Re: git fast-export | git fast-import doesn't work

From: Ondrej Certik <ondrej@certik.cz>
Date: Nov 26, 2008, 10:18 UTC
Message-ID: <85b5c3130811260218s7529914eyb56a05ec1ca34b8f@mail.gmail.com>
In-Reply-To: <85b5c3130811260135g4646bf72iaf57f599fdd21a0c@mail.gmail.com>

On Wed, Nov 26, 2008 at 10:35 AM, Ondrej Certik <ondrej@certik.cz> wrote:

Show 26 quoted lines

> On Wed, Nov 26, 2008 at 1:14 AM, Johannes Schindelin
> <Johannes.Schindelin@gmx.de> wrote:
>> Hi,
>>
>> On Tue, 25 Nov 2008, Ondrej Certik wrote:
>>
>>> I would like to export our whole git repository to patches, and then
>>> reconstruct it again from scratch. Following the man page of "git
>>> fast-export":
>>>
>>> [...]
>>>
>>> However, the repository is very different to the original one. It
>>> contains only 191 patches:
>>
>> Can you try again with a Git version that contains the commit
>> 2075ffb5(fast-export: use an unsorted string list for extra_refs)?
>
> I tried the next branch:
>
> $ git --version
> git version 1.6.0.4.1060.g9433b
>
> that contains the 2075ffb5 patch. I haven't observed any change ---
> the "git log" still only shows 191 commits (git log --all shows
> everything).

I deleted all tags and then fast-exported and imported, now all the commits show in "git log", however, the patches are wrongly connected. Basically, both repositories are identical (including hashes) up to this commit:

d717177d4  (fixed downloads instructions in the README and a typo)

However, the original repo (sympy-full-history-20081023) contains 3 children at this commit:

Parent: fecac34251934e98a05631440d3ce151585f2391 (David added to credits)
Child:  03ccb60798d62f94ac9d2ec9472dc7333f67b420 (Allow to specify
line width in 2D plotting.)
Child:  203124d834488781db5429d941eeb60e396990c8 (credits improvements)
Child:  77146885f1b7aa49184f27c2297488c3d1201106 (Speed "import sympy"
up as in the last release.)

but the newly created repository only 2:

Parent: fecac34251934e98a05631440d3ce151585f2391 (David added to credits)
Child:  203124d834488781db5429d941eeb60e396990c8 (credits improvements)
Child:  77146885f1b7aa49184f27c2297488c3d1201106 (Speed "import sympy"
up as in the last release.)

And from that point on, the hashes mishmatch and sometimes the commits are just wrongly connected (e.g. for example d2dc6b3's parent is 0adafe3, but 0adafe3 was committed half a year later after d2dc6b3...), so it's a mess. Also the checkouted files are not complete.

Now, if you look at the "patches" file, to which I saved the results of "git fast-export", you can find that the commit d717177d4 (fixed downloads instructions in the README and a typo) has the mark :6540, and if you search for this mark in the patches file, you can only find 2 children:

commit refs/heads/master mark :6542 author Ondrej Certik <ondrej@certik.cz> 1198803347 +0100 committer Ondrej Certik <ondrej@certik.cz> 1198803347 +0100 data 21 credits improvements from :6540 M 100644 :6541 README

and:

commit refs/heads/master mark :6551 author Ondrej Certik <ondrej@certik.cz> 1198951670 +0100 committer Ondrej Certik <ondrej@certik.cz> 1198951670 +0100 data 48 Speed "import sympy" up as in the last release. from :6540 M 100644 :6550 sympy/printing/preview.py

however, the third child doesn't contain the "from :6540":

commit refs/heads/master mark :24 author Ondrej Certik <ondrej@certik.cz> 1198798384 +0100 committer Ondrej Certik <ondrej@certik.cz> 1198798384 +0100 data 101 Allow to specify line width in 2D plotting.

So imho that's a bug in git fast-export. What do you think?

Ondrej