view: Add /version endpoint

This allows to get the server version via HTTP. The output of `git
describe --dirty --always` and a line break is returned together with
HTTP 200.

If the server build contains no version information an error message and
HTTP 404 is returned.

1 files changed, 17 insertions, 0 deletions

diff --git a/view/version.go b/view/version.go
new file mode 100644
index 0000000..faf91b1
--- /dev/null
+++ b/view/version.go
@@ -0,0 +1,17 @@
+package view
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func VersionRead(version string) func(http.ResponseWriter, *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if version == "" {
+			http.Error(w, "This build has no version information", http.StatusNotFound)
+			return
+		}
+
+		fmt.Fprintln(w, version)
+	}
+}