git: support all git transports

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

client/llb/source.go

@@ -141,7 +141,19 @@ type ImageInfo struct {
 }
 
 func Git(remote, ref string, opts ...GitOption) State {
+	url := ""
+
+	for _, prefix := range []string{
+		"http://", "https://", "git://", "git@",
+	} {
+		if strings.HasPrefix(remote, prefix) {
+			url = strings.Split(remote, "#")[0]
+			remote = strings.TrimPrefix(remote, prefix)
+		}
+	}
+
 	id := remote
+
 	if ref != "" {
 		id += "#" + ref
 	}
@@ -154,6 +166,9 @@ func Git(remote, ref string, opts ...GitOption) State {
 	if gi.KeepGitDir {
 		attrs[pb.AttrKeepGitDir] = "true"
 	}
+	if url != "" {
+		attrs[pb.AttrFullRemoteURL] = url
+	}
 	source := NewSource("git://"+id, attrs, gi.Metadata())
 	return NewState(source.Output())
 }

frontend/dockerfile/builder/build.go

@@ -26,11 +26,11 @@ const (
 	dockerignoreFilename  = ".dockerignore"
 	buildArgPrefix        = "build-arg:"
 	labelPrefix           = "label:"
-	gitPrefix             = "git://"
 	keyNoCache            = "no-cache"
 )
 
 var httpPrefix = regexp.MustCompile("^https?://")
+var gitUrlPathWithFragmentSuffix = regexp.MustCompile(".git(?:#.+)?$")
 
 func Build(ctx context.Context, c client.Client) error {
 	opts := c.Opts()
@@ -55,12 +55,10 @@ func Build(ctx context.Context, c client.Client) error {
 		llb.SharedKeyHint(defaultDockerfileName),
 	)
 	var buildContext *llb.State
-	if strings.HasPrefix(opts[LocalNameContext], gitPrefix) {
-		src = parseGitSource(opts[LocalNameContext])
+	if st, ok := detectGitContext(opts[LocalNameContext]); ok {
+		src = *st
 		buildContext = &src
-	}
-
-	if httpPrefix.MatchString(opts[LocalNameContext]) {
+	} else if httpPrefix.MatchString(opts[LocalNameContext]) {
 		unpack := llb.Image(dockerfile2llb.CopyImage).Run(llb.Shlex("copy --unpack /src/context /out/"), llb.ReadonlyRootFS())
 		unpack.AddMount("/src", llb.HTTP(opts[LocalNameContext], llb.Filename("context")), llb.Readonly)
 		src = unpack.AddMount("/out", llb.Scratch())
@@ -196,12 +194,27 @@ func filter(opt map[string]string, key string) map[string]string {
 	return m
 }
 
-func parseGitSource(ref string) llb.State {
-	ref = strings.TrimPrefix(ref, gitPrefix)
+func detectGitContext(ref string) (*llb.State, bool) {
+	found := false
+	if httpPrefix.MatchString(ref) && gitUrlPathWithFragmentSuffix.MatchString(ref) {
+		found = true
+	}
+
+	for _, prefix := range []string{"git://", "github.com/", "git@"} {
+		if strings.HasPrefix(ref, prefix) {
+			found = true
+			break
+		}
+	}
+	if !found {
+		return nil, false
+	}
+
 	parts := strings.SplitN(ref, "#", 2)
 	branch := ""
 	if len(parts) > 1 {
 		branch = parts[1]
 	}
-	return llb.Git(parts[0], branch)
+	st := llb.Git(parts[0], branch)
+	return &st, true
 }

frontend/dockerfile/dockerfile_test.go

@@ -1387,7 +1387,7 @@ COPY --from=build foo bar2
 	)
 	require.NoError(t, err)
 
-	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join(gitDir, ".git"))))
+	server := httptest.NewServer(http.FileServer(http.Dir(filepath.Join(gitDir))))
 	defer server.Close()
 
 	destDir, err := ioutil.TempDir("", "buildkit")
@@ -1401,7 +1401,7 @@ COPY --from=build foo bar2
 	_, err = c.Solve(context.TODO(), nil, client.SolveOpt{
 		Frontend: "dockerfile.v0",
 		FrontendAttrs: map[string]string{
-			"context": "git://" + server.URL + "/#first",
+			"context": server.URL + "/.git#first",
 		},
 		Exporter:          client.ExporterLocal,
 		ExporterOutputDir: destDir,
@@ -1424,7 +1424,7 @@ COPY --from=build foo bar2
 	_, err = c.Solve(context.TODO(), nil, client.SolveOpt{
 		Frontend: "dockerfile.v0",
 		FrontendAttrs: map[string]string{
-			"context": "git://" + server.URL + "/",
+			"context": server.URL + "/.git",
 		},
 		Exporter:          client.ExporterLocal,
 		ExporterOutputDir: destDir,

solver/pb/attr.go

@@ -1,6 +1,7 @@
 package pb
 
 const AttrKeepGitDir = "git.keepgitdir"
+const AttrFullRemoteURL = "git.fullurl"
 const AttrLocalSessionID = "local.session"
 const AttrIncludePatterns = "local.includepattern"
 const AttrExcludePatterns = "local.excludepatterns"

source/identifier.go

@@ -62,6 +62,8 @@ func FromLLB(op *pb.Op_Source) (Identifier, error) {
 				if v == "true" {
 					id.KeepGitDir = true
 				}
+			case pb.AttrFullRemoteURL:
+				id.Remote = v
 			}
 		}
 	}