3611efdcef
This includes an update of the selinux package and the ability in the CRI configuration to set the upper bounds for the selinux category labels that are generated. Signed-off-by: Michael Crosby <michael@thepasture.io>
104 lines
2.3 KiB
Go
104 lines
2.3 KiB
Go
package pwalk
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import (
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"os"
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"path/filepath"
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"runtime"
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"sync"
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"github.com/pkg/errors"
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)
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type WalkFunc = filepath.WalkFunc
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// Walk is a wrapper for filepath.Walk which can call multiple walkFn
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// in parallel, allowing to handle each item concurrently. A maximum of
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// twice the runtime.NumCPU() walkFn will be called at any one time.
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// If you want to change the maximum, use WalkN instead.
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//
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// The order of calls is non-deterministic.
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//
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// Note that this implementation only supports primitive error handling:
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//
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// * no errors are ever passed to WalkFn
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//
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// * once a walkFn returns any error, all further processing stops
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// and the error is returned to the caller of Walk;
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//
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// * filepath.SkipDir is not supported;
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//
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// * if more than one walkFn instance will return an error, only one
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// of such errors will be propagated and returned by Walk, others
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// will be silently discarded.
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//
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func Walk(root string, walkFn WalkFunc) error {
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return WalkN(root, walkFn, runtime.NumCPU()*2)
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}
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// WalkN is a wrapper for filepath.Walk which can call multiple walkFn
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// in parallel, allowing to handle each item concurrently. A maximum of
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// num walkFn will be called at any one time.
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func WalkN(root string, walkFn WalkFunc, num int) error {
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// make sure limit is sensible
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if num < 1 {
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return errors.Errorf("walk(%q): num must be > 0", root)
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}
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files := make(chan *walkArgs, 2*num)
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errCh := make(chan error, 1) // get the first error, ignore others
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// Start walking a tree asap
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var (
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err error
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wg sync.WaitGroup
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)
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wg.Add(1)
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go func() {
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err = filepath.Walk(root, func(p string, info os.FileInfo, err error) error {
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if err != nil {
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close(files)
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return err
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}
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// add a file to the queue unless a callback sent an error
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select {
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case e := <-errCh:
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close(files)
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return e
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default:
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files <- &walkArgs{path: p, info: &info}
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return nil
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}
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})
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if err == nil {
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close(files)
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}
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wg.Done()
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}()
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wg.Add(num)
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for i := 0; i < num; i++ {
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go func() {
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for file := range files {
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if e := walkFn(file.path, *file.info, nil); e != nil {
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select {
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case errCh <- e: // sent ok
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default: // buffer full
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}
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}
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}
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wg.Done()
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}()
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}
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wg.Wait()
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return err
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}
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// walkArgs holds the arguments that were passed to the Walk or WalkLimit
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// functions.
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type walkArgs struct {
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path string
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info *os.FileInfo
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}
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