Mark H Weaver <mhw@netris.org> skribis:

> In /nix/store/n670kdk9ysi9jlq3f6ki4glc34p35dc1-module-import/guix/build/union.scm:
>  202: 9 [union-build "/nix/store/dn29z8fpkh33sxgwwbxg0cn7ih523v65-profile" # # ...]
>  102: 8 [loop #]
> In srfi/srfi-1.scm:
>  578: 7 [map #<procedure loop (tree)> (# # # # ...)]
> In /nix/store/n670kdk9ysi9jlq3f6ki4glc34p35dc1-module-import/guix/build/union.scm:
>  101: 6 [loop #]
> In srfi/srfi-1.scm:
>  578: 5 [map #<procedure resolve-collision (leaves)> (# # # # ...)]
> In /nix/store/n670kdk9ysi9jlq3f6ki4glc34p35dc1-module-import/guix/build/union.scm:
>  187: 4 [resolve-collision #]
> In ice-9/boot-9.scm:
>  793: 3 [call-with-input-file "/nix/store/25mp69n6i16b308sbyh42ic3qzld46li-ncurses-5.9/lib/terminfo" ...]
>  793: 2 [call-with-input-file "/nix/store/y9q8dwgs8lxww2khkk1hfji1jihkfcz3-ncurses-5.9/lib/terminfo" ...]
> In /nix/store/n670kdk9ysi9jlq3f6ki4glc34p35dc1-module-import/guix/build/union.scm:
>  116: 1 [#<procedure 10469fb0 at /nix/store/n670kdk9ysi9jlq3f6ki4glc34p35dc1-module-import/guix/build/union.scm:111:13 (port2)> #<input: /nix/store/y9q8dwgs8lxww2khkk1hfji1jihkfcz3-ncurses-5.9/lib/terminfo 7>]
> In unknown file:
>    ?: 0 [get-bytevector-n! #<input: /nix/store/25mp69n6i16b308sbyh42ic3qzld46li-ncurses-5.9/lib/terminfo 6> ...]
>
> ERROR: In procedure get-bytevector-n!:
> ERROR: In procedure fport_fill_input: Is a directory

The ‘lib/terminfo’ directory is apparently provided by two or more
packages, so there’s a collision, leading to a ‘resolve-collision’ call,
which in turns call ‘file=?’, which is not prepared to deal with
directories.

This patch should fix it: