blob: 68b1d24e457624d5b8206f3b90a6804f417c8edc [file] [log] [blame]
#include "util/temporary_file.hpp"
#include <errno.h> // for errno
#include <stdlib.h> // for mkstemp()
#include <string.h> // for strerror()
#include <unistd.h> // for close()
#include <stdexcept>
#include <string>
namespace util
{
TemporaryFile::TemporaryFile()
{
// Build template path required by mkstemp()
std::string templatePath = fs::temp_directory_path() /
"openpower-hw-diags-XXXXXX";
// Generate unique file name, create file, and open it. The XXXXXX
// characters are replaced by mkstemp() to make the file name unique.
int fd = mkstemp(templatePath.data());
if (fd == -1)
{
throw std::runtime_error{
std::string{"Unable to create temporary file: "} + strerror(errno)};
}
// Store path to temporary file
path = templatePath;
// Close file descriptor
if (close(fd) == -1)
{
// Save errno value; will likely change when we delete temporary file
int savedErrno = errno;
// Delete temporary file. The destructor won't be called because the
// exception below causes this constructor to exit without completing.
remove();
throw std::runtime_error{
std::string{"Unable to close temporary file: "} +
strerror(savedErrno)};
}
}
TemporaryFile& TemporaryFile::operator=(TemporaryFile&& file)
{
// Verify not assigning object to itself (a = std::move(a))
if (this != &file)
{
// Delete temporary file owned by this object
remove();
// Move temporary file path from other object, transferring ownership
path = std::move(file.path);
// Clear path in other object; after move path is in unspecified state
file.path.clear();
}
return *this;
}
void TemporaryFile::remove()
{
if (!path.empty())
{
// Delete temporary file from file system
fs::remove(path);
// Clear path to indicate file has been deleted
path.clear();
}
}
} // namespace util