(nexus-repository-migrator) Extracts nexus-repository Migration Logic

It was raised that we should have a separate package for the Nexus Repository Migrator logic.
This commit removes that code from the Nexus Repository package, and adds it to a separate package that can be installed.

automatic/nexus-repository-migrator/nexus-repository-migrator.nuspec

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+<?xml version="1.0" encoding="utf-8"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2015/06/nuspec.xsd">
+  <metadata>
+    <id>nexus-repository-migrator</id>
+    <title>Nexus Repository Migrator</title>
+    <version>3.70.1.3</version>
+    <authors>Sonatype</authors>
+    <owners>chocolatey-community, jpruskin</owners>
+    <summary>Migrator for the Sonatype Nexus Repository database.</summary>
+    <description><![CDATA[# Nexus Repository Migrator
+
+## Features
+
+In release 3.71.0, Sonatype Nexus Repository began using H2 as its default embedded database. This has made a lot of people very angry and been widely regarded as a bad move.
+OrientDB is now in Extended Maintenance as defined in our [Sunsetting documentation](https://help.sonatype.com/en/sonatype-sunsetting-information.html).
+Those wishing to upgrade to version 3.71.0 or above will need to migrate to either an H2 or PostgreSQL database.
+See our detailed [help topic on Upgrading to 3.71.0 and beyond](https://help.sonatype.com/en/upgrading-to-nexus-repository-3-71-0-and-beyond.html).
+
+This package contains the migrator tool to migrate a Sonatype Nexus Repository 3.70.1 database from OrientDb to H2 (available to all) or PostgreSQL (available to Pro license holders).
+
+You can either install the package and run the migrator by following the instructions in Notes, or run the script `ConvertFrom-NexusOrientDb` in the tools directory.
+
+If you have upgraded to the `nexus-repository` package version 3.71.0.6 and your installation is failing to run, you can run the `Repair-Nexus371FailedUpgrade` script in the tools directory.
+
+## Package Parameters
+
+This package supports the following parameters:
+
+* `/AttemptMigration` - Attempts to migrate your existing Sonatype Nexus install from OrientDb to a H2 database.
+
+You can pass parameters as follows:
+
+`choco install nexus-repository-migrator --parameters="/AttemptMigration"`
+
+## Notes
+
+**Please note that using the scripts contained within is entirely at the user's own risk. Read them before you run them!**
+
+For more details, including how to migrate to PostgreSQL, see the [Migrating To A New Database article](https://help.sonatype.com/en/migrating-to-a-new-database.html).
+
+### Migration Environment Prerequisite Requirements
+
+The checklist below covers requirements for a successful database migration:
+
+- If you are migrating from OrientDB to H2 or PostgreSQL, your OrientDB-based instance must be on the latest 3.70.x version.
+- You must have JRE 8 or JRE 11 available. The Chocolatey `nexus-repository` 3.70.1.6 package contains this already.
+- You must have at least 16GB RAM available.
+- You must have a database backup in a clean working location.
+- The migrator utility requires three times the disk space (minimum 10 GB) as your $data-dir/db directory.
+
+### Migrating From OrientDB to H2
+
+1. Perform a full backup using normal backup procedures.
+1. Copy the backup to a clean working location on a different filesystem so that any extraction doesn’t impact the existing production system.
+1. Shut down Nexus Repository.
+1. Run the following command from the clean working location containing your database backup. You may include any of the optional parameters listed in the section below when running this command.
+    `java -Xmx16G -Xms16G -XX:+UseG1GC -XX:MaxDirectMemorySize=28672M -jar nexus-db-migrator-*.jar --migration_type=h2`
+1. Copy the resultant nexus.mv.db file to your $data-dir/db directory.
+1. Edit the $data-dir/etc/nexus.properties file and add the following line: `nexus.datastore.enabled=true`
+1. Start Nexus Repository]]></description>
+    <projectUrl>https://help.sonatype.com/en/orientdb-downloads.html</projectUrl>
+    <projectSourceUrl>https://github.com/sonatype/nexus-public</projectSourceUrl>
+    <docsUrl>https://help.sonatype.com/en/migrating-to-a-new-database.html</docsUrl>
+    <tags>nexus-repository migration sonatype nexus</tags>
+    <copyright>Sonatype</copyright>
+    <licenseUrl>http://www.eclipse.org/legal/epl-v10.html</licenseUrl>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <iconUrl>https://cdn.jsdelivr.net/gh/chocolatey-community/chocolatey-packages@f459e946d7b1926ee89c2b415ec8507dffe99218/icons/nexus-repository.png</iconUrl>
+    <releaseNotes>https://help.sonatype.com/repomanager3/release-notes</releaseNotes>
+    <dependencies>
+      <!--dependency id="nexus-repository" version="3.70.1.2" /-->
+    </dependencies>
+  </metadata>
+  <files>
+    <file src="tools\**" target="tools" />
+    <file src="..\nexus-repository\tools\helpers.ps1" target="tools\nexus-helpers.ps1" />
+  </files>
+</package>

