Move getContext… function to builder package
Signed-off-by: Vincent Demeester <vincent@sbr.pm>
This commit is contained in:
Vincent Demeester
parent
5627e400fe
commit
312f5e435b
6 changed files with 214 additions and 208 deletions
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@ -6,13 +6,10 @@ import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"path/filepath"
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"regexp"
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"runtime"
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"strings"
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"golang.org/x/net/context"
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@ -23,9 +20,6 @@ import (
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"github.com/docker/docker/opts"
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/fileutils"
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"github.com/docker/docker/pkg/gitutils"
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"github.com/docker/docker/pkg/httputils"
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"github.com/docker/docker/pkg/ioutils"
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"github.com/docker/docker/pkg/jsonmessage"
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flag "github.com/docker/docker/pkg/mflag"
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"github.com/docker/docker/pkg/progress"
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@ -103,13 +97,13 @@ func (cli *DockerCli) CmdBuild(args ...string) error {
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switch {
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case specifiedContext == "-":
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ctx, relDockerfile, err = getContextFromReader(cli.in, *dockerfileName)
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ctx, relDockerfile, err = builder.GetContextFromReader(cli.in, *dockerfileName)
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case urlutil.IsGitURL(specifiedContext):
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tempDir, relDockerfile, err = getContextFromGitURL(specifiedContext, *dockerfileName)
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tempDir, relDockerfile, err = builder.GetContextFromGitURL(specifiedContext, *dockerfileName)
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case urlutil.IsURL(specifiedContext):
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ctx, relDockerfile, err = getContextFromURL(progBuff, specifiedContext, *dockerfileName)
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ctx, relDockerfile, err = builder.GetContextFromURL(progBuff, specifiedContext, *dockerfileName)
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default:
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contextDir, relDockerfile, err = getContextFromLocalDir(specifiedContext, *dockerfileName)
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contextDir, relDockerfile, err = builder.GetContextFromLocalDir(specifiedContext, *dockerfileName)
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}
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if err != nil {
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@ -292,96 +286,6 @@ func validateTag(rawRepo string) (string, error) {
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return rawRepo, nil
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}
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// isUNC returns true if the path is UNC (one starting \\). It always returns
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// false on Linux.
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func isUNC(path string) bool {
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return runtime.GOOS == "windows" && strings.HasPrefix(path, `\\`)
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}
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// getDockerfileRelPath uses the given context directory for a `docker build`
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// and returns the absolute path to the context directory, the relative path of
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// the dockerfile in that context directory, and a non-nil error on success.
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func getDockerfileRelPath(givenContextDir, givenDockerfile string) (absContextDir, relDockerfile string, err error) {
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if absContextDir, err = filepath.Abs(givenContextDir); err != nil {
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return "", "", fmt.Errorf("unable to get absolute context directory: %v", err)
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}
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// The context dir might be a symbolic link, so follow it to the actual
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// target directory.
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//
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// FIXME. We use isUNC (always false on non-Windows platforms) to workaround
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// an issue in golang. On Windows, EvalSymLinks does not work on UNC file
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// paths (those starting with \\). This hack means that when using links
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// on UNC paths, they will not be followed.
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if !isUNC(absContextDir) {
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absContextDir, err = filepath.EvalSymlinks(absContextDir)
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if err != nil {
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return "", "", fmt.Errorf("unable to evaluate symlinks in context path: %v", err)
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}
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}
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stat, err := os.Lstat(absContextDir)
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if err != nil {
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return "", "", fmt.Errorf("unable to stat context directory %q: %v", absContextDir, err)
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}
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if !stat.IsDir() {
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return "", "", fmt.Errorf("context must be a directory: %s", absContextDir)
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}
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absDockerfile := givenDockerfile
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if absDockerfile == "" {
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// No -f/--file was specified so use the default relative to the
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// context directory.
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absDockerfile = filepath.Join(absContextDir, api.DefaultDockerfileName)
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// Just to be nice ;-) look for 'dockerfile' too but only
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// use it if we found it, otherwise ignore this check
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if _, err = os.Lstat(absDockerfile); os.IsNotExist(err) {
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altPath := filepath.Join(absContextDir, strings.ToLower(api.DefaultDockerfileName))
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if _, err = os.Lstat(altPath); err == nil {
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absDockerfile = altPath
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}
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}
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}
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// If not already an absolute path, the Dockerfile path should be joined to
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// the base directory.
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if !filepath.IsAbs(absDockerfile) {
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absDockerfile = filepath.Join(absContextDir, absDockerfile)
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}
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// Evaluate symlinks in the path to the Dockerfile too.
