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tweaks: rename two variables, to avoid a repetitive prefix 

Also, fold a condition into an assignment, for conciseness.
master
Benno Schulenberg 2020-07-17 16:22:03 +02:00
parent a322dab482
commit 292e505e01
1 changed files with 9 additions and 12 deletions
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21
src/files.c
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@ -1580,7 +1580,7 @@ int sync_file(FILE *thefile)
bool make_backup_of(char *realname)
{
FILE *original = NULL, *backup_file = NULL;
int backup_cflags, backup_fd, verdict;
int creation_flags, descriptor, verdict;
static struct timespec filetime[2];
bool second_attempt = FALSE;
char *backupname = NULL;
@ -1631,30 +1631,27 @@ bool make_backup_of(char *realname)
if (unlink(backupname) < 0 && errno != ENOENT && !ISSET(INSECURE_BACKUP))
goto backup_error;
if (ISSET(INSECURE_BACKUP))
backup_cflags = O_WRONLY | O_CREAT | O_TRUNC;
else
backup_cflags = O_WRONLY | O_CREAT | O_EXCL;
creation_flags = O_WRONLY|O_CREAT|(ISSET(INSECURE_BACKUP) ? O_TRUNC : O_EXCL);
/* Create the backup file (or truncate the existing one). */
backup_fd = open(backupname, backup_cflags, S_IRUSR|S_IWUSR);
descriptor = open(backupname, creation_flags, S_IRUSR|S_IWUSR);
retry_backup:
if (backup_fd >= 0)
backup_file = fdopen(backup_fd, "wb");
if (descriptor >= 0)
backup_file = fdopen(descriptor, "wb");
if (backup_file == NULL)
goto backup_error;
/* Try to change owner and group to those of the original file;
* ignore errors, as a normal user cannot change the owner. */
IGNORE_CALL_RESULT(fchown(backup_fd, openfile->statinfo->st_uid,
IGNORE_CALL_RESULT(fchown(descriptor, openfile->statinfo->st_uid,
openfile->statinfo->st_gid));
/* Set the backup's permissions to those of the original file.
* It is not a security issue if this fails, as we have created
* the file with just read and write permission for the owner. */
IGNORE_CALL_RESULT(fchmod(backup_fd, openfile->statinfo->st_mode));
IGNORE_CALL_RESULT(fchmod(descriptor, openfile->statinfo->st_mode));
original = fopen(realname, "rb");
@ -1687,7 +1684,7 @@ bool make_backup_of(char *realname)
/* Set the backup's timestamps to those of the original file.
* Failure is unimportant: saving the file apparently worked. */
IGNORE_CALL_RESULT(futimens(backup_fd, filetime));
IGNORE_CALL_RESULT(futimens(descriptor, filetime));
if (fclose(backup_file) == 0) {
free(backupname);
@ -1709,7 +1706,7 @@ bool make_backup_of(char *realname)
backupname = charalloc(strlen(homedir) + strlen(tail(realname)) + 9);
sprintf(backupname, "%s/%s~XXXXXX", homedir, tail(realname));
backup_fd = mkstemp(backupname);
descriptor = mkstemp(backupname);
backup_file = NULL;
second_attempt = TRUE;