diff --git a/.gitignore b/.gitignore
index 9c5cf7b01..955683428 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 *.iml
 .gradle
 build
+!**/src/main/**/build
 local.properties
 out
 userHome
diff --git a/build.gradle.kts b/build.gradle.kts
index 5242a2642..207d30cb8 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -9,6 +9,7 @@ buildscript {
 }
 
 plugins {
+    id("com.github.triplet.gradle.build")
     id("com.github.ben-manes.versions") version "0.25.0"
 }
 
@@ -20,23 +21,6 @@ tasks.register<Delete>("clean") {
     delete("build")
 }
 
-tasks.register("ciBuild") {
-    val isMaster = System.getenv("CIRCLE_BRANCH") == "master"
-    val isPr = System.getenv("CIRCLE_PULL_REQUEST") != null
-    val isSnapshot = project("plugin").version.toString().contains("snapshot", true)
-
-    fun allTasks(name: String) = allprojects.mapNotNull { it.tasks.findByName(name) }
-    if (isMaster && !isPr) { // Release build
-        if (isSnapshot) {
-            dependsOn(allTasks("build"), allTasks("publish"))
-        } else {
-            dependsOn(allTasks("build"))
-        }
-    } else {
-        dependsOn(allTasks("check"))
-    }
-}
-
 allprojects {
     repositories.deps()
 
diff --git a/buildSrc/build.gradle.kts b/buildSrc/build.gradle.kts
index 64c90a6db..2b722deda 100644
--- a/buildSrc/build.gradle.kts
+++ b/buildSrc/build.gradle.kts
@@ -10,3 +10,7 @@ tasks.withType<ValidateTaskProperties>().configureEach {
     enableStricterValidation = true
     failOnWarning = true
 }
+
+dependencies {
+    implementation("org.ajoberstar.grgit:grgit-gradle:3.1.1")
+}
diff --git a/buildSrc/src/main/kotlin/com/github/triplet/gradle/build/GPPBuildPlugin.kt b/buildSrc/src/main/kotlin/com/github/triplet/gradle/build/GPPBuildPlugin.kt
new file mode 100644
index 000000000..49d7745e0
--- /dev/null
+++ b/buildSrc/src/main/kotlin/com/github/triplet/gradle/build/GPPBuildPlugin.kt
@@ -0,0 +1,49 @@
+package com.github.triplet.gradle.build
+
+import org.ajoberstar.grgit.Grgit
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.gradle.api.Task
+
+class GPPBuildPlugin : Plugin<Project> {
+    private val isMaster get() = System.getenv("CIRCLE_BRANCH") == "master"
+    private val isPr get() = System.getenv("CIRCLE_PULL_REQUEST") != null
+
+    override fun apply(project: Project) {
+        check(project === project.rootProject) { "Cannot apply build plugin to subprojects." }
+
+        project.tasks.register("ciBuild") {
+            if (isReleaseBuild()) {
+                val buildTasks = allTasks("build")
+
+                dependsOn(buildTasks)
+                if (isSnapshotBuild()) {
+                    dependsOn(allTasks("publish").mustRunAfter(buildTasks))
+                } else if (isPublishBuild()) {
+                    dependsOn(allTasks("publishPlugins").mustRunAfter(buildTasks))
+                }
+            } else {
+                dependsOn(allTasks("check"))
+            }
+        }
+    }
+
+    private fun isReleaseBuild() = isMaster && !isPr
+
+    private fun Task.isSnapshotBuild() =
+            project.allprojects.any { it.version.toString().contains("snapshot", true) }
+
+    private fun Task.isPublishBuild() = Grgit.open { dir = project.rootDir }.use {
+        if (!it.status().isClean) return@use false
+
+        val latestCommit = it.head()
+        val latestTag = it.tag.list().maxBy { it.commit.dateTime } ?: return@use false
+
+        latestCommit.id == latestTag.commit.id
+    }
+
+    private fun Task.allTasks(name: String) =
+            project.allprojects.mapNotNull { it.tasks.findByName(name) }
+
+    private fun List<Task>.mustRunAfter(tasks: List<Task>) = onEach { it.mustRunAfter(tasks) }
+}
diff --git a/buildSrc/src/main/resources/META-INF/gradle-plugins/com.github.triplet.gradle.build.properties b/buildSrc/src/main/resources/META-INF/gradle-plugins/com.github.triplet.gradle.build.properties
new file mode 100644
index 000000000..cc8af8645
--- /dev/null
+++ b/buildSrc/src/main/resources/META-INF/gradle-plugins/com.github.triplet.gradle.build.properties
@@ -0,0 +1 @@
+implementation-class=com.github.triplet.gradle.build.GPPBuildPlugin