Add version string

Add `lib.Version` to get updated at build time.
Add --version flags to cashier and cashierd
Send client version in the signing request
Send server version in http response headers and in signing response
Set version at build time

2 files changed, 6 insertions, 0 deletions

diff --git a/lib/proto.go b/lib/proto.go
index a67ad47..5d8c67a 100644
--- a/lib/proto.go
+++ b/lib/proto.go
@@ -7,10 +7,12 @@ type SignRequest struct {
 	Key        string    `json:"key"`
 	ValidUntil time.Time `json:"valid_until"`
 	Message    string    `json:"message"`
+	Version    string    `json:"version"`
 }
 
 // SignResponse is sent by the server.
 type SignResponse struct {
 	Status   string `json:"status"`   // Status will be "ok" or "error".
 	Response string `json:"response"` // Response will contain either the signed certificate or the error message.
+	Version  string `json:"version"`
 }
diff --git a/lib/version.go b/lib/version.go
new file mode 100644
index 0000000..b59bca4
--- /dev/null
+++ b/lib/version.go
@@ -0,0 +1,4 @@
+package lib
+
+// Version string
+var Version = "unknown"