Prototype: Create TAR space in storage service

[ross-spencer]

Draft PR that may be shaped into something more useful for NHA over the next few weeks...

Currently written

• Tape archive Space migration.
• Tape archive outline code.

TODO

• Tests.
• Pointer file extensions, e.g. new composition level. Contingent on composition levels below.
• Fallback code, e.g. if Tape-archive extract fails, e.g. attempt reingest, then attempt again.

Questions

1. See Santi's below: Naming of the TAR after storing. Currently, AIP is stored, then the tar is created and replaces the original AIP in the storage service.
2. Is the pointer file extension as simple as adding a composition level?
3. Should the Space be used for an AIPstore and Replicator? (my vote: Yes but see P1 issue below).

Related issues and priorities (P1 high, P5 low):

• P1: (If used as AIPstore) Affects reingest: Problem: GPG encrypted uncompressed packages are failing reingest archivematica/Issues#1431
• P2: Saving with different package extensions: Problem: Store AIP fails with gzipped tar or parallel bzip2 compression in GPG-encrypted AIP Store locations archivematica/Issues#1293
• P4: No pointer files for uncompressed packages: Problem: uncompressed AIPs need pointer files #324
• P5: Pointer composition levels not being written correctly: Problem: Composition levels are not being written correctly to pointer files for tar.bz (probably tar.gz as well) archivematica/Issues#772

Testing checks:

• Ingest (Uncompressed, 7z, tar.gz).
• METS download.
• Fixity.
• Re-ingest and update.
• Replications update correctly.

[scollazo]

After untaring the AIP, the folder name is tar-<UUID>. Should it be <UUID> to align with the uncompressed AIPs?

[tw4l]

Closed in favour of #593