1 files changed, 81 insertions, 0 deletions
diff --git a/cmd/binapi-generator/util.go b/cmd/binapi-generator/util.go
new file mode 100644
index 0000000..8738963
--- /dev/null
+++ b/cmd/binapi-generator/util.go
@@ -0,0 +1,81 @@
+//  Copyright (c) 2020 Cisco and/or its affiliates.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at:
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+
+package main
+
+import (
+	"io/ioutil"
+	"os/exec"
+	"path"
+	"strings"
+
+	"github.com/sirupsen/logrus"
+)
+
+const (
+	versionScriptPath = "./src/scripts/version"
+	defaultVppApiDir  = "/usr/share/vpp/api"
+)
+
+func ResolveVppVersion(inputDir string) string {
+	// assuming VPP package is installed
+	if inputDir == defaultVppApiDir {
+		// resolve VPP version using dpkg
+		cmd := exec.Command("dpkg-query", "-f", "${Version}", "-W", "vpp")
+		out, err := cmd.CombinedOutput()
+		if err != nil {
+			logrus.Warnf("resolving VPP version from installed package failed: %v", err)
+			logrus.Warnf("command output: %s", out)
+		} else {
+			version := strings.TrimSpace(string(out))
+			logrus.Debugf("resolved VPP version from installed package: %v", version)
+			return version
+		}
+	}
+	// check if inside VPP git repo
+	if inputDir != "" {
+		repo := findVppGitRepo(inputDir)
+		if repo != "" {
+			cmd := exec.Command(versionScriptPath)
+			cmd.Dir = repo
+			out, err := cmd.CombinedOutput()
+			if err != nil {
+				logrus.Warnf("resolving VPP version from version script failed: %v", err)
+				logrus.Warnf("command output: %s", out)
+			} else {
+				version := strings.TrimSpace(string(out))
+				logrus.Debugf("resolved VPP version from version script: %v", version)
+				return version
+			}
+		}
+		file, err := ioutil.ReadFile(path.Join(inputDir, "VPP_VERSION"))
+		if err == nil {
+			return strings.TrimSpace(string(file))
+		}
+	}
+	logrus.Warnf("VPP version could not be resolved, you can set it manually using VPP_API_VERSION env var")
+	return "unknown"
+}
+
+func findVppGitRepo(dir string) string {
+	cmd := exec.Command("git", "rev-parse", "--show-toplevel")
+	cmd.Dir = dir
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		logrus.Warnf("checking VPP git repo failed: %v", err)
+		logrus.Warnf("command output: %s", out)
+		return ""
+	}
+	return strings.TrimSpace(string(out))
+}