bug#34786: “guix offload test” doesn’t report missing key pairs on the remote host

[Ludovic Courtès]

Hello,

When trying to offload to a remote machine R that doesn’t have a key
pair in /etc/guix, ‘guix offload test’ currently fails like this:

--8<---------------cut here---------------start------------->8---
guix offload: testing 3 build machines defined in '/etc/guix/machines.scm'...
guix offload: Guix is usable on 'R' (test returned 
"/gnu/store/883yjkl46dxw9mzykykmbs0yzwyxm17z-test")
guix offload: 'R' is running GNU Guile 2.2.4
sending 1 store item (0 MiB) to 'R'...
exporting path `/gnu/store/dbs25m05x1v43s66frh1060ibxdy3q70-export-test'
guix offload: 'R' successfully imported 
'/gnu/store/dbs25m05x1v43s66frh1060ibxdy3q70-export-test'
retrieving 1 store item from 'R'...
guix offload: error: implementation cannot deal with > 32-bit integers
--8<---------------cut here---------------end--------------->8---

When stracing “guix offload test”, we see this:

--8<---------------cut here---------------start------------->8---
write(1, "retrieving 1 store item from 'RRRRR.guix.info'...\n", 50) = 50
write(16, "\33\0\0\0\0\0\0\0", 8)       = 8
read(16, "atad\0\0\0\0", 8)             = 8
read(16, "\0\200\0\0\0\0\0\0", 8)       = 8

[...]

write(16, 
"M\1\0\0\0\0\0\0\1\0\0\0\0\0\0\0\r\0\0\0\0\0\0\0nix-archive-1\0\0\0\1\0\0\0\0\0\0\0(\0\0\0\0\0\0\0\4\0\0\0\0\0\0\0type\0\0\0\0\7\0\0\0\0\0\0\0regular\0\10\0\0\0\0\0\0\0contents\26\0\0\0\0\0\0\0RRRRR.guix.info-966879\0\0\1\0\0\0\0\0\0\0)\0\0\0\0\0\0\0NIXE\0\0\0\0007\0\0\0\0\0\0\0/gnu/store/3bxyihakqhhcwckb2yz3h7fzmfii0wsn-import-test\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\0\0\0\0\0\0\0(protocol-error
 1 \"getting status of `/etc/guix/signing-key.sec': No such file or 
directory\")\0\0\0", 344) = 344
read(16, "ptxc\0\0\0\0", 8)             = 8
read(16, "1\0\0\0\0\0\0\0", 8)          = 8
read(16, "implementation cannot deal with > 32-bit integers", 49) = 49
read(16, "\0\0\0\0\0\0\0", 7)           = 7
read(16, "\1", 1)                       = 1
read(16, "\0\0\0\0\0\0\0", 7)           = 7
--8<---------------cut here---------------end--------------->8---

Ludo’.