[Bug 1846762] [NEW] automatic creation of casper-rw breaks installation from "disk"

[Mario Limonciello]

Public bug reported:

OEM factory installation typically puts the Ubuntu media onto a recovery
partition and uses a preseeding recipe to install into the remaining
free space on the disk.

This casper change appears to have broken that behavior:

casper (1.415) eoan; urgency=medium

  * Persist logs on the install media by default:
    - Try to auto create a casper-rw filesystem on the install media if there
      appears to be at least 100MiB free on it.
    - Use a casper-rw filesystem for /var/log if it is not being used for
      persistence.
  * Fix some '|| continue's that got missed when check_dev got refactored into
    a function.

 -- Michael Hudson-Doyle <michael.hudson at ubuntu.com>  Thu, 08 Aug 2019
16:26:41 +1200

In my testing (in QEMU) I can see errors from the installer that no free
space can be found.  Examining the disk I see that a casper-rw partition
has been created in the free space taking up the entire disk.

Would you please consider to recognize the "nopersistent" kernel command
line option already supported by casper to disable this behavior?

** Affects: casper (Ubuntu)
     Importance: Undecided
     Assignee: Michael Hudson-Doyle (mwhudson)
         Status: New

** Changed in: casper (Ubuntu)
     Assignee: (unassigned) => Michael Hudson-Doyle (mwhudson)

** Description changed:

  OEM factory installation typically puts the Ubuntu media onto a recovery
  partition and uses a preseeding recipe to install into the remaining
  free space on the disk.
  
  This casper change appears to have broken that behavior:
  
  casper (1.415) eoan; urgency=medium
  
-   * Persist logs on the install media by default:
-     - Try to auto create a casper-rw filesystem on the install media if there
-       appears to be at least 100MiB free on it.
-     - Use a casper-rw filesystem for /var/log if it is not being used for
-       persistence.
-   * Fix some '|| continue's that got missed when check_dev got refactored into
-     a function.
+   * Persist logs on the install media by default:
+     - Try to auto create a casper-rw filesystem on the install media if there
+       appears to be at least 100MiB free on it.
+     - Use a casper-rw filesystem for /var/log if it is not being used for
+       persistence.
+   * Fix some '|| continue's that got missed when check_dev got refactored into
+     a function.
  
-  -- Michael Hudson-Doyle <michael.hudson at ubuntu.com>  Thu, 08 Aug 2019
+  -- Michael Hudson-Doyle <michael.hudson at ubuntu.com>  Thu, 08 Aug 2019
  16:26:41 +1200
  
- In my testing (in QEMU) I can errors that no free space can be found.
- Examining the disk I see that a casper-rw partition has been created in
- the free space taking up the entire disk.
+ In my testing (in QEMU) I can see errors from the installer that no free
+ space can be found.  Examining the disk I see that a casper-rw partition
+ has been created in the free space taking up the entire disk.
  
  Would you please consider to recognize the "nopersistent" kernel command
  line option already supported by casper to disable this behavior?

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https://bugs.launchpad.net/bugs/1846762

Title:
  automatic creation of casper-rw breaks installation from "disk"

Status in casper package in Ubuntu:
  New

Bug description:
  OEM factory installation typically puts the Ubuntu media onto a
  recovery partition and uses a preseeding recipe to install into the
  remaining free space on the disk.

  This casper change appears to have broken that behavior:

  casper (1.415) eoan; urgency=medium

    * Persist logs on the install media by default:
      - Try to auto create a casper-rw filesystem on the install media if there
        appears to be at least 100MiB free on it.
      - Use a casper-rw filesystem for /var/log if it is not being used for
        persistence.
    * Fix some '|| continue's that got missed when check_dev got refactored into
      a function.

   -- Michael Hudson-Doyle <michael.hudson at ubuntu.com>  Thu, 08 Aug 2019
  16:26:41 +1200

  In my testing (in QEMU) I can see errors from the installer that no
  free space can be found.  Examining the disk I see that a casper-rw
  partition has been created in the free space taking up the entire
  disk.

  Would you please consider to recognize the "nopersistent" kernel
  command line option already supported by casper to disable this
  behavior?

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