bug#51983: guix build: error: integer expected from stream

[Tobias Geerinckx-Rice via Bug reports for GNU Guix <bug-guix@gnu.org>]

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Guix,

I saw this reported by jlicht on #guix but I'm pretty sure that 
it's been reported a few times.

Here's the error, with channel:

(channel
  (name 'guix) (url "https://git.savannah.gnu.org/git/guix.git")
  (branch "core-updates-frozen")
  (introduction
    (make-channel-introduction
     "9edb3f66fd807b096b48283debdcddccfea34bad"
     (openpgp-fingerprint
      "BBB0 2DDF 2CEA F6A8 0D1D  E643 A2A0 6DF2 A33A 54FA"))))

And patch:

--8<---------------cut here---------------start------------->8---
From: Tobias Geerinckx-Rice <me@tobias.gr>
Date: Fri, 19 Nov 2021 17:37:44 +0100
Subject: [PATCH] daemon: Print the line whence we expect an 
integer.

* nix/libstore/local-store.cc 
  (LocalStore::getLineFromSubstituter):
Include the malformed substituter stream line in the error 
message.

---
 nix/libstore/local-store.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/nix/libstore/local-store.cc 
b/nix/libstore/local-store.cc
index 675d1ba66f..83b6681122 100644
--- a/nix/libstore/local-store.cc
+++ b/nix/libstore/local-store.cc
@@ -839,7 +839,8 @@ template<class T> T 
LocalStore::getIntLineFromSubstituter(Agent & run)
 {
     string s = getLineFromSubstituter(run);
     T res;
-    if (!string2Int(s, res)) throw Error("integer expected from 
     stream");
+    if (!string2Int(s, res))
+        throw Error(format("integer expected from stream: %1%") % 
s);
     return res;
 }
 
-- 
2.34.0
--8<---------------cut here---------------end--------------->8---

(…which I'd like to merge if there are no objections…)

