Use `memfd_create` for temporary files where possible about chezmoi HOT 1 CLOSED

I did some further investigation, and I don't think memfd_create is worth using because:

1. For commands that invoke an external process, like chezmoi diff, chezmoi edit, and chezmoi merge, the filename on disk is important (c.f. #1481), so using an in-memory file descriptor is not sufficient as it has no meaningful filename.
2. Where possible, chezmoi already uses pipes to communicate with subprocesses. These already have the advantage of anonymity and being automatically cleaned up when chezmoi exits.
3. memfd_create is not available on all OSes (e.g. macOS and Windows), so the existing temporary file code needs to be maintained for these OSes anyway.

Overall, there might be a couple of cases where chezmoi is using temporary files where memfd_create would make more sense. If you would like to contribute such an improvement then searching the source code for TempDir and os.MkdirTemp is a good start for finding where temporary files and directories are currently used. For now, I'll close this issue.

from chezmoi.