Improve rke2-uninstall.ps1 (#6098)

Signed-off-by: Manuel Buil <mbuil@suse.com>

bundle/bin/rke2-uninstall.ps1

@@ -301,20 +301,45 @@ function Remove-Containerd () {
             }
         }
 
-        # Some resources in the namespace take a while to disappear. Try several times to remove the namespace and give up after 30s 
-        $endTime = (Get-Date).AddSeconds(30)
-        while ((Get-Date) -lt $endTime) {
+        # Resources in the namespace take a while to disappear. Snapshots are always the last to go.
+        # For 180s, snapshots are checked and namespace won't be removed until snapshots are gone.
+        # If timeout is reached, we will try removing snapshots directly. If that does not work, we stop trying and user is warned
+        $endTime = (Get-Date).AddSeconds(180)
+        Write-Output "Tasks, containers, images and snapshots are being deleted. This may take a while (timeout 180s)"
+        while ($true) {
             $namespaces = $(Find-Namespaces)
-            if ($namespaces) {
+            # If there are still namespaces and timeout was not reached
+            if ($namespaces -and (Get-Date) -lt $endTime) {
                 foreach ($ns in $namespaces) {
-                    Remove-Namespace $ns
+                    $snapshots = $(Find-Snapshots $ns)
+                    if ($snapshots) {
+                        Write-Output "Snapshots still present. Retrying namespace deletion in 10s..."
+                        Start-Sleep -Seconds 10
+                    } else {
+                        Remove-Namespace $ns
+                    }
                 }
-            } else {
+            # if there are still namespaces and timeout was reached
+            } elseif ($namespaces -and (Get-Date) -ge $endTime) {
+                Write-Output "Warning! Not all resources in containerd namespace $ns were able to be removed. " `
+                "The uninstallation script might not be able to remove all files under /var/lib/rancher/rke2"
+                break
+            # if there are no namespaces
+            } elseif (-not $namespaces) {
+                Write-Output "All containerd resources have been deleted"
                 break
             }
-            Start-Sleep -Seconds 5
             if ((Get-Date) -ge $endTime) {
-                Write-Output "Unable to remove all namespaces"
+                Write-Output "Time out waiting for containerd resources to be removed. Trying to remove snapshots directly"
+                foreach ($ns in $namespaces) {
+                    $snapshots = $(Find-Snapshots $ns)
+                    foreach ($snapshot in $snapshots) {
+                        Remove-Snapshot $ns $snapshot
+                    }
+                    # We wait for 20 seconds, try to remove the namespaces again and iterate one last time
+                    Start-Sleep -Seconds 20
+		            Remove-Namespace $ns
+                }
             }
         }
     }
@@ -327,6 +352,7 @@ function Remove-Containerd () {
 function Find-Namespaces () {
     Invoke-Ctr -cmd "namespace list -q"
 }
+
 function Find-ContainersInNamespace() {
     $namespace = $args[0]
     Invoke-Ctr -cmd "-n $namespace container list -q"
@@ -342,6 +368,15 @@ function Find-Images() {
     Invoke-Ctr -cmd "-n $namespace image list -q"
 }
 
+# The snapshots list does not have option "-q" to list only the keys
+function Find-Snapshots() {
+    $namespace = $args[0]
+    # We skip the first line which is the header KEY
+    Invoke-Ctr -cmd "-n $namespace snapshot list" | Select-Object -Skip 1 | ForEach-Object {
+        ($_ -split '\s+')[0]
+    }
+}
+
 function Remove-Image() {
     $namespace = $args[0]
     $image = $args[1]
@@ -365,6 +400,12 @@ function Remove-Namespace() {
     Invoke-Ctr -cmd "namespace remove $namespace"
 }
 
+function Remove-Snapshot() {
+    $namespace = $args[0]
+    $snapshot = $args[1]
+    Invoke-Ctr -cmd "-n $namespace snapshot delete $snapshot"
+}
+
 function Create-Lockfile() {
     # We fetch ctr.exe path and place the lock there
     $command = Get-Command ctr -ErrorAction SilentlyContinue