- Currently theme uploads delete the existing theme before copying the new files into place
- If something goes wrong with the delete action, you will end up in a bad state
- Some or all of the files may be deleted, but now Ghost won't try to put the new theme in place, instead returning an error
- This leaves you with an invalid active theme and a broken site
- Unlike delete, move is a one-hit operation that succeeds or fails, there moving a theme is safer than deleting
- This updated code moves the old theme to a folder with the name [theme-name]-[uuid] before copying the new theme into place
- Even if this fails, the files should not be gone
- There's a cleanup operation to remove the theme backup at the end, but we don't care too much if this fails
d541a14826