#171: converting darcs' darcs to git results in a corrupted repo
----------------------+-----------------------------------------------------
Reporter: vmiklos | Owner: lele
Type: defect | Status: new
Priority: major | Milestone: VersionOne
Component: tailor | Version: 0.9
Resolution: | Keywords:
----------------------+-----------------------------------------------------
Old description:
> Hi,
>
> Here is the config I used:
>
> $ cat config
> [DEFAULT]
> encoding-errors-policy = replace
>
> [sandbox]
> source = darcs:sandbox
> target = git:sandbox
>
> [darcs:sandbox]
> subdir = darcs
> repository = /path/to/sandbox
>
> [git:sandbox]
> subdir = git
> repository = /path/to/sandbox.git
>
> Where sandbox is http://code.haskell.org/darcs/big-zoo/darcs-
> repo-2008-10-31.tar.bz2
>
> I started the conversion in non-verbose mode, it converted 6422 of 6548
> changesets and exited without any error. As I guessed, the result does
> not match the original repo.
>
> Given that the repo is public, I hope you can reproduce the error.
>
> Sadly I'm not sure where the error occures, the conversion took 373
> minutes on my machine.
>
> $ darcs --version
> 2.1.2 (+ 266 patches)
>
> $ git --version
> git version 1.6.0.1
>
> I am using darcs from the darcs repo (and not the latest release) as I
> had other problems and the suggested fix on the mailing list was to use
> the version from the repo.
>
> If I missed any important info, please let me know.
>
> Thanks.
New description:
Hi,
Here is the config I used:
$ cat config
{{{
[DEFAULT]
encoding-errors-policy = replace
[sandbox]
source = darcs:sandbox
target = git:sandbox
[darcs:sandbox]
subdir = darcs
repository = /path/to/sandbox
[git:sandbox]
subdir = git
repository = /path/to/sandbox.git
}}}
Where sandbox is http://code.haskell.org/darcs/big-zoo/darcs-
repo-2008-10-31.tar.bz2
I started the conversion in non-verbose mode, it converted 6422 of 6548
changesets and exited without any error. As I guessed, the result does not
match the original repo.
Given that the repo is public, I hope you can reproduce the error.
Sadly I'm not sure where the error occures, the conversion took 373
minutes on my machine.
$ darcs --version
2.1.2 (+ 266 patches)
$ git --version
git version 1.6.0.1
I am using darcs from the darcs repo (and not the latest release) as I had
other problems and the suggested fix on the mailing list was to use the
version from the repo.
If I missed any important info, please let me know.
Thanks.
--
Comment(by lele):
I tried this out, and I clearly see something went wrong, although I can't
say in which way...
First of all, it took more than 20 hours here to complete the migration,
on a dual core AMD64 with 2Gb of RAM...
Tailor completed its task without errors, effectively producing 6422 git
changesets out of 6548 darcs changesets. I do not have time right now to
investigate further, but I bet that many of the "missing" changes are
related to darcs operations that have no impact on the source tree, such
as setprefs for example.
What makes me sad is seeing the huge difference in the resulting trees:
looking at the root directory alone, the darcs side contains just 20
entries while there are 45 in the git side. Quickly inspecting one entry,
"/darcs-createrepo.lhs" I see that
{{{
$ darcs cha --count --match 'touch darcs-createrepo.lhs'
27
}}}
while
{{{
$ git log darcs-createrepo.lhs |grep '^commit ' | wc -l
23
}}}
and apparently the last patch that touched it, effectively removing the
file, did not have the right effect on the git side:
{{{
2008-11-30 11:20:42 INFO: Upstream revision "resolve conflicts" by
Tommy Pettersson <[EMAIL PROTECTED]>, 2006-02-19 21:32:18+00:00
2008-11-30 11:20:42 INFO: /tmp/t171/darcs $ darcs pull --all --quiet
--match "hash 20060219213218-145ad-
ce338c2967cf6eef00b0907cfa0f35d52005e547.gz" 2>&1
2008-11-30 11:20:57 INFO: [Ok]
2008-11-30 11:20:57 INFO: /tmp/t171/darcs $ darcs changes --match
"hash 20060219213218-145ad-ce338c2967cf6eef00b0907cfa0f35d52005e547.gz"
--xml-output --summ
2008-11-30 11:20:57 INFO: [Ok]
2008-11-30 11:20:57 INFO: $ rsync --archive --exclude _darcs --exclude
.git /tmp/t171/darcs/ /tmp/t171/git
2008-11-30 11:20:57 INFO: [Ok]
2008-11-30 11:20:57 INFO: /tmp/t171/git $ git update-index Add.lhs
Apply.lhs Depends.lhs PatchMatch.lhs RepoFormat.lhs best_practices.tex
2008-11-30 11:20:57 INFO: [Ok]
2008-11-30 11:20:57 INFO: /tmp/t171/git $ git update-index --remove
darcs-createrepo.lhs
2008-11-30 11:20:57 INFO: [Ok]
2008-11-30 11:20:57 INFO: /tmp/t171/git $ git update-index darcs.lhs
2008-11-30 11:20:57 INFO: [Ok]
2008-11-30 11:20:57 INFO: /tmp/t171/git $ git status
2008-11-30 11:20:57 INFO: [Ok]
2008-11-30 11:20:57 INFO: /tmp/t171/git $ git add -u
2008-11-30 11:20:57 INFO: [Ok]
2008-11-30 11:20:57 INFO: /tmp/t171/git $ git write-tree
2008-11-30 11:20:57 INFO: [Ok]
2008-11-30 11:20:57 INFO: /tmp/t171/git $ git rev-parse HEAD 2>&1
2008-11-30 11:20:57 INFO: [Ok]
2008-11-30 11:20:57 INFO: /tmp/t171/git $ git commit-tree
27bda32db3e19eaa4c9fe05a06b63c8861bc8505 -p
c84c434ef261a767924e9eccf39d31e3b1842bc0
2008-11-30 11:20:57 INFO: [Ok]
2008-11-30 11:20:57 INFO: /tmp/t171/git $ git update-ref HEAD
6f324cea4291855525d71cd978fb186454177d6a
c84c434ef261a767924e9eccf39d31e3b1842bc0
2008-11-30 11:20:57 INFO: [Ok]
}}}
--
Ticket URL: <http://progetti.arstecnica.it/tailor/ticket/171#comment:1>
Tailor <http://progetti.arstecnica.it/tailor>
An inter-VCs changeset exchanger
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