[mynewt-imgmod] 01/02: Use Makefile to embed version string

[ccollins]

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ccollins pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/mynewt-imgmod.git

commit 7a8a8a53755954bceb8b38637d1d612fa2ab1795
Author: Christopher Collins <ccoll...@apache.org>
AuthorDate: Thu Feb 20 09:59:32 2020 -0800

    Use Makefile to embed version string
    
    This allows us to include a git hash and build date in the
    `imgmod version` output.
---
 Makefile           | 31 +++++++++++++++++++++++++++++++
 imgmod.go          |  8 ++++----
 version/version.go | 13 +++++++++++++
 3 files changed, 48 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..dd94567
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,31 @@
+PKG := mynewt.apache.org/imgmod/version
+VERSION:="0.0.3"
+DATE := $(shell date -u +%F,%R)
+COMMIT := $(shell git rev-parse --short HEAD)
+ifneq ($(shell git status --porcelain),)
+    COMMIT_SUFFIX := "-dirty"
+endif
+GIT_STATE := ${COMMIT}${COMMIT_SUFFIX}
+
+GOOS?=linux
+GOARCH?=amd64
+
+GWARCH=${GOOS}-${GOARCH}
+
+all:
+       @echo "Usage:"
+       @echo "    make binary GOOS=linux   # Linux"
+       @echo "    make binary GOOS=darwin  # MacOS"
+       @echo "    make binary GOOS=windows # Windows"
+
+.PHONY: version
+version:
+       @echo ${VERSION}
+
+.PHONY: gitstate
+gitstate:
+       @echo ${GIT_STATE}
+
+binary:
+       @GOOS=${GOOS} GOARCH=${GOARCH} GO111MODULE=on go build -ldflags \
+               "-X ${PKG}.Version=${VERSION} -X ${PKG}.BuildDate=${DATE} -X 
${PKG}.GitState=${GIT_STATE}"
diff --git a/imgmod.go b/imgmod.go
index b3e2bb0..e4b9982 100644
--- a/imgmod.go
+++ b/imgmod.go
@@ -20,16 +20,16 @@
 package main
 
 import (
-       "github.com/apache/mynewt-artifact/errors"
        log "github.com/sirupsen/logrus"
        "github.com/spf13/cobra"
 
+       "github.com/apache/mynewt-artifact/errors"
+
        "mynewt.apache.org/imgmod/cli"
        "mynewt.apache.org/imgmod/iutil"
+       "mynewt.apache.org/imgmod/version"
 )
 
-var imgmodVersion = "0.0.2"
-
 func main() {
        imgmodHelpText := ""
        imgmodHelpEx := ""
@@ -68,7 +68,7 @@ func main() {
                Long:    versHelpText,
                Example: versHelpEx,
                Run: func(cmd *cobra.Command, args []string) {
-                       iutil.Printf("%s\n", imgmodVersion)
+                       iutil.Printf("imgmod %s\n", version.VersionStr())
                },
        }
        imgmodCmd.AddCommand(versCmd)
diff --git a/version/version.go b/version/version.go
new file mode 100644
index 0000000..811fc84
--- /dev/null
+++ b/version/version.go
@@ -0,0 +1,13 @@
+package version
+
+import "fmt"
+
+var (
+       Version   string = "unknown_version"
+       BuildDate string = "unknown_date"
+       GitState  string = "unknown_git_state"
+)
+
+func VersionStr() string {
+       return fmt.Sprintf("%s / %s / %s", Version, GitState, BuildDate)
+}