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logpolicy: fix config initialization bug (#5010)

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If ConfigFromFile cannot find the configuration file,
we must not initialize it with NewConfig.
Instead, we need it to fail validation so that it eventually writes
a newly constructed configuration file.
Otherwise, new tailscale instances will never be able store a persistent
log config and start with a new config file upon every bootup.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
This commit is contained in:
Joe Tsai 2022-07-05 18:27:31 -07:00 committed by GitHub
parent d6817d0f22
commit fe3426b4c7
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 3 deletions
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7
logpolicy/logpolicy.go
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@ -112,6 +112,8 @@ func NewConfig(collection string) *Config {
// and that the PrivateID and PublicID pair are sensible.
func (c *Config) Validate(collection string) error {
switch {
case c == nil:
return errors.New("config is nil")
case c.Collection != collection:
return fmt.Errorf("config collection %q does not match %q", c.Collection, collection)
case c.PrivateID.IsZero():
@ -509,11 +511,10 @@ func New(collection string) *Policy {
newc, err := ConfigFromFile(cfgPath)
if err != nil {
earlyLogf("logpolicy.ConfigFromFile %v: %v", cfgPath, err)
newc = NewConfig(collection)
}
if err := newc.Validate(collection); err != nil {
earlyLogf("logpolicy.Config.Validate for %q: %v", cfgPath, err)
newc := NewConfig(collection)
earlyLogf("logpolicy.Config.Validate for %v: %v", cfgPath, err)
newc = NewConfig(collection)
if err := newc.Save(cfgPath); err != nil {
earlyLogf("logpolicy.Config.Save for %v: %v", cfgPath, err)
}