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//
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// FIXME. We use isUNC (always false on non-Windows platforms) to workaround
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// an issue in golang. On Windows, EvalSymLinks does not work on UNC file
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// paths (those starting with \\). This hack means that when using links
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// on UNC paths, they will not be followed.
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if !isUNC(absDockerfile) {
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absDockerfile, err = filepath.EvalSymlinks(absDockerfile)
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if err != nil {
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return "", "", fmt.Errorf("unable to evaluate symlinks in Dockerfile path: %v", err)
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}
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}
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if _, err := os.Lstat(absDockerfile); err != nil {
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if os.IsNotExist(err) {
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return "", "", fmt.Errorf("Cannot locate Dockerfile: %q", absDockerfile)
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}
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return "", "", fmt.Errorf("unable to stat Dockerfile: %v", err)
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}
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if relDockerfile, err = filepath.Rel(absContextDir, absDockerfile); err != nil {
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return "", "", fmt.Errorf("unable to get relative Dockerfile path: %v", err)
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}
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if strings.HasPrefix(relDockerfile, ".."+string(filepath.Separator)) {
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return "", "", fmt.Errorf("The Dockerfile (%s) must be within the build context (%s)", givenDockerfile, givenContextDir)
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}
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return absContextDir, relDockerfile, nil
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}
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// writeToFile copies from the given reader and writes it to a file with the
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// given filename.
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func writeToFile(r io.Reader, filename string) error {
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@ -398,107 +302,6 @@ func writeToFile(r io.Reader, filename string) error {
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return nil
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}
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// getContextFromReader will read the contents of the given reader as either a
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// Dockerfile or tar archive. Returns a tar archive used as a context and a
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// path to the Dockerfile inside the tar.
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func getContextFromReader(r io.ReadCloser, dockerfileName string) (out io.ReadCloser, relDockerfile string, err error) {
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buf := bufio.NewReader(r)
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magic, err := buf.Peek(archive.HeaderSize)
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if err != nil && err != io.EOF {
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return nil, "", fmt.Errorf("failed to peek context header from STDIN: %v", err)
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}
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if archive.IsArchive(magic) {
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return ioutils.NewReadCloserWrapper(buf, func() error { return r.Close() }), dockerfileName, nil
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}
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// Input should be read as a Dockerfile.
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tmpDir, err := ioutil.TempDir("", "docker-build-context-")
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if err != nil {
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return nil, "", fmt.Errorf("unbale to create temporary context directory: %v", err)
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}
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f, err := os.Create(filepath.Join(tmpDir, api.DefaultDockerfileName))
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if err != nil {
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return nil, "", err
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}
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_, err = io.Copy(f, buf)
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if err != nil {
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f.Close()
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return nil, "", err
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}
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if err := f.Close(); err != nil {
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return nil, "", err
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}
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if err := r.Close(); err != nil {
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return nil, "", err
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}
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tar, err := archive.Tar(tmpDir, archive.Uncompressed)
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if err != nil {
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return nil, "", err
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}
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return ioutils.NewReadCloserWrapper(tar, func() error {
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err := tar.Close()
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os.RemoveAll(tmpDir)
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return err
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}), api.DefaultDockerfileName, nil
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}
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// getContextFromGitURL uses a Git URL as context for a `docker build`. The
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// git repo is cloned into a temporary directory used as the context directory.
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// Returns the absolute path to the temporary context directory, the relative
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// path of the dockerfile in that context directory, and a non-nil error on
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// success.
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func getContextFromGitURL(gitURL, dockerfileName string) (absContextDir, relDockerfile string, err error) {
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if _, err := exec.LookPath("git"); err != nil {
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return "", "", fmt.Errorf("unable to find 'git': %v", err)
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}
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if absContextDir, err = gitutils.Clone(gitURL); err != nil {
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return "", "", fmt.Errorf("unable to 'git clone' to temporary context directory: %v", err)
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}
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return getDockerfileRelPath(absContextDir, dockerfileName)
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}
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// getContextFromURL uses a remote URL as context for a `docker build`. The
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// remote resource is downloaded as either a Dockerfile or a tar archive.
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// Returns the tar archive used for the context and a path of the
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// dockerfile inside the tar.
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func getContextFromURL(out io.Writer, remoteURL, dockerfileName string) (io.ReadCloser, string, error) {
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response, err := httputils.Download(remoteURL)
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if err != nil {
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return nil, "", fmt.Errorf("unable to download remote context %s: %v", remoteURL, err)
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}
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progressOutput := streamformatter.NewStreamFormatter().NewProgressOutput(out, true)
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// Pass the response body through a progress reader.
