update go-getter

Update to the latest go-getter to support unpacking github release
tarballs as modules.

vendor/github.com/hashicorp/go-getter/README.md

@@ -119,6 +119,37 @@ The protocol-specific options are documented below the URL format
 section. But because they are part of the URL, we point it out here so
 you know they exist.
 
+### Subdirectories
+
+If you want to download only a specific subdirectory from a downloaded
+directory, you can specify a subdirectory after a double-slash `//`.
+go-getter will first download the URL specified _before_ the double-slash
+(as if you didn't specify a double-slash), but will then copy the
+path after the double slash into the target directory.
+
+For example, if you're downloading this GitHub repository, but you only
+want to download the `test-fixtures` directory, you can do the following:
+
+```
+https://github.com/hashicorp/go-getter.git//test-fixtures
+```
+
+If you downloaded this to the `/tmp` directory, then the file
+`/tmp/archive.gz` would exist. Notice that this file is in the `test-fixtures`
+directory in this repository, but because we specified a subdirectory,
+go-getter automatically copied only that directory contents.
+
+Subdirectory paths may contain may also use filesystem glob patterns.
+The path must match _exactly one_ entry or go-getter will return an error.
+This is useful if you're not sure the exact directory name but it follows
+a predictable naming structure.
+
+For example, the following URL would also work:
+
+```
+https://github.com/hashicorp/go-getter.git//test-*
+```
+
 ### Checksumming
 
 For file downloads of any protocol, go-getter can automatically verify

vendor/github.com/hashicorp/go-getter/client.go

@@ -305,7 +305,13 @@ func (c *Client) Get() error {
 			return err
 		}
 
-		return copyDir(realDst, filepath.Join(dst, subDir), false)
+		// Process any globs
+		subDir, err := SubdirGlob(dst, subDir)
+		if err != nil {
+			return err
+		}
+
+		return copyDir(realDst, subDir, false)
 	}
 
 	return nil

vendor/github.com/hashicorp/go-getter/decompress_tar.go

@@ -27,6 +27,11 @@ func untar(input io.Reader, dst, src string, dir bool) error {
 			return err
 		}
 
+		if hdr.Typeflag == tar.TypeXGlobalHeader || hdr.Typeflag == tar.TypeXHeader {
+			// don't unpack extended headers as files
+			continue
+		}
+
 		path := dst
 		if dir {
 			path = filepath.Join(path, hdr.Name)
@@ -81,3 +86,27 @@ func untar(input io.Reader, dst, src string, dir bool) error {
 		}
 	}
 }
+
+// tarDecompressor is an implementation of Decompressor that can
+// unpack tar files.
+type tarDecompressor struct{}
+
+func (d *tarDecompressor) Decompress(dst, src string, dir bool) error {
+	// If we're going into a directory we should make that first
+	mkdir := dst
+	if !dir {
+		mkdir = filepath.Dir(dst)
+	}
+	if err := os.MkdirAll(mkdir, 0755); err != nil {
+		return err
+	}
+
+	// File first
+	f, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	return untar(f, dst, src, dir)
+}

vendor/github.com/hashicorp/go-getter/detect.go

@@ -72,12 +72,18 @@ func Detect(src string, pwd string, ds []Detector) (string, error) {
 				subDir = detectSubdir
 			}
 		}
+
 		if subDir != "" {
 			u, err := url.Parse(result)
 			if err != nil {
 				return "", fmt.Errorf("Error parsing URL: %s", err)
 			}
 			u.Path += "//" + subDir
+
+			// a subdir may contain wildcards, but in order to support them we
+			// have to ensure the path isn't escaped.
+			u.RawPath = u.Path
+
 			result = u.String()
 		}
 

vendor/github.com/hashicorp/go-getter/get_http.go

@@ -98,7 +98,6 @@ func (g *HttpGetter) Get(dst string, u *url.URL) error {
 }
 
 func (g *HttpGetter) GetFile(dst string, u *url.URL) error {
-
 	if g.Netrc {
 		// Add auth from netrc if we can
 		if err := addAuthFromNetrc(u); err != nil {
@@ -140,13 +139,22 @@ func (g *HttpGetter) getSubdir(dst, source, subDir string) error {
 	}
 	defer os.RemoveAll(td)
 
+	// We have to create a subdirectory that doesn't exist for the file
+	// getter to work.
+	td = filepath.Join(td, "data")
+
 	// Download that into the given directory
 	if err := Get(td, source); err != nil {
 		return err
 	}
 
+	// Process any globbing
+	sourcePath, err := SubdirGlob(td, subDir)
+	if err != nil {
+		return err
+	}
+
 	// Make sure the subdir path actually exists
-	sourcePath := filepath.Join(td, subDir)
 	if _, err := os.Stat(sourcePath); err != nil {
 		return fmt.Errorf(
 			"Error downloading %s: %s", source, err)

vendor/github.com/hashicorp/go-getter/source.go

@@ -1,6 +1,8 @@
 package getter
 
 import (
+	"fmt"
+	"path/filepath"
 	"strings"
 )
 
@@ -34,3 +36,22 @@ func SourceDirSubdir(src string) (string, string) {
 
 	return src, subdir
 }
+
+// SubdirGlob returns the actual subdir with globbing processed.
+//
+// dst should be a destination directory that is already populated (the
+// download is complete) and subDir should be the set subDir. If subDir
+// is an empty string, this returns an empty string.
+//
+// The returned path is the full absolute path.
+func SubdirGlob(dst, subDir string) (string, error) {
+	matches, err := filepath.Glob(filepath.Join(dst, subDir))
+	if err != nil {
+		return "", err
+	}
+	if len(matches) > 1 {
+		return "", fmt.Errorf("subdir %q matches multiple paths", subDir)
+	}
+
+	return matches[0], nil
+}

vendor/vendor.json

@@ -1353,10 +1353,10 @@
 			"revisionTime": "2017-02-11T01:34:15Z"
 		},
 		{
-			"checksumSHA1": "Glhu9BTy826XCLfMw7rexQ5mKeY=",
+			"checksumSHA1": "cw5fzHNCbc3zVjNRnP1pm5tt5rk=",
 			"path": "github.com/hashicorp/go-getter",
-			"revision": "6aae8e4e2dee8131187c6a54b52664796e5a02b0",
-			"revisionTime": "2017-07-13T01:23:01Z"
+			"revision": "ee320eed76420de7fa4395de568552c63fe9115e",
+			"revisionTime": "2017-09-05T20:45:58Z"
 		},
 		{
 			"checksumSHA1": "9J+kDr29yDrwsdu2ULzewmqGjpA=",