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This commit is contained in:
Joey Hess 2013-10-20 18:00:38 -04:00
parent 300d3d34f7
commit 09127d4e49
1 changed files with 9 additions and 8 deletions

17
doc/design/assistant/disaster_recovery.mdwn
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@ -87,7 +87,7 @@ git-recover-repository command.
### detailed design
Run `git fsck` and parse output to find bad objects. Note that
Run `git fsck` and parse output to find bad objects. **done** Note that
fsck may fall over and fail to print out all bad objects, when
files are corrupt. So if the fsck exits nonzero, need to collect all
bad objects it did find, and:
@ -95,10 +95,10 @@ bad objects it did find, and:
1. If the local repository contains packs, the packs may be corrupt.
So, start by using `git unpack-objects` to unpack all
packs it can handle (which may include parts of corrupt packs)
back to loose objects. And delete all packs.
2. Delete all loose corrupt objects.
back to loose objects. And delete all packs. **done**
2. Delete all loose corrupt objects. **done**
Repeat until fsck finds no new problems.
Repeat until fsck finds no new problems. **done**
Check if there's a remote. If so, and if the bad objects are all
present on it, can simply get all bad objects from the remote,
@ -108,12 +108,13 @@ and inject them back into .git/objects to recover:
(Note: git does not seem to provide a way to fetch specific missing
objects from the remote. Also, cannot use `--reference` against
a repository with missing refs. So this seems unavoidably
network-expensive.)
5. Use git-cat-file in raw mode on the clone to dump each missing object,
and feed it into git-hash-object in the corrupt repo. (This avoids
needing to unpack packs in the clone.)
network-expensive.) **done**
5. Rsync objects over. (Turned out to work better than git-cat-file,
because we don't have to walk the graph to add missing objects.)
**done**
6. If each bad object was able to be repaired this way, we're done!
(If not, can reuse the clone for getting objects from the next remote.)
**done**
If some missing objects cannot be recovered from remotes, find commits in each
local branch that are broken by all remaining missing objects. Some of this can