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

[Viktor Tadijanovic]

I am having a same issue as reported by Jake and Jim.  Trying to install
on Lanner hardware using USB stick with "ubuntu-18.04.2-live-server-
amd64.iso" image.  I used serial console output by enabling
console=ttyS0,115200n8 in Grub config.  The installer fails once install
attempts to format a hard drive.  I get the following error:

 Full installer output ───────────────────────────┐
│Traceback (most recent call last):                                            │
│  File "/snap/subiquity/664/usr/lib/python3.6/runpy.py", line 193, in         │
│_run_module_as_main                                                           │
│    "__main__", mod_spec)                                                     │
│  File "/snap/subiquity/664/usr/lib/python3.6/runpy.py", line 85, in _run_code│
│    exec(code, run_globals)                                                   │
│  File "/snap/subiquity/664/lib/python3.6/site-packages/curtin/__main__.py",  │
│line 4, in <module>                                                           │
│    sys.exit(main())                                                          │
│  File                                                                        │
│"/snap/subiquity/664/lib/python3.6/site-packages/curtin/commands/main.py",    │
│line 177, in main                                                             │
│    raise OSError("Unable to find helpers or 'curtin' exe to add to path")    │
│OSError: Unable to find helpers or 'curtin' exe to add to path                │
│

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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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