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1 | /* | |
2 | * Copyright (C) 2007 Thiago Macieira <thiago@kde.org> | |
3 | * | |
4 | * This program is free software: you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation, either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include "repository.h" | |
19 | #include "options.h" | |
20 | #include <QTextStream> | |
21 | #include <QDebug> | |
22 | #include <QLinkedList> | |
23 | ||
24 | static const int maxSimultaneousProcesses = 100; | |
25 | ||
26 | class ProcessCache: QLinkedList<Repository *> | |
27 | { | |
28 | public: | |
29 | void touch(Repository *repo) | |
30 | { | |
31 | remove(repo); | |
32 | ||
33 | // if the cache is too big, remove from the front | |
34 | while (size() >= maxSimultaneousProcesses) | |
35 | takeFirst()->closeFastImport(); | |
36 | ||
37 | // append to the end | |
38 | append(repo); | |
39 | } | |
40 | ||
41 | inline void remove(Repository *repo) | |
42 | { | |
43 | removeOne(repo); | |
44 | } | |
45 | }; | |
46 | static ProcessCache processCache; | |
47 | ||
48 | Repository::Repository(const Rules::Repository &rule) | |
49 | : name(rule.name), commitCount(0), outstandingTransactions(0), processHasStarted(false) | |
50 | { | |
51 | foreach (Rules::Repository::Branch branchRule, rule.branches) { | |
52 | Branch branch; | |
53 | branch.created = 0; // not created | |
54 | ||
55 | branches.insert(branchRule.name, branch); | |
56 | } | |
57 | ||
58 | // create the default branch | |
59 | branches["master"].created = 1; | |
60 | ||
61 | fastImport.setWorkingDirectory(name); | |
62 | } | |
63 | ||
64 | Repository::~Repository() | |
65 | { | |
66 | Q_ASSERT(outstandingTransactions == 0); | |
67 | closeFastImport(); | |
68 | } | |
69 | ||
70 | void Repository::closeFastImport() | |
71 | { | |
72 | if (fastImport.state() != QProcess::NotRunning) { | |
73 | fastImport.write("checkpoint\n"); | |
74 | fastImport.waitForBytesWritten(-1); | |
75 | fastImport.closeWriteChannel(); | |
76 | if (!fastImport.waitForFinished()) { | |
77 | fastImport.terminate(); | |
78 | if (!fastImport.waitForFinished(200)) | |
79 | qWarning() << "git-fast-import for repository" << name << "did not die"; | |
80 | } | |
81 | } | |
82 | processHasStarted = false; | |
83 | processCache.remove(this); | |
84 | } | |
85 | ||
86 | void Repository::reloadBranches() | |
87 | { | |
88 | QProcess revParse; | |
89 | revParse.setWorkingDirectory(name); | |
90 | revParse.start("git", QStringList() << "rev-parse" << "--symbolic" << "--branches"); | |
91 | revParse.waitForFinished(-1); | |
92 | ||
93 | if (revParse.exitCode() == 0 && revParse.bytesAvailable()) { | |
94 | while (revParse.canReadLine()) { | |
95 | QByteArray branchName = revParse.readLine().trimmed(); | |
96 | ||
97 | //qDebug() << "Repo" << name << "reloaded branch" << branchName; | |
98 | branches[branchName].created = 1; | |
99 | fastImport.write("reset refs/heads/" + branchName + | |
100 | "\nfrom refs/heads/" + branchName + "^0\n\n" | |
101 | "progress Branch refs/heads/" + branchName + " reloaded\n"); | |
102 | } | |
103 | } | |
104 | } | |
105 | ||
106 | void Repository::createBranch(const QString &branch, int revnum, | |
107 | const QString &branchFrom, int) | |
108 | { | |
109 | startFastImport(); | |
110 | if (!branches.contains(branch)) { | |
111 | qWarning() << branch << "is not a known branch in repository" << name << endl | |
112 | << "Going to create it automatically"; | |
