use for resume the biggest mounted swap (bsc#1071354)

src/modules/BootStorage.rb

@@ -107,9 +107,19 @@ def prep_partitions
     def available_swap_partitions
       ret = {}
 
-      staging.filesystems.select { |f| f.type.is?(:swap) }.each do |swap|
-        blk_device = swap.blk_devices[0]
-        ret[blk_device.name] = blk_device.size.to_i / 1024
+      mounted = Y2Storage::MountPoint.find_by_path(staging, Y2Storage::MountPoint::SWAP_PATH.to_s)
+      if mounted.empty?
+        log.info "No mounted swap found, using fallback."
+        staging.filesystems.select { |f| f.type.is?(:swap) }.each do |swap|
+          blk_device = swap.blk_devices[0]
+          ret[blk_device.name] = blk_device.size.to_i / 1024
+        end
+      else
+        log.info "Mounted swap found: #{mounted.inspect}"
+        mounted.each do |mp|
+          blk_device = mp.filesystem.blk_devices[0]
+          ret[blk_device.name] = blk_device.size.to_i / 1024
+        end
       end
 
       log.info "Available swap partitions: #{ret}"

test/boot_storage_test.rb

@@ -28,6 +28,13 @@
         "/dev/mapper/cr_swap" => 2_095_104
       )
     end
+
+    it "returns only mounted swaps if it is available" do
+      devicegraph_stub("multi_swap.yaml")
+      expect(subject.available_swap_partitions).to eq(
+        "/dev/sdb2" => 1_026_048
+      )
+    end
   end
 
   describe ".encrypted_boot?" do

test/data/multi_swap.yaml

@@ -0,0 +1,45 @@
+---
+- disk:
+    name: /dev/sda
+    size: 800 GiB
+    partition_table:  gpt
+    partitions:
+
+    - partition:
+        size:         5 GiB
+        name:         /dev/sda1
+        id:           swap
+        file_system:  swap
+
+    - partition:
+        size:         unlimited
+        name:         /dev/sda2
+        file_system:  btrfs
+        mount_point:  /home
+
+- disk:
+    name: /dev/sdb
+    size: 8 GiB
+    partition_table:  gpt
+    partitions:
+
+    - partition:
+        size:         1 MiB
+        name:         /dev/sdb1
+        id:           bios_boot
+        file_system:  vfat
+        uuid:         3de29985-8cc6-4c9d-8562-2ede26b0c5b6
+
+    - partition:
+        size:         1002 MiB
+        name:         /dev/sdb2
+        id:           swap
+        file_system:  swap
+        mount_point:  swap
+        uuid:         ec8e9948-ca5f-4b18-a863-ac999365e4a9
+
+    - partition:
+        size:         unlimited
+        name:         /dev/sdb3
+        file_system:  btrfs
+        mount_point:  /