git mv messed up file mapping if folders contain identical files

From: Bill Okara <billokara@gmail.com>
Date: Feb 24, 2016, 23:38 UTC
Message-ID: <CADsr5c_Hk34KBN06dM9Hk5HPW9-Mt3eZLMgvyes8sSgxCA-k0w@mail.gmail.com>

Hi,

I noticed the following 'git mv' issue with: git version 2.6.4

If there are identical files in different subfolders, 'git mv' the
root folder (and/or each file individually) will mess up the file path
mapping. that is, if having identical 'content.txt' file under
gitmvtest
    |--demo/content.txt
    |--dev/content.txt
    |--prod/content.txt

after doing the "git mv gitmvtest/resources gitmvtest/src/main/resources", the 'git status' will show:

renamed: gitmvtest/resources/demo/content.txt -> gitmvtest/src/main/resources/demo/content.txt renamed: gitmvtest/resources/prod/content.txt -> gitmvtest/src/main/resources/dev/content.txt <== NOTE: wrongly mapped the prod/content.txt to dev/content.txt renamed: gitmvtest/resources/dev/content.txt -> gitmvtest/src/main/resources/prod/content.txt <== NOTE: wrongly mapped the dev/content.txt to prod/content.txt

I tried running 'git mv' on each file individually, got the same problem:

> git mv gitmvtest/resources/demo/content.txt gitmvtest/src/main/resources/demo/content.txt
> git mv gitmvtest/resources/dev/content.txt gitmvtest/src/main/resources/dev/content.txt
> git mv gitmvtest/resources/prod/content.txt gitmvtest/src/main/resources/prod/content.txt

> git status

renamed: gitmvtest/resources/demo/content.txt -> gitmvtest/src/main/resources/demo/content.txt renamed: gitmvtest/resources/prod/content.txt -> gitmvtest/src/main/resources/dev/content.txt <== WRONG renamed: gitmvtest/resources/dev/content.txt -> gitmvtest/src/main/resources/prod/content.txt <== WRONG

NOTE: ======= if modified the content.txt in the 3 folders to contain different data, then repeating the above 'git mv' will produce correct result,

renamed: gitmvtest/resources/demo/content.txt -> gitmvtest/src/main/resources/demo/content.txt <== CORRECT renamed: gitmvtest/resources/dev/content.txt -> gitmvtest/src/main/resources/dev/content.txt <== CORRECT renamed: gitmvtest/resources/prod/content.txt -> gitmvtest/src/main/resources/prod/content.txt <== CORRECT

just want to see if this is a bug, user error (on my end), or??

Thanks, Bill