PEL: Create TemporaryFile class
Added support for creating temporary file
- Constructor creates the temporary file with data
- Destructor doesn't deletes file due to PEL function
related requirements.
- Provided remove function to delete the file.
Tested: Added test cases for TemporaryFile class and verified
test_openpower_pels_temporary_file OK 0.03s
Signed-off-by: Jayanth Othayoth <ojayanth@in.ibm.com>
Change-Id: I5295998d746ef1228512545f0a19faa1f94260d8
diff --git a/extensions/openpower-pels/temporary_file.cpp b/extensions/openpower-pels/temporary_file.cpp
new file mode 100644
index 0000000..5c52ccc
--- /dev/null
+++ b/extensions/openpower-pels/temporary_file.cpp
@@ -0,0 +1,79 @@
+#include "temporary_file.hpp"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <stdexcept>
+
+namespace openpower
+{
+namespace pels
+{
+namespace util
+{
+
+TemporaryFile::TemporaryFile(const char* data, const uint32_t len)
+{
+ // Build template path required by mkstemp()
+ std::string templatePath =
+ fs::temp_directory_path() / "phosphor-logging-XXXXXX";
+
+ // Generate unique file name, create file, and open it. The XXXXXX
+ // characters are replaced by mkstemp() to make the file name unique.
+ fd = mkostemp(templatePath.data(), O_RDWR);
+ if (fd == -1)
+ {
+ throw std::runtime_error{
+ std::string{"Unable to create temporary file: "} + strerror(errno)};
+ }
+
+ // Update file with input Buffer data
+ auto rc = write(fd, data, len);
+ if (rc == -1)
+ {
+ // 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 update file: "} +
+ strerror(errno)};
+ }
+
+ // Store path to temporary file
+ path = templatePath;
+}
+
+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
+} // namespace pels
+} // namespace openpower