Triggering "BUG: wt-status.c:476: multiple renames on the same target? how?"

[Andrea Stacchiotti <andreastacchiotti@gmail.com>]

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Dear maintainer(s),

the following script, when executed with git 2.19 triggers the bug in
the subject line.
The problem seems to be the interaction between add -N and rename detection.

The git binary used is the one currently packaged in Debian unstable.

I have searched the list for the bug text and have found nothing,
apologies if the bug is already known.

System information, script content and script output follow.

Andrea Stacchiotti

--------------------------

andreas@trelitri:/tmp$ uname -a
Linux trelitri 4.17.0-3-amd64 #1 SMP Debian 4.17.17-1 (2018-08-18)
x86_64 GNU/Linux
andreas@trelitri:/tmp$ git --version
git version 2.19.0

andreas@trelitri:/tmp$ cat bugscript.sh
# Make a test repo
git init testrepo
cd testrepo
git config user.name A
git config user.email B

# Add a file called orig
echo 'a' > orig
git add orig
git commit -m'orig'

# Copy orig in new and modify orig
cp orig new
echo 'b' > orig

# add -N and then commit trigger the bug
git add -N new
git commit

# Cleanup
cd ..
rm -rf testrepo

andreas@trelitri:/tmp$ LANG=C ./bugscript.sh
Initialized empty Git repository in /tmp/testrepo/.git/
[master (root-commit) 5dedf30] orig
 1 file changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 orig
BUG: wt-status.c:476: multiple renames on the same target? how?
./bugscript.sh: line 18: 22762 Aborted                 git commit

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