[dnm] UID/GID mapping does not quite work#221
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I've tried to rework the UID/GID mapping that @ezrizhu started, and it almost works using the stock
newuidmap/newgidmapfeatures, but I'm stuck---I can't get the group mapping to actually let me work withapt, which was kind of the point. (I think we want to setallowin/proc/UNSHARE/setgroups, but neither the parent nor the forked unshare can write there.) If folks want to talk it out, happy to do so!