From bae738e55cc7949d0635158a52e822e46de2d7c0 Mon Sep 17 00:00:00 2001
From: AlphaYankee <54741936+AlphaYankee@users.noreply.github.com>
Date: Thu, 29 Aug 2024 23:53:18 +0200
Subject: [PATCH] Do not return the tag as branch name for GitLab CI

In case of a tag pipeline, return null as branch name instead of the tag
---
 src/GitVersion.BuildAgents/Agents/GitLabCi.cs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/GitVersion.BuildAgents/Agents/GitLabCi.cs b/src/GitVersion.BuildAgents/Agents/GitLabCi.cs
index 0956084ab7..23c0e912a1 100644
--- a/src/GitVersion.BuildAgents/Agents/GitLabCi.cs
+++ b/src/GitVersion.BuildAgents/Agents/GitLabCi.cs
@@ -21,7 +21,18 @@ public override string[] GenerateSetParameterMessage(string name, string? value)
         $"GitVersion_{name}={value}"
     ];
 
-    public override string? GetCurrentBranch(bool usingDynamicRepos) => Environment.GetEnvironmentVariable("CI_COMMIT_REF_NAME");
+    public override string? GetCurrentBranch(bool usingDynamicRepos)
+    {
+        // CI_COMMIT_REF_NAME can contain either the branch or the tag
+        // See https://docs.gitlab.com/ee/ci/variables/predefined_variables.html
+
+        // CI_COMMIT_TAG is only available in tag pipelines,
+        // so we can exit if CI_COMMIT_REF_NAME would return the tag
+        if (!string.IsNullOrEmpty(Environment.GetEnvironmentVariable("CI_COMMIT_TAG")))
+            return null;
+
+        return Environment.GetEnvironmentVariable("CI_COMMIT_REF_NAME");
+    }
 
     public override bool PreventFetch() => true;