Paweł Gronowski
88df5b627e
Clearing the daemon umask means creation sites can no longer rely on umask 0022 to remove group/other-write bits from permissive modes. Adjust modes for daemon-owned files that previously depended on the old umask: - fuse-overlayfs lower file - goroutine stack dump file - layer migration tar-data file - network namespace mount file Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
60 lines
1.3 KiB
Go
60 lines
1.3 KiB
Go
package stack
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import (
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"fmt"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"time"
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"github.com/pkg/errors"
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)
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const stacksLogNameTemplate = "goroutine-stacks-%s.log"
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// Dump outputs the runtime stack to os.StdErr.
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func Dump() {
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_ = dump(os.Stderr)
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}
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// DumpToFile appends the runtime stack into a file named "goroutine-stacks-<timestamp>.log"
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// in dir and returns the full path to that file. If no directory name is
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// provided, it outputs to os.Stderr.
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func DumpToFile(dir string) (string, error) {
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var f *os.File
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if dir != "" {
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path := filepath.Join(dir, fmt.Sprintf(stacksLogNameTemplate, strings.ReplaceAll(time.Now().Format(time.RFC3339), ":", "")))
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var err error
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f, err = os.OpenFile(path, os.O_CREATE|os.O_WRONLY, 0o644)
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if err != nil {
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return "", errors.Wrap(err, "failed to open file to write the goroutine stacks")
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}
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defer func() {
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_ = f.Sync()
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_ = f.Close()
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}()
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} else {
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f = os.Stderr
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}
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return f.Name(), dump(f)
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}
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func dump(f *os.File) error {
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var (
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buf []byte
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stackSize int
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)
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bufferLen := 16384
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for stackSize == len(buf) {
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buf = make([]byte, bufferLen)
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stackSize = runtime.Stack(buf, true)
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bufferLen *= 2
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}
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buf = buf[:stackSize]
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if _, err := f.Write(buf); err != nil {
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return errors.Wrap(err, "failed to write goroutine stacks")
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}
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return nil
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}
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