repro script for "did not find object for shallow ..." bug

repro.sh

#!/bin/bash

TOPDIR=`mktemp -d -t git-repro`
ORIGIN=$TOPDIR/origin
rm -rf $ORIGIN
git init --bare $ORIGIN

## 'good' repo will commit properly
GOOD=$TOPDIR/good
rm -rf $GOOD
git clone file://$ORIGIN $GOOD

## 'evil' repo will stomp 'good' commits
EVIL=$TOPDIR/evil
rm -rf $EVIL
git clone file://$ORIGIN $EVIL

## 'shallow' repo just wants everyone to get along
SHALLOW=$TOPDIR/shallow
rm -rf $SHALLOW

## push 2 commits. I'm not sure why 1 does not reproduce the issue.
cd $GOOD
echo "1" >> 1
git add 1
git commit -a -m 1
echo "2" >> 2
git add 2
git commit -a -m 2
git push origin master

## shallow: ok!
git clone --depth 1 file://$ORIGIN $SHALLOW
cd $SHALLOW

## push --force one commit, stomping the two 'good' commits
cd $EVIL
echo "3" >> 3
git add 3
git commit -a -m 3
git push --force origin master

## important: origin cleans up un-referenced blobs...
cd $ORIGIN
git gc --prune=now

## shallow: not ok.
cd $SHALLOW
git fetch

rm -rf $TOPDIR