do-not-rebuild-same-commit.ps1

# $env:API_KEY should be defined as a secure variable

$headers = @{
  "Authorization" = "$env:API_KEY"
  "Content-type" = "application/json"
}

$apiURL = "https://ci.appveyor.com/api/projects/$env:APPVEYOR_ACCOUNT_NAME/$env:APPVEYOR_PROJECT_SLUG"
$history = Invoke-RestMethod -Uri "$apiURL/history?recordsNumber=5" -Headers $headers  -Method Get

if ($history.builds.Count -eq 5)
{
    $previousBuild = $history.builds | ? {($_.commitId -eq $env:APPVEYOR_REPO_COMMIT) -and ($_.buildId -ne $env:APPVEYOR_BUILD_ID)} | Sort-Object -Property created -Descending | Select-Object -First 1
    if ($previousBuild) {
        if ($previousBuild.status -eq "success") {
            Write-Host "Commit $env:APPVEYOR_REPO_COMMIT was already built with success"
            Exit-AppveyorBuild
        }
        elseif ($previousBuild.status -eq "failed") {
            Throw "Commit $env:APPVEYOR_REPO_COMMIT was already already built with failure"
        }
        else {
            Write-Host "Commit $env:APPVEYOR_REPO_COMMIT was already built, but without either success or failure, continuing..."
        }
    }
}