Avm.Authoring

0.3.0

Private/Assets/Resolve-AvmPinnedAsset.ps1

                                function Resolve-AvmPinnedAsset {

    <#

    .SYNOPSIS

        Materialise a single pinned asset descriptor into the per-user cache.

    .DESCRIPTION

        Given an asset descriptor (the shape Resolve-AvmPolicyBundle projects from the pin manifest

        returns) plus its asset Name, ensures the referenced archive is

        downloaded, SHA-verified, extracted, and available under

            <Get-AvmFolder Cache>/assets/<name>/<sha256-prefix12>/

        The 12-hex prefix (first 12 chars of the lowercase SHA256) keeps cache

        paths short on Windows per spec section 6 (260-char budget). The full

        64-char SHA is still pinned by the descriptor, verified by Invoke-AvmHttp,

        and preserved in .meta.json -- only the on-disk directory name is truncated.

        The install pipeline mirrors Install-AvmToolFromPins: cache-hit

        short-circuit -> cross-process lock -> stage under .staging/<uuid>/

        -> Invoke-AvmHttp (download + SHA verify) -> Expand-AvmToolArchive

        -> optional Path subdir verification -> atomic Move-Item to final

        dir -> .meta.json + .verified marker -> unlock.

        Archive type is inferred from the source URL extension:

            *.zip                  -> zip

            *.tar.gz | *.tgz       -> tar.gz

        This slice (2/2 of the pinned-asset feature) only supports

        sha256-pinned archives. Ref-only assets and type=git assets throw

        AvmConfigurationException so callers see a clean "not yet

        supported" message; both are tracked for follow-up slices.

    .PARAMETER Name

        The asset name. Used for the cache subdirectory and diagnostics.

    .PARAMETER Asset

        The pscustomobject descriptor built by the caller (see Resolve-AvmPolicyBundle).

        Required properties: Source. Conditionally required: Sha256.

        Optional: Ref, Path, Type.

    .PARAMETER AllowFileUrls

        Forwarded to Invoke-AvmHttp. Permits file:// sources for fixtures.

    .PARAMETER Force

        If set, blow away any cached materialisation and re-install.

    .OUTPUTS

        [pscustomobject] with members:

            Name     : asset name

            Sha256   : the cache key

            Ref      : descriptor Ref (may be $null)

            Path     : absolute on-disk root of the materialised asset.

                       If the descriptor specifies a sub-Path, that subdir

                       is appended.

            Action   : 'cache-hit' | 'installed' | 'race-loss'

    #>

    [CmdletBinding(SupportsShouldProcess)]

    [OutputType([pscustomobject])]

    param(

        [Parameter(Mandatory)]

        [string] $Name,

        [Parameter(Mandatory)]

        [pscustomobject] $Asset,

        [switch] $AllowFileUrls,

        [switch] $Force

    )

    Set-StrictMode -Version 3.0

    $ErrorActionPreference = 'Stop'

    if ([string]::IsNullOrWhiteSpace($Name)) {

        throw [System.ArgumentException]::new(

            'Resolve-AvmPinnedAsset: Name must be a non-empty string.', 'Name')

    }

    $source = if ($Asset.PSObject.Properties['Source']) { [string]$Asset.Source } else { $null }

    if ([string]::IsNullOrWhiteSpace($source)) {

        throw [AvmConfigurationException]::new(

            "Resolve-AvmPinnedAsset: asset '$Name' is missing 'Source'.",

            'AVM1004')

    }

    $type = if ($Asset.PSObject.Properties['Type']) { [string]$Asset.Type } else { $null }

    if ($type -eq 'git') {

        throw [AvmConfigurationException]::new(

            "Resolve-AvmPinnedAsset: asset '$Name' uses type='git'; only archive assets are supported in this slice (slice 2/2 of the pinned-asset feature).",

            'AVM1004')

    }

    $sha = if ($Asset.PSObject.Properties['Sha256']) { [string]$Asset.Sha256 } else { $null }

    if ([string]::IsNullOrWhiteSpace($sha)) {

        throw [AvmConfigurationException]::new(

            "Resolve-AvmPinnedAsset: asset '$Name' has no 'Sha256'. Ref-only materialisation is not yet supported; pin a sha256 (slice 2/2 of the pinned-asset feature).",

            'AVM1004')

    }

    if ($sha -cnotmatch '^[0-9a-f]{64}$') {

        throw [AvmConfigurationException]::new(

            "Resolve-AvmPinnedAsset: asset '$Name' Sha256 must be 64-char lowercase hex.",

            'AVM1004')

    }

    $archiveKind = $null

    $extSuffix = $null

    $lower = $source.ToLowerInvariant()

    if ($lower.EndsWith('.zip')) {

        $archiveKind = 'zip'

        $extSuffix = '.zip'

    }

    elseif ($lower.EndsWith('.tar.gz')) {

        $archiveKind = 'tar.gz'

        $extSuffix = '.tar.gz'

    }

    elseif ($lower.EndsWith('.tgz')) {

        $archiveKind = 'tar.gz'

