Objective :

To create a pull request to merge the feature branch into the master branch after various approvals.

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Step 1 : Create a feature branch and push the code changes into the feature branch.

Through AWS Console : — The developer who creates the pull request (another IAM user) needs to have console login access for the particular AWS account.

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Step 2 : Create Pull Request

1. Select CodeCommit in the services search bar.

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2 . Select the repository in which you made the code changes and would like to create a pull request

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3. Select Create pull request

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4 . Select the source and destination branches (usually, destination branch will be master) and select Compare

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5 . Select a title and description (optional) and check the Changes made in the commit of the source branch and select Create pull request

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Step 3 (optional) : Specify the approval rule details

The pull request gets created successfully. Select Approvals and create approval rule for the pull request by selecting the Create approval rule

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Select Create approval rule and specify the approval rules

NOTE : The rule will not be satisfied unless the number of approvals is fulfilled and also, the specified IAM users approve the pull request. ( Eg : If the number of approvals is 1, but there are 2 IAM users added as reviewers, the rule does not satisfy unless both the IAM users give approval )

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Approval Status :

The approval rule is not satisfied so far and the status will be “Rules not satisfied”

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Step 4 : Approve Pull Request

Select the Pull request you want to approve.

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In Changes, the reviewer can view the changes and select Approve to approve the changes.

Approval can be revoked by selecting Revoke approval

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Step 5 : Merge the Pull request

After all approvals are done, the reviewer can merge the code into master branch

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After selecting Merge, select Fast forward merge, check the option — Delete source branch “source_branchname” after merging

Select Merge pull request

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Merge success :

We can see the Success message for the merge done.

NOTE : Checkout to master branch in your code and do “git pull” to get the latest updated code.

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NOTE : Deny merge to master for the one (usually, developer) who created the pull request.

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Create a JSON policy and attach the below JSON policy to the IAM user who created the pull request.

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• Effect -> Denying the merge access to any specified branch ( Possible values : “Allow”, “Deny”)

• Resource -> arn of the repository name (can be found in the Settings of the repo)

• “refs/heads/master” -> The branch for which the merge should be denied.

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If the above policy is added, it denies the developer who created the pull request from merging his/her feature branch to the master branch.

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Alternate way — Through AWS CLI :

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Step 2 : Create Pull request

Install aws cli and configure the aws credentials for the IAM user, ( if not configured before )

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> aws configure

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To create a pull request,

(description is optional)

– title -> Title of the pull request

– description -> Description of the pull request

repository Name -> Represents the name of the repository

source Reference -> Name of the source branch

destination Reference -> Name of the destination branch ( by default, it takes main branch )

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If Success, a JSON will be produced as an output.

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Step 3 (Optional) : Specify the approval rules

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–pull-request-id -> Id of the pull request ( available in the create pull request output JSON )

–approval-rule-name -> Name of the approval rule

–approval-rule-content -> Approval rule content

Version → Specifies the version

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Statements:

Type -> Approvers

NumberOfApprovals -> The number of total approvals needed for the pull request

ApprovalPoolMembers -> The IAM users who can approve the pull request

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If Success, a JSON will be produced as an output.

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Step 4 : Approve pull request

–pull-request-id -> Id of the pull request ( available in the create pull request output JSON )

–revision-id -> Revision id of the pull request ( available in the create pull request output JSON )

–approval-state -> Approval state of the pull request you want to provide ( “APPROVE” or “REVOKE” )

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If Success, nothing will be returned.

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Step 5 : Merge pull request

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–pull-request-id -> Id of the pull request ( available in the create pull request output JSON )

–source-commit-id -> Source commit id ( available in the create pull request output JSON )

–repository-name -> Represents the name of the repository

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If Success, a JSON will be produced as an output.

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