Add support for podman remote build -f - .

Fixes: https://github.com/containers/podman/issues/10621

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

pkg/bindings/images/build.go

@@ -299,6 +299,22 @@ func Build(ctx context.Context, containerFiles []string, options entities.BuildO
 	tarContent := []string{options.ContextDirectory}
 	newContainerFiles := []string{}
 	for _, c := range containerFiles {
+		if c == "/dev/stdin" {
+			content, err := ioutil.ReadAll(os.Stdin)
+			if err != nil {
+				return nil, err
+			}
+			tmpFile, err := ioutil.TempFile("", "build")
+			if err != nil {
+				return nil, err
+			}
+			defer os.Remove(tmpFile.Name()) // clean up
+			defer tmpFile.Close()
+			if _, err := tmpFile.Write(content); err != nil {
+				return nil, err
+			}
+			c = tmpFile.Name()
+		}
 		containerfile, err := filepath.Abs(c)
 		if err != nil {
 			logrus.Errorf("cannot find absolute path of %v: %v", c, err)

test/system/070-build.bats

@@ -29,6 +29,29 @@ EOF
     run_podman rmi -f build_test
 }
 
+@test "podman build test -f -" {
+    rand_filename=$(random_string 20)
+    rand_content=$(random_string 50)
+
+    tmpdir=$PODMAN_TMPDIR/build-test
+    mkdir -p $tmpdir
+    containerfile=$PODMAN_TMPDIR/Containerfile
+    cat >$containerfile <<EOF
+FROM $IMAGE
+RUN apk add nginx
+RUN echo $rand_content > /$rand_filename
+EOF
+
+    # The 'apk' command can take a long time to fetch files; bump timeout
+    PODMAN_TIMEOUT=240 run_podman build -t build_test -f - --format=docker $tmpdir < $containerfile
+    is "$output" ".*STEP 4: COMMIT" "COMMIT seen in log"
+
+    run_podman run --rm build_test cat /$rand_filename
+    is "$output"   "$rand_content"   "reading generated file in image"
+
+    run_podman rmi -f build_test
+}
+
 @test "podman build - global runtime flags test" {
     skip_if_remote "--runtime-flag flag not supported for remote"