/
fileutil.go
48 lines (45 loc) · 1.2 KB
/
fileutil.go
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// Package fileutil provides file utility functions, complementing the
// lower level abstractions found in the standard library.
package fileutil
import (
"errors"
"os"
)
// IsReadableFile reports whether the file exists and is readable.
// If the error is non-nil, it means there might be a file or directory
// with that name but we cannot read it.
//
// Adapted from the upspin.io source code.
func IsReadableFile(path string) (bool, error) {
// Is it stattable and is it a plain file?
info, err := os.Stat(path)
if err != nil {
if os.IsNotExist(err) {
return false, nil // Item does not exist.
}
return false, err // Item is problematic.
}
if info.IsDir() {
return false, errors.New("is directory")
}
// Is it readable?
fd, err := os.Open(path)
if err != nil {
return false, errors.New("permission denied")
}
fd.Close()
return true, nil // Item exists and is readable.
}
// Getwd returns a rooted path name corresponding to the
// current directory. If the current directory can be
// reached via multiple paths (due to symbolic links),
// Getwd may return any one of them.
//
// On failure, will return "."
func Getwd() string {
p, err := os.Getwd()
if err != nil {
return "."
}
return p
}