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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 <QTextStream>
20 #include <QDebug>
21
22 Repository::Repository(const Rules::Repository &rule)
23     : name(rule.name), processHasStarted(false)
24 {
25     foreach (Rules::Repository::Branch branchRule, rule.branches) {
26         Branch branch;
27         branch.created = 0;     // not created
28
29         branches.insert(branchRule.name, branch);
30     }
31
32     // create the default branch
33     branches["master"].created = 1;
34
35     fastImport.setWorkingDirectory(name);
36 }
37
38 Repository::~Repository()
39 {
40     if (fastImport.state() != QProcess::NotRunning) {
41         fastImport.closeWriteChannel();
42         fastImport.waitForFinished();
43     }
44 }
45
46 void Repository::reloadBranches()
47 {
48     QHash<QString, Branch>::Iterator it = branches.begin(),
49                                     end = branches.end();
50     for ( ; it != end; ++it) {
51         QString branchRef = it.key();
52         if (!branchRef.startsWith("refs/"))
53             branchRef.prepend("refs/heads/");
54
55         bool branchExists;
56         // does this branch already exist?
57         QProcess revParse;
58         revParse.setWorkingDirectory(name);
59         revParse.start("git-rev-parse", QStringList() << "--verify" << branchRef);
60         revParse.waitForFinished();
61
62         if (revParse.exitCode() == 0)
63             branchExists = true;
64         else
65             branchExists = false;
66
67         if (branchExists) {
68             startFastImport();
69             fastImport.write("reset " + branchRef.toUtf8() +
70                              "\nfrom " + branchRef.toUtf8() + "^0\n\n");
71             it->created = 1;
72         }
73     }
74 }
75
76 void Repository::createBranch(const QString &branch, int revnum,
77                               const QString &branchFrom, int)
78 {
79     if (!branches.contains(branch)) {
80         qWarning() << branch << "is not a known branch in repository" << name << endl
81                    << "Going to create it automatically";
82     }
83
84     startFastImport();
85     QByteArray branchRef = branch.toUtf8();
86     if (!branchRef.startsWith("refs/"))
87         branchRef.prepend("refs/heads/");
88
89     Branch &br = branches[branch];
90     if (br.created && br.created != revnum) {
91         QByteArray backupBranch = branchRef + '_' + QByteArray::number(revnum);
92         qWarning() << branch << "already exists; backing up to" << backupBranch;
93
94         fastImport.write("reset " + backupBranch + "\nfrom " + branchRef + "\n\n");
95     }
96
97     // now create the branch
98     br.created = revnum;
99     QByteArray branchFromRef = branchFrom.toUtf8();
100     if (!branchFromRef.startsWith("refs/"))
101         branchFromRef.prepend("refs/heads/");
102
103     if (!branches.contains(branchFrom) || !branches.value(branchFrom).created) {
104         qCritical() << branch << "in repository" << name
105                     << "is branching from branch" << branchFrom
106                     << "but the latter doesn't exist. Can't continue.";
107         exit(1);
108     }
109
110     fastImport.write("reset " + branchRef + "\nfrom " + branchFromRef + "\n\n");
111 }
112
113 Repository::Transaction *Repository::newTransaction(const QString &branch, const QString &svnprefix,
114                                                     int revnum)
115 {
116     if (!branches.contains(branch)) {
117         qCritical() << branch << "is not a known branch in repository" << name;
118         return 0;
119     }
120
121     Transaction *txn = new Transaction;
122     txn->repository = this;
123     txn->branch = branch.toUtf8();
124     txn->svnprefix = svnprefix.toUtf8();
125     txn->datetime = 0;
126     txn->revnum = revnum;
127     txn->lastmark = revnum;
128
129     startFastImport();
130     if ((++commitCount % 10000) == 0)
131         // write everything to disk every 10000 commits
132         fastImport.write("checkpoint\n");
133     return txn;
134 }
135
136 void Repository::startFastImport()
