#!/bin/bash

set -e
set -o pipefail

tmp=.git/dgit-badcommit-fixup-tmp
rm -rf $tmp
mkdir $tmp

LC_MESSAGES=C git fsck --no-dangling 2>&1 | \
 perl -ne 'print $1 if m/^error in commit d1a977e7f9637372750ac02a58e85c35ddd4ca54:.*invalid format - expected '\''committer' | \
 >$tmp/bad

case `wc -l <$tmp/bad` in
    0)
	echo >&2 'nothing bad found - is git-fsck doing as we expect?' ;
	exit 8 ;;
    1)
	read <$tmp/bad bads
	nots="^$onlybad^0 ^$onlybad^1"
	;;
    *)
	bads="cat $tmp/bad"
	;;
esac

args="$nots"

for head in `git-show-ref --heads`; do
    exec <$tmp/bad
    needed=false
    for bad in $bads; do
	if git merge-base --is-ancestor $bad $head; then
	    needed=true
	    break
	fi
    done 
    if ! $needed; then continue; fi
    args+=" $head"
done

echo $args