forked from TrueCloudLab/distribution
121 lines
2.7 KiB
Go
121 lines
2.7 KiB
Go
package storage
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import (
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"errors"
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"io"
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"path"
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"strings"
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"github.com/docker/distribution/context"
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"github.com/docker/distribution/registry/storage/driver"
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)
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// Returns a list, or partial list, of repositories in the registry.
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// Because it's a quite expensive operation, it should only be used when building up
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// an initial set of repositories.
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func (reg *registry) Repositories(ctx context.Context, repos []string, last string) (n int, err error) {
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var foundRepos []string
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if len(repos) == 0 {
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return 0, errors.New("no space in slice")
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}
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root, err := pathFor(repositoriesRootPathSpec{})
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if err != nil {
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return 0, err
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}
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// errFinishedWalk signals an early exit to the walk when the current query
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// is satisfied.
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errFinishedWalk := errors.New("finished walk")
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err = Walk(ctx, reg.blobStore.driver, root, func(fileInfo driver.FileInfo) error {
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filePath := fileInfo.Path()
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// lop the base path off
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repoPath := filePath[len(root)+1:]
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_, file := path.Split(repoPath)
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if file == "_layers" {
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repoPath = strings.TrimSuffix(repoPath, "/_layers")
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if pathGreaterThan(repoPath, last) {
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foundRepos = append(foundRepos, repoPath)
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}
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return ErrSkipDir
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} else if strings.HasPrefix(file, "_") {
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return ErrSkipDir
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}
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// if we've filled our array, no need to walk any further
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if len(foundRepos) == len(repos) {
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return errFinishedWalk
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}
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return nil
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})
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n = copy(repos, foundRepos)
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switch err {
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case nil:
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// nil means that we completed walk and didn't fill buffer. No more
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// records are available.
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err = io.EOF
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case errFinishedWalk:
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// more records are available.
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err = nil
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}
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return n, err
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}
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// Enumerate applies ingester to each repository
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func (reg *registry) Enumerate(ctx context.Context, ingester func(string) error) error {
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repoNameBuffer := make([]string, 100)
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var last string
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for {
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n, err := reg.Repositories(ctx, repoNameBuffer, last)
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if err != nil && err != io.EOF {
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return err
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}
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if n == 0 {
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break
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}
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last = repoNameBuffer[n-1]
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for i := 0; i < n; i++ {
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repoName := repoNameBuffer[i]
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err = ingester(repoName)
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if err != nil {
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return err
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}
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}
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if err == io.EOF {
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break
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}
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}
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return nil
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}
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func pathGreaterThan(pathX, pathY string) (b bool) {
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splitPathX := strings.SplitN(pathX, "/", 2)
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splitPathY := strings.SplitN(pathY, "/", 2)
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if splitPathX[0] == splitPathY[0] {
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if len(splitPathX) == 1 && len(splitPathY) == 1 {
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return false
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} else if len(splitPathX) == 1 && len(splitPathY) != 1 {
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return false
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} else if len(splitPathX) != 1 && len(splitPathY) == 1 {
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return true
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}
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return pathGreaterThan(splitPathX[1], splitPathY[1])
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}
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return splitPathX[0] > splitPathY[0]
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}
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