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progReader := progress.NewProgressReader(response.Body, progressOutput, response.ContentLength, "", fmt.Sprintf("Downloading build context from remote url: %s", remoteURL))
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return getContextFromReader(ioutils.NewReadCloserWrapper(progReader, func() error { return response.Body.Close() }), dockerfileName)
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}
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// getContextFromLocalDir uses the given local directory as context for a
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// `docker build`. Returns the absolute path to the local context directory,
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// the relative path of the dockerfile in that context directory, and a non-nil
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// error on success.
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func getContextFromLocalDir(localDir, dockerfileName string) (absContextDir, relDockerfile string, err error) {
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// When using a local context directory, when the Dockerfile is specified
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// with the `-f/--file` option then it is considered relative to the
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// current directory and not the context directory.
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if dockerfileName != "" {
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if dockerfileName, err = filepath.Abs(dockerfileName); err != nil {
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return "", "", fmt.Errorf("unable to get absolute path to Dockerfile: %v", err)
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}
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}
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return getDockerfileRelPath(localDir, dockerfileName)
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}
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var dockerfileFromLinePattern = regexp.MustCompile(`(?i)^[\s]*FROM[ \f\r\t\v]+(?P<image>[^ \f\r\t\v\n#]+)`)
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// resolvedTag records the repository, tag, and resolved digest reference
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@ -23,9 +23,6 @@ const (
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// MinVersion represents Minimum REST API version supported
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MinVersion version.Version = "1.12"
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// DefaultDockerfileName is the Default filename with Docker commands, read by docker build
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DefaultDockerfileName string = "Dockerfile"
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// NoBaseImageSpecifier is the symbol used by the FROM
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// command to specify that no base image is to be used.
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NoBaseImageSpecifier string = "scratch"
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@ -14,6 +14,11 @@ import (
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"github.com/docker/engine-api/types/container"
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)
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const (
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// DefaultDockerfileName is the Default filename with Docker commands, read by docker build
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DefaultDockerfileName string = "Dockerfile"
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)
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// Context represents a file system tree.
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type Context interface {
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// Close allows to signal that the filesystem tree won't be used anymore.
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@ -1,11 +1,23 @@
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package builder
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import (
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"bufio"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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"strings"
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/fileutils"
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"github.com/docker/docker/pkg/gitutils"
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"github.com/docker/docker/pkg/httputils"
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"github.com/docker/docker/pkg/ioutils"
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"github.com/docker/docker/pkg/progress"
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"github.com/docker/docker/pkg/streamformatter"
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)
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// ValidateContextDirectory checks if all the contents of the directory
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@ -55,3 +67,194 @@ func ValidateContextDirectory(srcPath string, excludes []string) error {
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return nil
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})
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}
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// GetContextFromReader will read the contents of the given reader as either a
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// Dockerfile or tar archive. Returns a tar archive used as a context and a
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// path to the Dockerfile inside the tar.
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func GetContextFromReader(r io.ReadCloser, dockerfileName string) (out io.ReadCloser, relDockerfile string, err error) {
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buf := bufio.NewReader(r)
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magic, err := buf.Peek(archive.HeaderSize)
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if err != nil && err != io.EOF {
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return nil, "", fmt.Errorf("failed to peek context header from STDIN: %v", err)
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}
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if archive.IsArchive(magic) {
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return ioutils.NewReadCloserWrapper(buf, func() error { return r.Close() }), dockerfileName, nil
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}
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// Input should be read as a Dockerfile.
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tmpDir, err := ioutil.TempDir("", "docker-build-context-")
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if err != nil {
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return nil, "", fmt.Errorf("unbale to create temporary context directory: %v", err)
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}
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f, err := os.Create(filepath.Join(tmpDir, DefaultDockerfileName))
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if err != nil {
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return nil, "", err
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}
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_, err = io.Copy(f, buf)
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if err != nil {
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f.Close()
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return nil, "", err
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}
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if err := f.Close(); err != nil {
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return nil, "", err
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}
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if err := r.Close(); err != nil {
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return nil, "", err
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}
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tar, err := archive.Tar(tmpDir, archive.Uncompressed)
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if err != nil {
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return nil, "", err
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}
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return ioutils.NewReadCloserWrapper(tar, func() error {
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err := tar.Close()
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os.RemoveAll(tmpDir)
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return err
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}), DefaultDockerfileName, nil
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}
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// GetContextFromGitURL uses a Git URL as context for a `docker build`. The
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// git repo is cloned into a temporary directory used as the context directory.
