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d1faf3df27
Redefine a better interface for remote context dependency. Separate Dockerfile build instruction from remote context. Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
128 lines
3.2 KiB
Go
128 lines
3.2 KiB
Go
package remotecontext
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import (
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"io"
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"os"
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"path/filepath"
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"github.com/docker/docker/builder"
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/chrootarchive"
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"github.com/docker/docker/pkg/ioutils"
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"github.com/docker/docker/pkg/symlink"
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"github.com/docker/docker/pkg/tarsum"
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"github.com/pkg/errors"
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)
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type tarSumContext struct {
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root string
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sums tarsum.FileInfoSums
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}
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func (c *tarSumContext) Close() error {
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return os.RemoveAll(c.root)
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}
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func convertPathError(err error, cleanpath string) error {
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if err, ok := err.(*os.PathError); ok {
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err.Path = cleanpath
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return err
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}
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return err
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}
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type modifiableContext interface {
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builder.Source
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// Remove deletes the entry specified by `path`.
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// It is usual for directory entries to delete all its subentries.
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Remove(path string) error
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}
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// MakeTarSumContext returns a build Context from a tar stream.
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//
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// It extracts the tar stream to a temporary folder that is deleted as soon as
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// the Context is closed.
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// As the extraction happens, a tarsum is calculated for every file, and the set of
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// all those sums then becomes the source of truth for all operations on this Context.
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//
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// Closing tarStream has to be done by the caller.
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func MakeTarSumContext(tarStream io.Reader) (builder.Source, error) {
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root, err := ioutils.TempDir("", "docker-builder")
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if err != nil {
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return nil, err
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}
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tsc := &tarSumContext{root: root}
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// Make sure we clean-up upon error. In the happy case the caller
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// is expected to manage the clean-up
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defer func() {
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if err != nil {
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tsc.Close()
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}
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}()
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decompressedStream, err := archive.DecompressStream(tarStream)
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if err != nil {
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return nil, err
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}
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sum, err := tarsum.NewTarSum(decompressedStream, true, tarsum.Version1)
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if err != nil {
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return nil, err
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}
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err = chrootarchive.Untar(sum, root, nil)
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if err != nil {
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return nil, err
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}
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tsc.sums = sum.GetSums()
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return tsc, nil
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}
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func (c *tarSumContext) Root() string {
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return c.root
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}
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func (c *tarSumContext) Remove(path string) error {
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_, fullpath, err := normalize(path, c.root)
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if err != nil {
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return err
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}
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return os.RemoveAll(fullpath)
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}
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func (c *tarSumContext) Hash(path string) (string, error) {
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cleanpath, fullpath, err := normalize(path, c.root)
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if err != nil {
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return "", err
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}
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rel, err := filepath.Rel(c.root, fullpath)
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if err != nil {
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return "", convertPathError(err, cleanpath)
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}
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// Use the checksum of the followed path(not the possible symlink) because
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// this is the file that is actually copied.
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if tsInfo := c.sums.GetFile(filepath.ToSlash(rel)); tsInfo != nil {
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return tsInfo.Sum(), nil
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}
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// We set sum to path by default for the case where GetFile returns nil.
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// The usual case is if relative path is empty.
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return path, nil // backwards compat TODO: see if really needed
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}
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func normalize(path, root string) (cleanPath, fullPath string, err error) {
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cleanPath = filepath.Clean(string(os.PathSeparator) + path)[1:]
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fullPath, err = symlink.FollowSymlinkInScope(filepath.Join(root, path), root)
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if err != nil {
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return "", "", errors.Wrapf(err, "forbidden path outside the build context: %s (%s)", path, cleanPath)
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}
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if _, err := os.Lstat(fullPath); err != nil {
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return "", "", convertPathError(err, path)
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}
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return
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}
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