113 | } | |
114 | ||
115 | QByteArray branchRef = branch.toUtf8(); | |
116 | if (!branchRef.startsWith("refs/")) | |
117 | branchRef.prepend("refs/heads/"); | |
118 | ||
119 | Branch &br = branches[branch]; | |
120 | if (br.created && br.created != revnum) { | |
121 | QByteArray backupBranch = branchRef + '_' + QByteArray::number(revnum); | |
122 | qWarning() << branch << "already exists; backing up to" << backupBranch; | |
123 | ||
124 | fastImport.write("reset " + backupBranch + "\nfrom " + branchRef + "\n\n"); | |
125 | } | |
126 | ||
127 | // now create the branch | |
128 | br.created = revnum; | |
129 | QByteArray branchFromRef = branchFrom.toUtf8(); | |
130 | if (!branchFromRef.startsWith("refs/")) | |
131 | branchFromRef.prepend("refs/heads/"); | |
132 | ||
133 | if (!branches.contains(branchFrom) || !branches.value(branchFrom).created) { | |
134 | qCritical() << branch << "in repository" << name | |
135 | << "is branching from branch" << branchFrom | |
136 | << "but the latter doesn't exist. Can't continue."; | |
137 | exit(1); | |
138 | } | |
139 | ||
140 | fastImport.write("reset " + branchRef + "\nfrom " + branchFromRef + "\n\n" | |
141 | "progress Branch " + branchRef + " created from " + branchFromRef + "\n\n"); | |
142 | } | |
143 | ||
144 | Repository::Transaction *Repository::newTransaction(const QString &branch, const QString &svnprefix, | |
145 | int revnum) | |
146 | { | |
147 | startFastImport(); | |
148 | if (!branches.contains(branch)) { | |
149 | qWarning() << branch << "is not a known branch in repository" << name << endl | |
150 | << "Going to create it automatically"; | |
151 | } | |
152 | ||
153 | Transaction *txn = new Transaction; | |
154 | txn->repository = this; | |
155 | txn->branch = branch.toUtf8(); | |
156 | txn->svnprefix = svnprefix.toUtf8(); | |
157 | txn->datetime = 0; | |
158 | txn->revnum = revnum; | |
159 | ||
160 | if ((++commitCount % 10000) == 0) | |
161 | // write everything to disk every 10000 commits | |
162 | fastImport.write("checkpoint\n"); | |
163 | if (outstandingTransactions++ == 0) | |
164 | lastmark = 1; // reset the mark number | |
165 | return txn; | |
166 | } | |
167 | ||
168 | void Repository::startFastImport() | |
169 | { | |
170 | if (fastImport.state() == QProcess::NotRunning) { | |
171 | if (processHasStarted) | |
172 | qFatal("git-fast-import has been started once and crashed?"); | |
173 | processHasStarted = true; | |
174 | ||
175 | // start the process | |
176 | QString outputFile = name; | |
177 | outputFile.replace('/', '_'); | |
178 | outputFile.prepend("log-"); | |
179 | fastImport.setStandardOutputFile(outputFile, QIODevice::Append); | |
180 | fastImport.setProcessChannelMode(QProcess::MergedChannels); | |
181 | ||
182 | #ifndef DRY_RUN | |
183 | fastImport.start("git", QStringList() << "fast-import"); | |
184 | #else | |
185 | fastImport.start("/bin/cat", QStringList()); | |
186 | #endif | |
187 | ||
188 | reloadBranches(); | |
189 | } | |
190 | } | |
191 | ||
192 | Repository::Transaction::~Transaction() | |
193 | { | |
194 | --repository->outstandingTransactions; | |
195 | } | |
196 | ||
197 | void Repository::Transaction::setAuthor(const QByteArray &a) | |
198 | { | |
199 | author = a; | |
200 | } | |
201 | ||
202 | void Repository::Transaction::setDateTime(uint dt) | |
203 | { | |
204 | datetime = dt; | |
205 | } | |
206 | ||
207 | void Repository::Transaction::setLog(const QByteArray &l) | |
