Add a BTRFS example

examples/btrfs.py

@@ -0,0 +1,40 @@
+import os
+
+import blivet
+from blivet.size import Size
+from blivet.util import set_up_logging, create_sparse_tempfile
+
+set_up_logging()
+b = blivet.Blivet()   # create an instance of Blivet (don't add system devices)
+
+# create a disk image file on which to create new devices
+disk1_file = create_sparse_tempfile("disk1", Size("100GiB"))
+b.disk_images["disk1"] = disk1_file
+
+b.reset()
+
+try:
+    disk1 = b.devicetree.get_device_by_name("disk1")
+
+    b.initialize_disk(disk1)
+
+    part = b.new_partition(size=Size("50GiB"), fmt_type="btrfs")
+    b.create_device(part)
+
+    # allocate the partitions (decide where and on which disks they'll reside)
+    blivet.partitioning.do_partitioning(b)
+
+    # new btrfs volume
+    vol = b.new_btrfs(parents=[part])
+    b.create_device(vol)
+
+    # new btrfs subvolume
+    dev = b.new_btrfs_sub_volume(name="subvol1", parents=[vol])
+    b.create_device(dev)
+
+    # write the new partitions to disk and format them as specified
+    b.do_it()
+    print(b.devicetree)
+finally:
+    b.devicetree.teardown_disk_images()
+    os.unlink(disk1_file)