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boot: checkPortAvailability() should fail only for EADDRINUSE error and ignore other errors. (#2527)
fixes #2510
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parent
07506358ff
commit
45c928e2f5
@ -19,6 +19,8 @@ package cmd
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import (
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import (
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"fmt"
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"fmt"
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"net"
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"net"
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"os"
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"syscall"
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)
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)
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// Make sure that none of the other processes are listening on the
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// Make sure that none of the other processes are listening on the
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@ -35,7 +37,13 @@ func checkPortAvailability(port int) error {
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for _, n := range network {
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for _, n := range network {
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l, err := net.Listen(n, fmt.Sprintf(":%d", port))
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l, err := net.Listen(n, fmt.Sprintf(":%d", port))
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if err != nil {
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if err != nil {
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return err
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if isAddrInUse(err) {
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// Return error if another process is listening on the
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// same port.
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return err
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}
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// Ignore any other error (ex. EAFNOSUPPORT)
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continue
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}
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}
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// look for error so we don't have dangling connection
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// look for error so we don't have dangling connection
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@ -46,3 +54,18 @@ func checkPortAvailability(port int) error {
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return nil
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return nil
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}
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}
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// Return true if err is "address already in use" error.
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// syscall.EADDRINUSE is available on all OSes.
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func isAddrInUse(err error) bool {
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if opErr, ok := err.(*net.OpError); ok {
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if sysErr, ok := opErr.Err.(*os.SyscallError); ok {
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if errno, ok := sysErr.Err.(syscall.Errno); ok {
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if errno == syscall.EADDRINUSE {
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return true
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}
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}
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}
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}
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return false
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}
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