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Zane Shelley6e365872020-10-23 22:00:05 -05001#include "util/temporary_file.hpp"
2
3#include <errno.h> // for errno
4#include <stdlib.h> // for mkstemp()
5#include <string.h> // for strerror()
6#include <unistd.h> // for close()
7
8#include <stdexcept>
9#include <string>
10
11namespace util
12{
13
14TemporaryFile::TemporaryFile()
15{
16 // Build template path required by mkstemp()
17 std::string templatePath =
18 fs::temp_directory_path() / "openpower-hw-diags-XXXXXX";
19
20 // Generate unique file name, create file, and open it. The XXXXXX
21 // characters are replaced by mkstemp() to make the file name unique.
22 int fd = mkstemp(templatePath.data());
23 if (fd == -1)
24 {
25 throw std::runtime_error{
26 std::string{"Unable to create temporary file: "} + strerror(errno)};
27 }
28
29 // Store path to temporary file
30 path = templatePath;
31
32 // Close file descriptor
33 if (close(fd) == -1)
34 {
35 // Save errno value; will likely change when we delete temporary file
36 int savedErrno = errno;
37
38 // Delete temporary file. The destructor won't be called because the
39 // exception below causes this constructor to exit without completing.
40 remove();
41
42 throw std::runtime_error{
43 std::string{"Unable to close temporary file: "} +
44 strerror(savedErrno)};
45 }
46}
47
48TemporaryFile& TemporaryFile::operator=(TemporaryFile&& file)
49{
50 // Verify not assigning object to itself (a = std::move(a))
51 if (this != &file)
52 {
53 // Delete temporary file owned by this object
54 remove();
55
56 // Move temporary file path from other object, transferring ownership
57 path = std::move(file.path);
58
59 // Clear path in other object; after move path is in unspecified state
60 file.path.clear();
61 }
62 return *this;
63}
64
65void TemporaryFile::remove()
66{
67 if (!path.empty())
68 {
69 // Delete temporary file from file system
70 fs::remove(path);
71
72 // Clear path to indicate file has been deleted
73 path.clear();
74 }
75}
76
77} // namespace util