bug#27090: Frequent errors from 'guix publish' on Hydra

[Mark H Weaver]

On Hydra, 'guix publish' is printing many errors to its stdout/stderr.
See below for an excerpt of its recent output.  I killed it and
restarted it.

      Mark


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GET /2x7d43qilhp39njy0s2qh7cqv1wqqcy3.narinfo
In ice-9/boot-9.scm:
 160: 5 [catch #t #<catch-closure 2b8ec00> ...]
In unknown file:
   ?: 4 [apply-smob/1 #<catch-closure 2b8ec00>]
In guix/workers.scm:
  84: 3 [#<procedure 2b523f0 at guix/workers.scm:82:2 ()>]
  72: 2 [loop]
  76: 1 [#<procedure 2ab6520 at guix/workers.scm:73:11 (key . args)> 
system-error ...]
In unknown file:
   ?: 0 [make-stack #t]
ERROR: In procedure make-stack:
ERROR: In procedure stat: No such file or directory: 
"/var/cache/guix/publish/none/2x7d43qilhp39njy0s2qh7cqv1wqqcy3-Python-3.5.2.tar.xz.nar"
GET /2sjlprdfm7i23qf9jxl47wnbbzxf4d7h.narinfo
In ice-9/boot-9.scm:
 160: 5 [catch #t #<catch-closure 2b8ec00> ...]
In unknown file:
   ?: 4 [apply-smob/1 #<catch-closure 2b8ec00>]
In guix/workers.scm:
  84: 3 [#<procedure 2b523f0 at guix/workers.scm:82:2 ()>]
  72: 2 [loop]
  76: 1 [#<procedure 2ab6520 at guix/workers.scm:73:11 (key . args)> 
system-error ...]
In unknown file:
   ?: 0 [make-stack #t]
ERROR: In procedure make-stack:
ERROR: In procedure stat: No such file or directory: 
"/var/cache/guix/publish/none/2sjlprdfm7i23qf9jxl47wnbbzxf4d7h-dbus-1.10.14.tar.xz.nar"
GET /2g7nf5h6hnsz1sharnqxfjz9m6k7224z.narinfo
In ice-9/boot-9.scm:
 160: 5 [catch #t #<catch-closure 2b8ec00> ...]
In unknown file:
   ?: 4 [apply-smob/1 #<catch-closure 2b8ec00>]
In guix/workers.scm:
  84: 3 [#<procedure 2b523f0 at guix/workers.scm:82:2 ()>]
  72: 2 [loop]
  76: 1 [#<procedure 2ab6520 at guix/workers.scm:73:11 (key . args)> 
system-error ...]
In unknown file:
   ?: 0 [make-stack #t]
ERROR: In procedure make-stack:
ERROR: In procedure stat: No such file or directory: 
"/var/cache/guix/publish/none/2g7nf5h6hnsz1sharnqxfjz9m6k7224z-make-4.2.1.tar.xz.nar"
GET /288vbaj26b5mijg1mlj6wail4v8fq2y1.narinfo
In ice-9/boot-9.scm:
 160: 5 [catch #t #<catch-closure 2b8ec00> ...]
In unknown file:
   ?: 4 [apply-smob/1 #<catch-closure 2b8ec00>]
In guix/workers.scm:
  84: 3 [#<procedure 2b523f0 at guix/workers.scm:82:2 ()>]
  72: 2 [loop]
  76: 1 [#<procedure 2ab6520 at guix/workers.scm:73:11 (key . args)> 
system-error ...]
In unknown file:
   ?: 0 [make-stack #t]
ERROR: In procedure make-stack:
ERROR: In procedure stat: No such file or directory: 
"/var/cache/guix/publish/none/288vbaj26b5mijg1mlj6wail4v8fq2y1-libcap-2.24.tar.xz.nar"
GET /0x1wwz0jikkqbd7q0lp9shsip5ywb5a4.narinfo
In ice-9/boot-9.scm:
 160: 5 [catch #t #<catch-closure 2b8ec00> ...]
In unknown file:
   ?: 4 [apply-smob/1 #<catch-closure 2b8ec00>]
In guix/workers.scm:
  84: 3 [#<procedure 2b523f0 at guix/workers.scm:82:2 ()>]
  72: 2 [loop]
  76: 1 [#<procedure 2ab6520 at guix/workers.scm:73:11 (key . args)> 
system-error ...]
In unknown file:
   ?: 0 [make-stack #t]
ERROR: In procedure make-stack:
ERROR: In procedure stat: No such file or directory: 
"/var/cache/guix/publish/none/0x1wwz0jikkqbd7q0lp9shsip5ywb5a4-perl-5.24.0.tar.xz.nar"
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