mounts/org.osbuild.btrfs: add support for compression

Also, add it to the sample manifest.

mounts/org.osbuild.btrfs

@@ -41,6 +41,9 @@ SCHEMA_2 = """
       "subvol": {
         "description": "Subvolume to be mounted",
         "type": "string"
+      },
+      "compress": {
+        "type": "string"
       }
     }
   }

osbuild/mounts.py

@@ -141,6 +141,8 @@ class FileSystemMountService(MountService):
             opts.append(f"shortname={options['shortname']}")
         if "subvol" in options:
             opts.append(f"subvol={options['subvol']}")
+        if "compress" in options:
+            opts.append(f"compress={options['compress']}")
         if opts:
             return ["-o", ",".join(opts)]
         return []

test/data/manifests/fedora-boot-btrfs.json

@@ -949,7 +949,7 @@
                 "uuid": "6e4ff95f-f662-45ee-a82a-bdf44a2d0b75",
                 "vfs_type": "btrfs",
                 "path": "/",
-                "options": "subvol=root"
+                "options": "subvol=root,compress=zstd:1"
               },
               {
                 "uuid": "0194fdc2-fa2f-4cc0-81d3-ff12045b73c8",
@@ -969,7 +969,7 @@
                 "vfs_type": "btrfs",
                 "path": "/home",
                 "passno": 3,
-                "options": "subvol=home"
+                "options": "subvol=home,compress=zstd:1"
               }
             ]
           }
@@ -1204,7 +1204,8 @@
               "source": "root",
               "target": "/",
               "options": {
-                "subvol": "root"
+                "subvol": "root",
+                "compress": "zstd:1"
               }
             },
             {
@@ -1213,7 +1214,8 @@
               "source": "root",
               "target": "/home",
               "options": {
-                "subvol": "home"
+                "subvol": "home",
+                "compress": "zstd:1"
               }
             },
             {

test/data/manifests/fedora-boot-btrfs.mpp.yaml

@@ -64,7 +64,7 @@ pipelines:
             - uuid: 6e4ff95f-f662-45ee-a82a-bdf44a2d0b75
               vfs_type: btrfs
               path: /
-              options: subvol=root
+              options: subvol=root,compress=zstd:1
             - uuid: 0194fdc2-fa2f-4cc0-81d3-ff12045b73c8
               vfs_type: ext4
               path: /boot
@@ -78,7 +78,7 @@ pipelines:
               vfs_type: btrfs
               path: /home
               passno: 3
-              options: subvol=home
+              options: subvol=home,compress=zstd:1
       - type: org.osbuild.grub2
         options:
           root_fs_uuid: 6e4ff95f-f662-45ee-a82a-bdf44a2d0b75
@@ -230,12 +230,14 @@ pipelines:
             target: /
             options:
               subvol: root
+              compress: zstd:1
           - name: home
             type: org.osbuild.btrfs
             source: root
             target: /home
             options:
               subvol: home
+              compress: zstd:1
           - name: boot
             type: org.osbuild.ext4
             source: boot