        $extSuffix = '.tgz'

    }

    else {

        throw [AvmConfigurationException]::new(

            "Resolve-AvmPinnedAsset: asset '$Name' source URL '$source' has an unsupported archive extension; expected .zip, .tar.gz, or .tgz.",

            'AVM1004')

    }

    $ref = if ($Asset.PSObject.Properties['Ref']) { [string]$Asset.Ref } else { $null }

    $subPath = if ($Asset.PSObject.Properties['Path']) { [string]$Asset.Path } else { $null }

    $cacheRoot = Get-AvmFolder -Kind Cache

    $assetsRoot = Join-Path $cacheRoot 'assets'

    $assetDir = Join-Path $assetsRoot $Name

    # Spec section 6 line 220: use a 12-hex prefix of the SHA256 as the content-addressed

    # segment, not the full 64-char hash. Keeps Windows paths within budget; the

    # full SHA is still validated by Invoke-AvmHttp and recorded in .meta.json.

    $shaPrefix = $sha.Substring(0, 12)

    $versionDir = Join-Path $assetDir $shaPrefix

    $verified = Join-Path $versionDir '.verified'

    $resolvedPath = if ([string]::IsNullOrWhiteSpace($subPath)) { $versionDir } else { Join-Path $versionDir $subPath }

    if ((Test-Path -LiteralPath $verified) -and (Test-Path -LiteralPath $resolvedPath) -and -not $Force) {

        return [pscustomobject][ordered]@{

            Name   = $Name

            Sha256 = $sha

            Ref    = $ref

            Path   = $resolvedPath

            Action = 'cache-hit'

        }

    }

    if (-not $PSCmdlet.ShouldProcess($versionDir, "Resolve pinned asset '$Name'")) {

        return $null

    }

    if ($Force -and (Test-Path -LiteralPath $versionDir)) {

        Remove-Item -LiteralPath $versionDir -Recurse -Force

    }

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

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

    }

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

    $lock = Lock-AvmToolCache -LockFile $lockFile

    try {

        if ((Test-Path -LiteralPath $verified) -and (Test-Path -LiteralPath $resolvedPath) -and -not $Force) {

            return [pscustomobject][ordered]@{

                Name   = $Name

                Sha256 = $sha

                Ref    = $ref

                Path   = $resolvedPath

                Action = 'cache-hit'

            }

        }

        $stagingRoot = Join-Path $assetDir '.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 {

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

            $httpParams = @{

                Url            = $source

                Destination    = $archivePath

                ExpectedSha256 = $sha

            }

            if ($AllowFileUrls -and $source.StartsWith('file://')) {

                # Invoke-AvmHttp accepts file:// natively; no extra flag needed,

                # but we still gate it via -AllowFileUrls on this function so

                # callers must opt in explicitly (matches Test-AvmPins).

            }

            elseif ($source.StartsWith('file://') -and -not $AllowFileUrls) {

                throw [AvmConfigurationException]::new(

                    "Resolve-AvmPinnedAsset: asset '$Name' uses file:// source; pass -AllowFileUrls to permit it.",

                    'AVM1004')

            }

            Invoke-AvmHttp @httpParams | Out-Null

            Expand-AvmToolArchive -ArchivePath $archivePath -Archive $archiveKind -TargetDir $stagingDir -EntrypointBasename $Name

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

            if (-not [string]::IsNullOrWhiteSpace($subPath)) {

                $stagedSub = Join-Path $stagingDir $subPath

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

                    throw [AvmConfigurationException]::new(

                        "Resolve-AvmPinnedAsset: asset '$Name' declared Path '$subPath' but it does not exist after extraction.",

                        'AVM1004')

                }

            }

            $meta = [pscustomobject][ordered]@{

                name        = $Name

                source      = $source

                sha256      = $sha

                ref         = $ref

                path        = $subPath

                archive     = $archiveKind

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

            }

            $metaPath = Join-Path $stagingDir '.meta.json'

            $meta | ConvertTo-Json -Depth 5 | Set-Content -LiteralPath $metaPath -Encoding utf8

            try {

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

            }

            catch [System.IO.IOException] {

                if (Test-Path -LiteralPath $verified) {

                    Remove-Item -LiteralPath $stagingDir -Recurse -Force -ErrorAction SilentlyContinue

                    return [pscustomobject][ordered]@{

                        Name   = $Name

                        Sha256 = $sha

                        Ref    = $ref

                        Path   = $resolvedPath

                        Action = 'race-loss'

                    }

                }

                throw

            }

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

            return [pscustomobject][ordered]@{

                Name   = $Name

                Sha256 = $sha

                Ref    = $ref

                Path   = $resolvedPath

                Action = 'installed'

            }

        }

        finally {

            if (Test-Path -LiteralPath $stagingDir) {

                Remove-Item -LiteralPath $stagingDir -Recurse -Force -ErrorAction SilentlyContinue

            }

        }

    }

    finally {

        $lock.Dispose()

    }

}

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