Avm.Authoring

0.26.0

Private/Tools/Install-AvmToolFromPins.ps1

                                function Install-AvmToolFromPins {

    <#

    .SYNOPSIS

        Install a single tool entry from a parsed avm.pins into the cache.

    .DESCRIPTION

        Internal worker invoked by the public Install-AvmTool. Performs the

        full install pipeline for one (tool, platform) pair:

            1. Resolve cache target '<Data>/tools/<name>/<version>/'.

            2. If '.verified' marker exists and -Force not set, return path.

            3. Acquire cross-process lock under '<Data>/tools/<name>/.lock'.

            4. Re-check '.verified' (another process may have raced ahead).

            5. Stage download into '<Data>/tools/<name>/.staging/<uuid>/'.

            6. Verify SHA256 (in Invoke-AvmHttp).

            7. Expand archive into the staging dir.

            8. Move-Item staging dir to final '<version>/' (atomic rename).

               If the rename loses a race, discard staging and use the

               existing dir.

            9. Write .meta.json and touch .verified marker.

           10. Release lock; return final path.

    #>

    [CmdletBinding()]

    [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSUseSingularNouns', '',

        Justification = 'Noun mirrors the avm.pins.jsonc manifest, which holds many pins.')]

    [OutputType([pscustomobject])]

    param(

        [Parameter(Mandatory)] [hashtable] $Tool,

        [Parameter(Mandatory)] [string] $Platform,

        [switch] $Force

    )

    Set-StrictMode -Version 3.0

    $ErrorActionPreference = 'Stop'

    if ($Tool.ContainsKey('unsupportedPlatforms') -and (@($Tool.unsupportedPlatforms) -ccontains $Platform)) {

        throw [AvmToolException]::new(

            "Tool '$($Tool.name)' does not ship a release for '$Platform'.",

            'AVM1012')

    }

    $overridden = $Tool.ContainsKey('versionOverride')

    if (-not $overridden -and -not $Tool.sha256.ContainsKey($Platform)) {

        throw [AvmToolException]::new(

            "Tool '$($Tool.name)' has no sha256 entry for platform '$Platform'.",

            'AVM1012')

    }

    $cache = Get-AvmToolCacheEntry -Tool $Tool -Platform $Platform

    $versionDir = $cache.Directory

    $toolDir = Split-Path -Path $versionDir -Parent

    $verified = $cache.Marker

    $entrypointPath = $cache.Path

    $entrypointName = Split-Path -Path $entrypointPath -Leaf

    $isModule = $Tool.ContainsKey('kind') -and $Tool.kind -ceq 'powershell-module'

    Write-AvmLog ("install: target directory = {0}" -f $versionDir) -Level Verbose | Out-Null

    if ($cache.Cached -and -not $Force) {

        Write-AvmLog ("install: cache hit for {0}/{1}" -f $Tool.name, $Tool.version) -Level Verbose | Out-Null

        return [pscustomobject]@{

            Name     = $Tool.name

            Version  = $Tool.version

            Platform = $Platform

            Path     = $entrypointPath

            Action   = 'cache-hit'

        }

    }

    if (-not (Test-Path -LiteralPath $toolDir)) {

        New-Item -ItemType Directory -Path $toolDir -Force | Out-Null

    }

    $lockFile = Join-Path $toolDir '.lock'

    Write-AvmLog ("install: acquiring cache lock {0}" -f $lockFile) -Level Verbose | Out-Null

    $lock = Lock-AvmToolCache -LockFile $lockFile

    try {

        if ((Get-AvmToolCacheEntry -Tool $Tool -Platform $Platform).Cached -and -not $Force) {

            Write-AvmLog ("install: post-lock cache hit for {0}/{1}" -f $Tool.name, $Tool.version) -Level Verbose | Out-Null

            return [pscustomobject]@{

                Name     = $Tool.name

                Version  = $Tool.version

                Platform = $Platform

                Path     = $entrypointPath

                Action   = 'cache-hit'

            }

        }

        $osPart, $archPart = $Platform.Split('-', 2)

        $url = $Tool.urlTemplate

        $url = $url.Replace('{version}', $Tool.version)

        $url = $url.Replace('{os}', $osPart)

        $url = $url.Replace('{arch}', $archPart)

        if ($Tool.ContainsKey('platformAliases')) {

            $alias = [string]$Tool.platformAliases[$Platform]

            $url = $url.Replace('{platform}', $alias)

        }

        $resolvedArchive = $Tool.archive

        if ($Tool.ContainsKey('archives') -and $Tool.archives.ContainsKey($Platform)) {

            $resolvedArchive = [string]$Tool.archives[$Platform]

        }

        $extToken = switch ($resolvedArchive) {

            'zip' { '.zip' }

            'tar.gz' { '.tar.gz' }

            'raw' { '' }

        }

        $url = $url.Replace('{ext}', $extToken)

