chore: add PowerShell script to export GPG public key for auto-import in devcontainer

2026-09-09 18:03:21 +00:00 · 2026-07-07 15:03:03 +00:00
parent 114de75e73
commit 0c7e16e98e
2 changed files with 128 additions and 0 deletions
@@ -104,6 +104,16 @@ So the easiest setup is:
 ./.devcontainer/export-signing-key.sh <YOUR_KEY_ID>
 ```

+On Windows PowerShell, use:
+
+```powershell
+# on the HOST, from repo root (auto-uses git user.signingkey)
+.\.devcontainer\export-signing-key.ps1
+
+# or pass a key explicitly
+.\.devcontainer\export-signing-key.ps1 <YOUR_KEY_ID>
+```
+
 The helper auto-selects `gpg2`/`gpg` based on where your key is visible, which
 avoids host setups where the two binaries use different keyrings.

@@ -0,0 +1,118 @@
+#!/usr/bin/env pwsh
+Set-StrictMode -Version Latest
+$ErrorActionPreference = 'Stop'
+
+# Export your GPG public key to .git/signing.pub so the devcontainer can auto-import it.
+# Usage:
+#   .\.devcontainer\export-signing-key.ps1
+#   .\.devcontainer\export-signing-key.ps1 <KEY_ID>
+
+param(
+    [Parameter(Position = 0)]
+    [string]$KeyId
+)
+
+$scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
+$repoRoot = Resolve-Path (Join-Path $scriptDir '..')
+$outputFile = Join-Path $repoRoot '.git/signing.pub'
+
+if (-not $KeyId) {
+    $KeyId = (git config --global user.signingkey 2>$null).Trim()
+}
+
+if (-not $KeyId) {
+    Write-Error 'No key ID provided and git user.signingkey is not set.'
+    Write-Host 'Set it with: git config --global user.signingkey <YOUR_KEY_ID>'
+    Write-Host 'Or run: .\.devcontainer\export-signing-key.ps1 <YOUR_KEY_ID>'
+    exit 1
+}
+
+$availableBins = @()
+foreach ($candidate in @('gpg2', 'gpg')) {
+    if (Get-Command $candidate -ErrorAction SilentlyContinue) {
+        $availableBins += $candidate
+    }
+}
+
+if ($availableBins.Count -eq 0) {
+    Write-Error 'Neither gpg nor gpg2 is available on PATH.'
+    exit 1
+}
+
+function Test-HasSecretKey {
+    param(
+        [string]$Bin,
+        [string]$Key
+    )
+
+    $lines = & $Bin --list-secret-keys --with-colons $Key 2>$null
+    return ($lines | Select-String '^sec' -Quiet)
+}
+
+function Invoke-TryExport {
+    param(
+        [string]$Bin,
+        [string]$Key,
+        [string]$File
+    )
+
+    $content = & $Bin --armor --export $Key 2>$null
+    if ($LASTEXITCODE -ne 0) {
+        return $false
+    }
+
+    if ([string]::IsNullOrWhiteSpace(($content -join ""))) {
+        return $false
+    }
+
+    [System.IO.File]::WriteAllLines($File, $content, [System.Text.Encoding]::ASCII)
+    return ((Test-Path $File) -and ((Get-Item $File).Length -gt 0))
+}
+
+$selectedBin = $null
+foreach ($bin in $availableBins) {
+    if (Test-HasSecretKey -Bin $bin -Key $KeyId) {
+        $selectedBin = $bin
+        break
+    }
+}
+
+if (-not $selectedBin) {
+    $selectedBin = $availableBins[0]
+}
+
+if (Test-Path $outputFile) {
+    Remove-Item $outputFile -Force
+}
+
+$ok = Invoke-TryExport -Bin $selectedBin -Key $KeyId -File $outputFile
+if (-not $ok) {
+    foreach ($bin in $availableBins) {
+        if ($bin -eq $selectedBin) {
+            continue
+        }
+
+        $ok = Invoke-TryExport -Bin $bin -Key $KeyId -File $outputFile
+        if ($ok) {
+            $selectedBin = $bin
+            break
+        }
+    }
+}
+
+if (-not $ok) {
+    if (Test-Path $outputFile) {
+        Remove-Item $outputFile -Force
+    }
+
+    Write-Error "Failed to export public key for $KeyId."
+    Write-Host "Tried binaries: $($availableBins -join ' ')"
+    Write-Host 'Check key visibility with:'
+    Write-Host '  gpg --list-secret-keys --keyid-format=long'
+    Write-Host '  gpg2 --list-secret-keys --keyid-format=long'
+    exit 1
+}
+
+Write-Host "Exported public key $KeyId to $outputFile"
+Write-Host "Using: $selectedBin"
+Write-Host 'Rebuild/start the devcontainer to auto-import it.'