UpdateReviewSessionFilesPullRequestsBaseCommit.yml

# Copyright (c) Robert Bosch GmbH
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at https://mozilla.org/MPL/2.0/.

name: Update Review Session Files for Pull Requests on base commit

on:
  push:

env:
  ModelName: DemoModel
  ModelExtension: eapx
  ReviewSessionURL:  https://nexus.lieberlieber.com/repository/lemontree-session
  LemonTreePipelineToolsRemovePrerenderedDiagramsExecutable: https://nexus.lieberlieber.com/repository/lemontree-pipeline-tools/LemonTree.Pipeline.Tools.RemovePrerenderedDiagrams.exe 

jobs:
  build:
    defaults:
      run:
        shell: pwsh
    # The type of runner that the job will run on
    runs-on: windows-latest
    timeout-minutes: 15
    steps:
      - name: Check for related Pull Requests
        id: linked_prs
        uses: actions/github-script@v6
        with:
          result-encoding: string
          script: |
            const response = await github.rest.pulls.list({
              owner: context.repo.owner,
              repo: context.repo.repo
            })
            console.log("this repo ref:", context.ref)
            if (response.status != 200) {
              console.error("ohnoes")
              process.exit()
            }
            const openPR = response.data
            const affectedPR = openPR.filter(pr => `refs/heads/${pr.base.ref}` == context.ref)
            console.log(`Found ${affectedPR.length} affected PRs: ${affectedPR.map(pr => pr.number).join(", ")}`)
            return JSON.stringify(affectedPR, 2)
            
      - name: Check number of affected PRs
        id: checkNumber
        env:
          jsVar: ${{steps.linked_prs.outputs.result}}
        run: |
          $prList = $env:jsVar | ConvertFrom-Json
          echo "count=$($prList.length)" >> $env:GITHUB_OUTPUT
          
      - uses: actions/checkout@v4
        if: ${{ steps.checkNumber.outputs.count > 0}}
        with:
          lfs: true
          fetch-depth: 0

      # download Lemontree.Automation on a runner and setup the license
      - uses: LieberLieber/setup-LemonTree.Automation@v5
        if: ${{ steps.checkNumber.outputs.count > 0}}
        id: GetLTA
        with:
          License: ${{secrets.LTALICENSE}} 
      #ExeLocation &"${{steps.GetLTA.outputs.LemonTreeAutomationExecutable}}"

      - name: Iterate over Pull Requests
        if: ${{ steps.checkNumber.outputs.count > 0}}
        id: WorkOnPr
        env:
         jsVar: ${{steps.linked_prs.outputs.result}}
        run: |
          #Create review session files for each pull requestReviewers
          echo "Starting process"
          function getCommitIds($baseRef, $headRef)
          {
            $ret =@{}
            $ret["baseId"] = git merge-base origin/$baseRef origin/$headRef
            $ret["sourceId"] = git show-ref --hash origin/$headRef            
            $ret["targetId"] = git show-ref --hash origin/$baseRef
            echo "target branch: $baseRef"
            echo "source branch: $headRef"
            echo "target commit: $($ret.targetId)"
            echo "source commit: $($ret.sourceId)"
            echo "base commit:   $($ret.baseId)"
            return $ret
          }
          
          function downloadFileVersion($fileName, $commitId)
          {
            echo "Filename: $fileName@$commitId"
            #git fetch origin $commitId
            $pointer = git cat-file blob $commitId":"$fileName
            $sha = ($pointer[1] -split(":"))[1]
            echo "SHA: $sha"
            $shaPart1 = $sha.Substring(0,2)
            $shaPart2 = $sha.Substring(2,2)
            git cat-file --filters $commitId":"$fileName | Out-Null
            $targetFile = $fileName+"_"+$commitId
            copy ".git\lfs\objects\$shaPart1\$shaPart2\$sha" $targetFile
            echo "Version file: $targetFile"
          }
          
          function getSessionFileName($repoName, $prNumber, $sourceCommit, $targetCommit)
          {
            $filename = $repoName.Split('/')[1]+"-"+'PR'+"-"+$prNumber+"-"+$sourceCommit+"-"+$targetCommit+'.ltsfs'
            return $fileName
          }
          
          $prList = $env:jsVar | ConvertFrom-Json
          $messageList = [System.Collections.ArrayList]::new()
          $modelFileName = "${{env.ModelName}}.${{env.ModelExtension}}"
          foreach($pr in $prList)
          {
            echo "Processing PR $($pr.number)"
            $commitIds = getCommitIds $pr.base.ref $pr.head.ref
            $sessionFileName = getSessionFileName ${{ github.repository }} $pr.number $commitIds.sourceId $commitIds.targetId
            echo "Session filename: $sessionFileName"
            
            echo "Downloading base file"
            downloadFileVersion $modelFileName $commitIds.baseId
            echo "Downloading source file"
            downloadFileVersion $modelFileName $commitIds.sourceId
            echo "Downloading target file"
            downloadFileVersion $modelFileName $commitIds.targetId
            
            echo "Starting check for merge conflicts"
            
            $baseFile = $modelFileName +"_"+$commitIds.baseId
            $targetFile = $modelFileName +"_"+$commitIds.targetId
            $sourceFile = $modelFileName +"_"+$commitIds.sourceId
            $targetUrl = "${{env.ReviewSessionURL}}/$sessionFileName"
            
            &"${{steps.GetLTA.outputs.LemonTreeAutomationExecutable}}"`
              merge `
              --base $baseFile `
              --theirs $targetFile `
              --mine $sourceFile `
              --dryrun `
              --sfs $sessionFileName `
              --abortOnConflict true
            
            if($LASTEXITCODE -eq 0)
            {
              echo "No merge conflicts, update only on target branch. No new review session file required."
            }
            elseif($LASTEXITCODE -eq 2)
            {
              echo "Internal Error when diffing. Please report such errors to support@lieberlieber.com"
            }
            elseif($LASTEXITCODE -eq 3)
            {
              echo "Merge conflicts"
              echo "Uploading $sessionFileName to Nexus: $targetUrl"
              while (Test-Path Alias:curl) {Remove-Item Alias:curl} #remove the alias binding from curl to Invoke-WebRequest
              curl "-u${{secrets.NEXUSAUTHENTICATION}}" -T $sessionFileName $targetUrl
              $prMessage =@{}
              $prMessage.number=$pr.number
              $prMessage.message="New commit on target branch\n[Review Session file]($targetUrl)\n:x: **Please resolve merge conflicts in model first**\n\nInstall [LemonTree 3.3+](https://www.lieberlieber.com/lemontree/en/) to open the Review Session file."
              $messageList.Add($prMessage)
            }
            elseif($LASTEXITCODE -eq 6)
            {
              echo "Licensing issue of LemonTree.Automation"
            }
            else
            {
              echo "Unknown error, exit code: $LASTEXITCODE"
            }
          }
          $jsonResult = ConvertTo-Json -InputObject $messageList -Compress
          echo $jsonResult
          echo "result=$jsonResult" >> $env:GITHUB_OUTPUT
          
      - name: CreateComments
        if: ${{ steps.checkNumber.outputs.count > 0}}
        uses: actions/github-script@v6
        with:
          script: |
            const prList = JSON.parse(`${{steps.WorkOnPr.outputs.result}}`)
            for (const pr of prList)
            {
              console.log(`Updating PR#${pr.number}: ${pr.message}`)
              await github.rest.issues.createComment({
                issue_number: pr.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: pr.message
              })        
            }