As reported on #guix by user ilit, when the terminal is very narrow, the download progress line is constantly reprinted, as in this excerpt:
$ guix build -S libreoffice substitute: warning: failed to install locale: Invalid argument The following file will be downloaded: /gnu/store/yv821gn5z48g19mzjcvb4dfcxljjsg8q-libreoffice-5.0.5.2.tar.xz @ substituter-started /gnu/store/yv821gn5z48g19mzjcvb4dfcxljjsg8q-libreoffice-5.0.5.2.tar.xz /gnu/store/9p7mf2a21c6a5k06jgbb9yg9abx7ilh9-guix-0.10.0-0.8062/libexec/guix/substitute warning: failed to install locale: Invalid argument Found valid signature for /gnu/store/yv821gn5z48g19mzjcvb4dfcxljjsg8q-libreoffice-5.0.5.2.tar.xz >From >https://4606.nsupdate.info/nar/yv821gn5z48g19mzjcvb4dfcxljjsg8q-libreoffice-5.0.5.2.tar.xz Downloading yv821g...-libreoffice-5.0.5.2.tar.xz (159.4MiB installed)... libreoffice-5.0.5.2.tar.xz 2.7MiB/s 00:00 | 104KiB transferre libreoffice-5.0.5.2.tar.xz 2.7MiB/s 00:00 | 112KiB transferre libreoffice-5.0.5.2.tar.xz 2.9MiB/s 00:00 | 120KiB transferre libreoffice-5.0.5.2.tar.xz 2.7MiB/s 00:00 | 128KiB transferre libreoffice-5.0.5.2.tar.xz 2.8MiB/s 00:00 | 136KiB transferre libreoffice-5.0.5.2.tar.xz 2.8MiB/s 00:00 | 144KiB transferre libreoffice-5.0.5.2.tar.xz 2.9MiB/s 00:00 | 152KiB transferre libreoffice-5.0.5.2.tar.xz 3.0MiB/s 00:00 | 160KiB transferre lib