automatic/nexus-repository-migrator/tools/ConvertFrom-NexusOrientDb.ps1

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+<#
+  .Synopsis
+    Migrates Sonatype Nexus Repository 3.70.1-02 to the H2 database type
+
+  .Example
+    .\ConvertFrom-NexusOrientDb.ps1
+
+  .Example
+    .\ConvertFrom-NexusOrientDb.ps1 -JavaPath .\path\to\java.exe
+#>
+[CmdletBinding(SupportsShouldProcess)]
+param(
+  [string]$JavaPath,
+
+  [switch]$Force
+)
+
+Import-Module $PSScriptRoot\nexus-helpers.ps1 -Verbose:$false
+
+foreach ($Service in Get-NexusRepositoryServiceInstall) {
+  if ($Force -or (Test-NexusMigratorRequired -DataDir (Split-Path $Service.DataFolder) -ProgramDir $Service.ProgramFolder)) {
+    Write-Host "Preparing for database migration..."
+    $MigrationFiles = Join-Path $env:Temp "dbmigration-$($Service.ServiceName)"
+    $PreMigrationIssues = @()
+
+    if (Test-NexusMigratorFreeSpaceProblem -Drive $MigrationFiles.Split(':')[0] -DatabaseFolder (Join-Path $Service.DataFolder "db")) {
+      $PreMigrationIssues += "Cannot migrate database with available disk space"
+    }
+
+    if (Test-NexusMigratorMemoryProblem) {
+      $PreMigrationIssues += "Cannot migrate database with available memory"
+    }
+
+    # Test if contained JRE is compatible, otherwise check JAVA_HOME, otherwise...
+    $JavaPath = @(
+      $JavaPath
+      Join-Path $Service.ProgramFolder "\jre\bin\java.exe"
+      Convert-Path $env:JAVA_HOME\bin\java.exe
+      Convert-Path $env:ProgramFiles\*\jre-*\bin\java.exe
+    ) | Where-Object {
+      $_ -and
+      (Test-Path $_) -and
+      (([version](Get-ItemProperty -Path $_).VersionInfo.ProductVersion).Major -in 8, 11)
+    } | Select-Object -First 1
+
+    if (-not $JavaPath) {
+      $PreMigrationIssues += "Nexus Migrator requires JRE 8 or JRE 11. Please provide a -JavaPath to a compatible version."
+    }
+
+    # See: https://help.sonatype.com/en/orientdb-downloads.html
+    $MigratorDownload = @{
+      Url = 'https://download.sonatype.com/nexus/nxrm3-migrator/nexus-db-migrator-3.70.1-03.jar'
+      FileFullPath = Join-Path $PSScriptRoot "nexus-db-migrator.jar"
+      Checksum = "02ea88e88e7d5d7f9d8a1738c9c0363fde636fc22e295efddf9d0f5e7bed982a"
+      ChecksumType = "SHA256"
+    }
+    if (-not (Test-Path $MigratorDownload.FileFullPath)) {
+      $ProgressPreference, $CurrentProgressPreference = "SilentlyContinue", $ProgressPreference
+      try {
+        Invoke-WebRequest -Uri $MigratorDownload.Url -OutFile $MigratorDownload.FileFullPath -UseBasicParsing
+      } finally {
+        $ProgressPreference = $CurrentProgressPreference
+      }
+    }
+
