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