[Bug 1182646] [NEW] maas-import-pxe-files fails to update ephemeral images

[Andres Rodriguez]

Public bug reported:

[Impact]
If new ephemeral images are ready to be installed, maas-import-* scripts fail because it cannot overwrite a symlink that has been created to support FPI. This prevents maas from importing new ephemeral images.

[Test Case]
1. Install maas.
2. maas-import-pxe-files
3. edit /etc/maas/import_ephemerals and add STREAM="daily"
4. run maas-import-pxe-files again, it will download a newer ephemeral image and will fail to install it.
5. Apply the fix.
6. Run maas-import-pxe-files again, and it will install the image successfully.

[Regression Potential]
Minimal, this make sure that a new image being imported gets installed successfully.

** Affects: maas (Ubuntu)
     Importance: High
         Status: Confirmed

** Affects: maas (Ubuntu Raring)
     Importance: High
         Status: New

** Also affects: maas (Ubuntu Raring)
   Importance: Undecided
       Status: New

** Changed in: maas (Ubuntu)
       Status: New => Confirmed

** Changed in: maas (Ubuntu)
   Importance: Undecided => High

** Changed in: maas (Ubuntu Raring)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1182646

Title:
  maas-import-pxe-files fails to update ephemeral images

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