+    $MigratorHash = Get-FileHash -Path $MigratorDownload.FileFullPath -Algorithm $MigratorDownload.ChecksumType
+    if ($MigratorHash.Hash -ne $MigratorDownload.Checksum) {
+      $PreMigrationIssues += "The hash of the downloaded file '$($MigratorDownload.Url | Split-Path -Leaf)' ('$($MigratorHash.Hash)') did not match the expected hash ('$($MigratorDownload.Checksum)')."
+    }
+
+    if ($PreMigrationIssues) {
+      Write-Error -Message ($PreMigrationIssues -join "`n") -ErrorAction Stop
+    }
+
+    $ServiceState = (Get-Service $Service.ServiceName).Status
+
+    New-NexusOrientDbBackup -DataDir (Split-Path $Service.DataFolder) -ServiceName $Service.ServiceName -DestinationPath $MigrationFiles
+
+    try {
+      Push-Location $MigrationFiles
+      Write-Host "Migrating database from 'OrientDb' to 'H2'"
+      # We could adjust the memory values to work on more systems,
+      # but these are the recommended arguments from Sonatype.
+      $JavaArgs = @(
+        "-Xmx16G"
+        "-Xms16G"
+        "-XX:+UseG1GC"
+        "-XX:MaxDirectMemorySize=28672M"
+        "-jar"
+        $MigratorDownload.FileFullPath
+        "--migration_type=h2"
+        "--yes"
+      )
+      & $JavaPath @JavaArgs
+
+      if ($LASTEXITCODE -ne 0) {
+        throw "Migration of the database failed."
+      }
+
+      if ($PSCmdlet.ShouldProcess("$MigrationFiles\nexus.mv.db", "Moving migrated database")) {
+        Copy-Item -Path $MigrationFiles\nexus.mv.db -Destination (Join-Path $Service.DataFolder "db")
+      }
+      $NexusConfigFile = Join-Path $Service.DataFolder "etc\nexus.properties"
+      if ((Get-NexusConfiguration -Path $NexusConfigFile).'nexus.datastore.enabled' -ne 'true' -and $PSCmdlet.ShouldProcess($NexusConfigFile, 'Updating Datastore Configuration')) {
+        (Get-Content $NexusConfigFile) | Where-Object {$_ -notmatch '^\W*nexus\.datastore\.enabled='} | Set-Content $NexusConfigFile
+        Add-Content -Path $NexusConfigFile -Value "nexus.datastore.enabled=true"
+      }
+
+      if ($ServiceState -eq 'Running') {
+        try {
+          Write-Host "Restarting '$($Service.ServiceName)'"
+          Restart-Service $Service.ServiceName
+          Wait-NexusAvailability -Hostname $Hostname -Config $NexusConfigFile -ErrorAction Stop
+        } catch {
+          Write-Error -Message (@(
+            "The Nexus service '$($Service.ServiceName)' was restarted, but did not recover."
+            "Check the logs at '$(Join-Path $Service.DataFolder "log")'"
+          ) -join "`n")
+        }
+      }
+    } finally {
+      Pop-Location
+      Remove-Item $MigrationFiles -Recurse
+    }
+  } else {
+    Write-Warning "'$($Service.DataFolder)' was not migrated"
+  }
+}

