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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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7
Remote/WebDAV.hs
View file

@ -50,8 +50,8 @@ remote = RemoteType
, importSupported = importUnsupported
}
gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex (Maybe Remote)
gen r u c gc = new <$> remoteCost gc expensiveRemoteCost
gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> RemoteStateHandle -> Annex (Maybe Remote)
gen r u c gc rs = new <$> remoteCost gc expensiveRemoteCost
where
new cst = Just $ specialRemote c
(prepareDAV this $ store chunkconfig)
@ -95,11 +95,12 @@ gen r u c gc = new <$> remoteCost gc expensiveRemoteCost
, appendonly = False
, availability = GloballyAvailable
, remotetype = remote
, mkUnavailable = gen r u (M.insert "url" "http://!dne!/" c) gc
, mkUnavailable = gen r u (M.insert "url" "http://!dne!/" c) gc rs
, getInfo = includeCredsInfo c (davCreds u) $
[("url", fromMaybe "unknown" (M.lookup "url" c))]
, claimUrl = Nothing
, checkUrl = Nothing
, remoteStateHandle = rs
}
chunkconfig = getChunkConfig c