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// Returns the absolute path to the temporary context directory, the relative
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// path of the dockerfile in that context directory, and a non-nil error on
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// success.
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func GetContextFromGitURL(gitURL, dockerfileName string) (absContextDir, relDockerfile string, err error) {
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if _, err := exec.LookPath("git"); err != nil {
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return "", "", fmt.Errorf("unable to find 'git': %v", err)
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}
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if absContextDir, err = gitutils.Clone(gitURL); err != nil {
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return "", "", fmt.Errorf("unable to 'git clone' to temporary context directory: %v", err)
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}
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return getDockerfileRelPath(absContextDir, dockerfileName)
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}
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// GetContextFromURL uses a remote URL as context for a `docker build`. The
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// remote resource is downloaded as either a Dockerfile or a tar archive.
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// Returns the tar archive used for the context and a path of the
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// dockerfile inside the tar.
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func GetContextFromURL(out io.Writer, remoteURL, dockerfileName string) (io.ReadCloser, string, error) {
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response, err := httputils.Download(remoteURL)
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if err != nil {
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return nil, "", fmt.Errorf("unable to download remote context %s: %v", remoteURL, err)
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}
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progressOutput := streamformatter.NewStreamFormatter().NewProgressOutput(out, true)
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// Pass the response body through a progress reader.
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progReader := progress.NewProgressReader(response.Body, progressOutput, response.ContentLength, "", fmt.Sprintf("Downloading build context from remote url: %s", remoteURL))
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return GetContextFromReader(ioutils.NewReadCloserWrapper(progReader, func() error { return response.Body.Close() }), dockerfileName)
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}
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// GetContextFromLocalDir uses the given local directory as context for a
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// `docker build`. Returns the absolute path to the local context directory,
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// the relative path of the dockerfile in that context directory, and a non-nil
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// error on success.
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func GetContextFromLocalDir(localDir, dockerfileName string) (absContextDir, relDockerfile string, err error) {
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// When using a local context directory, when the Dockerfile is specified
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// with the `-f/--file` option then it is considered relative to the
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// current directory and not the context directory.
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if dockerfileName != "" {
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if dockerfileName, err = filepath.Abs(dockerfileName); err != nil {
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return "", "", fmt.Errorf("unable to get absolute path to Dockerfile: %v", err)
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}
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}
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return getDockerfileRelPath(localDir, dockerfileName)
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}
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// getDockerfileRelPath uses the given context directory for a `docker build`
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// and returns the absolute path to the context directory, the relative path of
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// the dockerfile in that context directory, and a non-nil error on success.
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func getDockerfileRelPath(givenContextDir, givenDockerfile string) (absContextDir, relDockerfile string, err error) {
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if absContextDir, err = filepath.Abs(givenContextDir); err != nil {
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return "", "", fmt.Errorf("unable to get absolute context directory: %v", err)
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}
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// The context dir might be a symbolic link, so follow it to the actual
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// target directory.
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//
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// FIXME. We use isUNC (always false on non-Windows platforms) to workaround
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// an issue in golang. On Windows, EvalSymLinks does not work on UNC file
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// paths (those starting with \\). This hack means that when using links
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// on UNC paths, they will not be followed.
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if !isUNC(absContextDir) {
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absContextDir, err = filepath.EvalSymlinks(absContextDir)
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if err != nil {
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return "", "", fmt.Errorf("unable to evaluate symlinks in context path: %v", err)
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}
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}
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stat, err := os.Lstat(absContextDir)
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if err != nil {
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return "", "", fmt.Errorf("unable to stat context directory %q: %v", absContextDir, err)
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}
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|
||||
if !stat.IsDir() {
|
||||
return "", "", fmt.Errorf("context must be a directory: %s", absContextDir)
|
||||
}
|
||||
|
||||
absDockerfile := givenDockerfile
|
||||
if absDockerfile == "" {
|
||||
// No -f/--file was specified so use the default relative to the
|
||||
// context directory.
|
||||
absDockerfile = filepath.Join(absContextDir, DefaultDockerfileName)
|
||||
|
||||
// Just to be nice ;-) look for 'dockerfile' too but only
|
||||
// use it if we found it, otherwise ignore this check
|
||||
if _, err = os.Lstat(absDockerfile); os.IsNotExist(err) {
|
||||
altPath := filepath.Join(absContextDir, strings.ToLower(DefaultDockerfileName))
|
||||
if _, err = os.Lstat(altPath); err == nil {
|
||||
absDockerfile = altPath
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// If not already an absolute path, the Dockerfile path should be joined to
|
||||
// the base directory.
