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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"
"regexp"
"github.com/sylabs/singularity/v4/pkg/sylog"
)
var hostRegex = `^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])$`
// Hostname creates a hostname content with provided hostname and returns it
func Hostname(hostname string) (content []byte, err error) {
sylog.Verbosef("Creating hostname content\n")
if hostname == "" {
return content, fmt.Errorf("no hostname provided")
}
r := regexp.MustCompile(hostRegex)
if !r.MatchString(hostname) {
return content, fmt.Errorf("%s is not a valid hostname", hostname)
}
line := fmt.Sprintf("%s\n", hostname)
content = append(content, line...)
return content, nil
}
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