I've noticed confusing behavior regarding the memoized cache, which depends on the state of the network connection.
I have a built package in my store and I am connected to the internet: $ ./pre-inst-env guix build gss substitute: updating list of substitutes from 'https://example.com'... 100.0% /gnu/store/ywh8cz5j63s8iwr2w2lzj3vyhqwqlhcz-gss-1.0.3 Then, I disable my network interface and run the command again: $ ./pre-inst-env guix build gss @ substituter-started /gnu/store/y9akh452n3p4w2v631nj0injx7y0d68x-mpc-1.0.3.tar.gz /gnu/store/6z7d9fpaph1yl1csfnnkrdv6jzr4simn-guix-0.13.0-2.de9d8f0/libexec/guix/substitute Downloading https://mirror.hydra.gnu.org/guix/nar/y9akh452n3p4w2v631nj0injx7y0d68x-mpc-1.0.3.tar.gz... guix substitute: error: host name lookup error: Temporary failure in name resolution @ substituter-failed /gnu/store/y9akh452n3p4w2v631nj0injx7y0d68x-mpc-1.0.3.tar.gz 256 fetching path `/gnu/store/y9akh452n3p4w2v631nj0injx7y0d68x-mpc-1.0.3.tar.gz' failed with exit code 1 @ build-started /gnu/store/y4r20fnm9ba129r2ry6s2k1ss975dknd-gcc-5.4.0.tar.xz.drv - x86_64-linux /var/log/guix/drvs/y4//r20fnm9ba129r2ry6s2k1ss975dknd-gcc-5.4.0.tar.xz.drv.bz2 guix build: error: build failed: some substitutes for the outputs of derivation `/gnu/store/ikdvc8qn0bi57hn3ci72l5xlqyss96ys-mpc-1.0.3.tar.gz.drv' failed (usually happens due to networking issues); try `--fallback' to build derivation from source $ ./pre-inst-env guix build gss --fallback /gnu/store/ywh8cz5j63s8iwr2w2lzj3vyhqwqlhcz-gss-1.0.3 So, when I am offline, I have to use --fallback for the local cache to work.
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