bug#63634: nar 404 leads to hard ‘guix substitute’ crash

[Ludovic Courtès]

Simon Tournier <zimon.toutoune@gmail.com> skribis:

>   2. &message: 
> "https://bordeaux.guix.gnu.org/nar/zstd/sx6sr6cs1x8sf5jhgb65rcr1yxk1q75x-rust-base64-0.13.1.tar.xz:
>  HTTP download failed: 404 (\"Not Found\")"

Look:

--8<---------------cut here---------------start------------->8---
$ wget -qO- 
https://bordeaux.guix.gnu.org/sx6sr6cs1x8sf5jhgb65rcr1yxk1q75x.narinfo
StorePath: /gnu/store/sx6sr6cs1x8sf5jhgb65rcr1yxk1q75x-rust-base64-0.13.1.tar.xz
NarHash: sha256:0pynnlsiiq03h7ysfkzw53wkf6hfmplb63haz6bjqdc686rnf4q1
NarSize: 49128
References: 
System: x86_64-linux
Deriver: qcpzwblzpa2wprc4vwlm128bwckfj8rj-rust-base64-0.13.1.tar.xz.drv
Signature: 
1;bayfront;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
URL: nar/lzip/sx6sr6cs1x8sf5jhgb65rcr1yxk1q75x-rust-base64-0.13.1.tar.xz
Compression: lzip
FileSize: 49781
--8<---------------cut here---------------end--------------->8---

See? zstd’s gone!  This confirms my hypothesis.

BTW, ‘guix publish’ has provisions to not compress already-compressed
files, as in the case above.  We should really share code, Chris.

Ludo’.