"""SCons.Tool.ipkg

Tool-specific initialization for ipkg.

There normally shouldn't be any need to import this module directly.
It will usually be imported through the generic SCons.Tool.Tool()
selection method.

The ipkg tool calls the ipkg-build. Its only argument should be the 
packages fake_root.
"""

#
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__revision__ = "src/engine/SCons/Tool/ipkg.py  2014/03/02 14:18:15 garyo"

import os

import SCons.Builder

def generate(env):
    """Add Builders and construction variables for ipkg to an Environment."""
    try:
        bld = env['BUILDERS']['Ipkg']
    except KeyError:
        bld = SCons.Builder.Builder( action  = '$IPKGCOM',
                                     suffix  = '$IPKGSUFFIX',
                                     source_scanner = None,
                                     target_scanner = None)
        env['BUILDERS']['Ipkg'] = bld

    env['IPKG']       = 'ipkg-build'
    env['IPKGCOM']    = '$IPKG $IPKGFLAGS ${SOURCE}'
    env['IPKGUSER']   = os.popen('id -un').read().strip()
    env['IPKGGROUP']  = os.popen('id -gn').read().strip()
    env['IPKGFLAGS']  = SCons.Util.CLVar('-o $IPKGUSER -g $IPKGGROUP')
    env['IPKGSUFFIX'] = '.ipk'

def exists(env):
    return env.Detect('ipkg-build')

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