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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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14 changed files with 82 additions and 34 deletions
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5
doc/git-annex-addurl.mdwn
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@ -57,8 +57,9 @@ be used to get better filenames.
content is downloaded from the web. Once a checksum has been recorded,
subsequent downloads from the web must have the same checksum.
Note that this option currently only has an effect when using the
web special remote, not other special remotes that handle urls.
When addurl was used without this option before, the file it added
can be converted to be verifiable by migrating it to the VURL backend.
For example: `git-annex migrate foo --backend=VURL`
* `--raw`

4
doc/todo/verified_relaxed_urls.mdwn
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@ -11,8 +11,7 @@ verify the content.
The web special remote can hash the content as it's downloading it from the
web, and record the resulting hash-based key.
> Status: Working, but it's not yet possible to migrate an URL key to a VURL key. Should be easy
> to add support for this. --[[Joey]]
> [[done]] --[[Joey]]
## handling upgrades
@ -126,4 +125,3 @@ key what is the same VURL, or another VURL in a loop. Leading to a crafted
git-annex branch that DOSes git-annex.
To avoid this, any VURL in equivilant keys will be ignored.