windows: changes to install/upgrade/uninstallation process (#9025)

src/cli/uninstall.ps1

@@ -0,0 +1,112 @@
+# This script will remove the Bun installation at the location of this
+# script, removing it from %PATH%, deleting caches, and removing it from
+# the list of installed programs.
+param(
+  [switch]$PauseOnError = $false
+)
+
+$ErrorActionPreference = "Stop"
+
+# These two environment functions are roughly copied from https://github.com/prefix-dev/pixi/pull/692
+# They are used instead of `SetEnvironmentVariable` because of unwanted variable expansions.
+function Write-Env {
+  param([String]$Key, [String]$Value)
+
+  $EnvRegisterKey = Get-Item -Path 'HKCU:Environment'
+  if ($null -eq $Value) {
+    $EnvRegisterKey.DeleteValue($Key)
+  } else {
+    $RegistryValueKind = if ($Value.Contains('%')) {
+      [Microsoft.Win32.RegistryValueKind]::ExpandString
+    } elseif ($EnvRegisterKey.GetValue($Key)) {
+      $EnvRegisterKey.GetValueKind($Key)
+    } else {
+      [Microsoft.Win32.RegistryValueKind]::String
+    }
+    $EnvRegisterKey.SetValue($Key, $Value, $RegistryValueKind)
+  }
+}
+
+function Get-Env {
+  param([String] $Key)
+
+  $RegisterKey = Get-Item -Path 'HKCU:Environment'
+  $EnvRegisterKey.GetValue($Key, $null, [Microsoft.Win32.RegistryValueOptions]::DoNotExpandEnvironmentNames)
+}
+
+if (-not (Test-Path "${PSScriptRoot}\bin\bun.exe")) {
+  Write-Host "bun.exe not found in ${PSScriptRoot}\bin`n`nRefusing to delete this directory as it may.`n`nIf this uninstallation is still intentional, please just manually delete this folder."
+  if ($PauseOnError) { pause }
+  exit 1
+}
+
+function Stop-Bun {
+  try {
+    Get-Process -Name bun | Where-Object { $_.Path -eq "${PSScriptRoot}\bin\bun.exe" } | Stop-Process -Force
+  } catch [Microsoft.PowerShell.Commands.ProcessCommandException] {
+    # ignore
+  } catch {
+    Write-Host "There are open instances of bun.exe that could not be automatically closed."
+    if ($PauseOnError) { pause }
+    exit 1
+  }
+}
+
+# Remove ~\.bun\bin\bun.exe
+try {
+  Stop-Bun
+  Remove-Item "${PSScriptRoot}\bin\bun.exe" -Force
+} catch {
+  # Try a second time
+  Stop-Bun
+  Start-Sleep -Seconds 1
+  try {
+    Remove-Item "${PSScriptRoot}\bin\bun.exe" -Force
+  } catch {
+    Write-Host $_
+    Write-Host "`n`nCould not delete ${PSScriptRoot}\bin\bun.exe."
+    Write-Host "Please close all instances of bun.exe and try again."
+    if ($PauseOnError) { pause }
+    exit 1
+  }
+}
+
+# Remove ~\.bun
+try {
+  Remove-Item "${PSScriptRoot}" -Recurse -Force
+} catch {
+  Write-Host "Could not delete ${PSScriptRoot}."
+  if ($PauseOnError) { pause }
+  exit 1
+}
+
+# Delete some tempdir files. Do not fail if an error happens here
+try {
+  Remove-Item "${Temp}\bun-*" -Recurse -Force
+} catch {}
+try {
+  Remove-Item "${Temp}\bunx-*" -Recurse -Force
+} catch {}
+
+# Remove Entry from path
+try {
+  $Path = Get-Env -Key 'Path'
+  $Path = $Path -split ';'
+  $Path = $Path | Where-Object { $_ -ne "${PSScriptRoot}\bin" }
+  Write-Env -Key 'Path' -Value ($Path -join ';')
+} catch {
+  Write-Host "Could not remove ${PSScriptRoot}\bin from PATH."
+  if ($PauseOnError) { pause }
+  exit 1
+}
+
+# Remove Entry from Windows Installer, if it is owned by this installation.
+try {
+  $item = Get-Item "HKCU:\Software\Microsoft\Windows\CurrentVersion\Uninstall\Bun";
+  $location = $item.GetValue("InstallLocation");
+  if ($location -eq "${PSScriptRoot}") {
+    Remove-Item "HKCU:\Software\Microsoft\Windows\CurrentVersion\Uninstall\Bun" -Recurse
+  }
+} catch {
+  # unlucky tbh
+}