Add --version flag

Signed-off-by: Aylei <[email protected]>

Author: aylei

Makefile

@@ -1,5 +1,6 @@
 .PHONY: build plugin agent check
 
+LDFLAGS = $(shell ./version.sh)
 GOENV  := GO15VENDOREXPERIMENT="1" GO111MODULE=on CGO_ENABLED=0 GOOS=linux GOARCH=amd64
 GO := $(GOENV) go
 
@@ -8,13 +9,13 @@ default: build
 build: plugin agent-docker
 
 plugin:
-	GO111MODULE=on CGO_ENABLED=0 go build -o kubectl-debug cmd/plugin/main.go
+	GO111MODULE=on CGO_ENABLED=0 go build -ldflags '$(LDFLAGS)' -o kubectl-debug cmd/plugin/main.go
 
 agent-docker: agent
 	docker build . -t aylei/debug-agent:latest
 
 agent:
-	$(GO) build -o debug-agent cmd/agent/main.go
+	$(GO) build -ldflags '$(LDFLAGS)' -o debug-agent cmd/agent/main.go
 
 check:
 	find . -iname '*.go' -type f | grep -v /vendor/ | xargs gofmt -l

pkg/plugin/cmd.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"github.com/aylei/kubectl-debug/version"
 	"io"
 	"net/http"
 	"net/url"
@@ -51,6 +52,9 @@ const (
 
 	# override the debug config file
 	kubectl debug POD_NAME --debug-config ./debug-config.yml
+
+	# check version
+	kubectl --version
 `
 	longDesc = `
 Run a container in a running pod, this container will join the namespaces of an existing container of the pod.
@@ -137,6 +141,7 @@ func NewDebugCmd(streams genericclioptions.IOStreams) *cobra.Command {
 		Short:                 "Run a container in a running pod",
 		Long:                  longDesc,
 		Example:               example,
+		Version:               version.Version(),
 		Run: func(c *cobra.Command, args []string) {
 			argsLenAtDash := c.ArgsLenAtDash()
 			cmdutil.CheckErr(opts.Complete(c, args, argsLenAtDash))

version.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ -n ${GIT_COMMIT-} ]] || GIT_COMMIT=$(git rev-parse "HEAD^{commit}" 2>/dev/null); then
+  if [[ -z ${GIT_TREE_STATE-} ]]; then
+    # Check if the tree is dirty.  default to dirty
+    if git_status=$(git status --porcelain 2>/dev/null) && [[ -z ${git_status} ]]; then
+      GIT_TREE_STATE="clean"
+    else
+      GIT_TREE_STATE="dirty"
+    fi
+  fi
+
+  # Use git describe to find the version based on tags.
+  if [[ -n ${GIT_VERSION-} ]] || GIT_VERSION=$(git describe --tags --abbrev=14 "${GIT_COMMIT}^{commit}" 2>/dev/null); then
+    # This translates the "git describe" to an actual semver.org
+    # compatible semantic version that looks something like this:
+    #   v1.0.0-beta.0.10+4c183422345d8f
+    #
+    # downstream consumers are expecting it there.
+    DASHES_IN_VERSION=$(echo "${GIT_VERSION}" | sed "s/[^-]//g")
+    if [[ "${DASHES_IN_VERSION}" == "---" ]] ; then
+      # We have distance to subversion (v1.1.0-subversion-1-gCommitHash)
+      GIT_VERSION=$(echo "${GIT_VERSION}" | sed "s/-\([0-9]\{1,\}\)-g\([0-9a-f]\{14\}\)$/.\1\+\2/")
+    elif [[ "${DASHES_IN_VERSION}" == "--" ]] ; then
+      # We have distance to base tag (v1.1.0-1-gCommitHash)
+      GIT_VERSION=$(echo "${GIT_VERSION}" | sed "s/-g\([0-9a-f]\{14\}\)$/+\1/")
+    fi
+    if [[ "${GIT_TREE_STATE}" == "dirty" ]]; then
+      # git describe --dirty only considers changes to existing files, but
+      # that is problematic since new untracked .go files affect the build,
+      # so use our idea of "dirty" from git status instead.
+      GIT_VERSION+="-dirty"
+    fi
+
+
+    # If GIT_VERSION is not a valid Semantic Version, then refuse to build.
+    if ! [[ "${GIT_VERSION}" =~ ^v([0-9]+)\.([0-9]+)(\.[0-9]+)?(-[0-9A-Za-z.-]+)?(\+[0-9A-Za-z.-]+)?$ ]]; then
+      echo "GIT_VERSION should be a valid Semantic Version. Current value: ${GIT_VERSION}"
+      echo "Please see more details here: https://semver.org"
+      exit 1
+    fi
+  fi
+fi
+
+echo "-X 'github.com/aylei/kubectl-debug/version.gitVersion=${GIT_VERSION}'"

version/version.go

@@ -0,0 +1,9 @@
+package version
+
+var (
+	gitVersion   = "v0.0.0-master+$Format:%h$"
+)
+
+func Version() string {
+	return gitVersion
+}