debug log in copy_file_linux
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1 changed files with 19 additions and 0 deletions
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@ -443,6 +443,8 @@ bool copy_file_linux(const boost::filesystem::path &from, const boost::filesyste
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ec.clear();
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int err = 0;
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BOOST_LOG_TRIVIAL(trace) << "copy_file_linux("<<from<<", "<<to<< ")";
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// Note: Declare fd_wrappers here so that errno is not clobbered by close() that may be called in fd_wrapper destructors
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fd_wrapper infile, outfile;
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@ -458,6 +460,8 @@ bool copy_file_linux(const boost::filesystem::path &from, const boost::filesyste
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}
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break;
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}
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BOOST_LOG_TRIVIAL(trace) << "infile.fd";
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struct ::stat from_stat;
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if (::fstat(infile.fd, &from_stat) != 0) {
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@ -465,6 +469,8 @@ bool copy_file_linux(const boost::filesystem::path &from, const boost::filesyste
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err = errno;
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goto fail;
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}
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BOOST_LOG_TRIVIAL(trace) << "from_stat";
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const mode_t from_mode = from_stat.st_mode;
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if (!S_ISREG(from_mode)) {
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@ -472,6 +478,8 @@ bool copy_file_linux(const boost::filesystem::path &from, const boost::filesyste
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goto fail;
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}
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BOOST_LOG_TRIVIAL(trace) << "from_mode";
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// Enable writing for the newly created files. Having write permission set is important e.g. for NFS,
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// which checks the file permission on the server, even if the client's file descriptor supports writing.
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mode_t to_mode = from_mode | S_IWUSR;
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@ -487,22 +495,29 @@ bool copy_file_linux(const boost::filesystem::path &from, const boost::filesyste
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}
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break;
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}
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BOOST_LOG_TRIVIAL(trace) << "outfile.fd";
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struct ::stat to_stat;
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if (::fstat(outfile.fd, &to_stat) != 0)
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goto fail_errno;
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BOOST_LOG_TRIVIAL(trace) << "to_stat";
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to_mode = to_stat.st_mode;
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if (!S_ISREG(to_mode)) {
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err = ENOSYS;
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goto fail;
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}
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BOOST_LOG_TRIVIAL(trace) << "to_mode";
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if (from_stat.st_dev == to_stat.st_dev && from_stat.st_ino == to_stat.st_ino) {
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err = EEXIST;
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goto fail;
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}
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BOOST_LOG_TRIVIAL(trace) << "from / to compare";
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//! copy_file implementation that uses sendfile loop. Requires sendfile to support file descriptors.
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//FIXME Vojtech: This is a copy loop valid for Linux 2.6.33 and newer.
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// copy_file_data_copy_file_range() supports cross-filesystem copying since 5.3, but Vojtech did not want to polute this
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@ -530,6 +545,8 @@ bool copy_file_linux(const boost::filesystem::path &from, const boost::filesyste
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}
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}
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BOOST_LOG_TRIVIAL(trace) << "sendfile loop";
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// If we created a new file with an explicitly added S_IWUSR permission,
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// we may need to update its mode bits to match the source file.
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if (to_mode != from_mode && ::fchmod(outfile.fd, from_mode) != 0) {
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@ -553,6 +570,8 @@ bool copy_file_linux(const boost::filesystem::path &from, const boost::filesyste
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if (err != 0)
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goto fail_errno;
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BOOST_LOG_TRIVIAL(trace) << "copy_file_linux success";
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return true;
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}
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#endif // __linux__
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