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add RemoteStateHandle

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This solves the problem of sameas remotes trampling over per-remote
state. Used for:

* per-remote state, of course
* per-remote metadata, also of course
* per-remote content identifiers, because two remote implementations
  could in theory generate the same content identifier for two different
  peices of content

While chunk logs are per-remote data, they don't use this, because the
number and size of chunks stored is a common property across sameas
remotes.

External special remote had a complication, where it was theoretically
possible for a remote to send SETSTATE or GETSTATE during INITREMOTE or
EXPORTSUPPORTED. Since the uuid of the remote is typically generate in
Remote.setup, it would only be possible to pass a Maybe
RemoteStateHandle into it, and it would otherwise have to construct its
own. Rather than go that route, I decided to send an ERROR in this case.
It seems unlikely that any existing external special remote will be
affected. They would have to make up a git-annex key, and set state for
some reason during INITREMOTE. I can imagine such a hack, but it doesn't
seem worth complicating the code in such an ugly way to support it.

Unfortunately, both TestRemote and Annex.Import needed the Remote
to have a new field added that holds its RemoteStateHandle.
This commit is contained in:
Joey Hess 2019-10-14 12:33:27 -04:00
parent 37f0abbca8
commit 9828f45d85
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GPG key ID: DB12DB0FF05F8F38
31 changed files with 274 additions and 209 deletions
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5
Remote/BitTorrent.hs
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@ -52,8 +52,8 @@ list _autoinit = do
r <- liftIO $ Git.Construct.remoteNamed "bittorrent" (pure Git.Construct.fromUnknown)
return [r]
gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex (Maybe Remote)
gen r _ c gc = do
gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> RemoteStateHandle -> Annex (Maybe Remote)
gen r _ c gc rs = do
cst <- remoteCost gc expensiveRemoteCost
return $ Just Remote
{ uuid = bitTorrentUUID
@ -85,6 +85,7 @@ gen r _ c gc = do
, getInfo = return []
, claimUrl = Just (pure . isSupportedUrl)
, checkUrl = Just checkTorrentUrl
, remoteStateHandle = rs
}
downloadKey :: Key -> AssociatedFile -> FilePath -> MeterUpdate -> Annex (Bool, Verification)