[Buildbot-devel] how to use environment variable in build step

[Hendryk Bockelmann]

I am using a simple BuildFactory to perform some shell scripts on my 
build-slave, ie. the master.cfg looks like:

my_fac = factory.BuildFactory()
my_fac.addStep(shell.ShellCommand(description='run test 1',
                                   command=["/home/user/scripts/foo.sh", 
"--with-option=1"],
                                   workdir="/tmp/buildbot"))

To be more flexible in my builds, I would like to replace the absolute 
paths in the ShellCommand and use s.th. like

my_fac = factory.BuildFactory()
my_fac.addStep(shell.ShellCommand(description='run test 1',
                                   command=["$HOME/scripts/foo.sh", 
"--with-option=1"],
                                   workdir="$WORK"))

where the HOME and WORK environment vars are already setup on each 
buildslave ... but unfortunately the environment vars do not get 
expanded when the build runs. So where is my mistake?
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