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more design work

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Joey Hess 2014-11-12 14:02:33 -04:00
parent 12267089f0
commit 3dea8f0533
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24
doc/todo/direct_mode_undo.mdwn
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@ -6,26 +6,36 @@ mode first, which can range from annoying to really annoying to impossible
## general approach
`git annex foo $gitcmd` could:
`git annex proxy $gitcmd` could:
1. check out a local clone of the repo
2. run "git $gitcmd" inside the cline
3. merge any changes from the clone back into the direct mode repo
2. run "git $gitcmd" inside the clone
3. Merge any changes from the clone back into the direct mode repo
and update the work tree the same as is done by `git annex merge`.
4. If a different branch was checked out in the clone, update the repo
to have that same branch checked out.
This is a general bypass for the direct mode guard. It should work anywhere
(even on FAT). It avoids problems like `git commit -a` being unsafe in
direct mode, since running such a command in a local clone, which does not
use direct mode is always safe.
Beyond handling undo, #4 means that this can be used to check
out past versions of the repo (eg, `git annex proxy checkout HEAD^^`)
One problem with it is that it can only operate on changes that have been
committed. If you've just accidentially deleted a file and want to undo
that, and haven't run `git annex sync` to commit it, you can't revert it.
Also, while this is general, I don't know if the generality is useful.
What other changes, than revert, would it make sense to do with such a
command? It could be used to check out some other branch, but step 3 above
would merge that branch back into the direct mode repo.
The need to make a local clone will make it a bit slow, since the whole
work tree will need to be set up. It might be possible to reuse the clone
next time (after resetting it to reflect the current HEAD).
Some things like the reflog and local branches don't get cloned, so
git commands that try to act on those wouldn't work. Maybe it would be
better to make it use a separate work tree, but the same .git directory?
Then step #3 would instead update the direct mode work tree to refect
the new HEAD, and step #4 would not be needed.
## git annex undo