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Handle hards links even when the copy was interrupted

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This commit is contained in:
Vincent Fourmond 2011-06-04 16:04:41 +02:00
parent 944a953b91
commit 3173d95a4a
1 changed files with 31 additions and 4 deletions
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35
src/dvdcopy.cc
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@ -49,15 +49,42 @@ DVDCopy::DVDCopy()
void DVDCopy::copyFile(const DVDFileData * dat)
{
/// @todo This function shouldn't mix calls to printf and std::cout
/// ? (hmmm, if all calls finish by std::endl, flushes should be
/// fine)
// First, looking for duplicates:
if(dat->dup) {
// We do hard links
/// @todo handle the case when target file already exists.
struct stat st;
std::string source = targetDirectory + dat->dup->fileName();
std::string target = targetDirectory + dat->fileName();
std::cout << "Hardlinking "
<< target << " to " << source << std::endl;
link(source.c_str(), target.c_str());
if(stat(target.c_str(), &st)) {
std::cout << "Hardlinking "
<< target << " to " << source << std::endl;
link(source.c_str(), target.c_str());
}
else {
struct stat stold;
if(stat(source.c_str(), &stold)) {
std::string error = "Must link ";
error += target + " to " + source + ", but the latter doesnt exist !";
throw std::runtime_error(error);
}
// Both target file and source file exists, we check the inode
// numbers are the same.
if(stold.st_ino != st.st_ino) {
std::string error = "Must link ";
error += target + " to " + source + ", but " + target +
" exists and isn't a hard link to " + source + "\n" +
"You must remove it to proceed";
throw std::runtime_error(error);
}
std::cout << "Not hardlinking "
<< target << " to " << source
<< ", already done" << std::endl;
return;
}
return;
}