1. Staging
   1. Operation Actions
      1. <create>
         1. Downloads the file to be created, stores in cache
         2. Redownloads if an integrity mismatch occurs
         3. Destination is empty and writable
         4. There's enough free space to DL the file
      2. <update>
         1. Target exists
         2. Target integrity matches the specified one
         3. Enough free space to DL the patch file *and* the clone of the target file
         4. Download the patch file, stores in cache
         5. Clone the target file, stores in cache
      3. <rename>
         1. Target exists
         2. Destination is empty
      4. <delete>
         1. Target exists
2. Deployment
   1. Operation Actions
      1. <create>
         1. Moves file from cache to its destination
         2. Destination is writable
         3. Staged file exists
      2. <update>
         1. Apply patch on the clone in cache
         2. Validate integrity of the patched clone
         3. Move the source to the cache as the new backup
         4. Move the patched source to its destination
         5. Staged patch file still exists
         6. Staged clone is still writable
         7. Original source still exists
      3. <rename>
         1. Move target to destination
         2. Target still exists
      4. <delete>
         1. Target still exists
         2. Move target to cache
3. Rollback
   1. Operation Actions
      1. <create>
         1. Remove file
         2. Destination exists and is writable
      2. <update>
         1. Replace the newly-patched target with the backup
         2. Backup still exists in cache
      3. <rename>
         1. Move target to from destination to its original location
         2. Target still exists
      4. <delete>
         1. Target still exists in cache
         2. Move target from cache to its original destination
4. Committing
   1. Operation Actions
      1. <create>
         1. Moves file from cache to its destination
      2. <update>
         1. Delete the patch file
         2. Delete the source backup
      3. <rename>
         1. -
      4. <delete>
         1. Delete target from cache
5. Version corruption
6. Version updated
7. 1
8. 2