Add 'state' dirs as btrfs subvolumes

These subvolumes exist in state/{home,opt,srv}
of the disk's root. They are not mounted by
default.

1 files changed, 11 insertions, 0 deletions

diff --git a/writeexts.py b/writeexts.py
index cb47f63d..49cd89dd 100755
--- a/writeexts.py
+++ b/writeexts.py
@@ -65,6 +65,7 @@ class WriteExtension(cliapp.Application):
             version_label = 'version1'
             version_root = os.path.join(mp, 'systems', version_label)
             os.makedirs(version_root)
+            self.create_state(mp)
             self.create_orig(version_root, temp_root)
             self.create_fstab(version_root)
             self.create_run(version_root)
@@ -117,6 +118,16 @@ class WriteExtension(cliapp.Application):
         '''Parse RAM size from environment.'''
         return self._parse_size_from_environment('RAM_SIZE', '1G')
 
+    def create_state(self, real_root):
+        '''Create the state subvolumes that are shared between versions'''
+
+        self.status(msg='Creating state subvolumes')
+        os.mkdir(os.path.join(real_root, 'state'))
+        statedirs = ['home', 'opt', 'srv']
+        for statedir in statedirs:
+            dirpath = os.path.join(real_root, 'state', statedir)
+            cliapp.runcmd(['btrfs', 'subvolume', 'create', dirpath])
+
     def create_raw_disk_image(self, filename, size):
         '''Create a raw disk image.'''