If a system crash occurs after a simple write file + rename operation
the target file that was renamed over may end up being empty if the data
for the file written had not yet been committed to disk. This is
possible because no part of the open file, write data to it, close it
and then rename it ensure the data was actually written to disk prior to
the rename happening. See this discussion on the btrfs wiki[1].
Fix this possible data loss scenario by calling fsync on the temporary
file that is written prior to calling close on it.
[1] https://btrfs.wiki.kernel.org/index.php/FAQ#What_are_the_crash_guarantees_of_overwrite-by-rename.3F
A file name con.zip is also treated in the same way as the special CON
redirection and may not be used as a normal filesystem path in Windows.
This includes any extension, even with multiple dots. Fix checkFilename
and cleaneFilename not handling these cases.
Write new file contents to a temporary file and then rename over the
target file to avoid data loss in the unlikely event there's an error
writing the new file contents or the process is interrupted.
Resolves#416.
Use lib* prefix for the modules impored from the lib package to help
distinguish them more from ordinary variables. Fix up the naming
convention for files to be consistently lowercase_underscore for
JavaScript files.
Hornwitser