Hephaestus.psm1
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Set-StrictMode -Version Latest $ErrorActionPreference = 'Stop' $script:HDTModuleRoot = $PSScriptRoot # THE DEFAULT CONSOLE WINDOW SIZE, AND THE FLOOR UNDER A REMEMBERED ONE. They are # here rather than in either command because the reader and the writer must agree # about them, and because they have to match UI\Console\HDTConsole.xaml's Height, # Width, MinHeight and MinWidth - a test asserts that they do. # # 1800 x 900 was measured, not chosen: the boot image pane is seventeen fields # including two 64-character hashes, it wants 866 units of height to show all of # it at once, and 1800 is what puts a full SHA-256 on one line beside its caption. $script:HDTConsoleDefaultWidth = 1800 $script:HDTConsoleDefaultHeight = 900 $script:HDTConsoleMinimumWidth = 900 $script:HDTConsoleMinimumHeight = 520 # THE SAME FOUR NUMBERS FOR THE TASK SEQUENCE EDITOR, and they must match # UI\Console\HDTSequenceEditor.xaml's Height, Width, MinHeight and MinWidth for # the same reason - a test asserts that too. # # THE EDITOR NORMALLY IGNORES THESE, because it opens at the size of the console # it was double-clicked in. They are what Resolve-HDTConsoleEditorSize answers # with when there is no console: Show-HDTSequenceEditor is a command, and it can # be run on a share with no window open anywhere. $script:HDTConsoleEditorDefaultWidth = 1180 $script:HDTConsoleEditorDefaultHeight = 760 $script:HDTConsoleEditorMinimumWidth = 820 $script:HDTConsoleEditorMinimumHeight = 480 $privateFile = @(Get-ChildItem -Path (Join-Path -Path $PSScriptRoot -ChildPath 'Private') -Filter '*.ps1' -Recurse -ErrorAction SilentlyContinue) $publicFile = @(Get-ChildItem -Path (Join-Path -Path $PSScriptRoot -ChildPath 'Public') -Filter '*.ps1' -Recurse -ErrorAction SilentlyContinue) # ONE FILE IF THERE IS ONE, 363 IF THERE IS NOT. # # Dot-sourcing the sources costs 2.46 seconds on the lab host: PowerShell parses # 2.6 MB of script - comment-based help included - and pays the per-file cost # every time. The same code concatenated parses in 1.37. That second is what # somebody watches nothing happen for after Start-HDTConsole -Detach, which # starts a fresh powershell.exe and imports this module cold before it can draw. # # THE BUNDLE IS GENERATED AND NEVER COMMITTED. Write-HDTModuleBundle writes it; # ./build.ps1 -Task bundle is what runs that. # # AND A STALE ONE IS NEVER USED. If any source is newer than the bundle, the # bundle is ignored and the files are dot-sourced - so editing a file is always # what runs, whether or not anybody remembered to rebuild. Enumerating the # sources costs 11ms and has already happened above, so the check is free. $bundlePath = Join-Path -Path $PSScriptRoot -ChildPath 'Hephaestus.bundle.ps1' $bundle = $null if (Test-Path -LiteralPath $bundlePath) { $candidate = Get-Item -LiteralPath $bundlePath $newest = @(@($privateFile + $publicFile) | Sort-Object -Property LastWriteTimeUtc -Descending) if (@($newest).Count -eq 0 -or $candidate.LastWriteTimeUtc -ge $newest[0].LastWriteTimeUtc) { $bundle = $candidate } } if ($null -ne $bundle) { try { . $bundle.FullName } catch { throw ("Failed to dot-source '{0}': {1}. Delete it and import again - it is a generated file, and the module loads from its sources without it." -f $bundle.FullName, $_.Exception.Message) } } else { foreach ($file in @($privateFile + $publicFile)) { try { . $file.FullName } catch { throw ("Failed to dot-source '{0}': {1}" -f $file.FullName, $_.Exception.Message) } } } # Enumerate with ForEach-Object rather than member enumeration: an empty array's # .BaseName behaves differently between engines under Set-StrictMode -Version Latest. $exportName = @($publicFile | ForEach-Object { $_.BaseName }) # A MODULE THAT SHIPS AS A BUNDLE AND NOTHING ELSE HAS NO Public\ TO ENUMERATE. # # That is what goes into a boot image and, from there, onto the disk of every # machine HDT deploys: one file instead of several hundred, read once and copied # twice. Without this line such a module loads every function and exports NONE of # them - an import with no error, and CommandNotFound for everything, on a # machine halfway through a deployment with nobody watching. # # THE BUNDLE CARRIES ITS OWN LIST (Write-HDTModuleBundle writes it), because the # names are known at the moment it is built. Reading the manifest here instead # would put Import-PowerShellDataFile on the path every WinPE import takes. # Get-Variable, not $script:HDTBundleExport: under Set-StrictMode -Version Latest # naming a variable that was never assigned is an error, and a module loaded from # its sources never assigns this one. $bundleExport = Get-Variable -Name 'HDTBundleExport' -Scope Script -ValueOnly -ErrorAction SilentlyContinue if (@($exportName).Count -eq 0 -and $null -ne $bundle -and $null -ne $bundleExport) { $exportName = @($bundleExport) } Export-ModuleMember -Function $exportName |