Fixes a regression introduced in
795d430d90 whereby 'guix describe' would
no longer display the generation number of ~/.config/guix/current.
* guix/scripts/describe.scm (guix-describe): Call 'canonicalize-profile'.
Previously a command like:
$(readlink -f ~/.config/guix/current)/bin/guix describe
would succeed without printing anything.
* guix/scripts/describe.scm (display-profile-info): Don't call
'generation-file-name' when NUMBER is zero.
* guix/scripts/pull.scm (display-profile-content): Likewise.