automatic/nexus-repository-migrator/tools/Repair-Nexus371FailedUpgrade.ps1

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+<#
+  .Synopsis
+    Repairs a broken upgrade of Sonatype Nexus Repository OSS
+  
+  .Example
+    .\Repair-Nexus371FailedUpgrade.ps1
+    # Repairs the Nexus install, ending with a migrated database and version 3.71.0.6
+
+  .Example
+    .\Repair-Nexus371FailedUpgrade.ps1 -Rollback
+    # Repairs the Nexus install, ending with an unmodified database and version 3.70.1.2
+#>
+[CmdletBinding(DefaultParameterSetName="Upgrade")]
+param(
+  # If selected, rolls the install back to 3.70.x instead of upgrading.
+  [Parameter(ParameterSetName="Repair")]
+  [Alias("Repair")]
+  [switch]$Rollback,
+
+  # Temporary Path for extracting files
+  [string]$ExtractPath = (Join-Path $env:Temp "nexus")
+)
+$ProgressPreference = "SilentlyContinue"
+$ErrorActionPreference = "Stop"
+
+Import-Module $PSScriptRoot\nexus-helpers.ps1 -Verbose:$false
+
+# Test if Nexus JRE matches
+$JavaPath = @(
+  Join-Path $env:ProgramData "\nexus\jre\bin\java.exe"
+  Convert-Path $env:JAVA_HOME\bin\java.exe
+  Convert-Path $env:ProgramFiles\*\jre-*\bin\java.exe
+) | Where-Object {
+  $_ -and
+  (Test-Path $_) -and
+  (([version](Get-ItemProperty -Path $_).VersionInfo.ProductVersion).Major -in 8, 11)
+} | Select-Object -First 1
+
+# Download Java if it's missing, via the old version of Nexus Repository
+if (-not $JavaPath -and -not ($JavaPath = Convert-Path "$ExtractPath\nexus-3.70.1-02\jre\bin\java.exe" -ErrorAction SilentlyContinue)) {
+  Invoke-WebRequest -Uri https://sonatype-download.global.ssl.fastly.net/repository/downloads-prod-group/3/nexus-3.70.1-02-win64.zip -OutFile "$env:Temp\nexus-3.70.1-02.zip"
+  Expand-Archive -Path "$env:Temp\nexus-3.70.1-02.zip" -DestinationPath $ExtractPath
+  $JavaPath = Convert-Path "$ExtractPath\nexus-3.70.1-02\jre\bin\java.exe"
+  Remove-Item "$env:Temp\nexus-3.70.1-02.zip"
+}
+
+$BackupLocation = "$PSScriptRoot\$(New-Guid)"
+Backup-NexusSSL -BackupLocation $BackupLocation
+
+# Get the "installed" and package version of Nexus
+$NexusVersion = Get-NexusVersion
+$null = [System.Reflection.Assembly]::LoadFrom("$env:ChocolateyInstall\choco.exe")
+$LatestPackageVersion = [Chocolatey.NugetVersionExtensions]::ToNormalizedStringChecked(
+  "$($NexusVersion -replace '-','.')"
+)
+
+if ((Get-Service nexus).Status -ne 'running') {
+  if ($PSCmdlet.ParameterSetName -eq 'Upgrade') {
+    & $PSScriptRoot\ConvertFrom-NexusOrientDb.ps1 -JavaPath $JavaPath -Force
+  }
+
+  # The combined installation of old and new Nexus Java versions and supports
+  # causes the install to become un-startable. We'll replace it.
+  Remove-Item $env:ProgramData\nexus -Recurse
+
+  switch ($PSCmdlet.ParameterSetName) {
+    "Repair" {
+      Copy-Item -Path "$ExtractPath\nexus-3.70.1-02\" -Destination "$env:ProgramData\nexus" -Recurse
+    }
+    "Upgrade" {
+      # Download the matching version of Nexus
+        Invoke-WebRequest -Uri https://sonatype-download.global.ssl.fastly.net/repository/downloads-prod-group/3/nexus-$($NexusVersion)-win64.zip -OutFile "$env:Temp\nexus-$($NexusVersion)-win64.zip"
+        Expand-Archive -Path "$env:Temp\nexus-$($NexusVersion)-win64.zip" -DestinationPath $ExtractPath -Force
+        Copy-Item -Path "$ExtractPath\nexus-$NexusVersion\" -Destination "$env:ProgramData\nexus" -Recurse
+        Remove-Item "$env:Temp\nexus-$($NexusVersion)-win64.zip"
+
+      # Ensure the package is in a good state, from CCR as we know the local repository isn't running.
+      choco upgrade nexus-repository --version $LatestPackageVersion --confirm --no-progress --source https://community.chocolatey.org/api/v2/ --skip-powershell
+    }
+  }
+} else {
+  Write-Warning "The service is already running. You don't need to repair."
+}
+
+try {
+  Restore-NexusSSL -BackupLocation $BackupLocation
+} finally {
+  Remove-Item $BackupLocation -Recurse
+}
+
+Restart-Service nexus