--8<---------------cut here---------------start------------->8---
λ guix time-machine -C ~/channels.scm -- build texlive 
--substitute-urls="https://guix.tobias.gr 
https://bordeaux.guix.gnu.org https://ci.guix.gnu.org"
[…]
substitute: updating substitutes from 
'https://guix.tobias.gr'... 100.0%
substitute: updating substitutes from 
'https://bordeaux.guix.gnu.org'... 100.0%
substitute: updating substitutes from 
'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 
'https://substitutes.nonguix.org'... 100.0%
substitute: updating substitutes from 
'https://mirror.brielmaier.net'... 100.0%
The following derivations will be built:
   /gnu/store/i32vy0dhw00y59ajpfbzb66z7g5x5bmh-texlive-texmf-20210325.drv
   /gnu/store/z5r60zy9vmydf44fdyyc7hgc6q93aahm-texlive-20210325-texmf.tar.xz.drv
100.5 MB will be downloaded:
   /gnu/store/0brdikxqk59hdr47qabcm3sya001d8vf-glibc-utf8-locales-2.33
   /gnu/store/910a1558wknjm4687681kr0w2invish4-tcsh-6.22.03
   /gnu/store/jazwfsj2v41yih2yzw5nydqgdz1hgfm4-file-5.39
   /gnu/store/2ank6pw2lrybx24zyifkrc3bkxj8jpf4-lua-5.3.5
   /gnu/store/0777brz2w8k5s4g53yfh34fyxp5r08sq-module-import-compiled
   /gnu/store/l8kxrs01lll3pzjrd590p45l8k045q6q-make-4.3
   /gnu/store/l8l2y2dlya5rs9hfypmcb4saay7iwn0q-findutils-4.8.0
   /gnu/store/6mag7gwl47gh7h2lp5byvxxw80x2zi72-ed-1.17
   /gnu/store/m96snvbl92ivkd32giqh5f3d21bc2n5x-patch-2.7.6
   /gnu/store/s49sxmz9g4xmzz222cay9k04ziy3qgmj-diffutils-3.8
   /gnu/store/0v470agxfi4px58491h9932vwliljacr-teckit-2.5.10
   /gnu/store/nafmw4krl0q6c1agaz55vz6ls35inw29-zziplib-0.13.72
   /gnu/store/dswp2mfwb56xg57903cvhwcjj1fpdhqi-harfbuzz-2.8.2
   /gnu/store/fl8vfhmwkg7k1d8qr9apwq5yb0iqa9k5-libpaper-1.1.24
   /gnu/store/vbgd375j8p1iprljsizfwkfq56hi6mwi-jbig2dec-0.19
   /gnu/store/1d1xbgmdqdsz5pzcmpky3mbgzhxgx7jl-libtiff-4.3.0
   /gnu/store/1gn0gbzgqgj8x2vczfr2kgjkw1mlnz14-font-ghostscript-8.11
   /gnu/store/hgi1jja24hsj9yjmr6zrpazhgy42v94f-ghostscript-9.54.0
   /gnu/store/ic0ria97lvn16kg6jipzqq763rksvmhq-coreutils-minimal-8.32
   /gnu/store/k18as85v9s0z66w40wg9sym4c5qz03l2-perl-5.34.0
   /gnu/store/vhxayydx3y9n2gi2sc0dam26p7k1aaj8-libjpeg-turbo-2.0.5
   /gnu/store/8wzdcc46j1brwgw2kvk5878f887msz6m-gd-2.3.2
   /gnu/store/4inr1zm5334vz2p2shznc4iw1478bqan-libxaw-1.0.14
   /gnu/store/x64cjzj368falclljlmy72lh5qdk5fdp-mpfr-4.1.0
   /gnu/store/izcn0nn61pqf5p0j8073vrq8wyzrmkr4-graphite2-1.3.13
   /gnu/store/3nxgh1pmqg44f0ccg16ny4fs81mmafvq-pixman-0.40.0
   /gnu/store/53qn4zlhvsmn11lx5s15dqxsnjy59xfc-libxrender-0.9.10
   /gnu/store/5ybvb5jxlbfa93znylyy1f68h11l9qla-libelf-0.8.13
   /gnu/store/yqsj0ncmzxp4llcj74sj23wl11x3vigw-glib-2.70.0-bin
   /gnu/store/qqs98rxwjrji6aaf6dqwp7q4m545g2sn-glib-2.70.0
   /gnu/store/2431gxx661891b15zcn5sf14616bh287-cairo-1.16.0
   /gnu/store/7cddr79rydhc1m4hxr921mq17pz1jj3z-sed-4.8
   /gnu/store/35n3whmk8il5k9mv4i94g3hhq0x5v0iv-config-0.0.0-1.c8ddc84
   /gnu/store/72kpdqplq4nc87fm7ch47kxy3nlkzsyx-xz-5.2.5
   /gnu/store/p5fgysbcnnp8b1d91mrvjvababmczga0-python-3.9.6
   /gnu/store/m24fb3ig1wn7yfixp2cvsvik41fv325m-libxmu-1.1.3
   /gnu/store/7sik9fp2ffvnr7l01s423x4r5pn75rf9-icu4c-69.1
   /gnu/store/45xjw0k3mzpjkxhfhfganl0p8xnqgjq4-libxext-1.3.4
   /gnu/store/i67d4yi1zclniycczhi63z4cp42jmqra-libxt-1.2.1
   /gnu/store/04ccqq2y4khq38jvianwy9mw6zlr1vf4-libsm-1.2.3
   /gnu/store/xb8ksrk21cslvh9pvm53q5qsrhz6613p-libice-1.0.10
   /gnu/store/368cv23ggbgl91bw90hyhkqx5dzq0988-libxpm-3.5.13
   /gnu/store/ch15pm3i78dvh66l8ds80ijf6kj850j8-libsigsegv-2.13
   /gnu/store/v45pjc1yqmy59j9ff913p3ywn9qk4lqx-gawk-5.1.0
   /gnu/store/25gv43v5rm05i26z39ajrd6nsxa5r461-coreutils-8.32
   /gnu/store/f5jcpy9s4cxzphi0khrqvxhrqnnn9azm-ruby-2.7.4
   /gnu/store/375858dr3cqbwry58xcgc0776205p0mf-freetype-2.10.4
   /gnu/store/brpl5kly3c64ah2y9v3fgbwl32641c0f-libpng-1.6.37
   /gnu/store/q6riv4m9d392dhxdw8jhrn5gsvbcamj9-font-dejavu-2.37
   /gnu/store/2fk1gz2s7ppdicynscra9b19byrrr866-glibc-2.33
   /gnu/store/3ywv7s8d38rgcq7ljmc1s084358a2m3h-glibc-2.33-static
   /gnu/store/w6zv2mz56wyxr471q38a3cmzm4iqimy8-bzip2-1.0.8
   /gnu/store/379xr5pkxprcamhlcbqz9nghj90qxw86-fontconfig-minimal-2.13.94
   /gnu/store/irzhgvy2zb6dd9g7a6b343pn4lvsn9n0-texlive-bin-20210325
   /gnu/store/35xph93135j3l3l856b2504j1hll53vr-texlive-20210325
substitute: updating substitutes from 
'https://guix.tobias.gr'... 100.0%
substitute: updating substitutes from 
'https://bordeaux.guix.gnu.org'... 100.0%
substitute: updating substitutes from 
'https://ci.guix.gnu.org'... 100.0%
guix build: error: integer expected from stream: 
18446744071924943736
--8<---------------cut here---------------end--------------->8---

So this sounds like integer xerflow, which agains rings a bell… 
but I don't remember well enough which one.

Kind regards,

T G-R

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