Refactored binapi generator with message encoding

[govpp.git] / cmd / binapi-generator / util.go

diff --git a/cmd/binapi-generator/util.go b/cmd/binapi-generator/util.go
new file mode 100644 (file)
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))
+}