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https://github.com/k3s-io/k3s.git
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69 lines
2.0 KiB
Go
69 lines
2.0 KiB
Go
package backuptar
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import (
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"archive/tar"
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"fmt"
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"strconv"
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"strings"
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"time"
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)
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// Functions copied from https://github.com/golang/go/blob/master/src/archive/tar/strconv.go
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// as we need to manage the LIBARCHIVE.creationtime PAXRecord manually.
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// Idea taken from containerd which did the same thing.
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// parsePAXTime takes a string of the form %d.%d as described in the PAX
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// specification. Note that this implementation allows for negative timestamps,
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// which is allowed for by the PAX specification, but not always portable.
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func parsePAXTime(s string) (time.Time, error) {
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const maxNanoSecondDigits = 9
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// Split string into seconds and sub-seconds parts.
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ss, sn := s, ""
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if pos := strings.IndexByte(s, '.'); pos >= 0 {
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ss, sn = s[:pos], s[pos+1:]
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}
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// Parse the seconds.
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secs, err := strconv.ParseInt(ss, 10, 64)
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if err != nil {
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return time.Time{}, tar.ErrHeader
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}
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if len(sn) == 0 {
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return time.Unix(secs, 0), nil // No sub-second values
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}
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// Parse the nanoseconds.
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if strings.Trim(sn, "0123456789") != "" {
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return time.Time{}, tar.ErrHeader
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}
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if len(sn) < maxNanoSecondDigits {
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sn += strings.Repeat("0", maxNanoSecondDigits-len(sn)) // Right pad
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} else {
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sn = sn[:maxNanoSecondDigits] // Right truncate
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}
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nsecs, _ := strconv.ParseInt(sn, 10, 64) // Must succeed
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if len(ss) > 0 && ss[0] == '-' {
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return time.Unix(secs, -1*nsecs), nil // Negative correction
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}
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return time.Unix(secs, nsecs), nil
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}
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// formatPAXTime converts ts into a time of the form %d.%d as described in the
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// PAX specification. This function is capable of negative timestamps.
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func formatPAXTime(ts time.Time) (s string) {
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secs, nsecs := ts.Unix(), ts.Nanosecond()
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if nsecs == 0 {
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return strconv.FormatInt(secs, 10)
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}
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// If seconds is negative, then perform correction.
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sign := ""
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if secs < 0 {
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sign = "-" // Remember sign
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secs = -(secs + 1) // Add a second to secs
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nsecs = -(nsecs - 1e9) // Take that second away from nsecs
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}
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return strings.TrimRight(fmt.Sprintf("%s%d.%09d", sign, secs, nsecs), "0")
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}
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