Arvados

h1. Collections as regular Arvados objects

(See #3036)

* Collections are assigned regular UUIDs

* Collections have a regular @owner_uuid@ instead

* Manifest hash goes into the @portable_data_hash@ field

* @manifest_text@ and @portable_data_hash@ can be edited

* Can access collections on API by uuid (returns regular record) or @portable_data_hash@ (returns record containing @uuid@, @portable_data_hash@ and @manifest_text@ with @uuid@==@portable_data_hash@)

** Setting/changing @manifest_text@ on its own updates @portable_data_hash@

** Setting/changing @portable_data_hash@ on its own fetches the manifest from Keep

** @manifest_text@ and @portable_data_hash@ have to match

* Add mutable @name@, @description@, @properties@ fields

** Use same logic for names/descriptions as already exist for other Arvados objects

* Continue to use manifest text hash (@portable_data_hash@) for crunch

** Choosers set the value to the manifest hash, record the selected collection uuid on link_uuid

** Task output continues to be a manifest fragment or manifest hash+token stored in Keep

** Crunch-job continues to set job output to manifest hash+token

** Crunch-job creates output collection with @owner_uuid@ as the user (which means it will show up in the "home" project when #3499 is merged)

* Pipeline runner is responsible for creating a collection in the target project and setting the name

** Add an @output_name@ field to the component description

* When user clicks on a link to a collection uuid, it should include the expected portable data hash in the URL

** If there is a mismatch, it should throw up a warning and possibly tell the user what changed

* Disallow content hashes in @head_uuid@ and @tail_uuid@ fields of links

h2. Migration

* Update schema to add @name@, @description@, @properties@ columns

* Convert name links to collection objects owned by @tail_uuid@ and delete the name links

* For remaining collections not accessible through name links, look for *can_read* permission links and create collections owned to the relevant user or group

* Any other collections will remain owned by system user and will have to be assigned manually (?)

* Update links (other than name or permission links) that point to a manifest hash to point to an appropriate collection uuid instead