I created a procedure to work around the build failure and enable a successful build:
# when gnutls-3.6.12 build breaks you need to do: # run the following as root # turn off networking ip link set enp0s25 down # Fixup the time so that the build will succeed timedatectl set-ntp false timedatectl set-time '2020-10-01' # Try to build but it will absolutely fail by lack of source if you # don't enable networking or because you enable networking. # But turn on networking when specified below guix time-machine --commit=94585fffb23079fe71110e2bf99782eb4ccfa12b -- # build --no-grafts --check guile3.0-gnutls # after it finishes building # /gnu/store/vhphki5sg9xkdhh2pbc8gi6vhpfzryf0-gnutls-3.6.12.drv # and starts building # /gnu/store/akm0wl58avib46g3d9razlfzfgfg8m6m-python-3.8.2.drv... # but before it begins building # /gnu/store/bja7gqzxr62a0akid0rpzmynzy78nkwg-zstd-1.4.4.tar.gz.drv. # Fix the time and turn on networking as it has additional things to # download. # specifically # https://github.com/facebook/zstd/releases/download/v1.4.4/zstd-1.4.4.tar.gz # and substitutes for some reason # failing to do so will result in you needing to repeat the above steps # again. timedatectl set-time '$current_date' timedatectl set-ntp true # turn on networking ip link set enp0s25 up # it'll fail building because the time is current again # But that is fine, we now will not need networking for this build cycle # and thus the altered time will be fine and the build will be # successful this time # turn off networking ip link set enp0s25 down # Fixup the time so that the build will succeed timedatectl set-ntp false timedatectl set-time '2020-10-01' #guix build gnutls@3.6.12 finally guix time-machine --commit=94585fffb23079fe71110e2bf99782eb4ccfa12b -- # build --no-grafts --check guile3.0-gnutls # wait until it completes. # Then we can put the system back in a working state timedatectl set-time '$current_date' timedatectl set-ntp true # turn on networking ip link set enp0s25 up