handle error in diff check

Author: X1011

deploy.sh

@@ -40,14 +40,16 @@ git --work-tree "$deploy_directory" reset --mixed --quiet
 
 git --work-tree "$deploy_directory" add --all
 
-if git --work-tree "$deploy_directory" diff --exit-code --quiet HEAD; then
-	echo No changes to files in $deploy_directory. Skipping commit.
-else
-	set_user_id
-	git --work-tree "$deploy_directory" commit -m \
-		"publish: $commit_title"$'\n\n'"generated from commit $commit_hash"
-	git push origin $deploy_branch
-fi
+case `git --work-tree "$deploy_directory" diff --exit-code --quiet HEAD` in
+	0) echo No changes to files in $deploy_directory. Skipping commit.;;
+	1)
+		set_user_id
+		git --work-tree "$deploy_directory" commit -m \
+			"publish: $commit_title"$'\n\n'"generated from commit $commit_hash"
+		git push origin $deploy_branch
+		;;
+	*) exit 1;;
+esac
 
 if [[ $previous_branch = "HEAD" ]]; then
 	#we weren't on any branch before, so just set HEAD back to the commit it was on