Include bin info (commit hash and if changed) on tool (#90)

Makefile

@@ -29,7 +29,9 @@ fmt:
 	$(GOFMT) ./...
 
 ftsb_redisearch: test
-	$(GOBUILD) -o bin/$@ ./cmd/$@
+	$(GOBUILD) \
+		-ldflags=$(LDFLAGS) \
+		-o bin/$@ ./cmd/$@
 
 get:
 	$(GOGET) ./...

cmd/ftsb_redisearch/bin_info.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"strconv"
+	"strings"
+)
+
+// Vars only for git sha and diff handling
+var GitSHA1 string = ""
+var GitDirty string = "0"
+
+// internal function to return value of GitSHA1 var, which is filled in link time
+func toolGitSHA1() string {
+	return GitSHA1
+}
+
+// this internal function will check for the number of altered lines that are not yet committed
+// and return true in that case
+func toolGitDirty() (dirty bool) {
+	dirty = false
+	dirtyLines, err := strconv.Atoi(strings.TrimSpace(GitDirty))
+	if err == nil {
+		dirty = (dirtyLines != 0)
+	}
+	return
+}

cmd/ftsb_redisearch/main.go

@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"flag"
 	"github.com/RediSearch/ftsb/benchmark_runner"
+	"log"
 )
 
 // Program option vars:
@@ -71,5 +72,11 @@ func (b *benchmark) GetProcessor() benchmark_runner.Processor {
 
 func main() {
 	b := benchmark{}
+	git_sha := toolGitSHA1()
+	git_dirty_str := ""
+	if toolGitDirty() {
+		git_dirty_str = "-dirty"
+	}
+	log.Printf("ftsb (git_sha1:%s%s)\n", git_sha, git_dirty_str)
 	loader.RunBenchmark(&b, benchmark_runner.SingleQueue)
 }