[PATCH 0/2] Do not lock temporary files via child processes on Windows

This issue was originally reported and fixed in https://github.com/git-for-windows/git/pull/755

The problem is that file handles to temporary files (such as index.lock) were inherited by spawned processes. If those spawned processes do not exit before the parent process wants to delete or rename them, we are in big trouble.

The original use case triggering the bug is a merge driver that does not quit, but listen to subsequent merge requests.

However, the same issue turned up in Lars Schneider's work on making clean/smudge filters batchable (i.e. more efficient by avoiding possibly thousands of child processes, one per file).

Ben Wijen (2):
  t6026-merge-attr: child processes must not inherit index.lock handles
  mingw: ensure temporary file handles are not inherited by child
    processes

 compat/mingw.h        |  4 ++++
 t/t6026-merge-attr.sh | 13 +++++++++++++
 tempfile.c            |  2 +-
 3 files changed, 18 insertions(+), 1 deletion(-)

Published-As: https://github.com/dscho/git/releases/tag/mingw-index-lock-v1
Fetch-It-Via: git fetch https://github.com/dscho/git mingw-index-lock-v1