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-rw-r--r--Documentation/howto/recover-corrupted-blob-object.txt14
1 files changed, 12 insertions, 2 deletions
diff --git a/Documentation/howto/recover-corrupted-blob-object.txt b/Documentation/howto/recover-corrupted-blob-object.txt
index 323b513ed0..6d362ceb10 100644
--- a/Documentation/howto/recover-corrupted-blob-object.txt
+++ b/Documentation/howto/recover-corrupted-blob-object.txt
@@ -3,18 +3,24 @@ From: Linus Torvalds <torvalds@linux-foundation.org>
Subject: corrupt object on git-gc
Abstract: Some tricks to reconstruct blob objects in order to fix
a corrupted repository.
+Content-type: text/asciidoc
+How to recover a corrupted blob object
+======================================
+
+-----------------------------------------------------------
On Fri, 9 Nov 2007, Yossi Leybovich wrote:
>
> Did not help still the repository look for this object?
> Any one know how can I track this object and understand which file is it
+-----------------------------------------------------------
So exactly *because* the SHA1 hash is cryptographically secure, the hash
itself doesn't actually tell you anything, in order to fix a corrupt
object you basically have to find the "original source" for it.
The easiest way to do that is almost always to have backups, and find the
-same object somewhere else. Backups really are a good idea, and git makes
+same object somewhere else. Backups really are a good idea, and Git makes
it pretty easy (if nothing else, just clone the repository somewhere else,
and make sure that you do *not* use a hard-linked clone, and preferably
not the same disk/machine).
@@ -31,19 +37,23 @@ original object, so right now the corrupt object is useless, but it's very
interesting for the future, in the hope that you can re-create a
non-corrupt version.
+-----------------------------------------------------------
So:
> ib]$ mv .git/objects/4b/9458b3786228369c63936db65827de3cc06200 ../
+-----------------------------------------------------------
This is the right thing to do, although it's usually best to save it under
it's full SHA1 name (you just dropped the "4b" from the result ;).
Let's see what that tells us:
+-----------------------------------------------------------
> ib]$ git-fsck --full
> broken link from tree 2d9263c6d23595e7cb2a21e5ebbb53655278dff8
> to blob 4b9458b3786228369c63936db65827de3cc06200
> missing blob 4b9458b3786228369c63936db65827de3cc06200
+-----------------------------------------------------------
Ok, I removed the "dangling commit" messages, because they are just
messages about the fact that you probably have rebased etc, so they're not
@@ -124,7 +134,7 @@ and your repository is good again!
git log --raw --all
and just looked for the sha of the missing object (4b9458b..) in that
-whole thing. It's up to you - git does *have* a lot of information, it is
+whole thing. It's up to you - Git does *have* a lot of information, it is
just missing one particular blob version.
Trying to recreate trees and especially commits is *much* harder. So you