[Nix-dev] Strange file in the manifest

[Lluís Batlle]

I get:
the following paths will be downloaded/copied (0.00 MiB):
  /nix/store/0z992bwxpi5r1wyahdzsnv186vklq52z-sed-4.1.5.tar.gz
substituting path
`/nix/store/0z992bwxpi5r1wyahdzsnv186vklq52z-sed-4.1.5.tar.gz' using
substituter `/nix/store/j6h48xsggh1x2ps0dsffpnkh7ipxb5b0-nix-0.14pre18861/libexec/nix/substituters/download-using-manifests.pl'
...
  unpacking archive...
bunzip2: (stdin) is not a bzip2 file.
error: unexpected end-of-file
cannot unpack `/nix/store/z6803hy26myal4hnfkrhly0mn78hkld6-0z992bwxpi5r1wyahdzsnv186vklq52z-sed-4.1.5.tar.gz'
into `/nix/store/0z992bwxpi5r1wyahdzsnv186vklq52z-sed-4.1.5.tar.gz' at
/nix/store/j6h48xsggh1x2ps0dsffpnkh7ipxb5b0-nix-0.14pre18861/libexec/nix/substituters/download-using-manifests.pl
line 345.


Looking at the file contents served in hydra, it has an hydra
generated html page. It has the text:
<li><div class="error-msg">Path /nix/store/0z992bwxpi5r1wyahdzsnv186vklq52z-
sed-4.1.5.tar.gz is no longer available.</div></li>

How did this happen?