[Python] How to find absolute path in Scons site_tools

I'm running into problems with the difference in environment between SConscripts and custom tools under site_tools.

I'm trying to find the absolute path of a string, which is fine in SConscript:

print File('#something').get_abspath()
>> /home/projects/something


Similar code in site_tools:

from SCons.Node.FS import File
print File('#something').get_abspath()
>> TypeError: __init__() takes exactly 4 arguments (2 given)


So clearly the File() constructed in SConscript is not a SCons.Node.FS.File.

So the questions are:

1) What is the File object in a SConscript, and how can I get one in a builder/site_tools?

2) How can I get the absolute path in site_tools? I need this because I'm constructing command-line arguments for tools which need absolute paths.

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