devtools: add pre-push hook check for version mismatch (#112)

Move existing script into a devtools directory.

Add a script that when used as a pre-push hook, will check that
the version in the code matches the latest version tag.

devtools/pre-push-hook.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+# This script checks that the version in the code matches the latest version
+# tag.
+#
+# Install as a pre-push hook from the repo root with:
+#   cp devtools/pre-push-hook.sh .git/hooks/pre-push
+
+version_file=genai/internal/version.go
+latest_tag=$(git tag -l 'v*' | sort -V | tail -1)
+code_version=v$(awk '/^const Version/ {print substr($4, 2, length($4)-2)}' $version_file)
+
+if [[ $latest_tag == $code_version ]]; then
+  exit 0
+fi
+
+echo "version $code_version in $version_file does not match latest tag $latest_tag."
+exit 1

genai/files.go

@@ -14,7 +14,7 @@
 
 package genai
 
-//go:generate ./generate_discovery_client.sh
+//go:generate ../devtools/generate_discovery_client.sh
 
 import (
 	"context"