build: fixup resolvePaths for remote context path

Signed-off-by: Justin Chadwell <me@jedevc.com>

commands/build.go

@@ -670,9 +670,11 @@ func dockerUlimitToControllerUlimit(u *dockeropts.UlimitOpt) *controllerapi.Ulim
 // and replaces them to absolute paths.
 func resolvePaths(options *controllerapi.BuildOptions) (_ *controllerapi.BuildOptions, err error) {
 	if options.ContextPath != "" && options.ContextPath != "-" {
-		options.ContextPath, err = filepath.Abs(options.ContextPath)
+		if !urlutil.IsGitURL(options.ContextPath) && !urlutil.IsURL(options.ContextPath) {
-		if err != nil {
+			options.ContextPath, err = filepath.Abs(options.ContextPath)
-			return nil, err
+			if err != nil {
+				return nil, err
+			}
 		}
 	}
 	if options.DockerfileName != "" && options.DockerfileName != "-" {

commands/build_test.go

@@ -35,6 +35,11 @@ func TestResolvePaths(t *testing.T) {
 			options: controllerapi.BuildOptions{ContextPath: "-"},
 			want:    controllerapi.BuildOptions{ContextPath: "-"},
 		},
+		{
+			name:    "contextpath-ssh",
+			options: controllerapi.BuildOptions{ContextPath: "git@github.com:docker/buildx.git"},
+			want:    controllerapi.BuildOptions{ContextPath: "git@github.com:docker/buildx.git"},
+		},
 		{
 			name:    "dockerfilename",
 			options: controllerapi.BuildOptions{DockerfileName: "test"},