#!/bin/sh

set -e
set -u

go install github.com/google/go-licenses@v1.6.0

if [ -d "vendor" ]; then
    echo "Please remove vendor directory before running this script"
    exit 255
fi

if [ ! -f "go.mod" ]; then
    echo "This script must be called from the project root directory,"
    echo "i.e. as scripts/update-license-dependencise.sh"
    exit 255
fi

# Exclude ourselves
exclude="github.com/hpcng/warewulf"

# Ensure a constant sort order
export LC_ALL=C

go-licenses csv ./... | grep -v -E "${exclude}" | sort -k3,3 -k1,1 -t, > LICENSE_DEPENDENCIES.csv

# Header for the markdown file
cat <<-'EOF' >LICENSE_DEPENDENCIES.md
# Dependency Licenses

This project uses a number of dependencies, in accordance with their
own license terms. These dependencies are managed via the project
`go.mod` and `go.sum` files, and included in a `vendor/` directory in
our official source tarballs.

A full build or package of Warewulf uses all dependencies listed
below. If you `import "github.com/hpcng/warewulf"` into your own
project then you may use a subset of them.

The dependencies and their licenses are as follows:

EOF

while IFS="," read -r dep url license; do
    {
	echo "## ${dep}"
	echo ""
	echo "**License:** ${license}"
	echo ""
    } >>LICENSE_DEPENDENCIES.md

    # go-licenses can't work out the web url for non-github projects.
    # Fall back to using the dependency URL as a project URL
    if [ "${url}" = "Unknown" ]; then
	echo "**Project URL:** <https://${dep}>" >>LICENSE_DEPENDENCIES.md
    else
	echo "**License URL:** <${url}>" >>LICENSE_DEPENDENCIES.md
    fi
    echo "" >>LICENSE_DEPENDENCIES.md
done <LICENSE_DEPENDENCIES.csv

# Clean up
rm LICENSE_DEPENDENCIES.csv