# MergeBranchesByFastForward
<a name="API_MergeBranchesByFastForward"></a>

Merges two branches using the fast-forward merge strategy.

## Request Syntax
<a name="API_MergeBranchesByFastForward_RequestSyntax"></a>

```
{
   "destinationCommitSpecifier": "string",
   "repositoryName": "string",
   "sourceCommitSpecifier": "string",
   "targetBranch": "string"
}
```

## Request Parameters
<a name="API_MergeBranchesByFastForward_RequestParameters"></a>

For information about the parameters that are common to all actions, see [Common Parameters](CommonParameters.md).

The request accepts the following data in JSON format.

 ** [destinationCommitSpecifier](#API_MergeBranchesByFastForward_RequestSyntax) **   <a name="CodeCommit-MergeBranchesByFastForward-request-destinationCommitSpecifier"></a>
The branch, tag, HEAD, or other fully qualified reference used to identify a commit (for example, a branch name or a full commit ID).  
Type: String  
Required: Yes

 ** [repositoryName](#API_MergeBranchesByFastForward_RequestSyntax) **   <a name="CodeCommit-MergeBranchesByFastForward-request-repositoryName"></a>
The name of the repository where you want to merge two branches.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 100.  
Pattern: `[\w\.-]+`   
Required: Yes

 ** [sourceCommitSpecifier](#API_MergeBranchesByFastForward_RequestSyntax) **   <a name="CodeCommit-MergeBranchesByFastForward-request-sourceCommitSpecifier"></a>
The branch, tag, HEAD, or other fully qualified reference used to identify a commit (for example, a branch name or a full commit ID).  
Type: String  
Required: Yes

 ** [targetBranch](#API_MergeBranchesByFastForward_RequestSyntax) **   <a name="CodeCommit-MergeBranchesByFastForward-request-targetBranch"></a>
The branch where the merge is applied.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 256.  
Required: No

## Response Syntax
<a name="API_MergeBranchesByFastForward_ResponseSyntax"></a>

```
{
   "commitId": "string",
   "treeId": "string"
}
```

## Response Elements
<a name="API_MergeBranchesByFastForward_ResponseElements"></a>

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

 ** [commitId](#API_MergeBranchesByFastForward_ResponseSyntax) **   <a name="CodeCommit-MergeBranchesByFastForward-response-commitId"></a>
The commit ID of the merge in the destination or target branch.  
Type: String

 ** [treeId](#API_MergeBranchesByFastForward_ResponseSyntax) **   <a name="CodeCommit-MergeBranchesByFastForward-response-treeId"></a>
The tree ID of the merge in the destination or target branch.  
Type: String

## Errors
<a name="API_MergeBranchesByFastForward_Errors"></a>

For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).

 ** BranchDoesNotExistException **   
The specified branch does not exist.  
HTTP Status Code: 400

 ** BranchNameIsTagNameException **   
The specified branch name is not valid because it is a tag name. Enter the name of a branch in the repository. For a list of valid branch names, use [ListBranches](API_ListBranches.md).  
HTTP Status Code: 400

 ** BranchNameRequiredException **   
A branch name is required, but was not specified.  
HTTP Status Code: 400

 ** CommitDoesNotExistException **   
The specified commit does not exist or no commit was specified, and the specified repository has no default branch.  
HTTP Status Code: 400

 ** CommitRequiredException **   
A commit was not specified.  
HTTP Status Code: 400

 ** ConcurrentReferenceUpdateException **   
The merge cannot be completed because the target branch has been modified. Another user might have modified the target branch while the merge was in progress. Wait a few minutes, and then try again.  
HTTP Status Code: 400

