Copy all Azure DevOps branch policies from one branch to another using Azure CLI

Copy-BranchPolicies.ps1

# Description: Copies branch policies from one branch to another branch
# Run the script in the root of the git repository

[CmdletBinding()]

param(    
    [Parameter(Mandatory = $true)]
    [string] $RepositoryName,
    [Parameter(Mandatory = $true)]
    [string] $FromBranch,
    [Parameter(Mandatory = $true)]
    [string] $ToBranch,
    [Parameter(Mandatory = $true)]
    [ValidateNotNullOrEmpty()]
    [ValidateSet('exact', 'prefix')]
    [string] $ToBranchMatchType
)

$ErrorActionPreference = 'Stop';

# Get id of the repo
$repositoryId = az repos list --query "[?name=='$RepositoryName'].id | [0]"
$repositoryId

# Get all policies from branch
#az repos policy list --query "[?contains(settings.scope[].repositoryId,'$repositoryId')] | [?contains(settings.scope[].refName, 'refs/heads/$FromBranch')]"

# List all policies in table format with relevant information
#az repos policy list --query "[?contains(settings.scope[].repositoryId,'$repositoryId')] | [?contains(settings.scope[].refName, 'refs/heads/$FromBranch')] | [].{Type:type.displayName, BuildDefinitionId:settings.buildDefinitionId, Name:settings.displayName, Branch:settings.scope[0].refName}" --output table

$policies = az repos policy list --query "[?contains(settings.scope[].repositoryId,'$repositoryId')] | [?contains(settings.scope[].refName, 'refs/heads/$FromBranch')]" | ConvertFrom-Json

foreach ($policy in $policies) {
    # See documentation on how to create a branch policy https://learn.microsoft.com/en-us/azure/devops/repos/git/branch-policies?view=azure-devops&tabs=azure-devops-cli
    Write-Host "Create policy of the type '$($policy.type.displayName)'"
    $completeToBranch = "refs/heads/$ToBranch"

    switch ($policy.type.displayName) {
        'Build' { 
            Write-Host "Create policy '$($policy.settings.displayName)'"

            # Join path filter with ; as separator
            $pathFilter = $null
            if ($null -ne $policy.settings.filenamePatterns) {
                $pathFilter = $policy.settings.filenamePatterns -join ';'
            }

            # Create branch build policy
            if ($null -eq $pathFilter) {
                az repos policy build create `
                    --repository-id $repositoryId `
                    --branch $completeToBranch  `
                    --branch-match-type $ToBranchMatchType `
                    --enabled $policy.isEnabled `
                    --blocking $policy.isBlocking `
                    --queue-on-source-update-only $policy.settings.queueOnSourceUpdateOnly `
                    --manual-queue-only $policy.settings.manualQueueOnly `
                    --valid-duration $policy.settings.validDuration `
                    --build-definition-id $policy.settings.buildDefinitionId `
                    --display-name $policy.settings.displayName
            }
            else {                
                az repos policy build create `
                    --repository-id $repositoryId `
                    --branch $completeToBranch  `
                    --branch-match-type $ToBranchMatchType `
                    --enabled $policy.isEnabled `
                    --blocking $policy.isBlocking `
                    --queue-on-source-update-only $policy.settings.queueOnSourceUpdateOnly `
                    --manual-queue-only $policy.settings.manualQueueOnly `
                    --valid-duration $policy.settings.validDuration `
                    --build-definition-id $policy.settings.buildDefinitionId `
                    --display-name $policy.settings.displayName `
                    --path-filter $pathFilter
            }
        }
        'Minimum number of reviewers' {
            #Known bug: https://github.com/Azure/azure-devops-cli-extension/issues/1091
            #--block-lastPusherVote $policy.settings.blockLastPusherVote `

            az repos policy approver-count create `
                --repository-id $repositoryId `
                --branch $completeToBranch `
                --branch-match-type $ToBranchMatchType `
                --enabled $policy.isEnabled `
                --blocking $policy.settings.blockLastPusherVote `
                --allow-downvotes $policy.settings.allowDownvotes `
                --creator-vote-counts $policy.settings.creatorVoteCounts `
                --minimum-approver-count $policy.settings.minimumApproverCount `
                --reset-on-source-push $policy.settings.resetOnSourcePush
        }
        'Work item linking' {
            az repos policy work-item-linking create `
                --repository-id $repositoryId `
                --branch $completeToBranch `
                --branch-match-type $ToBranchMatchType `
                --enabled $policy.isEnabled `
                --blocking $policy.isBlocking
        }
        'Comment requirements' {
            az repos policy comment-required create `
                --repository-id $repositoryId `
                --branch $completeToBranch `
                --branch-match-type $ToBranchMatchType `
                --enabled $policy.isEnabled `
                --blocking $policy.isBlocking
        }
        'Require a merge strategy' {
            $allowNoFastForward = $false
            if ($null -ne $policy.settings.allowNoFastForward) { $allowNoFastForward = $policy.settings.allowNoFastForward }

            $allowRebase = $false
            if ($null -ne $policy.settings.allowRebase) { $allowRebase = $policy.settings.allowRebase }
            
            $allowRebaseMerge = $false
            if ($null -ne $policy.settings.allowRebaseMerge) { $allowRebaseMerge = $policy.settings.allowRebaseMerge }

            $allowSquash = $false
            if ($null -ne $policy.settings.allowSquash) { $allowSquash = $policy.settings.allowSquash }

            az repos policy merge-strategy create `
                --repository-id $repositoryId `
                --branch $completeToBranch `
                --branch-match-type $ToBranchMatchType `
                --enabled $policy.isEnabled `
                --blocking $policy.isBlocking `
                --allow-no-fast-forward $allowNoFastForward `
                --allow-rebase $allowRebase `
                --allow-rebase-merge $allowRebaseMerge `
                --allow-squash $allowSquash
        }
        Default {
            Write-Host "Policy type '$($policy.type.displayName)' is not supported"
        }
    }
}