Wednesday, April 9, 2008

Gotcha with git-svn dcommit?

http://kerneltrap.org/mailarchive/git/2007/8/21/255431: this should be kept in mind/verified when using git-svn.


Tracking multiple branches in svn repo with git-svn

For some time now, have wanted to use git and git-svn to track the subversion repo at work. That repo has lots of branches, and individual changesets are merged very often between branches, making it a nightmare to find out what has already been merged, and what not.
Used to keep track of all this in a text file. Its becoming tedious. Have been trying to use git-svn to ease the pain.
On the first try, git-svn gave up halfway during the clone operation with an error message about protocol/network error. This git-svn was the one in ubuntu repositories.
Since then, installed git from source.
First I tried this way. It works, but then gitk will only show me one branch: the one I have currently checked out.
Now, I am trying this other way. Hopefully this will work better.

Saturday, April 5, 2008

Code merging

Wanting to merge two branches of code, both of which have had concurrent commits going on them for some time. Code is kept in svn, so the branches actually live in separate directories. Most changesets have been merged back and forth, yet residual changes remain.

I get diff to tell the files which are different between the branches.

diff -q -r -x '\.svn' -x '*.pyx' -x '*~' branch1 branch2


This produces lines like:



Files zeroc-ice-python_3.2.1/config/Make.rules and zeroc-ice-python-3.2.1-new/config/Make.rules differ
Only in zeroc-ice-python-3.2.1-new/config: Make.rules.GNU
Only in zeroc-ice-python-3.2.1-new/config: Make.rules.GNU_kFreeBSD

I need to munge the output of diff. I want to have 4 columns: directory (sans the branchname), filename, link to the file in branch1 if it exists there, link to file in branch2 if it exists there. I want this ordered/sorted by directory, and I want the output in emacs org mode format. I filter the output of the above diff command through this perl script:


while (<>) {
if (/^Only in/) {
m/Only in (.*): (.*)$/; $dirname=$1; $fname=$2; # sep dirpath and filename
($branch = $dirname) =~ s/([^\/]+).*/$1/; # the branch name is the first part of the dirpath (e.g. branch-xy/dir/path/file)
$dirname =~ s/$branch\/?(.*)/$1/; # remove the 'branch-xy' from dirpath to get the remaining dirpath
$_ = "| $dirname/$fname | [[file:~/workspace/couffable/branches/$branch/$dirname/$fname][Only in: $branch]] |";
}

if (/^Files /) {
m/Files (.*) and (.*) differ/; $left=$1;
$left =~ m/release-3-11\/(.*\/)?([^\/]+)/;
if (defined($1)) { $dirname=$1; } else { $dirname = ""; }
$left=$2; # remove branch name, sep dir and file
$_ = "| $dirname$left | [[file:~/workspace/couffable/branches/release-3-11/$dirname$left][r311]] | [[file:~/workspace/couffable/branches/release-3-11-airtel/$dirname$left][r311-airtel]] |";
}
print $_ . "\n";
}

Friday, April 4, 2008

Tesla = Pylons + SQLAlchemy + Elixir

Tesla is a Paster template creating Pylons applications using SQLAlchemy/Elixir ORM. Adds some simple database paster commands. Includes the following features:


  1. Create model classes

  2. Simple database commands (create/drop tables)

  3. Migrations (using SoC migrate library)

  4. Create and run batch scripts

  5. Handles SQLAlchemy setup and session refresh


Now, will Tesla/Elixir allow me to have composite primary keys of my choosing? Can I have, for most models, an Elixir definition, and for some, a more flexible SQLAlchemy mapper? How?


The reason I'd like to do that is: ActiveRecord does a poor job of structuring database tables for performance


What a bunch of libraries! Sometimes you wonder if plain PHP with embedded SQL isn't better after all. No, no, that was heresy...

Tuesday, April 1, 2008

Blogging from GNOME Blog

After several futile attempts at blogging from within Emacs to Blogger.com, I found the GNOME Blog applet and am using it now. It is not emacs, but at least it is less clunky than the blogspot web interface.