This is groundwork for setting the close-on-exec flag when opening
files, which will be done in Utility.FileIO or a similar module using the same
function names. The bytestring library does not set that flag, even though it
could, and IMHO should.
Note that there are many calls to the Prelude's readFile/writeFile/appendFile
still in git-annex, and this does not address those.
Sponsored-by: the NIH-funded NICEMAN (ReproNim TR&D3) project
When an UNC-style path is passed into openTempFile, the returned file
starts with that same style of path. Which can cause problems, eg piping
that filename to git failed. So, convert the output filename to be
relative to the input temp directory.
And follow-on changes.
Note that relatedTemplate was changed to operate on a RawFilePath, and
so when it counts the length, it is now the number of bytes, not the
number of code points. This will just make it truncate shorter strings
in some cases, the truncation is still unicode aware.
When not building with the OsPath flag, toOsPath . fromRawFilePath and
fromRawFilePath . fromOsPath do extra conversions back and forth between
String and ByteString. That overhead could be avoided, but that's the
non-optimised build mode, so didn't bother.
Sponsored-by: unqueued
