[Bug 2102048] Re: [FFE] TPMFDE passphrase / pin support

[Dan Bungert]

Sorry, the PR is merged already.  I will back it out if we deem that necessary.
https://github.com/canonical/subiquity/pull/2174

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Title:
  [FFE] TPMFDE passphrase / pin support

Status in subiquity package in Ubuntu:
  Triaged

Bug description:
  I would like to request a feature freeze exception for the feature
  "TPMFDE passphrase / pin support" in Subiquity.

  [ Rationale ]

  Support requiring "additional key material" for TPMFDE - TPM +
  passphrase for example.

  [ Proposed changes ]

  The guided storage API is extended to accept an optional pin field,
  and pin or passphrase may be supplied when making the TPMFDE guided
  choice.  If so, this information is saved for the "setup-storage-
  encryption" step and supplied to snapd at that time.

  [ Regression Potential ]

  The relevant changes post-FF are entirely on the TPMFDE code path, so
  the non-TPMFDE regression potential is expected to be very low. I
  believe existing TPMFDE test plans will address the rest.

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