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Adding Packages
Snoing allows multiple versions of the same package with each version being a separate class. All packages including each version are automatically loaded by snoing from the versions folder. Hence for a package to be registered in snoing it must be defined in the versions folder.
Note however that typically different versions of a package will share much of the same code to install it, hence the packages folder contains the shared version independent code.
Snoing packages are split into two broad types, those that can be installed locally LocalPackages and those that must be (or are best) installed on the system SystemPackages. When adding a new package you must first decide what type it is.
System packages are further specialised into LibraryPackage and ComandPackage, the former will search the system for a library and try to link whilst the latter will attempt to run a command. New packages can easily extend these and usually only require a correct constructor (or __init__).
Local packages i.e. those that can and will be installed to the install folder by snoing must extend LocalPackage and have the following functions defined:
def GetDependencies( self ):
""" Return the dependency names as a list of names."""
pass
def _IsDownloaded( self ):
""" Check if package is downloaded."""
return False
def _IsInstalled( self ):
""" Check if package is installed."""
return False
def _Download( self ):
""" Derived classes should override this to download the package.."""
pass
def _Install( self ):
""" Derived classes should override this to install the package, should install only when finished."""
passIt is advised that the packages make extensive use of the PackageUtil functions.
To make a package dependent on another, simply add the package name to the list of dependencies returned by the GetDependencies method. For example this is the standard list of root dependencies:
[ "make", "g++", "gcc", "ld", "X11", "Xpm", "Xft", "Xext", "python", ["python-dev", "python-dev-2.4"] ]Note that root will accept either python-dev or python-dev-2.4 with the preference being python-dev.