208 | { | |
209 | log = l; | |
210 | } | |
211 | ||
212 | void Repository::Transaction::deleteFile(const QString &path) | |
213 | { | |
214 | deletedFiles.append(path); | |
215 | } | |
216 | ||
217 | QIODevice *Repository::Transaction::addFile(const QString &path, int mode, qint64 length) | |
218 | { | |
219 | int mark = ++repository->lastmark; | |
220 | ||
221 | if (modifiedFiles.capacity() == 0) | |
222 | modifiedFiles.reserve(2048); | |
223 | modifiedFiles.append("M "); | |
224 | modifiedFiles.append(QByteArray::number(mode, 8)); | |
225 | modifiedFiles.append(" :"); | |
226 | modifiedFiles.append(QByteArray::number(mark)); | |
227 | modifiedFiles.append(' '); | |
228 | modifiedFiles.append(path.toUtf8()); | |
229 | modifiedFiles.append("\n"); | |
230 | ||
231 | #ifndef DRY_RUN | |
232 | repository->fastImport.write("blob\nmark :"); | |
233 | repository->fastImport.write(QByteArray::number(mark)); | |
234 | repository->fastImport.write("\ndata "); | |
235 | repository->fastImport.write(QByteArray::number(length)); | |
236 | repository->fastImport.write("\n", 1); | |
237 | #endif | |
238 | ||
239 | return &repository->fastImport; | |
240 | } | |
241 | ||
242 | void Repository::Transaction::commit() | |
243 | { | |
244 | processCache.touch(repository); | |
245 | ||
246 | // create the commit message | |
247 | QByteArray message = log; | |
248 | if (!message.endsWith('\n')) | |
249 | message += '\n'; | |
250 | if (Options::globalOptions->switches.value("metadata", true)) | |
251 | message += "\nsvn path=" + svnprefix + "; revision=" + QByteArray::number(revnum) + "\n"; | |
252 | ||
253 | { | |
254 | QByteArray branchRef = branch; | |
255 | if (!branchRef.startsWith("refs/")) | |
256 | branchRef.prepend("refs/heads/"); | |
257 | ||
258 | QTextStream s(&repository->fastImport); | |
259 | s << "commit " << branchRef << endl; | |
260 | s << "committer " << QString::fromUtf8(author) << ' ' << datetime << " -0000" << endl; | |
261 | ||
262 | Branch &br = repository->branches[branch]; | |
263 | if (!br.created) { | |
264 | qWarning() << "Branch" << branch << "in repository" << repository->name << "doesn't exist at revision" | |
265 | << revnum << "-- did you resume from the wrong revision?"; | |
266 | br.created = revnum; | |
267 | } | |
268 | ||
269 | s << "data " << message.length() << endl; | |
270 | } | |
271 | ||
272 | repository->fastImport.write(message); | |
273 | repository->fastImport.putChar('\n'); | |
274 | ||
275 | // write the file deletions | |
276 | if (deletedFiles.contains("")) | |
277 | repository->fastImport.write("deleteall\n"); | |
278 | else | |
279 | foreach (QString df, deletedFiles) | |
280 | repository->fastImport.write("D " + df.toUtf8() + "\n"); | |
281 | ||
282 | // write the file modifications | |
283 | repository->fastImport.write(modifiedFiles); | |
284 | ||
285 | repository->fastImport.write("\nprogress Commit #" + | |
286 | QByteArray::number(repository->commitCount) + | |
287 | " branch " + branch + | |
288 | " = SVN r" + QByteArray::number(revnum) + "\n\n"); | |
289 | printf(" %d modifications to \"%s\"", | |
290 | deletedFiles.count() + modifiedFiles.count(), | |
291 | qPrintable(repository->name)); | |
292 | ||
293 | while (repository->fastImport.bytesToWrite()) | |
294 | if (!repository->fastImport.waitForBytesWritten(-1)) | |
295 | qFatal("Failed to write to process: %s", qPrintable(repository->fastImport.errorString())); | |
296 | } |