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ipn: treat zero-length file state store file as missing

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Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2020-11-06 12:56:24 -08:00
parent 119101962c
commit e369e8b921
1 changed files with 9 additions and 0 deletions
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9
ipn/store.go
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@ -10,6 +10,7 @@ import (
"errors" "errors"
"fmt" "fmt"
"io/ioutil" "io/ioutil"
"log"
"os" "os"
"path/filepath" "path/filepath"
"sync" "sync"
@ -100,6 +101,14 @@ func (s *FileStore) String() string { return fmt.Sprintf("FileStore(%q)", s.path
// NewFileStore returns a new file store that persists to path. // NewFileStore returns a new file store that persists to path.
func NewFileStore(path string) (*FileStore, error) { func NewFileStore(path string) (*FileStore, error) {
bs, err := ioutil.ReadFile(path) bs, err := ioutil.ReadFile(path)
// Treat an empty file as a missing file.
// (https://github.com/tailscale/tailscale/issues/895#issuecomment-723255589)
if err == nil && len(bs) == 0 {
log.Printf("ipn.NewFileStore(%q): file empty; treating it like a missing file [warning]", path)
err = os.ErrNotExist
}
if err != nil { if err != nil {
if os.IsNotExist(err) { if os.IsNotExist(err) {
// Write out an initial file, to verify that we can write // Write out an initial file, to verify that we can write