mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-10-24 12:49:03 -05:00
Abdessamad Derraz
392aacb207
On Windows the partial copy of a file of 16 MB or more is locked with msvcrt.locking, a LockFile region: the locking process cannot access that region through a second handle (Microsoft LockFile remarks). Hashing reopened the path, the read failed with a sharing violation, and every large file was reported as 'folder not writable' (issue 82). Both digests are now read in one pass through the handle that holds the lock. A read-only file already at the destination had the same misleading report: on Windows its attribute is now cleared before the verified copy replaces it, and a refusal that remains is named for what it is.
97 lines
4.6 KiB
PowerShell
97 lines
4.6 KiB
PowerShell
# One-line bootstrap and local wrapper. The downloaded installer is accepted
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# only when it matches the SHA-256 embedded in this wrapper.
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[CmdletBinding()]
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param(
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[Parameter(ValueFromRemainingArguments = $true)]
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[string[]]$InstallerArguments
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)
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$ErrorActionPreference = "Stop"
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$defaultInstallUrl = "https://raw.githubusercontent.com/Abdess/retrobios/main/install.py"
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$defaultInstallSha256 = "22737fbb470a63a8d3630f52ffee1535e57f96a2f1fea969e58368e06ca35f06"
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$maximumInstallerBytes = 2MB
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$installerExit = 0
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$installer = if ($PSScriptRoot) { Join-Path $PSScriptRoot "install.py" } else { $null }
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$temporary = $null
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try {
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if (-not $installer -or -not (Test-Path -LiteralPath $installer -PathType Leaf)) {
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$url = if ($env:RETROBIOS_INSTALL_URL) { $env:RETROBIOS_INSTALL_URL } else { $defaultInstallUrl }
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$expected = if ($env:RETROBIOS_INSTALL_SHA256) { $env:RETROBIOS_INSTALL_SHA256 } else { $defaultInstallSha256 }
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$uri = [Uri]$url
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if ($uri.Scheme -ne "https") {
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throw "RETROBIOS_INSTALL_URL must use HTTPS."
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}
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if ($expected -notmatch '^[0-9a-fA-F]{64}$') {
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throw "Installer SHA-256 must contain exactly 64 hexadecimal characters."
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}
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# Windows PowerShell 5.1 still negotiates SSL 3.0 / TLS 1.0 by default
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# and GitHub refuses both, so the download fails before any hash is
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# checked. install.sh pins the same floor with curl --tlsv1.2.
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if ($PSVersionTable.PSEdition -ne "Core") {
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[Net.ServicePointManager]::SecurityProtocol = `
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[Net.ServicePointManager]::SecurityProtocol -bor [Net.SecurityProtocolType]::Tls12
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}
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$temporary = Join-Path ([IO.Path]::GetTempPath()) ("retrobios-install-{0}.py" -f [Guid]::NewGuid())
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try {
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Invoke-WebRequest -Uri $uri -OutFile $temporary -UseBasicParsing
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} catch {
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# The raw WebException read as a crash and named no next step.
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throw ("The installer could not be downloaded from {0}: {1} " +
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"Check the network connection and any proxy, then run the same command again. " +
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"Nothing was run and nothing was written.") -f $url, $_.Exception.Message
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}
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if ((Get-Item -LiteralPath $temporary).Length -gt $maximumInstallerBytes) {
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throw "Downloaded installer exceeds the size limit."
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}
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$actual = (Get-FileHash -LiteralPath $temporary -Algorithm SHA256).Hash.ToLowerInvariant()
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if ($actual -ne $expected.ToLowerInvariant()) {
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throw "The downloaded installer does not match its expected fingerprint. Nothing was run and nothing was written. The download was most likely cut short: try again. Within minutes of an update of this project the two files can come from caches of different ages. Waiting five minutes settles that."
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}
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$installer = $temporary
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}
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$launcher = @()
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$python = Get-Command py -ErrorAction SilentlyContinue
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if ($python) {
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$launcher = @("-3")
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} else {
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$python = Get-Command python3 -ErrorAction SilentlyContinue
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if (-not $python) {
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$python = Get-Command python -ErrorAction SilentlyContinue
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}
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}
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$needPython = "Python 3.8 or newer is required. Install it with " +
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"'winget install Python.Python.3.12' or from https://www.python.org/downloads/ " +
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"(tick 'Add python.exe to PATH'), then open a new PowerShell window and run this command again."
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if (-not $python) {
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throw $needPython
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}
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& $python.Source @launcher -c "import sys; raise SystemExit(sys.version_info < (3, 8))"
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if ($LASTEXITCODE -ne 0) { throw $needPython }
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& $python.Source @launcher $installer @InstallerArguments
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# The installer has already said what happened: its status is passed on
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# as it is (1 for files left to fetch under --check, 2 when nothing was
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# installed, 130 on Ctrl+C), not turned into a red exception that reads
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# as a crash and flattens every code to one.
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$installerExit = $LASTEXITCODE
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}
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catch {
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# One line saying what failed and what to do, rather than the red
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# exception block PowerShell prints for an uncaught throw.
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[Console]::Error.WriteLine("Error: " + $_.Exception.Message)
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$installerExit = 1
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}
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finally {
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if ($temporary -and (Test-Path -LiteralPath $temporary)) {
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Remove-Item -LiteralPath $temporary -Force
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}
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}
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if ($installerExit) {
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# Run from a file, the script ends with that status. Piped into iex it
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# runs in the user's own session, which exit would close.
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if ($PSScriptRoot) { exit $installerExit }
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$global:LASTEXITCODE = $installerExit
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}
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