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Add more inseure backup checks to that strange cases like with ACLs will work with allow_insecure_backup. 

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4509 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
This commit is contained in:
Chris Allegretta 2010-06-24 14:47:00 +00:00
parent 0acca27ac7
commit 461519cce7
1 changed files with 17 additions and 9 deletions
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26
src/files.c
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@ -1458,6 +1458,7 @@ bool write_file(const char *name, FILE *f_open, bool tmp, append_type
/* The actual file, realname, we are writing to. */
char *tempname = NULL;
/* The temp file name we write to on prepend. */
int backup_cflags;
assert(name != NULL);
@ -1592,14 +1593,19 @@ bool write_file(const char *name, FILE *f_open, bool tmp, append_type
/* First, unlink any existing backups. Next, open the backup
file with O_CREAT and O_EXCL. If it succeeds, we
have a file descriptor to a new backup file. */
if (unlink(backupname) < 0 && errno != ENOENT) {
if (unlink(backupname) < 0 && errno != ENOENT && !ISSET(INSECURE_BACKUP)) {
statusbar(_("Error writing backup file %s: %s"), backupname,
strerror(errno));
free(backupname);
goto cleanup_and_exit;
}
backup_fd = open(backupname, O_WRONLY | O_CREAT | O_EXCL | O_APPEND,
if (ISSET(INSECURE_BACKUP))
backup_cflags = O_WRONLY | O_CREAT | O_APPEND;
else
backup_cflags = O_WRONLY | O_CREAT | O_EXCL | O_APPEND;
backup_fd = open(backupname, backup_cflags,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
/* Now we've got a safe file stream. If the previous open()
call failed, this will return NULL. */
@ -1643,14 +1649,16 @@ bool write_file(const char *name, FILE *f_open, bool tmp, append_type
/* Copy the file. */
copy_status = copy_file(f, backup_file);
/* And set its metadata. */
if (copy_status != 0 || utime(backupname, &filetime) == -1) {
if (copy_status == -1) {
statusbar(_("Error reading %s: %s"), realname,
if (copy_status != 0) {
statusbar(_("Error reading %s: %s"), realname,
strerror(errno));
beep();
} else
statusbar(_("Error writing backup file %s: %s"), backupname,
beep();
goto cleanup_and_exit;
}
/* And set its metadata. */
if (utime(backupname, &filetime) == -1 && !ISSET(INSECURE_BACKUP)) {
statusbar(_("Error writing backup file %s: %s"), backupname,
strerror(errno));
/* If we can't write to the backup, DONT go on, since
whatever caused the backup file to fail (e.g. disk