Vendor in latest containers/buildah

Switch from projectatomic/buildah to containers/buildah

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

vendor/github.com/containers/buildah/imagebuildah/util.go

@@ -0,0 +1,113 @@
+package imagebuildah
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"os/exec"
+	"path"
+	"path/filepath"
+	"strings"
+
+	"github.com/containers/buildah"
+	"github.com/containers/storage/pkg/chrootarchive"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+)
+
+func cloneToDirectory(url, dir string) error {
+	if !strings.HasPrefix(url, "git://") {
+		url = "git://" + url
+	}
+	logrus.Debugf("cloning %q to %q", url, dir)
+	cmd := exec.Command("git", "clone", url, dir)
+	return cmd.Run()
+}
+
+func downloadToDirectory(url, dir string) error {
+	logrus.Debugf("extracting %q to %q", url, dir)
+	resp, err := http.Get(url)
+	if err != nil {
+		return errors.Wrapf(err, "error getting %q", url)
+	}
+	defer resp.Body.Close()
+	if resp.ContentLength == 0 {
+		return errors.Errorf("no contents in %q", url)
+	}
+	if err := chrootarchive.Untar(resp.Body, dir, nil); err != nil {
+		resp1, err := http.Get(url)
+		if err != nil {
+			return errors.Wrapf(err, "error getting %q", url)
+		}
+		defer resp1.Body.Close()
+		body, err := ioutil.ReadAll(resp1.Body)
+		if err != nil {
+			return errors.Wrapf(err, "Failed to read %q", url)
+		}
+		dockerfile := filepath.Join(dir, "Dockerfile")
+		// Assume this is a Dockerfile
+		if err := ioutil.WriteFile(dockerfile, body, 0600); err != nil {
+			return errors.Wrapf(err, "Failed to write %q to %q", url, dockerfile)
+		}
+	}
+	return nil
+}
+
+// TempDirForURL checks if the passed-in string looks like a URL.  If it is,
+// TempDirForURL creates a temporary directory, arranges for its contents to be
+// the contents of that URL, and returns the temporary directory's path, along
+// with the name of a subdirectory which should be used as the build context
+// (which may be empty or ".").  Removal of the temporary directory is the
+// responsibility of the caller.  If the string doesn't look like a URL,
+// TempDirForURL returns empty strings and a nil error code.
+func TempDirForURL(dir, prefix, url string) (name string, subdir string, err error) {
+	if !strings.HasPrefix(url, "http://") &&
+		!strings.HasPrefix(url, "https://") &&
+		!strings.HasPrefix(url, "git://") &&
+		!strings.HasPrefix(url, "github.com/") {
+		return "", "", nil
+	}
+	name, err = ioutil.TempDir(dir, prefix)
+	if err != nil {
+		return "", "", errors.Wrapf(err, "error creating temporary directory for %q", url)
+	}
+	if strings.HasPrefix(url, "git://") {
+		err = cloneToDirectory(url, name)
+		if err != nil {
+			if err2 := os.Remove(name); err2 != nil {
+				logrus.Debugf("error removing temporary directory %q: %v", name, err2)
+			}
+			return "", "", err
+		}
+		return name, "", nil
+	}
+	if strings.HasPrefix(url, "github.com/") {
+		ghurl := url
+		url = fmt.Sprintf("https://%s/archive/master.tar.gz", ghurl)
+		logrus.Debugf("resolving url %q to %q", ghurl, url)
+		subdir = path.Base(ghurl) + "-master"
+	}
+	if strings.HasPrefix(url, "http://") || strings.HasPrefix(url, "https://") {
+		err = downloadToDirectory(url, name)
+		if err != nil {
+			if err2 := os.Remove(name); err2 != nil {
+				logrus.Debugf("error removing temporary directory %q: %v", name, err2)
+			}
+			return "", subdir, err
+		}
+		return name, subdir, nil
+	}
+	logrus.Debugf("don't know how to retrieve %q", url)
+	if err2 := os.Remove(name); err2 != nil {
+		logrus.Debugf("error removing temporary directory %q: %v", name, err2)
+	}
+	return "", "", errors.Errorf("unreachable code reached")
+}
+
+// InitReexec is a wrapper for buildah.InitReexec().  It should be called at
+// the start of main(), and if it returns true, main() should return
+// immediately.
+func InitReexec() bool {
+	return buildah.InitReexec()
+}