git: fatal error: `chdir’ failed: permission denied.

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Problem
Trying to use the heroku gem to clone a project and do local modifications I got the following error:

Solution
It turns out that in Mandriva, when using:

what gets installed is the ‘GNU Interactive Tools’ that has nothing to do with the git version control system.
So make sure you first uninstall the git installed:

and then install the Git – Fast version control system, by doing:

You should then be able to clone a heroku application:

Ext.ux.grid has no properties error

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Problem
Trying to use ExtJS with RubyOnRails on Heroku, gives the following error and a blank page in Firebug.

Solution
In Heroku, you will probably have to manually upload the files from the ExtJS library, as well as the ext_scaffold plugin.
When you do that, two files that ext_scaffold needs, and which they should be located in ext_scaffold/assets/javascripts should be copied to public/javascripts.
The files are:

Converting Paradox tables to MySQL sql in Linux

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Problem
You want to convert some legacy tables created in Paradox (.db, .px) to another format so you can use it in MySQL.

Solution
Download the px tools from here.

Follow the instructions, in the INSTALL file after you untar the file.
You should have to do the usual three step linux installation:

Afterwards to make sure that the .db file is a paradox file run:

The program should read the header and report back with something along the lines:

To export each Paradox db file to an sql statement run the following:

Installing sqlite3-ruby in Mandriva and Rails 2.0.2

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Problem
After upgrading to Rails 2.0.2 when trying to install the sqlite3-ruby gem got the following error:

Solution
In Mandriva you need to install the ruby-sqlite3 and the development libraries first, like:

After that you should be able to install the gem as normal.

Upgrading to Rails 2.0.2 problems/solutions

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Problem
Upgrading from Rails version 1.2.3 to version 2.0.2.
Following the suggestion in DH’s weblog here when using sudo gem install rails -y, it gets the trunk version of rails which at the time was 2.0.2.9216.
This causes a few problems and breaks a few more things.

Solution
In order to get back to the latest stable version, you have to uninstall a few of the gems installed from the trunk version.
If you have installed the latest version of top of an existing one using gems, then doing:

will give you all the installed versions of the gems. Something like:

Make sure you uninstall all the gems with version number 2.0.2.9216:

In each of the above commands the gem package manager should ask you to select the one you want to uninstall.
Pick the one with the 2.0.2.9216 (or other version later than 2.0.2).

At the end if you list the gems again you should only have gems going up to version 2.0.2

An extra step I had to take for making the migrations work was to install rake again:

After all these my installation seems to be working fine again.