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Joey Hess 2020-06-26 13:54:23 -04:00
parent 3175015d1b
commit b316a85ede
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19
doc/todo/lockContent_for_special_remotes.mdwn
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@ -7,12 +7,21 @@ special remotes can lock content though:
* web can't drop content, so content is also implicitly locked there * web can't drop content, so content is also implicitly locked there
(of course web is often untrusted so git-annex won't count it as a copy (of course web is often untrusted so git-annex won't count it as a copy
anyway then) anyway then)
* appendonly remotes can't drop content. This includes S3 repos configured
with versioning. It would be worth either giving all such remotes a
lockContent that succeeds noop, or just checking for appendonly the same
places lockContent is used.
* directory could use fcntl locking
* adb could use some shell trick perhaps * adb could use some shell trick perhaps
* It might be possible for an external remote to lock content, but it would * It might be possible for an external remote to lock content, but it would
be a tricky extension to the protocol, since lockContent needs to keep it be a tricky extension to the protocol, since lockContent needs to keep it
locked while running another action. locked while running another action.
* directory could use fcntl locking
This would need a transition, because dropping from directory first needs
to support checking for locks. Only after we're sure that any git-annex
binaries that might be in use on a machine do that is it safe for
lockContent to take the lock. So git-annex would need to be released with
the first change, then wait several months or years before making the
second change.
Also, the directory might be on a filesystem that does not support
locking, with various failure modes. And unlike a git-annex repo,
there's nowhere in a directory special remote to record information about
locking problems with it. Getting this right seems hard..