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implement URL to VURL migration

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This needs the content to be present in order to hash it. But it's not
possible for a module used by Backend.URL to call inAnnex because that
would entail a dependency loop. So instead, rely on the fact that
Command.Migrate calls inAnnex before performing a migration.

But, Command.ExamineKey calls fastMigrate and the key may or may not
exist, and it's not wanting to actually perform a migration in any case.
To handle that, had to add an additional value to fastMigrate to
indicate whether the content is inAnnex.

Factored generateEquivilantKey out of Remote.Web.

Note that migrateFromURLToVURL hardcodes use of the SHA256E backend.
It would have been difficult not to, given all the dependency loop
issues. But --backend and annex.backend are used to tell git-annex
migrate to use VURL in any case, so there's no config knob that
the user could expect to configure that.

Sponsored-by: Brock Spratlen on Patreon
This commit is contained in:
Joey Hess 2024-03-01 16:42:02 -04:00
parent 2b5ba03c01
commit e7652b0997
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GPG key ID: DB12DB0FF05F8F38
14 changed files with 82 additions and 34 deletions
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10
Backend/Hash.hs
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@ -53,8 +53,10 @@ cryptographicallySecure (Blake2spHash _) = True
cryptographicallySecure SHA1Hash = False
cryptographicallySecure MD5Hash = False
{- Order is slightly significant; want SHA256 first, and more general
- sizes earlier. -}
{- Order is significant. The first hash is the default one that git-annex
- uses, and must be cryptographically secure.
-
- Also, want more common sizes earlier than uncommon sizes. -}
hashes :: [Hash]
hashes = concat
[ map (SHA2Hash . HashSize) [256, 512, 224, 384]
@ -167,8 +169,8 @@ needsUpgrade key = or
, not (hasExt (fromKey keyVariety key)) && keyHash key /= S.fromShort (fromKey keyName key)
]
trivialMigrate :: Key -> Backend -> AssociatedFile -> Annex (Maybe Key)
trivialMigrate oldkey newbackend afile = trivialMigrate' oldkey newbackend afile
trivialMigrate :: Key -> Backend -> AssociatedFile -> Bool -> Annex (Maybe Key)
trivialMigrate oldkey newbackend afile _inannex = trivialMigrate' oldkey newbackend afile
<$> (annexMaxExtensionLength <$> Annex.getGitConfig)
trivialMigrate' :: Key -> Backend -> AssociatedFile -> Maybe Int -> Maybe Key