[Bug 1820604] Re: curtin fails to find itself in subiquity snap, when running on serial-subiquity at .service

[Steve Langasek]

Michael, the livecd-rootfs task for bionic is still open, which implies
there's still work to be done to fix this for 18.04.3.

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Title:
  curtin fails to find itself in subiquity snap, when running on serial-
  subiquity at .service

Status in curtin:
  Invalid
Status in subiquity:
  Fix Released
Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Bionic:
  Triaged

Bug description:
  serial-subiquity at .service runs very differently to the tty1 subiquity.

  In seiral-subiquity@ case, it doesn't block starting on snapd as it
  doesn't use /usr/bin/snap run.

  Also, it doesn't execute subiquity.subiquity-service script, meaning
  that PATH setting there is not exported, causing troubles for curtin
  to reexec itself, or to find the right python in $PATH.

  
  Fix that in both livecd-rootfs & subiquity.

  https://github.com/CanonicalLtd/subiquity/pull/428
  https://code.launchpad.net/~xnox/livecd-rootfs/+git/livecd-rootfs/+merge/364888

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