# Source version sample with AWS CodeBuild
<a name="sample-source-version"></a>

 This sample demonstrates how to specify a version of your source using a format other than a commit ID (also known as a commit SHA). You can specify the version of your source in the following ways: 
+  For an Amazon S3 source provider, use the version ID of the object that represents the build input ZIP file. 
+  For CodeCommit, Bitbucket, GitHub, and GitHub Enterprise Server, use one of the following: 
  +  Pull request as a pull request reference (for example, `refs/pull/1/head`). 
  +  Branch as a branch name. 
  +  Commit ID. 
  +  Tag. 
  +  Reference and a commit ID. The reference can be one of the following:
    +  A tag (for example, `refs/tags/mytagv1.0^{full-commit-SHA}`). 
    +  A branch (for example, `refs/heads/mydevbranch^{full-commit-SHA}`). 
    +  A pull request (for example, `refs/pull/1/head^{full-commit-SHA}`). 
+  For GitLab and GitLab Self Managed, use one of the following: 
  +  Branch as a branch name. 
  +  Commit ID. 
  +  Tag. 

**Note**  
 You can specify the version of a pull request source only if your repository is GitHub or GitHub Enterprise Server. 

 If you use a reference and a commit ID to specify a version, the `DOWNLOAD_SOURCE` phase of your build is faster than if you provide the version only. This is because when you add a reference, CodeBuild does not need to download the entire repository to find the commit. 
+ You can specify a source version with only a commit ID, such as `12345678901234567890123467890123456789`. If you do this, CodeBuild must download the entire repository to find the version.
+ You can specify a source version with a reference and a commit ID in this format: `{{refs}}/{{heads}}/{{branchname}}^{{{full-commit-SHA}}}` (for example, `refs/heads/main^{12345678901234567890123467890123456789}`). If you do this, CodeBuild downloads only the specified branch to find the version. .

**Note**  
To speed up the `DOWNLOAD_SOURCE` phase of your build, you can also to set **Git clone depth** to a low number. CodeBuild downloads fewer versions of your repository.

**Topics**
+ [Specify a GitHub repository version with a commit ID](sample-source-version-github.md)
+ [Specify a GitHub repository version with a reference and commit ID](sample-source-version-github-ref.md)