227332 var options = {
228333 verbosity: 1,
229334 progress: false
230335 }
package.jsonView
@@ -21,8 +21,9 @@
2121 "bugs": {
2222 "url": "https://github.com/clehner/pull-git-remote-helper/issues"
2323 },
2424 "dependencies": {
25+ "multicb": "^1.2.1",
2526 "pako": "^0.2.8",
2627 "pull-buffered": "^0.3.0",
2728 "pull-cat": "^1.1.8",
2829 "pull-stream": "^3.1.0",
test/remote/git-remote-empty.jsView
@@ -15,9 +15,9 @@
1515 toPull(process.stdin),
1616 require('../../')({
1717 refs: pull.empty(),
1818 hasObject: function (hash, cb) { cb(null, false) },
19- getObject: function (hash, cb) { cb(null, null) },
19+ getObject: function (hash, cb) { cb(new Error('No objects here')) },
2020 update: function (readRefs, readObjects) {
2121 pull(
2222 readRefs,
2323 pull.drain(function (update) {
test/remote/git-remote-full.jsView
@@ -39,9 +39,9 @@
3939 cb(null, hash in hashes)
4040 },
4141 getObject: function (hash, cb) {
4242 var item = hashes[hash]
43- if (!item) return cb(null, null)
43+ if (!item) return cb(new Error('Object not present with hash ' + hash))
4444 cb(null, {
4545 type: item.type,
4646 length: item.object.data.length,
4747 read: pull.once(item.object.data)
test/run.jsView
@@ -126,8 +126,9 @@
126126 })
127127 })
128128 })
129129
130+0 &&
130131 tape('fetch when already up-to-date', function (t) {
131132 t.git('fetch', remote.full, function (msg) {
132133 t.notOk(msg, 'should not get a message here')
133134 }, function (code) {
@@ -135,20 +136,13 @@
135136 t.end()
136137 })
137138 })
138139
139-0 &&
140140 tape('clone into new dir', function (t) {
141141 var dir = path.join(tmpDir, 'clonedir')
142- t.plan(2)
143142 t.git('clone', remote.full, dir, function (msg) {
144- if (msg.want)
145- t.deepEquals(msg.want, {
146- type: 'want',
147- hash: 'edb5b50e8019797925820007d318870f8c346726'
148- }, 'got want')
149- else
150- t.notOk(msg, 'unexpected message')
143+ t.notOk(msg, 'unexpected message')
151144 }, function (code) {
152145 t.equals(code, 0, 'cloned')
146+ t.end()
153147 })
154148 })

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