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How To Add MIME-Types

MIME-types define different file types allowing the operating system to deal with them correctly. Many generic file types are already defined in Puppy such as Jpegs and Mp3s. These are defined by XML description files in the freedesktop.org's package shared-mime-info. If a program only uses generic file-types then there is no need to add a MIME-type, but associate a current MIME-type to that program.

Add new MIME-Type - using update-mime-database
Note: this method cannot be used in standard Puppy, see below.
A program can provide extra MIME-type information by having an XML description file in /usr/share/mime/packages/
For example this is Audacity's, /usr/share/mime/packages/audacity.xml
<?xml version="1.0" encoding="UTF-8"?>
<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
  <mime-type type="application/x-audacity-project">
    <sub-class-of type="text/xml"/>
    <comment>Audacity project</comment>
    <glob pattern="*.aup"/>
  </mime-type>
</mime-info>

This information is then added to various files in /usr/share/mime using the command update-mime-database (files updated include globs, globs2, magic, subclasses, aliases, icons, generic-icons, XMLnamespaces and mime.cache)
This method can't be used in standard Puppy as the XML descriptions in /usr/share/mime/...(various directories) and the update-mime-database command have been removed (although they are in the devx sfs). This saves about 2.5Mb of space. Running update-mime-database without the XML descriptions will remove most of your MIME-types stored in globs, globs2 etc. To add a MIME-type without needing add all descriptions see below.

Add new MIME-Type - without using update-mime-database
All ROX needs is an extra line adding to various files in /usr/share/mime (minimally just globs). The echo and >> commands can do this. For example, observing update-mime-database on audacity.xml the equilavent code is:
#add mime-type (without using update-mime-database)
echo application/x-audacity-project:*.aup >> /usr/share/mime/globs
echo 50:application/x-audacity-project:*.aup >> /usr/share/mime/globs2
echo application/x-audacity-project text/xml >> /usr/share/mime/subclasses
echo application/x-audacity-project >> /usr/share/mime/types

This code can be added to the pinstall.sh file in a PET package. The following code removes the lines added, which can be put in puninstall.sh (take care as mistakes can break MIME-Types):
#remove mime-type on uninstall (without using update-mime-database)
sed -i '/application\/x-audacity-project:\*.aup$/ d' /usr/share/mime/globs
sed -i '/50:application\/x-audacity-project:\*.aup$/ d' /usr/share/mime/globs2
sed -i '/application\/x-audacity-project text\/xml$/ d' /usr/share/mime/subclasses
sed -i '/application\/x-audacity-project$/ d' /usr/share/mime/types

You should still include the XML MIME-type description, otherwise if update-mime-database is used the added lines will be removed but new description written.

Also see
AssociateFiles - How Associate filetypes
Internet Media Types


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