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// Copyright (c) 2023, 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 rpm
import (
"errors"
"fmt"
"os/exec"
"strings"
)
var ErrMacroUndefined = errors.New("macro is not defined")
// GetMacro returns the value of the provided macro name
func GetMacro(name string) (value string, err error) {
rpm, err := exec.LookPath("rpm")
if err != nil {
return "", fmt.Errorf("rpm command not found: %w", err)
}
args := []string{"--eval", "%{" + name + "}"}
cmd := exec.Command(rpm, args...)
out, err := cmd.CombinedOutput()
if err != nil {
return "", fmt.Errorf("while looking up value of rpm macro %s: %s", name, err)
}
eval := strings.TrimSuffix(string(out), "\n")
if eval == "%{"+name+"}" {
return "", ErrMacroUndefined
}
return eval, nil
}
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