[Bug 1895329] Re: when booting cloned live drive 3rd partition is created without file system

[Michael Hudson-Doyle]

It could be a race, this is the code that creates the partition and
filesystem:

    echo "start=$start" | sfdisk --no-reread -q $DEVICE -a || return
    for d in ${DEVICE}$newpartno ${DEVICE}p$newpartno ${DEVICE}-part$newpartno; do
        if [ -e $d ]; then
            mkfs.ext4 -q -L "$(root_persistence_label)" -F $d
            break
        fi
    done
    udevadm trigger
    udevadm settle

But my understanding is that sfdisk (with the options we use here)
doesn't return until it has told the kernel about the new partitions.

I also doubt that the changes to image mastering made a difference here
and suspect it was some other change that coincidentally happened around
the same time but who knows. (If the partition wasn't being created, I
could quite easily believe the mastering changes would make a
difference). I'll see if I can reproduce on my laptop tomorrow.

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https://bugs.launchpad.net/bugs/1895329

Title:
  when booting cloned live drive 3rd partition is created without file
  system

Status in casper package in Ubuntu:
  Incomplete

Bug description:
  When iso testing the current daily Lubuntu iso file (dated 2020-09-11),
  I notice that a third partition is created (during the boot process),
  but no file system is recognized by lsblk -f, and it is not used for
  logging (as we are used to from Focal and previous versions of Groovy).

  In this case it is seen by lsblk as /dev/sda3. See details in the
  attached file.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: casper 1.452
  ProcVersionSignature: Ubuntu 5.8.0-18.19-generic 5.8.4
  Uname: Linux 5.8.0-18-generic x86_64
  ApportVersion: 2.20.11-0ubuntu45
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.452
  CurrentDesktop: LXQt
  Date: Fri Sep 11 17:20:03 2020
  LiveMediaBuild: Lubuntu 20.10 "Groovy Gorilla" - Alpha amd64 (20200911)
  SourcePackage: casper
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.casper.conf: 2020-09-11T17:08:26.454154

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