Fix building from http or '-' options

cmd/podman/images/build.go

@@ -138,36 +138,9 @@ func build(cmd *cobra.Command, args []string) error {
 		return errors.New("cannot specify --squash, --squash-all and --layers options together")
 	}
 
-	contextDir, containerFiles, err := extractContextAndFiles(args, buildOpts.File)
-	if err != nil {
-		return err
-	}
-
-	ie, err := registry.NewImageEngine(cmd, args)
-	if err != nil {
-		return err
-	}
-
-	apiBuildOpts, err := buildFlagsWrapperToOptions(cmd, contextDir, &buildOpts)
-	if err != nil {
-		return err
-	}
-
-	_, err = ie.Build(registry.GetContext(), containerFiles, *apiBuildOpts)
-	return err
-}
-
-// extractContextAndFiles parses args and files to extract a context directory
-// and {Container,Docker}files.
-//
-// TODO: this was copied and altered from the v1 client which in turn was
-// copied and altered from the Buildah code. Ideally, all of this code should
-// be cleanly consolidated into a package that is shared between Buildah and
-// Podman.
-func extractContextAndFiles(args, files []string) (string, []string, error) {
 	// Extract container files from the CLI (i.e., --file/-f) first.
 	var containerFiles []string
-	for _, f := range files {
+	for _, f := range buildOpts.File {
 		if f == "-" {
 			containerFiles = append(containerFiles, "/dev/stdin")
 		} else {
@@ -181,7 +154,7 @@ func extractContextAndFiles(args, files []string) (string, []string, error) {
 		// The context directory could be a URL.  Try to handle that.
 		tempDir, subDir, err := imagebuildah.TempDirForURL("", "buildah", args[0])
 		if err != nil {
-			return "", nil, errors.Wrapf(err, "error prepping temporary context directory")
+			return errors.Wrapf(err, "error prepping temporary context directory")
 		}
 		if tempDir != "" {
 			// We had to download it to a temporary directory.
@@ -196,7 +169,7 @@ func extractContextAndFiles(args, files []string) (string, []string, error) {
 			// Nope, it was local.  Use it as is.
 			absDir, err := filepath.Abs(args[0])
 			if err != nil {
-				return "", nil, errors.Wrapf(err, "error determining path to directory %q", args[0])
+				return errors.Wrapf(err, "error determining path to directory %q", args[0])
 			}
 			contextDir = absDir
 		}
@@ -212,18 +185,18 @@ func extractContextAndFiles(args, files []string) (string, []string, error) {
 			}
 			absFile, err := filepath.Abs(containerFiles[i])
 			if err != nil {
-				return "", nil, errors.Wrapf(err, "error determining path to file %q", containerFiles[i])
+				return errors.Wrapf(err, "error determining path to file %q", containerFiles[i])
 			}
 			contextDir = filepath.Dir(absFile)
 			break
 		}
 	}
 
 	if contextDir == "" {
-		return "", nil, errors.Errorf("no context directory and no Containerfile specified")
+		return errors.Errorf("no context directory and no Containerfile specified")
 	}
 	if !utils.IsDir(contextDir) {
-		return "", nil, errors.Errorf("context must be a directory: %q", contextDir)
+		return errors.Errorf("context must be a directory: %q", contextDir)
 	}
 	if len(containerFiles) == 0 {
 		if utils.FileExists(filepath.Join(contextDir, "Containerfile")) {
@@ -233,7 +206,18 @@ func extractContextAndFiles(args, files []string) (string, []string, error) {
 		}
 	}
 
-	return contextDir, containerFiles, nil
+	ie, err := registry.NewImageEngine(cmd, args)
+	if err != nil {
+		return err
+	}
+
+	apiBuildOpts, err := buildFlagsWrapperToOptions(cmd, contextDir, &buildOpts)
+	if err != nil {
+		return err
+	}
+
+	_, err = ie.Build(registry.GetContext(), containerFiles, *apiBuildOpts)
+	return err
 }
 
 // buildFlagsWrapperToOptions converts the local build flags to the build options used

test/system/070-build.bats

@@ -177,6 +177,27 @@ Labels.$label_name | $label_value
     run_podman rmi -f build_test
 }
 
+@test "podman build - stdin test" {
+    if is_remote && is_rootless; then
+        skip "unreliable with podman-remote and rootless; #2972"
+    fi
+
+    # Random workdir, and multiple random strings to verify command & env
+    workdir=/$(random_string 10)
+    PODMAN_TIMEOUT=240 run_podman build -t build_test - << EOF
+FROM  $IMAGE
+RUN mkdir $workdir
+WORKDIR $workdir
+RUN /bin/echo 'Test'
+EOF
+    is "$output" ".*STEP 5: COMMIT" "COMMIT seen in log"
+
+    run_podman run --rm build_test pwd
+    is "$output" "$workdir" "pwd command in container"
+
+    run_podman rmi -f build_test
+}
+
 function teardown() {
     # A timeout or other error in 'build' can leave behind stale images
     # that podman can't even see and which will cascade into subsequent