        Write-AvmLog ("install: source = {0}" -f $url) -Level Verbose | Out-Null

        $expectedSha256 = if ($overridden) { $null } else { $Tool.sha256[$Platform] }

        Write-AvmLog ("install: archive = {0}; expected sha256 = {1}" -f $resolvedArchive, ($expectedSha256 ?? 'disabled by tool-version-overrides.json')) -Level Verbose | Out-Null

        $stagingRoot = Join-Path $toolDir '.staging'

        if (-not (Test-Path -LiteralPath $stagingRoot)) {

            New-Item -ItemType Directory -Path $stagingRoot -Force | Out-Null

        }

        $stagingDir = Join-Path $stagingRoot ([Guid]::NewGuid().ToString('N').Substring(0, 12))

        New-Item -ItemType Directory -Path $stagingDir -Force | Out-Null

        try {

            $archiveSuffix = $extToken

            $archivePath = Join-Path $stagingDir ("download" + $archiveSuffix)

            Write-AvmLog ("install: downloading to {0}" -f $archivePath) -Level Verbose | Out-Null

            $download = @{ Url = $url; Destination = $archivePath }

            if (-not $overridden) { $download.ExpectedSha256 = $expectedSha256 }

            else { $download.UnverifiedToolVersionOverride = $true }

            Invoke-AvmHttp @download | Out-Null

            Write-AvmLog ("install: expanding {0}" -f $resolvedArchive) -Level Verbose | Out-Null

            Expand-AvmToolArchive -ArchivePath $archivePath -Archive $resolvedArchive -TargetDir $stagingDir -EntrypointBasename $Tool.entrypoint

            Remove-Item -LiteralPath $archivePath -Force -ErrorAction SilentlyContinue

            $stagedEntrypoint = Join-Path $stagingDir $entrypointName

            if (-not (Test-Path -LiteralPath $stagedEntrypoint)) {

                throw [AvmToolException]::new(

                    "Expected entrypoint '$entrypointName' missing after extracting $($Tool.name) $($Tool.version) for $Platform.",

                    'AVM1013')

            }

            if ($isModule) {

                $manifest = Import-PowerShellDataFile -LiteralPath $stagedEntrypoint -ErrorAction Stop

                if ([version]$manifest.ModuleVersion -ne [version]$Tool.version) {

                    throw [AvmToolException]::new("Downloaded module '$($Tool.name)' does not declare version $($Tool.version).", 'AVM1013')

                }

            }

            $meta = [pscustomobject]@{

                name             = $Tool.name

                version          = $Tool.version

                platform         = $Platform

                url              = $url

                sha256           = $expectedSha256

                checksumVerified = -not $overridden

                urlTemplate      = $Tool.urlTemplate

                archive          = $resolvedArchive

                installedAt      = [DateTime]::UtcNow.ToString('o')

            }

            $meta | ConvertTo-Json -Depth 5 | Set-Content -LiteralPath (Join-Path $stagingDir '.meta.json') -Encoding utf8

            try {

                if (Test-Path -LiteralPath $versionDir) {

                    Remove-Item -LiteralPath $versionDir -Recurse -Force -ProgressAction SilentlyContinue

                }

                Move-Item -LiteralPath $stagingDir -Destination $versionDir -Force

            }

            catch [System.IO.IOException] {

                if ((Get-AvmToolCacheEntry -Tool $Tool -Platform $Platform).Cached) {

                    Write-AvmLog ("install: rename race lost for {0}/{1}; using completed cache entry" -f $Tool.name, $Tool.version) -Level Verbose | Out-Null

                    Remove-Item `

                        -LiteralPath $stagingDir `

                        -Recurse `

                        -Force `

                        -ErrorAction SilentlyContinue `

                        -ProgressAction SilentlyContinue

                    return [pscustomobject]@{

                        Name     = $Tool.name

                        Version  = $Tool.version

                        Platform = $Platform

                        Path     = $entrypointPath

                        Action   = 'race-loss'

                    }

                }

                throw

            }

            New-Item -ItemType File -Path $verified -Force | Out-Null

            Write-AvmLog ("install: verified marker written to {0}" -f $verified) -Level Verbose | Out-Null

            return [pscustomobject]@{

                Name     = $Tool.name

                Version  = $Tool.version

                Platform = $Platform

                Path     = $entrypointPath

                Action   = 'installed'

            }

        }

        finally {

            if (Test-Path -LiteralPath $stagingDir) {

                Remove-Item `

                    -LiteralPath $stagingDir `

                    -Recurse `

                    -Force `

                    -ErrorAction SilentlyContinue `

                    -ProgressAction SilentlyContinue

            }

        }

    }

    finally {

        $lock.Dispose()

    }

}

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