Get-TFVersionFromFile.ps1
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<#
.SYNOPSIS Get Terraform version from ".terraform-version" file. This function is mainly for internal use. #> function Get-TFVersionFromFile { [CmdletBinding(DefaultParameterSetName = 'Default')] param ( [Parameter(ParameterSetName = 'Default', Mandatory = $false)] [string]$LiteralPath = './.terraform-version' ) if ([string]::IsNullOrEmpty($LiteralPath)) { $LiteralPath = './.terraform-version' } # Test path if (-not (Test-Path -LiteralPath $LiteralPath)) { Write-Warning ('{0} not found.' -f $LiteralPath) return } $rowString = @(Get-Content -LiteralPath $LiteralPath)[0].Trim() if ('latest-allowed' -eq $rowString) { $requiredValue = GetTerraformRequiredValue -RootPath $($pwd.Path) if ([string]::IsNullOrEmpty($requiredValue)) { Write-Warning '.terraform-version contains "latest-allowed", but "required_version" statement not found.' return } $arrowedVersion = ParseTerraformRequiredVersion -RawString $requiredValue if (-not $arrowedVersion) { Write-Warning '.terraform-version contains "latest-allowed", but failed to parse "required_version" statement.' return } return $arrowedVersion.AllowedMaxVersion } if ('min-required' -eq $rowString) { $requiredValue = GetTerraformRequiredValue -RootPath $($pwd.Path) if ([string]::IsNullOrEmpty($requiredValue)) { Write-Warning '.terraform-version contains "min-required", but "required_version" statement not found.' return } $arrowedVersion = ParseTerraformRequiredVersion -RawString $requiredValue if (-not $arrowedVersion) { Write-Warning '.terraform-version contains "min-required", but failed to parse "required_version" statement.' return } return $arrowedVersion.AllowedMinVersion } if ('latest' -eq $rowString) { Write-Verbose 'Detect the latest version' return (Find-TFRelease -Latest).Version } if ($rowString -match '^latest:(?<match_exp>.+)$' ) { $matchExp = $Matches.match_exp Write-Verbose ("version match expression : {0}" -f $matchExp) $matchVersion = Find-TFVersion -Filter { "$_" -match $matchExp } -Take 1 if (-not $matchVersion) { Write-Warning ('Failed to detect Terraform version. (expression = {0})' -f $matchExp) return } Write-Verbose ('Detect version {0}' -f $matchVersion) return $matchVersion } try { $version = [semver]$rowString Write-Verbose ('Detect version {0}' -f $version) return $version } catch { # do nothing } Write-Warning ('Failed to parse .terraform-version : {0}' -f $rowString) } # TODO : implement more formal parser function GetTerraformRequiredValue ([string]$RootPath) { if (-not (Test-Path -Path $RootPath -PathType Container)) { return "" } foreach ($file in (Get-ChildItem -LiteralPath $RootPath -Include '*.tf', '*.tf.json')) { Select-String -LiteralPath $file.FullName -Pattern '^\s*[^#]*\s*required_version\s*=\s*["''](?<match_exp>.+)["'']$' | ForEach-Object { $rawString = ($_.Matches.Groups).Where({ $_.Name -eq 'match_exp' }).Value if ($rawString) { Write-Verbose ('Found rawString : {0}' -f $rawString) return $rawString } } } } # TODO : implement more formal parser function ParseTerraformRequiredVersion ([string]$RawString) { $allVersions = Find-TFVersion # Get each expressions $expressions = foreach ($str in $RawString -split ',') { $str = $str.Trim() switch -Regex ($str) { '^\s*(?<match_op>(=|>=|<=|~>|<|>))\s*(?<match_ver>.+)$' { # Value must be string to validate ~> operator switch ($Matches.match_op) { '=' { [PSCustomObject]@{ Operator = ($Matches.match_op) Value = ($Matches.match_ver) MinVersion = [semver]($Matches.match_ver) MaxVersion = [semver]($Matches.match_ver) } break } '>=' { [PSCustomObject]@{ Operator = ($Matches.match_op) Value = ($Matches.match_ver) MinVersion = [semver]($Matches.match_ver) MaxVersion = $allVersions[0] } break } '<=' { [PSCustomObject]@{ Operator = ($Matches.match_op) Value = ($Matches.match_ver) MinVersion = [semver]$allVersions[-1] MaxVersion = [semver]($Matches.match_ver) } break } '~>' { $v = $Matches.match_ver.Substring(0, $Matches.match_ver.LastIndexOf('.')) $tempVersions = $allVersions.Where( { $_ -ge "$($Matches.match_ver)" -and $_ -like "${v}.*" } ) [PSCustomObject]@{ Operator = ($Matches.match_op) Value = ($Matches.match_ver) MinVersion = [semver]($tempVersions[-1]) MaxVersion = [semver]($tempVersions[0]) } break } '<' { $tempVersions = $allVersions.Where( { $_ -lt "$($Matches.match_ver)" } ) [PSCustomObject]@{ Operator = ($Matches.match_op) Value = ($Matches.match_ver) MinVersion = [semver]$allVersions[-1] MaxVersion = [semver]$tempVersions[0] } break } '>' { $tempVersions = $allVersions.Where( { $_ -gt "$($Matches.match_ver)" } ) [PSCustomObject]@{ Operator = ($Matches.match_op) Value = ($Matches.match_ver) MinVersion = [semver]$tempVersions[-1] MaxVersion = [semver]$allVersions[0] } break } } break } Default { # No matched : treat as "=" try { # Value must be string to validate ~> operator $tempVer = [semver]($str) [PSCustomObject]@{ Operator = '=' Value = $str MinVersion = $tempVer MaxVersion = $tempVer } } catch { Write-Warning $_ } break } } } # Simply "AND" all expressions $minVer = ($expressions.MinVersion | Measure-Object -Maximum).Maximum $maxVer = ($expressions.MaxVersion | Measure-Object -Minimum).Minimum if ($minVer -gt $maxVer) { Write-Warning ('"required_version" has inconsistent expression "{0}". (Min={1}, Max={2})' -f $RawString, $minVer, $maxVer) return } return [PSCustomObject]@{ AllowedMinVersion = $minVer AllowedMaxVersion = $maxVer } } |