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// Copyright (c) 2018-2020, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package files
import (
"fmt"
"net"
"github.com/sylabs/singularity/v4/pkg/sylog"
)
// ResolvConf creates a resolv.conf content with provided dns list and returns it
func ResolvConf(dns []string) (content []byte, err error) {
sylog.Verbosef("Creating resolv.conf content\n")
if len(dns) == 0 {
return content, fmt.Errorf("no dns ip provided")
}
for _, ip := range dns {
if net.ParseIP(ip) == nil {
return content, fmt.Errorf("dns ip %s is not a valid IP address", ip)
}
line := fmt.Sprintf("nameserver %s\n", ip)
content = append(content, line...)
}
return content, nil
}
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