podman-remote build should handle -f option properly

podman-remote build has to handle multiple different locations
for the Containerfile.  Currently this works in local mode but not
when using podman-remote.

Fixes: https://github.com/containers/podman/issues/9871

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

pkg/api/handlers/compat/images_build.go

@@ -139,6 +139,31 @@ func BuildImage(w http.ResponseWriter, r *http.Request) {
 		addCaps = m
 	}
 
+	// convert addcaps formats
+	containerFiles := []string{}
+	if _, found := r.URL.Query()["dockerfile"]; found {
+		var m = []string{}
+		if err := json.Unmarshal([]byte(query.Dockerfile), &m); err != nil {
+			utils.BadRequest(w, "dockerfile", query.Dockerfile, err)
+			return
+		}
+		containerFiles = m
+	} else {
+		containerFiles = []string{"Dockerfile"}
+		if utils.IsLibpodRequest(r) {
+			containerFiles = []string{"Containerfile"}
+			if _, err = os.Stat(filepath.Join(contextDirectory, "Containerfile")); err != nil {
+				if _, err1 := os.Stat(filepath.Join(contextDirectory, "Dockerfile")); err1 == nil {
+					containerFiles = []string{"Dockerfile"}
+				} else {
+					utils.BadRequest(w, "dockerfile", query.Dockerfile, err)
+				}
+			}
+		} else {
+			containerFiles = []string{"Dockerfile"}
+		}
+	}
+
 	addhosts := []string{}
 	if _, found := r.URL.Query()["extrahosts"]; found {
 		if err := json.Unmarshal([]byte(query.AddHosts), &addhosts); err != nil {
@@ -470,7 +495,7 @@ func BuildImage(w http.ResponseWriter, r *http.Request) {
 	runCtx, cancel := context.WithCancel(context.Background())
 	go func() {
 		defer cancel()
-		imageID, _, err = runtime.Build(r.Context(), buildOptions, query.Dockerfile)
+		imageID, _, err = runtime.Build(r.Context(), buildOptions, containerFiles...)
 		if err == nil {
 			success = true
 		} else {

pkg/bindings/images/build.go

@@ -282,10 +282,6 @@ func Build(ctx context.Context, containerFiles []string, options entities.BuildO
 		stdout = options.Out
 	}
 
-	entries := make([]string, len(containerFiles))
-	copy(entries, containerFiles)
-	entries = append(entries, options.ContextDirectory)
-
 	excludes := options.Excludes
 	if len(excludes) == 0 {
 		excludes, err = parseDockerignore(options.ContextDirectory)
@@ -294,9 +290,50 @@ func Build(ctx context.Context, containerFiles []string, options entities.BuildO
 		}
 	}
 
-	tarfile, err := nTar(excludes, entries...)
+	contextDir, err := filepath.Abs(options.ContextDirectory)
 	if err != nil {
-		logrus.Errorf("cannot tar container entries %v error: %v", entries, err)
+		logrus.Errorf("cannot find absolute path of %v: %v", options.ContextDirectory, err)
+		return nil, err
+	}
+
+	tarContent := []string{options.ContextDirectory}
+	newContainerFiles := []string{}
+	for _, c := range containerFiles {
+		containerfile, err := filepath.Abs(c)
+		if err != nil {
+			logrus.Errorf("cannot find absolute path of %v: %v", c, err)
+			return nil, err
+		}
+
+		// Check if Containerfile is in the context directory, if so truncate the contextdirectory off path
+		// Do NOT add to tarfile
+		if strings.HasPrefix(containerfile, contextDir+string(filepath.Separator)) {
+			containerfile = strings.TrimPrefix(containerfile, contextDir+string(filepath.Separator))
+		} else {
+			// If Containerfile does not exists assume it is in context directory, do Not add to tarfile
+			if _, err := os.Lstat(containerfile); err != nil {
+				if !os.IsNotExist(err) {
+					return nil, err
+				}
+				containerfile = c
+			} else {
+				// If Containerfile does exists but is not in context directory add it to the tarfile
+				tarContent = append(tarContent, containerfile)
+			}
+		}
+		newContainerFiles = append(newContainerFiles, containerfile)
+	}
+	if len(newContainerFiles) > 0 {
+		cFileJSON, err := json.Marshal(newContainerFiles)
+		if err != nil {
+			return nil, err
+		}
+		params.Set("dockerfile", string(cFileJSON))
+	}
+
+	tarfile, err := nTar(excludes, tarContent...)
+	if err != nil {
+		logrus.Errorf("cannot tar container entries %v error: %v", tarContent, err)
 		return nil, err
 	}
 	defer func() {
@@ -305,23 +342,6 @@ func Build(ctx context.Context, containerFiles []string, options entities.BuildO
 		}
 	}()
 
-	containerFile, err := filepath.Abs(entries[0])
-	if err != nil {
-		logrus.Errorf("cannot find absolute path of %v: %v", entries[0], err)
-		return nil, err
-	}
-	contextDir, err := filepath.Abs(entries[1])
-	if err != nil {
-		logrus.Errorf("cannot find absolute path of %v: %v", entries[1], err)
-		return nil, err
-	}
-
-	if strings.HasPrefix(containerFile, contextDir+string(filepath.Separator)) {
-		containerFile = strings.TrimPrefix(containerFile, contextDir+string(filepath.Separator))
-	}
-
-	params.Set("dockerfile", containerFile)
-
 	conn, err := bindings.GetClient(ctx)
 	if err != nil {
 		return nil, err

test/system/070-build.bats

@@ -794,6 +794,32 @@ EOF
     run_podman rmi -f build_test
 }
 
+@test "podman build -f test " {
+    tmpdir=$PODMAN_TMPDIR/build-test
+    subdir=$tmpdir/subdir
+    mkdir -p $subdir
+
+    containerfile1=$tmpdir/Containerfile1
+    cat >$containerfile1 <<EOF
+FROM scratch
+copy . /tmp
+EOF
+    containerfile2=$PODMAN_TMPDIR/Containerfile2
+    cat >$containerfile2 <<EOF
+FROM $IMAGE
+EOF
+    run_podman build -t build_test -f Containerfile1 $tmpdir
+    run_podman 125 build -t build_test -f Containerfile2 $tmpdir
+    is "$output" ".*Containerfile2: no such file or directory" "Containerfile2 should not exist"
+    run_podman build -t build_test -f $containerfile1 $tmpdir
+    run_podman build -t build_test -f $containerfile2 $tmpdir
+    run_podman build -t build_test -f $containerfile1
+    run_podman build -t build_test -f $containerfile2
+    run_podman build -t build_test -f $containerfile1 -f $containerfile2 $tmpdir
+    is "$output" ".*$IMAGE" "Containerfile2 is also passed to server"
+    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