bug#25200: guix lint throws gnutls error

[Maxim Cournoyer]

Hello Guix!

I'm using an up-to-date Guix (running directly from the Git tree) and
recently started getting the following gnutls errors when attempting to
run "guix lint some-package". This happens for any package.

The complete error traceback returned on the console looks like:

 guix lint icecat
gnu/packages/gnuzilla.scm:304:2: icecat-45.5.1-gnu1: file names of patches 
should start with the package name
Backtrace:cecat-45.5.1-gnu1 [cve]...
In ice-9/boot-9.scm:
 160: 17 [catch #t #<catch-closure 2855e20> ...]
In unknown file:
   ?: 16 [apply-smob/1 #<catch-closure 2855e20>]
In ice-9/boot-9.scm:
  66: 15 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 14 [eval # #]
In ice-9/boot-9.scm:
2404: 13 [save-module-excursion #<procedure 2875900 at ice-9/boot-9.scm:4051:3 
()>]
4056: 12 [#<procedure 2875900 at ice-9/boot-9.scm:4051:3 ()>]
1727: 11 [%start-stack load-stack ...]
1732: 10 [#<procedure 2889b70 ()>]
In unknown file:
   ?: 9 [primitive-load 
"/gnu/store/qxawdi2q9bhr9x4v57wbnj8y5krhhm3p-guix-0.11.0-8.8d12/bin/.guix-real"]
In guix/ui.scm:
1222: 8 [run-guix-command lint "icecat"]
In srfi/srfi-1.scm:
 616: 7 [for-each #<procedure 35c4680 at guix/scripts/lint.scm:1056:20 (spec)> 
#]
In guix/scripts/lint.scm:
 964: 6 [run-checkers # #]
In srfi/srfi-1.scm:
 616: 5 [for-each #<procedure 3dcf2a0 at guix/scripts/lint.scm:964:14 
(checker)> #]
In guix/scripts/lint.scm:
 786: 4 [check-vulnerabilities #]
 781: 3 [#<procedure 35c2b00 at guix/scripts/lint.scm:771:4 (package)> #]
In unknown file:
   ?: 2 [force #<promise #<procedure 35c2be0 at guix/scripts/lint.scm:769:16 
()>>]
In guix/scripts/lint.scm:
 770: 1 [#<procedure 35c2be0 at guix/scripts/lint.scm:769:16 ()>]
In ice-9/boot-9.scm:
 160: 0 [catch srfi-34 #<procedure 35c2ce0 at guix/scripts/lint.scm:743:2 ()> 
...]

ice-9/boot-9.scm:160:17: In procedure catch:
ice-9/boot-9.scm:160:17: Throw to key `gnutls-error' with args 
`(#<gnutls-error-enum Error while reading file.> 
set-certificate-credentials-x509-trust-file!)'.

I'm using GuixSD and ran "sudo guix system reconfigure /etc/config.scm"
prior to sending this report, so everything should be current. This
config contains the nss-certs package, which should include gnutls, I
believe. Here's my config, in case:

;; This is an operating system configuration template
;; for a "desktop" setup without full-blown desktop
;; environments.

(use-modules (gnu) (gnu system nss))
(use-service-modules desktop)
(use-package-modules wm ratpoison certs)

(operating-system
  (host-name "apteryx")
  (timezone "America/Los_Angeles")
  (locale "en_US.UTF-8")

  ;; Assuming /dev/sdX is the target hard disk, and "my-root"
  ;; is the label of the target root file system.
  (bootloader (grub-configuration (device "/dev/sda")))

  (file-systems (cons (file-system
                        (device "my-root")
                        (title 'label)
                        (mount-point "/")
                        (type "ext4"))
                      %base-file-systems))

  (users (cons (user-account
                (name "maxim")
                (comment "Maxim Cournoyer")
                (group "users")
                (supplementary-groups '("wheel" "netdev"
                                        "audio" "video"))
                (home-directory "/home/maxim"))
               %base-user-accounts))

  ;; Add a bunch of window managers; we can choose one at
  ;; the log-in screen with F1.
  (packages (cons* ratpoison ; i3-wm xmonad  ;window managers
                   nss-certs               ;for HTTPS access
                   %base-packages))

  ;; Use the "desktop" services, which include the X11
  ;; log-in service, networking with Wicd, and more.
  (services %desktop-services)

  ;; Allow resolution of '.local' host names with mDNS.
  (name-service-switch %mdns-host-lookup-nss))