$ nix build nixpkgs.aviora.default.b2b --builders b2bbuilder --option builders-use-substitutes true --max-jobs 0 -I nixpkgs=.
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/0w6l8kh3d30kg3nxc8xyi84gmrfxjnns-git-2.21.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/0w6l8kh3d30kg3nxc8xyi84gmrfxjnns-git-2.21.0'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/ljf4xvvrh0l60rhm998awrpj65fbjhld-hscolour-1.24.4'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/ljf4xvvrh0l60rhm998awrpj65fbjhld-hscolour-1.24.4'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/ijkhahhw0kpcr1d765b03902qxxx88jb-nodejs-10.15.3'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/ijkhahhw0kpcr1d765b03902qxxx88jb-nodejs-10.15.3'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/3xzkc4wyadr3vrva2q320axjr6cyb43n-python-2.7.16'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/3xzkc4wyadr3vrva2q320axjr6cyb43n-python-2.7.16'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/qcm4v3apzjslw1zff5l7k1r510925x78-util-linux-2.33.2-dev'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/qcm4v3apzjslw1zff5l7k1r510925x78-util-linux-2.33.2-dev'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/0w6l8kh3d30kg3nxc8xyi84gmrfxjnns-git-2.21.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/0w6l8kh3d30kg3nxc8xyi84gmrfxjnns-git-2.21.0'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/nsdkla821dx02nf555jv32s4ghh1xbwl-postgresql-9.6.12-lib'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/nsdkla821dx02nf555jv32s4ghh1xbwl-postgresql-9.6.12-lib'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/bxci2dsl8rkznnlpmwcmhfpdz8jvfd6z-rdkafka-1.0.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/bxci2dsl8rkznnlpmwcmhfpdz8jvfd6z-rdkafka-1.0.0'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yi32vkj2hpnr357hfvxfw4nzkllwhzlb-postgresql-9.6.12'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yi32vkj2hpnr357hfvxfw4nzkllwhzlb-postgresql-9.6.12'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/nsdkla821dx02nf555jv32s4ghh1xbwl-postgresql-9.6.12-lib'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/nsdkla821dx02nf555jv32s4ghh1xbwl-postgresql-9.6.12-lib'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/ggkh5w25sydzb175wd6r178mcnd78qgn-asciidoc-8.6.9'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/v6dfdn49nga63886x08b0hrkczsvbi99-docbook-xml-4.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/kzk5hj4b65pla8cgp300lqk0ddcvglpn-docbook2X-0.8.8'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/s9fsc6ybfw0ild6krcy9vyy63aw98sgw-http-parser-2.9.2'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/s9fsc6ybfw0ild6krcy9vyy63aw98sgw-http-parser-2.9.2'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/0jl2dhydfh3jbfpkgkrixisqkhj12d4y-libffi-3.2.1-dev'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/0jl2dhydfh3jbfpkgkrixisqkhj12d4y-libffi-3.2.1-dev'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/4f2f0582p63q945gdn6ahnjarhi8m1w6-libuv-1.28.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/4f2f0582p63q945gdn6ahnjarhi8m1w6-libuv-1.28.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m088h983gjr2d65cbzb9blmih1gijb96-libxslt-1.1.33-dev'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/2ar3zk5fjr34ys2dqnsfbb678x6fdlj4-openssh-7.9p1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/2ar3zk5fjr34ys2dqnsfbb678x6fdlj4-openssh-7.9p1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/91a8wnca647kfw67sk0iykdbyjpr8430-perl5.28.2-libwww-perl-6.38'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/91a8wnca647kfw67sk0iykdbyjpr8430-perl5.28.2-libwww-perl-6.38'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/s5f3vpmig33nk4zyk228q55wdydd3pc2-python3-3.7.3'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/ar3pj0k92lqiza2xf9ah13g439p1mbw7-python3.7-sphinx-1.8.3'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/bxps2h6axpqrjxcmib344a3immy3gvhd-readline-6.3p08'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/bxps2h6axpqrjxcmib344a3immy3gvhd-readline-6.3p08'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/jxpf5gdrrmbc65im3jiph0lpzcn1sf5s-readline-6.3p08-dev'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/2xhsrw4ws6kc4x3983wdwwlnim27c6iz-shadow-4.6'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/2xhsrw4ws6kc4x3983wdwwlnim27c6iz-shadow-4.6'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/ap4sr1n0wlgmybxbw3pvq8klh8snc3n8-sqlite-3.28.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/ap4sr1n0wlgmybxbw3pvq8klh8snc3n8-sqlite-3.28.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/51r64l83f4xmwhi0qpxq8wggxhjki8w5-sqlite-3.28.0-dev'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/jpamsarvbnjcdk4zzybrwkirm3lpdyzw-systemd-239.20190219-dev'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/f2bw5v6xsqjv21nq505wq72f6qzbz465-xmlto-0.0.28'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/saxh4n72zyv02pbjhsvsw8bkrwqnrnga-dejagnu-1.6.2'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/ba6ky58wzxj52l8qni2b9ak9nkz3q55y-docbook-xml-4.2'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/ir6i6kjrdr1s64rck0gj2ii8pm8ggfpq-docbook-xml-4.3'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/mkbq9i2m8qva6s8wnw1c9yjg4zsb86p5-glib-2.60.1-dev'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/2c0ik06ff1a8v3gkls3h83kk7073c4gq-gnome-doc-utils-0.20.10'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/qkvfad6spdk7qkiv0fiwsqhiz4206wzb-gnu-efi-3.0.9'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/xgmj517j6fzacfm3s77bg34qqcq801ly-hook'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/qjz9ih2gmkwwfqb31vrdv37hiwky821x-intltool-0.51.