[Tfug] Version Control

[Yan]

So, a quick intrusion into this flame(ish)war:

1. There was a question raised about git on large repositories. The linux
kernel has something like 15 million lines of code. It's in git. There are
available git repositories for Chromium and Mozilla (although, IIRC, the
actual development work is done in SVN and Mercurial, respectively).
However, people *do* complain that git doesn't do well with "very large"
repositories. Not sure how large, but pretty freaking large.

2. A single, general diff for any type of file is a somewhat of a crazy
pipedream. However, git tries:

# git difftool -y -x /path/to/a/differ somefile

For example:

# git init
Initialized empty Git repository in /home/yans/t/.git/
# echo one > a
# git add a
# git commit -m "first version" a
[master (root-commit) b37b0fb] first version
 1 file changed, 1 insertion(+)
 create mode 100644 a
# echo two > a

# git difftool -y -x /usr/bin/diff a
1c1
< one
---
> two

# git difftool -y -x /usr/bin/wc a
1 1 4 /tmp/JjEC1R_a
1 1 4 a
2 2 8 total

# git difftool -y -x /bin/echo a
/tmp/n7tVrk_a a

This doesn't make any assumptions about the content of the file, of course.
So if you had a video file in git and a video diffing utility installed in
/usr/bin/magic_video_diff, you would do:

# git difftool -y -x /usr/bin/magic_video_diff myvideo.ogv

You can further specify the specific revisions to diff and so forth, but
you can read the manpage for that :-). I think that's probably almost as
close as you can get with a VCS.


- Yan



On Wed, Mar 27, 2013 at 7:19 PM, Glen Pfeiffer <glen at thepfeiffers.net>wrote:

> On 27 Mar 2013, Bexley Hall wrote:
> > > If you are looking for a monithilic VCS that internally knows
> > > about every imaginable file type ever created, or envisioned,
> > > I suggest that you seek suggestions from somewhere other than
> > > a Unix mailing group.
> >
> > I didn't ask for a VCS that did all of those things.
>
> You may not have meant to say that, but that is exactly what it
> sounds like you asked for.
>
>
> > But, I sure as hell don't want a VCS that thinks everything
> > other than "source code written in USASCII" is not worth
> > versioning!
>
> No one said that these version control systems won't version
> anything except for code written in USASCII.
>
> Do you realize that you have changed your requirements at least
> two times since you started this thread?
>
> At this point you would probably answer your question faster if
> you used all this time and energy to actually test out the VCS
> systems available instead of arguing with what we are telling
> you.
>
> --
> Glen
>
>
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