ensure rev sync

bin/apply.ps1

@@ -5,10 +5,42 @@ $Root = Split-Path -Parent $ScriptDir
 $SingBox = Join-Path $Root 'works/sing-box'
 $PatchDir = Join-Path $Root 'works/patch'
 $Output = Join-Path $Root 'works/core'
+$RevFile = Join-Path $Root 'works/rev'
 
+# defaults
+$RepoUrl = 'git@git.inker.bot:arknights/sing-box.git'
+$UpstreamBranch = 'main'
+
+$ConfigFile = Join-Path $Root 'works/config'
+if (Test-Path $ConfigFile) {
+    Get-Content $ConfigFile | ForEach-Object {
+        if ($_ -match '^([^#=]+)=(.*)$') {
+            $key = $Matches[1].Trim()
+            $val = $Matches[2].Trim()
+            if ($key -eq 'REPO_URL') { $RepoUrl = $val }
+            elseif ($key -eq 'UPSTREAM_BRANCH') { $UpstreamBranch = $val }
+        }
+    }
+}
+
+# Clone if not present
 if (-not (Test-Path (Join-Path $SingBox '.git'))) {
-    Write-Error 'works/sing-box not found. Run update first.'
-    exit 1
+    Write-Host 'Cloning sing-box...'
+    if ($UpstreamBranch) {
+        git clone -b $UpstreamBranch $RepoUrl $SingBox
+    } else {
+        git clone $RepoUrl $SingBox
+    }
+}
+
+# Checkout stored rev
+if (Test-Path $RevFile) {
+    $Rev = (Get-Content $RevFile -Raw).Trim()
+    Write-Host "Checking out stored rev: $Rev"
+    git -C $SingBox fetch --all
+    git -C $SingBox checkout $Rev
+} else {
+    Write-Host 'Warning: works/rev not found, using current HEAD.' -ForegroundColor Yellow
 }
 
 Write-Host 'Initializing works/core/...'