From 8351e352871f9403f613b319f750174564b79b28 Mon Sep 17 00:00:00 2001
From: Brian Meek <brian@hntlabs.com>
Date: Thu, 15 Sep 2022 15:00:36 -0700
Subject: [PATCH] Add commit hash to routing version API

Signed-off-by: Brian Meek <brian@hntlabs.com>
---
 build/docker/Dockerfile.monolith |  2 +-
 clientapi/routing/routing.go     | 16 +++-------------
 2 files changed, 4 insertions(+), 14 deletions(-)

diff --git a/build/docker/Dockerfile.monolith b/build/docker/Dockerfile.monolith
index 3180e9626..0745f696e 100644
--- a/build/docker/Dockerfile.monolith
+++ b/build/docker/Dockerfile.monolith
@@ -7,7 +7,7 @@ WORKDIR /build
 COPY . /build
 
 RUN mkdir -p bin
-RUN go build -trimpath -o bin/ ./cmd/dendrite-monolith-server
+RUN go build -ldflags="-X 'routing.CommitHash=`git rev-list -1 HEAD`'" -trimpath -o bin/ ./cmd/dendrite-monolith-server
 RUN go build -trimpath -o bin/ ./cmd/create-account
 RUN go build -trimpath -o bin/ ./cmd/generate-keys
 
diff --git a/clientapi/routing/routing.go b/clientapi/routing/routing.go
index ef4f8cafa..b39112154 100644
--- a/clientapi/routing/routing.go
+++ b/clientapi/routing/routing.go
@@ -19,8 +19,6 @@ import (
 	"net/http"
 	"strings"
 
-	"runtime/debug"
-
 	"github.com/gorilla/mux"
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/util"
@@ -44,16 +42,8 @@ import (
 	userapi "github.com/matrix-org/dendrite/userapi/api"
 )
 
-var commitHash = func() string {
-	if info, ok := debug.ReadBuildInfo(); ok {
-		for _, setting := range info.Settings {
-			if setting.Key == "vcs.revision" {
-				return setting.Value
-			}
-		}
-	}
-	return ""
-}()
+// Added in build script Cokerfile.monolith
+var CommitHash string
 
 // Setup registers HTTP handlers with the given ServeMux. It also supplies the given http.Client
 // to clients which need to make outbound HTTP requests.
@@ -128,7 +118,7 @@ func Setup(
 					"v1.0",
 					"v1.1",
 					"v1.2",
-				}, UnstableFeatures: unstableFeatures, CommitHash: commitHash},
+				}, UnstableFeatures: unstableFeatures, CommitHash: CommitHash},
 			}
 		}),
 	).Methods(http.MethodGet, http.MethodOptions)