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package fstestutil
import (
"fmt"
"io/ioutil"
"os"
)
// FileInfoCheck is a function that validates an os.FileInfo according
// to some criteria.
type FileInfoCheck func(fi os.FileInfo) error
type checkDirError struct {
missing map[string]struct{}
extra map[string]os.FileMode
}
func (e *checkDirError) Error() string {
return fmt.Sprintf("wrong directory contents: missing %v, extra %v", e.missing, e.extra)
}
// CheckDir checks the contents of the directory at path, making sure
// every directory entry listed in want is present. If the check is
// not nil, it must also pass.
//
// If want contains the impossible filename "", unexpected files are
// checked with that. If the key is not in want, unexpected files are
// an error.
//
// Missing entries, that are listed in want but not seen, are an
// error.
func CheckDir(path string, want map[string]FileInfoCheck) error {
problems := &checkDirError{
missing: make(map[string]struct{}, len(want)),
extra: make(map[string]os.FileMode),
}
for k := range want {
if k == "" {
continue
}
problems.missing[k] = struct{}{}
}
fis, err := ioutil.ReadDir(path)
if err != nil {
return fmt.Errorf("cannot read directory: %v", err)
}
for _, fi := range fis {
check, ok := want[fi.Name()]
if !ok {
check, ok = want[""]
}
if !ok {
problems.extra[fi.Name()] = fi.Mode()
continue
}
delete(problems.missing, fi.Name())
if check != nil {
if err := check(fi); err != nil {
return fmt.Errorf("check failed: %v: %v", fi.Name(), err)
}
}
}
if len(problems.missing) > 0 || len(problems.extra) > 0 {
return problems
}
return nil
}
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