Script to reproduce bug in pdfTeX when using the subfolder option

bugreport.sh

#!/bin/bash

#
# Script to reproduce an issue with pdftex
# 
# The issue occurs when
#   - you are using the -output-folder option
#   - you input some subfile without extension
#   - a folder with that subfile name appears in that output folder
#
# Running this script will create $ROOTDIR, and an example document under $ROOTDIR
# In that folder will be 3 PDFs all of which I would expect to be the same
# However the third PDF will be missing content

ROOTDIR="/tmp/rootdir"
SUBDIRNAME="subdir"
ROOTFILENAME="main"

ROOTFILE="$ROOTDIR/$ROOTFILENAME.tex"
SUBDIR="$ROOTDIR/$SUBDIRNAME"
SUBFILE="$ROOTDIR/$SUBDIRNAME.tex"
OUTPUTFOLDER="$ROOTDIR/outputfolder"

# prepare the document
mkdir -p "$SUBDIR"
mkdir -p "$OUTPUTFOLDER"
echo "\\documentclass{article}" > "$ROOTFILE"
echo "\\begin{document}" >> "$ROOTFILE"
echo "1" >> "$ROOTFILE"
echo "\\input{$SUBDIRNAME}" >> "$ROOTFILE"
echo "2" > "$SUBFILE"
echo "3" >> "$ROOTFILE"
echo "\\end{document}" >> "$ROOTFILE"

# 1. Typeset without output folder, with the subfolder, this works fine
cd "$ROOTDIR"
pdflatex "$ROOTFILENAME"
mv "$ROOTFILENAME.pdf" "1-no-output-folder.pdf"
rm *.log *.aux

# 2. Typeset with the output folder, but without the problematic sub folder
pdflatex -output-directory "$OUTPUTFOLDER" "$ROOTFILENAME"  
mv "$OUTPUTFOLDER/$ROOTFILENAME.pdf" "2-output-folder-no-subfolder.pdf"
rm "$OUTPUTFOLDER"/*.log "$OUTPUTFOLDER"/*.aux

# 3. Create the obscuring subfolder in the output folder, then typeset again, this pdf will be missing content
mkdir -p "$OUTPUTFOLDER/$SUBDIRNAME"
pdflatex -output-directory "$OUTPUTFOLDER" "$ROOTFILENAME"  
mv "$OUTPUTFOLDER/$ROOTFILENAME.pdf" "3-output-folder-with-subfolder.pdf"
rm "$OUTPUTFOLDER"/*.log "$OUTPUTFOLDER"/*.aux