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pre-commit: Update direct mode mappings.

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Making the pre-commit hook look at git diff-index to find changed direct
mode files and update the mappings works pretty well.

One case where it does not work is when a file is git annex added, and then
git rmed, and then this is committed. That's a no-op commit, so the hook
probably doesn't even run, and it certianly never notices that the file
was deleted, so the mapping will still have the original filename in it.

For this and other reasons, it's important that the mappings still be
treated as possibly inconsistent.

Also, the assistant now allows the pre-commit hook to run when in direct
mode, so the mappings also get updated there.
This commit is contained in:
Joey Hess 2013-02-06 12:40:59 -04:00
parent ceb732bea7
commit 547d7745fb
8 changed files with 75 additions and 33 deletions
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12
doc/design/assistant/desymlink.mdwn
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@ -58,9 +58,9 @@ is converted to a real file when it becomes present.
This allows just cloning one of these repositories normally, and then
as the files are synced in, they become real files.
* Maintain a local mapping from keys to files in the tree. This is needed
when sending/receiving keys to know what file to access. Note that a key
can map to multiple files. And that when a file is deleted or moved, the
mapping needs to be updated.
when sending/receiving/dropping keys to know what file to access.
Note that a key can map to multiple files. And that when a file is
deleted or moved, the mapping needs to be updated.
* May need a reverse mapping, from files in the tree to keys? TBD
(Currently, getting by looking up symlinks using `git cat-file`)
(Needed to make things like `git annex drop` that want to map from the
@ -87,12 +87,6 @@ is converted to a real file when it becomes present.
* kqueue does not deliver an event when an existing file is modified.
This doesn't affect OSX, which uses FSEvents now, but it makes direct
mode assistant not 100% on other BSD's.
* The mapping is not updated when files are deleted (or for the deletion
part of a rename). So it can contain old filenames that are no longer in
use. Code that uses the mapping has to take care to check that the
files they refer to exists, which is a good idea anyway. But,
it would be good to at some point update the mappings to remove deleted
files (fsck does this FWIW).
## done