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Joey Hess 2013-07-09 15:08:59 -04:00
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doc/automatic_conflict_resolution.mdwn Normal file
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Running `git annex sync` or using the [[assistant]] involves merging
changes from elsewhere into your repository's currently checked out branch.
This could lead to a merge conflict, perhaps because the same file
got changed in two different ways. A nice feature is that these
merge conflicts are automatically resolved, rather than leaving
git in the middle of a conflicted merge, which would prevent further
syncing from happening.
When a conflict occurs, there will be several messages printed about the merge
conflict, and the file that has the merge conflict will be renamed, with
".variant-XXX" tacked onto it. So if there are two versions of file foo,
you might end up with "foo.variant-AAA" and "foo.variant-BBB". It's then
up to you to decide what to do with these two files. Perhaps you can
manually combine them back into a single file. Or perhaps you choose to
rename them to better names and keep two versions, or delete one version
you don't want.
The "AAA" and "BBB" in the above example are essentially arbitrary
(technically they are the MD5 checksum of the key). The automatic merge
conflict resoltuion is designed so that if two or more repositories both get
a merge conflict, and resolve it, the resolved repositories will not
themselves conflict. This is why it doesn't use something nicer, like
perhaps the name of the remote that the file came from.

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doc/sync.mdwn
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@ -17,10 +17,11 @@ Breitner. The idea is to have a branch `synced/master` (actually,
as a drop-point for other repositories to use to push changes. as a drop-point for other repositories to use to push changes.
When you run `git annex sync`, it merges the `synced/master` branch When you run `git annex sync`, it merges the `synced/master` branch
into `master`, receiving anything that's been pushed to it. Then it into `master`, receiving anything that's been pushed to it. (If there is a
fetches from each remote, and merges in any changes that have been made conflict in this merge, [[automatic_conflict_resolution]] is used to
to the remotes too. Finally, it updates `synced/master` to reflect the new resolve it). Then it fetches from each remote, and merges in any changes that
state of `master`, and pushes it out to each of the remotes. have been made to the remotes too. Finally, it updates `synced/master`
to reflect the new state of `master`, and pushes it out to each of the remotes.
This way, changes propagate around between repositories as `git annex sync` This way, changes propagate around between repositories as `git annex sync`
is run on each of them. Every repository does not need to be able to talk is run on each of them. Every repository does not need to be able to talk
@ -35,23 +36,3 @@ The workflow for using `git annex sync` is simple:
* Run `git annex sync` to save the changes. * Run `git annex sync` to save the changes.
* Next time you're working on a different clone of that repository, * Next time you're working on a different clone of that repository,
run `git annex sync` to update it. run `git annex sync` to update it.
## automatic merge conflict resolution
The sync process involves merging a branch into your currently checked out
branch. This could lead to a merge conflict, perhaps because the same file
got changed in two different ways. An extra feature of `git annex sync` is
that it automatically resolves these merge conflicts, rather than leaving
git in the middle of a conflicted merge.
If this occurs, there will be several messages printed about the merge
conflict, and the file that has the merge conflict will be renamed, with
".variant-XXX" tacked onto it. So if there are two versions of file foo,
you might end up with "foo.variant-AAA" and "foo.variant-BBB". It's then
up to you to decide what to do with these two files. Perhaps you can
manually combine them back into a single file. Or perhaps you choose to
rename them to better names and keep two versions, or delete one version
you don't want.
The "AAA" and "BBB" in the above example are essentially arbitrary
(technically they are the MD5 checksum of the key).