mirror of
https://github.com/Luzifer/duplicity-backup.git
synced 2024-12-22 19:41:21 +00:00
55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
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package which
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import (
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"errors"
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"os"
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"path"
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"strings"
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)
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// Common named errors to match in programs using this library
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var (
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ErrBinaryNotFound = errors.New("Requested binary was not found")
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ErrNoSearchSpecified = errors.New("You need to specify a binary to search")
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)
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// FindInPath searches the specified binary in directories listed in $PATH and returns first match
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func FindInPath(binary string) (string, error) {
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pathEnv := os.Getenv("PATH")
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if len(pathEnv) == 0 {
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return "", errors.New("Found empty $PATH, not able to search $PATH")
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}
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for _, part := range strings.Split(pathEnv, ":") {
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if len(part) == 0 {
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continue
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}
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if found, err := FindInDirectory(binary, part); err != nil {
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return "", err
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} else if found {
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return path.Join(part, binary), nil
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}
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}
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return "", ErrBinaryNotFound
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}
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// FindInDirectory checks whether the specified file is present in the directory
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func FindInDirectory(binary, directory string) (bool, error) {
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if len(binary) == 0 {
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return false, ErrNoSearchSpecified
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}
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_, err := os.Stat(path.Join(directory, binary))
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switch {
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case err == nil:
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return true, nil
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case os.IsNotExist(err):
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return false, nil
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default:
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return false, err
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}
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}
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