[yocto] Forcing fetch task when source changes

[Vuille, Martin (Martin)]

I have defined a class with a customized fetch task (that
copies files from a local read-only directory to the ${S}
directory).

I am looking for a way to cause the fetch task to run
again whenever the contents of the local directory
change w.r.t. what was last fetched/copied to ${S}.

Is there a way to do that?

MV
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