[PATCH 0/1] t6042: fix breakage on Windows

Unfortunately, Travis decided to change some things under the hood that affect the Windows build. As a consequence, master has not been tested in quite a while, even if the test runs pretended that it had been tested :-(

So imagine my surprise when master simply would refuse to pass the test suite cleanly outside Travis, always failing at t6042, despite the fact that Travis passed.

It turns out that two files are written too quickly in succession, running into the issue where Git for Windows chooses not to populate the inode and device numbers in the stat data (this is a noticeable performance optimization). As a consequence, Git thinks the file is unchanged, and fails to pick up a modification. And no, we cannot simply undo the performance optimization, it would make things prohibitively slow in particular in large worktrees, and it is not like the bug is likely to be hit in reality: for Git to be fooled into thinking that a file is unchanged, it has to be written with the same file size, and within a 100ns time bucket (it is pretty improbable that there is any real-world scenario that would run into that, except of course our regression test suite).

This patch works around this issue by forcing Git to recognize the new file versions as new files (which they really are: the patch simply replaces

git mv <old> <new> && mv <file> <new> && git add <new>`

by

git rm <old> && mv <file> <new> && git add <new>`

which is not shorter, but even a performance improvement (an unnoticeable one, of course).

Johannes Schindelin (1):
  t6042: work around speed optimization on Windows

 t/t6042-merge-rename-corner-cases.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

base-commit: 77556354bb7ac50450e3b28999e3576969869068
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-109%2Fdscho%2Ffix-t6042-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-109/dscho/fix-t6042-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/109