Shell script to create (and update) a git mirror of a fossil repository

fossil_to_git.sh

#!/usr/bin/env bash

# This script should be called from a bare git repository

# $1 should contain the path to the fossil file to export
[ -z "$1" ] && exit 1

[ -f tmp_export_file ] && rm tmp_export_file

fossil export --git "$1" > tmp_export_file
sed -i "s/fossil_user <fossil_user>/Étienne Deparis <mon@mail.tld>/g" tmp_export_file

cat tmp_export_file | git fast-import

if [ -n "$2" -a "$2" = 'github' ]; then
    GITHUB_TARGET=$(git remote -v | grep 'github.com:milouse' | head -n1 | cut -f1)
    git push $GITHUB_TARGET trunk
fi