net/dns: retry overwriting hosts file on Windows

Updates #5753

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I60f81bd3325d5ba5383b947c7a7aaa5b14e460f6
pull/6465/head
Andrew Dunham 2 years ago
parent 3a5d02cb31
commit ec790e58df

@ -167,7 +167,16 @@ func (m *windowsManager) setHosts(hosts []*HostEntry) error {
return err return err
} }
const fileMode = 0 // ignored on windows. const fileMode = 0 // ignored on windows.
return atomicfile.WriteFile(hostsFile, outB, fileMode)
// This can fail spuriously with an access denied error, so retry it a
// few times.
for i := 0; i < 5; i++ {
if err = atomicfile.WriteFile(hostsFile, outB, fileMode); err == nil {
return nil
}
time.Sleep(10 * time.Millisecond)
}
return err
} }
// setPrimaryDNS sets the given resolvers and domains as the Tailscale // setPrimaryDNS sets the given resolvers and domains as the Tailscale

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