bug#27582: artanis: ERROR throw to key 'ftp-mirror'. 550 "Failed to open file"

[Adonay Felipe Nogueira <adfeno@openmailbox.org>]

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Doing any of `guix package -i artanis`, `guix package --fallback -i
artanis`, `guix build artanis` results in the error described in the
attached .txt log file.

Interesting line in the attached .txt log file is 7.


Respectfully, Adonay.

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substitute: \rsubstitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'...   0.0%\rsubstitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'... 100.0%
building path(s) `/gnu/store/9p89jwaf4hnm0w5chfswcmfcf0v18719-artanis-0.2.1.tar.gz'
|   executing builder `builtin:download'

Starting download of /gnu/store/9p89jwaf4hnm0w5chfswcmfcf0v18719-artanis-0.2.1.tar.gz
From ftp://alpha.gnu.org/gnu/artanis/artanis-0.2.1.tar.gz...
ERROR: Throw to key `ftp-error' with args `(#<input-output: socket 14> "RETR artanis-0.2.1.tar.gz" 550 "Failed to open file.\r")'.

Starting download of /gnu/store/9p89jwaf4hnm0w5chfswcmfcf0v18719-artanis-0.2.1.tar.gz
From http://mirror.hydra.gnu.org/file/artanis-0.2.1.tar.gz/sha256/041ajcg2pz918kd9iqcj4inpzddc3impvz3r2nhlpbv8zrz011hn...
ERROR: download failed "http://mirror.hydra.gnu.org/file/artanis-0.2.1.tar.gz/sha256/041ajcg2pz918kd9iqcj4inpzddc3impvz3r2nhlpbv8zrz011hn" 404 "Not Found"

Starting download of /gnu/store/9p89jwaf4hnm0w5chfswcmfcf0v18719-artanis-0.2.1.tar.gz
From http://tarballs.nixos.org/sha256/041ajcg2pz918kd9iqcj4inpzddc3impvz3r2nhlpbv8zrz011hn...
ERROR: download failed "http://tarballs.nixos.org/sha256/041ajcg2pz918kd9iqcj4inpzddc3impvz3r2nhlpbv8zrz011hn" 404 "Not Found"
failed to download "/gnu/store/9p89jwaf4hnm0w5chfswcmfcf0v18719-artanis-0.2.1.tar.gz" from "ftp://alpha.gnu.org/gnu/artanis/artanis-0.2.1.tar.gz"
builder for `/gnu/store/y71m1hyqy83wr6nligda5n45gaqi03ql-artanis-0.2.1.tar.gz.drv' failed to produce output path `/gnu/store/9p89jwaf4hnm0w5chfswcmfcf0v18719-artanis-0.2.1.tar.gz'
cannot build derivation `/gnu/store/zvikipw5yx8m5kylhpwf09sf7lxwnzaj-artanis-0.2.1.drv': 1 dependencies couldn't be built
guix package: error: build failed: build of `/gnu/store/zvikipw5yx8m5kylhpwf09sf7lxwnzaj-artanis-0.2.1.drv' failed