[Buildbot-devel] WithProperties() in a buildstep?

[Matthew Morse]

Hi,

I'm using properties in ShellCommand steps like:

a_step = shell.ShellCommand(
         description = "Adding buildstamp",
         descriptionDone=["Finished","adding buildstamp"],
         command = ["mv", "<foo>", WithProperties("%s-%d", "buildername", "buildnumber")],
         workdir = dir,
         haltOnFailure=True,
    )

I'd like to also use them in other sorts of steps, but apparently that isn't supported (as I read the doc: http://buildbot.net/buildbot/docs/latest/full.html#WithProperties) . For example, I'd like a source.Git step to be able to look up the branch that triggered the build: 

lagos_setup_factory.addStep(
        source.Git,
        repourl= some_url, 
        branch = WithProperties("%(the_branch)s", the_branch=determine_branch),
        mode = "clobber",
        submodules=False,
        workdir="build",
        haltOnFailure=True,
    )

But,  I'm getting errors like:

fatal: Invalid refspec '+Unpersistable('Unpersistable data: instance of class buildbot.process.properties.WithProperties deemed insecure')'

...which I think is because WithProperties isn't supported in a Git step.  Is there a workaround?

Thanks,
- Matt

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