This reverts commit e9a5eebc78, which
as far as I can tell breaks system roll-backs thusly:
[...]
In gnu/build/accounts.scm:
239:27 3 (_ #<<password-entry> name: "root" password: "x" uid: 0 gid: 0 real-name: "System >)
In unknown file:
2 (string-join ("root" "x" "0" "0" "System administrator" "/root" #t) ":" #<undefined>)
In ice-9/boot-9.scm:
1685:16 1 (raise-exception _ #:continuable? _)
1685:16 0 (raise-exception _ #:continuable? _)
ice-9/boot-9.scm:1685:16: In procedure raise-exception:
In procedure string-append: Wrong type (expecting string): #t
5a2c3352d8