Gradle: preBuild taks generates git.xml in res - usable with getString(R.string.git_hash)

.gitignore

@@ -31,3 +31,4 @@ gen/
 out/
 .gradle
 local.properties
+git.xml

mobile/com.sap.sailing.android.tracking.app/build.gradle

@@ -1,4 +1,5 @@
 apply plugin: "com.android.application"
+apply from: "../git.gradle"
 
 def packageName = "com.sap.sailing.android.tracking.app"
 def verCode = 1

mobile/com.sap.sailing.racecommittee.app/build.gradle

@@ -1,4 +1,5 @@
 apply plugin: "com.android.application"
+apply from: "../git.gradle"
 
 def packageName = "com.sap.sailing.racecommittee.app"
 def verCode = 6

mobile/git.gradle

@@ -0,0 +1,30 @@
+/**
+ * returns current git hash
+ */
+def getGitHash = { ->
+    def stdout = new ByteArrayOutputStream()
+    exec {
+        commandLine "git", "log", "-n", "1", "--format='%h'"
+        standardOutput = stdout
+    }
+    return stdout.toString().trim().replace("'", "")
+}
+
+/**
+ * set git hash into git.xml
+ */
+preBuild.doLast {
+    copy {
+        from ("../git.template.xml")
+
+        into ("res/values")
+
+        rename {
+            String fileName -> fileName.replace(".template", "")
+        }
+
+        filter {
+            String line -> line.replaceAll("#GITHASH#", getGitHash())
+        }
+    }
+}

mobile/git.template.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <string name="git_hash" translatable="false">#GITHASH#</string>
+
+</resources>