automatic/nexus-repository-migrator/tools/chocolateyInstall.ps1

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+$ErrorActionPreference = 'Stop'
+$toolsDir = Split-Path $MyInvocation.MyCommand.Definition
+$PackageParameters = Get-PackageParameters
+
+$MigratorDownload = @{
+  PackageName = $env:ChocolateyPackageName
+  Url = 'https://download.sonatype.com/nexus/nxrm3-migrator/nexus-db-migrator-3.70.1-03.jar'
+  FileFullPath = Join-Path $toolsDir "nexus-db-migrator.jar"
+  Checksum = '02ea88e88e7d5d7f9d8a1738c9c0363fde636fc22e295efddf9d0f5e7bed982a'
+  ChecksumType = 'SHA256'
+}
+Get-ChocolateyWebFile @MigratorDownload
+
+$PowerShellScript = @{
+  packageName = $env:ChocolateyPackageName
+  PsFileFullPath = Join-Path $toolsDir "ConvertFrom-NexusOrientDb.ps1"
+}
+Install-ChocolateyPowershellCommand @PowerShellScript
+
+if ($PackageParameters.AttemptMigration) {
+  & $toolsDir\ConvertFrom-NexusOrientDb.ps1 -ErrorAction Stop
+  Write-Host "You may now uninstall this package with 'choco uninstall $($env:ChocolateyPackageName) --confirm'."
+}

automatic/nexus-repository-migrator/tools/chocolateyUninstall.ps1

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+$ErrorActionPreference = 'Stop'
+$toolsDir = Split-Path $MyInvocation.MyCommand.Definition
+
+Uninstall-BinFile -Name "ConvertFrom-NexusOrientDb" -Path $toolsDir\ConvertFrom-NexusOrientDb.ps1

automatic/nexus-repository-migrator/update.ps1

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+Import-Module Chocolatey-AU
+
+function global:au_GetLatest {
+  $R = Invoke-WebRequest -Uri https://help.sonatype.com/en/orientdb-downloads.html -UseBasicParsing
+  $MigratorUrl = $R.Links.href | Where-Object {
+    $_ -like 'https://download.sonatype.com/nexus/nxrm3-migrator/nexus-db-migrator-3.70.*.jar'
+  }
+
+  if ($MigratorUrl.Count -ne 1) {
+    throw "Found $($MigratorUrl.Count) URLs that look like the migrator:`n  $($MigratorUrl -join "`n  ")"
+  }
+
+  if ($MigratorUrl -match "/nexus-db-migrator-(?<Version>3\.70\.\d+-\d+)\.jar$") {
+    $NexusMigratorVersion = $Matches.Version
+  }
+
+  $null = [System.Reflection.Assembly]::LoadFrom("$env:ChocolateyInstall\choco.exe")
+  $LatestPackageVersion = [Chocolatey.NugetVersionExtensions]::ToNormalizedStringChecked(
+    "$($NexusMigratorVersion -replace '-','.')"
+  )
+
+  @{
+    NexusVersion = $NexusMigratorVersion
+    Version      = $LatestPackageVersion
+    URL          = $MigratorUrl
+    SHA256       = (Invoke-RestMethod "$MigratorUrl.sha256" -UseBasicParsing).Trim()
+  }
+}
+
+function global:au_SearchReplace {
+  @{
+    ".\tools\chocolateyInstall.ps1" = @{
+      "(^\s*url\s*=\s*)('.*')"      = "`$1'$($Latest.URL)'"
+      "(^\s*checksum\s*=\s*)('.*')" = "`$1'$($Latest.SHA256)'"
+    }
+  }
+}
+
+update -ChecksumFor none