|
||||
if !filepath.IsAbs(absDockerfile) {
|
||||
absDockerfile = filepath.Join(absContextDir, absDockerfile)
|
||||
}
|
||||
|
||||
// Evaluate symlinks in the path to the Dockerfile too.
|
||||
//
|
||||
// FIXME. We use isUNC (always false on non-Windows platforms) to workaround
|
||||
// an issue in golang. On Windows, EvalSymLinks does not work on UNC file
|
||||
// paths (those starting with \\). This hack means that when using links
|
||||
// on UNC paths, they will not be followed.
|
||||
if !isUNC(absDockerfile) {
|
||||
absDockerfile, err = filepath.EvalSymlinks(absDockerfile)
|
||||
if err != nil {
|
||||
return "", "", fmt.Errorf("unable to evaluate symlinks in Dockerfile path: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
if _, err := os.Lstat(absDockerfile); err != nil {
|
||||
if os.IsNotExist(err) {
|
||||
return "", "", fmt.Errorf("Cannot locate Dockerfile: %q", absDockerfile)
|
||||
}
|
||||
return "", "", fmt.Errorf("unable to stat Dockerfile: %v", err)
|
||||
}
|
||||
|
||||
if relDockerfile, err = filepath.Rel(absContextDir, absDockerfile); err != nil {
|
||||
return "", "", fmt.Errorf("unable to get relative Dockerfile path: %v", err)
|
||||
}
|
||||
|
||||
if strings.HasPrefix(relDockerfile, ".."+string(filepath.Separator)) {
|
||||
return "", "", fmt.Errorf("The Dockerfile (%s) must be within the build context (%s)", givenDockerfile, givenContextDir)
|
||||
}
|
||||
|
||||
return absContextDir, relDockerfile, nil
|
||||
}
|
||||
|
||||
// isUNC returns true if the path is UNC (one starting \\). It always returns
|
||||
// false on Linux.
|
||||
func isUNC(path string) bool {
|
||||
return runtime.GOOS == "windows" && strings.HasPrefix(path, `\\`)
|
||||
}
|
||||
|
|
|
|||
|
|
@ -19,7 +19,6 @@ import (
|
|||
"time"
|
||||
|
||||
"github.com/Sirupsen/logrus"
|
||||
"github.com/docker/docker/api"
|
||||
"github.com/docker/docker/builder"
|
||||
"github.com/docker/docker/builder/dockerfile/parser"
|
||||
"github.com/docker/docker/pkg/archive"
|
||||
|
|
@ -604,7 +603,7 @@ func (b *Builder) readDockerfile() error {
|
|||
// that then look for 'dockerfile'. If neither are found then default
|
||||
// back to 'Dockerfile' and use that in the error message.
|
||||
if b.options.Dockerfile == "" {
|
||||
b.options.Dockerfile = api.DefaultDockerfileName
|
||||
b.options.Dockerfile = builder.DefaultDockerfileName
|
||||
if _, _, err := b.context.Stat(b.options.Dockerfile); os.IsNotExist(err) {
|
||||
lowercase := strings.ToLower(b.options.Dockerfile)
|
||||
if _, _, err := b.context.Stat(lowercase); err == nil {
|
||||
|
|
|
|||
|
|
@ -8,7 +8,6 @@ import (
|
|||
"io/ioutil"
|
||||
"regexp"
|
||||
|
||||
"github.com/docker/docker/api"
|
||||
"github.com/docker/docker/pkg/archive"
|
||||
"github.com/docker/docker/pkg/httputils"
|
||||
"github.com/docker/docker/pkg/urlutil"
|
||||
|
|
@ -87,7 +86,7 @@ func DetectContextFromRemoteURL(r io.ReadCloser, remoteURL string, createProgres
|
|||
|
||||
// dockerfileName is set to signal that the remote was interpreted as a single Dockerfile, in which case the caller
|
||||
// should use dockerfileName as the new name for the Dockerfile, irrespective of any other user input.
|
||||
dockerfileName = api.DefaultDockerfileName
|
||||
dockerfileName = DefaultDockerfileName
|
||||
|
||||
// TODO: return a context without tarsum
|
||||
return archive.Generate(dockerfileName, string(dockerfile))
|
||||
|
|
|
|||
Loading…
Reference in a new issue