 ** EncryptionIntegrityChecksFailedException **   
An encryption integrity check failed.  
HTTP Status Code: 500

 ** EncryptionKeyAccessDeniedException **   
An encryption key could not be accessed.  
HTTP Status Code: 400

 ** EncryptionKeyDisabledException **   
The encryption key is disabled.  
HTTP Status Code: 400

 ** EncryptionKeyNotFoundException **   
No encryption key was found.  
HTTP Status Code: 400

 ** EncryptionKeyUnavailableException **   
The encryption key is not available.  
HTTP Status Code: 400

 ** InvalidBranchNameException **   
The specified reference name is not valid.  
HTTP Status Code: 400

 ** InvalidCommitException **   
The specified commit is not valid.  
HTTP Status Code: 400

 ** InvalidRepositoryNameException **   
A specified repository name is not valid.  
This exception occurs only when a specified repository name is not valid. Other exceptions occur when a required repository parameter is missing, or when a specified repository does not exist.
HTTP Status Code: 400

 ** InvalidTargetBranchException **   
The specified target branch is not valid.  
HTTP Status Code: 400

 ** ManualMergeRequiredException **   
The pull request cannot be merged automatically into the destination branch. You must manually merge the branches and resolve any conflicts.  
HTTP Status Code: 400

 ** RepositoryDoesNotExistException **   
The specified repository does not exist.  
HTTP Status Code: 400

 ** RepositoryNameRequiredException **   
A repository name is required, but was not specified.  
HTTP Status Code: 400

 ** TipsDivergenceExceededException **   
The divergence between the tips of the provided commit specifiers is too great to determine whether there might be any merge conflicts. Locally compare the specifiers using `git diff` or a diff tool.  
HTTP Status Code: 400

## Examples
<a name="API_MergeBranchesByFastForward_Examples"></a>

### Example
<a name="API_MergeBranchesByFastForward_Example_1"></a>

This example illustrates one usage of MergeBranchesByFastForward.

#### Sample Request
<a name="API_MergeBranchesByFastForward_Example_1_Request"></a>

```
>POST / HTTP/1.1
Host: codecommit.us-east-1.amazonaws.com
Accept-Encoding: identity
Content-Length: 226
X-Amz-Target: CodeCommit_20150413.MergeBranchesByFastForward
X-Amz-Date: 20190428T213222Z
User-Agent: aws-cli/1.16.137 Python/3.6.0 Windows/10
Content-Type: application/x-amz-json-1.1
Authorization: AWS4-HMAC-SHA256 Credential=AKIAI44QH8DHBEXAMPLE/20151028/us-east-1/codecommit/aws4_request, SignedHeaders=content-type;host;user-agent;x-amz-date;x-amz-target, Signature=8d9b5998EXAMPLE

{
  "repositoryName": "MyDemoRepo",
  "destinationCommitSpecifier": "bugfix-bug1234",
  "sourceCommitSpecifier": "main",
  "targetBranch": "main-preprod"
}
```

#### Sample Response
<a name="API_MergeBranchesByFastForward_Example_1_Response"></a>

```
HTTP/1.1 200 OK
x-amzn-RequestId: 0728aaa8-EXAMPLE
Content-Type: application/x-amz-json-1.1
Content-Length: 1681
Date: Sun, 28 Apr 2019 22:43:13 GMT

{
    "commitId": "4f178133EXAMPLE",
    "treeId": "389765daEXAMPLE"
}
```

## See Also
<a name="API_MergeBranchesByFastForward_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/codecommit-2015-04-13/MergeBranchesByFastForward) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/codecommit-2015-04-13/MergeBranchesByFastForward) 
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/codecommit-2015-04-13/MergeBranchesByFastForward) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/codecommit-2015-04-13/MergeBranchesByFastForward) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/codecommit-2015-04-13/MergeBranchesByFastForward) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/codecommit-2015-04-13/MergeBranchesByFastForward) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/codecommit-2015-04-13/MergeBranchesByFastForward) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/codecommit-2015-04-13/MergeBranchesByFastForward) 
+  [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/codecommit-2015-04-13/MergeBranchesByFastForward) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/codecommit-2015-04-13/MergeBranchesByFastForward)