Fix broken repo

gistfile1.sh

#!/usr/bin/env bash
function clean_invalid_refs() {
    INVALID_SHAS=`git for-each-ref --format="%(objectname)" | sort | uniq | git cat-file --batch-check | grep missing | cut -d' ' -f 1`;
    if [ -z "${INVALID_SHAS}" ]; then
        echo "Nothing to cleanup" > /dev/stderr
        return
    fi
    
    REGEX=$(echo "$INVALID_SHAS" | paste -sd '|')
    REFS=`git for-each-ref --format="%(refname) %(objectname)" | grep -E $REGEX | cut -d' ' -f 1`
    for ref in $REFS; do
        echo "deleting ${ref}"
        git update-ref -d ${ref}
    done
}

clean_invalid_refs

git fetch "$@"