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/lr9yhdbn8a3la69j56cz0vi1qva973dv-kbd-2.0.4'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/rl2z4bb7wkfp0g12ccqffh287qal1109-kmod-26'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/6b2jabk1scwhhk9bz7wjzycvmkiw419d-libapparmor-2.13.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/pr5qs0xgdyqsgjjlv9d7yslgg96vhw44-libcap-2.27-dev'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/nm6mmpzjpvsadakx22ix3x25y5sqqm4x-libmicrohttpd-0.9.63-dev'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/p5xc2jr09j2y11dhj1vmw1b6xcdmcxvq-libxml2-2.9.9-bin'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/p5xc2jr09j2y11dhj1vmw1b6xcdmcxvq-libxml2-2.9.9-bin'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/bq3qjmxvhvd2hmzqqh7b27llndwqcqf7-libxml2-2.9.9-dev'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/bq3qjmxvhvd2hmzqqh7b27llndwqcqf7-libxml2-2.9.9-dev'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/hkc0gzhqj9kizanp077sfaixyy4rcpgg-libxml2-2.9.9-py'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/hkc0gzhqj9kizanp077sfaixyy4rcpgg-libxml2-2.9.9-py'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/45ijnncz1978n1q8r9dwg6ifd19lbldq-lz4-1.9.1-dev'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/v8hc5brl2mymmh0sqd23krnmc9z5zny0-meson-0.49.2'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/ya782bsv35crvqg8svn3a98akgs7djb9-ninja-1.9.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/8m6cvpw7rs92v6jm45gxvzzwgcyz54i7-opensp-1.5.2'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/q7pl5a7rs8rxkl4kf3z29r8vbzm9h1bb-perl5.28.2-XML-Parser-2.44'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/ggz0hcx7vflq0y1m0b504c08lb987lnq-python3.7-Babel-2.6.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/n1dcmv0ii513dhlnllc790vfn8i9j9lj-python3.7-Jinja2-2.10.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/qq3pb9lz7az7mvfh4alm790zn0559rcd-python3.7-Pygments-2.3.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/5wr1fcd6b4dl29qa6dmj5krrzb3n1hgd-python3.7-SQLAlchemy-1.2.14'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/p0ddq8dbqkk0v9xz449gwrjp38sn0zwy-python3.7-Whoosh-2.7.4'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/vawaiqccln4a1ig52jv2z0m5hw0izgs9-python3.7-alabaster-0.7.12'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/9lyx7x9ism8f3xiji1swiwgp68hkpb04-python3.7-bootstrapped-pip-19.0.3'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/xs7jycykni824faay6i1xcsrqn3sjy7a-python3.7-docutils-0.14'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/v1yg31pa0blvg514b25b29v6px8ikm7y-python3.7-html5lib-1.0.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/xn6vl34rv0vd2d8y2n5z02kmsvq4ww2y-python3.7-imagesize-1.1.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/678blkygkggfhfgbs40wjqd9s9dlpla2-python3.7-mock-2.0.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/d0wcd9mid6067i6va19lwiv29hln6n2j-python3.7-requests-2.21.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yf4i32dx953p2dv2agfdyxdwg6ba0l61-python3.7-setuptools-41.0.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/madnnpybgj4ca004mp3nzjyzhgl23w0k-python3.7-simplejson-3.16.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/dy5wi2sqnhbnlpvjr8a0z96id1mq243j-python3.7-six-1.12.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/3b7w4s7zb3k2754rl5y1yk157mqb6j6r-python3.7-snowballstemmer-1.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/rb2k3g4rr7qhh8xgdhaff02flvwimdkd-python3.7-sphinxcontrib-websupport-1.1.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/80y2xgnl3swf9n1bpra2mwsms17fvm3f-source'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/dzvwpvw4ldmnpmmqalkcrllxiwslbm8n-source'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/n239gck8dkimxq4s7d66c04qyiw8ynad-source'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/vw6frwzx7g1dn775wr05jlny99cy3dr2-source'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/01aggsi1ndjhnr93gcy8c4s1xbxab8dn-unzip-6.0'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/s7rqxrfb631i53dfl90gac35095jyypq-util-linux-2.33.2-bin'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/qm58nz46p6gx8v4smaki4x93jdrj6b4z-util-linux-2.33.2-dev'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/5rn96azisww10qz8qw0v993z565a3x0h-w3m-0.5.3+git20190105'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/57l4v29qi3z0ykac63nzyb32mgynqxvr-python3.7-lxml-4.3.3'
cannot build on 'ssh://b2bbuilder': cannot connect to 'b2bbuilder': ssh: Could not resolve hostname b2bbuilder: Name or service not known
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/p5xc2jr09j2y11dhj1vmw1b6xcdmcxvq-libxml2-2.9.9-bin'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/p5xc2jr09j2y11dhj1vmw1b6xcdmcxvq-libxml2-2.9.9-bin'
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warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/9xb22l3577nznvd6dqqis6ixgmwq9ygh-python3.7-pycparser-2.19'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/5ydkc9jcaaxlz58dr7gvyhi3gcmafsfy-python3.7-pyparsing-2.3.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/32c3vzrjsx9b6sk8aj9r3sm29kfdwi4r-python3.7-pytest-forked-1.0.2'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/20wmykp8fj2izxdj8lic8ggcfpdid5ka-tzdata-2019a'
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warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
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warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/m80snlingdn5qgnklzaixscsvw2gsamq-ghc-8.6.5'
warning: substituter 'ssh://b2builder' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
warning: substituter 'https://cache.nixos.org' does not have a valid signature for path '/nix/store/yh1w64xprl0rxmj8nvxpmikp6x3qvgdb-libffi-3.2.1'
error: unable to start any build; either increase '--max-jobs' or enable remote builds