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package main
// Borrowed from Concourse: https://github.com/concourse/atc/blob/master/atccmd/file_flag.go
import (
"fmt"
"os"
"path/filepath"
)
// FileFlag is a flag for passing a path to a file on disk. The file is
// expected to be a file, not a directory, that actually exists.
type FileFlag string
// UnmarshalFlag implements go-flag's Unmarshaler interface
func (f *FileFlag) UnmarshalFlag(value string) error {
stat, err := os.Stat(value)
if err != nil {
return err
}
if stat.IsDir() {
return fmt.Errorf("path '%s' is a directory, not a file", value)
}
abs, err := filepath.Abs(value)
if err != nil {
return err
}
*f = FileFlag(abs)
return nil
}
// Path is the path to the file
func (f FileFlag) Path() string {
return string(f)
}
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