Hello,

advancing with my first steps in guix, I have lots of questions, probably 
naive ones.

$ guix-package -n -i hello

throws lots of error messages:

Backtrace:
In ice-9/boot-9.scm:
  63: 19 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 407: 18 [eval # #]
In unknown file:
   ?: 17 [call-with-input-string "(apply (module-ref (resolve-interface 
'(guix-package)) 'guix-package) (cdr (command-line)))" ...]
In ice-9/command-line.scm:
 174: 16 [#<procedure ccfac0 at ice-9/command-line.scm:169:3 (port)> 
#<input: string b78270>]
In unknown file:
   ?: 15 [eval (apply (module-ref # #) (cdr #)) #<directory (guile-user) 
db7d80>]
In ice-9/boot-9.scm:
 149: 14 [catch srfi-34 #<procedure 1146b20 at guix/ui.scm:61:2 ()> ...]
 157: 13 [#<procedure 12a4d20 ()>]
In /usr/local/bin/guix-package:
 438: 12 [#<procedure e37750 at /usr/local/bin/guix-package:430:4 ()>]
 323: 11 [process-actions (# # #)]
In srfi/srfi-1.scm:
 664: 10 [filter-map #<procedure 1141ae0 at /usr/local/bin/guix-
package:332:33 (expr)> ...]
In guix/packages.scm:
 295: 9 [package-derivation # # "x86_64-linux"]
In srfi/srfi-1.scm:
 578: 8 [map #<procedure expand-input (expr)> (("gawk" #))]
In guix/packages.scm:
 247: 7 [expand-input ("gawk" #)]
 295: 6 [package-derivation # # "x86_64-linux"]
In srfi/srfi-1.scm:
 578: 5 [map #<procedure expand-input (expr)> (# #)]
In guix/packages.scm:
 247: 4 [expand-input ("libsigsegv" #)]
 301: 3 [package-derivation # # "x86_64-linux"]
In guix/derivations.scm:
 606: 2 [build-expression->derivation # "libsigsegv-2.10.tar.gz" "x86_64-
linux" ...]
In guix/store.scm:
 408: 1 [add-text-to-store # "libsigsegv-2.10.tar.gz-guile-builder" ...]
In unknown file:
   ?: 0 [put-bytevector #<input-output: socket 5> #vu8(8 0 0 0 0 0 0 0) 
...]

ERROR: In procedure put-bytevector:
ERROR: In procedure fport_write: Bad file descriptor
the following derivations would be built:
    /nix/store/ry0il2rwcxl053y01ffddghl9s7mvkck-hello-2.8.drv
etc.


After that, things seem to proceed well for the moment;
$ guix-package -i hello
starts by downloading things and compiling them.
Concerning the downloads, would it be possible to easily add a progress
bar? In particular since the first download was gcc, quite some time passed
without any hint as to whether the program was still working.

Andreas