From 43abbdec5f97090b1192c6cea083a3a6f8bd2739 Mon Sep 17 00:00:00 2001
From: Mike Ball <mikedball@gmail.com>
Date: Tue, 25 Oct 2022 09:59:36 -0400
Subject: [PATCH] create make target ensuring unique version

---
 Makefile                         |  5 ++++-
 scripts/ensure-unique-version.sh | 17 +++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100755 scripts/ensure-unique-version.sh

diff --git a/Makefile b/Makefile
index 13d5ba3..00574a9 100644
--- a/Makefile
+++ b/Makefile
@@ -31,7 +31,10 @@ fmtcheck:
 	test -z $(shell go fmt $(SOURCE))
 .PHONY: fmtcheck
 
-tag:
+check-tag:
+	./scripts/ensure-unique-version.sh "$(VERSION)"
+
+tag: check-tag
 	echo "creating git tag $(VERSION)"
 	git tag $(VERSION)
 	git push origin $(VERSION)
diff --git a/scripts/ensure-unique-version.sh b/scripts/ensure-unique-version.sh
new file mode 100755
index 0000000..8ee738a
--- /dev/null
+++ b/scripts/ensure-unique-version.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+version="${1}"
+repo="mdb/gh-dispatch"
+
+result="$(curl \
+  --header "Accept: application/vnd.github.v3+json" \
+  --write "%{http_code}" \
+  --out "/dev/null" \
+  "https://api.github.com/repos/${repo}/releases/tags/${version}")"
+
+if [ "${result}" = "404" ]; then
+  exit 0
+fi
+
+echo "${version} is an existing ${repo} release"
+exit 1