If there are alternatives I haven't thought of, please let me know. I'd
be amenable to having a file included in the source tree so it isn't
hard-coded in *source*, just in a text file, but at this point it seems
like six of one and half a dozen of the other. (as in: two solutions but
same end result - the Horizon Git tree has to be updated with every
adelie-base modification.)

 Not if the Horizon build system automatically fetches the passwd file
in the adelie-base tree.

 I'll see myself out.