From 56427a7eacf83dd755cff9906a7d4f414ee55e43 Mon Sep 17 00:00:00 2001
From: Elliot Metsger <emetsger@jhu.edu>
Date: Thu, 15 Oct 2020 11:50:55 -0400
Subject: [PATCH] Use the output of git-describe to tag images when the version
 property is absent or the empty string.

---
 build.gradle.kts  | 13 +++++++++++++
 gradle.properties |  3 ++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/build.gradle.kts b/build.gradle.kts
index e8af902c..aa777d3b 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,9 +1,22 @@
 buildscript {
     repositories {
         gradlePluginPortal()
+        maven {
+            url = uri("https://plugins.gradle.org/m2/")
+        }
     }
     dependencies {
         classpath("ca.islandora:isle-gradle-docker-plugin:0.0.1")
+        classpath("com.palantir.gradle.gitversion:gradle-git-version:0.12.3")
     }
 }
+
+allprojects {
+    apply(plugin = "com.palantir.git-version")
+    val gitVersion: groovy.lang.Closure<String> by extra
+    if (version == "unspecified" || version.toString().trim() == "") {
+      version = gitVersion()
+    }
+}
+
 apply(plugin = "ca.islandora.gradle.docker")
diff --git a/gradle.properties b/gradle.properties
index f72501a1..c04bdac0 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,5 +1,6 @@
 org.gradle.parallel=true
-# Will be used as a tag to denote the images release.
+# Will be used as a tag to denote the images release.  If this property is empty or undefined, the version will be
+# obtained by the output of git-describe.
 version=0.0.1
 # The project can be build with/without Buildkit for those on older versions of Docker earlier than '18.09' or who
 # cannot use the 'overlay2' filesystem with Docker due to using an earlier kernel version than 4.0.