137 {
138     if (fastImport.state() == QProcess::NotRunning) {
139         if (processHasStarted)
140             qFatal("git-fast-import has been started once and crashed?");
141         processHasStarted = true;
142
143         // start the process
144         QString outputFile = name;
145         outputFile.replace('/', '_');
146         outputFile.prepend("log-");
147         fastImport.setStandardOutputFile(outputFile, QIODevice::Append);
148         fastImport.setProcessChannelMode(QProcess::MergedChannels);
149
150 #ifndef DRY_RUN
151         fastImport.start("git-fast-import", QStringList());
152 #else
153         fastImport.start("/bin/cat", QStringList());
154 #endif
155     }
156 }
157
158 Repository::Transaction::~Transaction()
159 {
160 }
161
162 void Repository::Transaction::setAuthor(const QByteArray &a)
163 {
164     author = a;
165 }
166
167 void Repository::Transaction::setDateTime(uint dt)
168 {
169     datetime = dt;
170 }
171
172 void Repository::Transaction::setLog(const QByteArray &l)
173 {
174     log = l;
175 }
176
177 void Repository::Transaction::deleteFile(const QString &path)
178 {
179     deletedFiles.append(path);
180 }
181
182 QIODevice *Repository::Transaction::addFile(const QString &path, int mode, qint64 length)
183 {
184     FileProperties fp;
185     fp.mode = mode;
186     fp.mark = ++lastmark;
187
188 #ifndef DRY_RUN
189     repository->fastImport.write("blob\nmark :");
190     repository->fastImport.write(QByteArray::number(fp.mark));
191     repository->fastImport.write("\ndata ");
192     repository->fastImport.write(QByteArray::number(length));
193     repository->fastImport.write("\n", 1);
194 #endif
195
196     modifiedFiles.insert(path, fp);
197     return &repository->fastImport;
198 }
199
200 void Repository::Transaction::commit()
201 {
202     // create the commit message
203     QByteArray message = log;
204     if (!message.endsWith('\n'))
205         message += '\n';
206     message += "\nsvn path=" + svnprefix + "; revision=" + QByteArray::number(revnum) + "\n";
207
208     {
209         QByteArray branchRef = branch;
210         if (!branchRef.startsWith("refs/"))
211             branchRef.prepend("refs/heads/");
212
213         QTextStream s(&repository->fastImport);
214         s << "commit " << branchRef << endl;
215         s << "mark :" << revnum << endl;
216         s << "committer " << QString::fromUtf8(author) << ' ' << datetime << " -0000" << endl;
217
218         Branch &br = repository->branches[branch];
219         if (!br.created) {
220             qWarning() << "Branch" << branch << "doesn't exist at revision"
221                        << revnum << "-- did you resume from the wrong revision?";
222             br.created = revnum;
223         }
224
225         s << "data " << message.length() << endl;
226     }
227
228     repository->fastImport.write(message);
229     repository->fastImport.putChar('\n');
230
231     // write the file deletions
232     if (deletedFiles.contains(""))
233         repository->fastImport.write("deleteall\n");
234     else
235         foreach (QString df, deletedFiles)
236             repository->fastImport.write("D " + df.toUtf8() + "\n");
237
238     // write the file modifications
239     QHash<QString, FileProperties>::ConstIterator it = modifiedFiles.constBegin();
240     for ( ; it != modifiedFiles.constEnd(); ++it) {
241         repository->fastImport.write("M ", 2);
242         repository->fastImport.write(QByteArray::number(it->mode, 8));
243         repository->fastImport.write(" :", 2);
244         repository->fastImport.write(QByteArray::number(it->mark));
245         repository->fastImport.write(" ", 1);
246         repository->fastImport.write(it.key().toUtf8());
247         repository->fastImport.write("\n", 1);
248     }
249
250     repository->fastImport.write("\n");
251
252     while (repository->fastImport.bytesToWrite())
253         if (!repository->fastImport.waitForBytesWritten(-1))
254             qFatal("Failed to write to process: %s", qPrintable(repository->fastImport.errorString()));
255 }
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