src/repository.cpp

   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 << "in repository" << repository->name << "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 }