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* nix/libstore/build.cc (prepareSlirpChrootAction): Use canonPath(i, true) to resolve symlinks when adding /etc/resolv.conf and /etc/hosts to the slirp4netns chroot, so that bindMount receives a regular file path instead of a symlink. On systems using systemd-resolved, /etc/resolv.conf is typically a symlink: /etc/resolv.conf -> /run/systemd/resolve/stub-resolv.conf The slirp4netns chroot creates an empty /run/ directory, so when bindMount copies the symlink verbatim (spawn.cc line 537-542), the target does not exist and slirp4netns cannot determine the upstream DNS server. This causes all DNS resolution to fail for fixed-output derivations that use the Guile-based git-fetch builder (e.g. git-fetch/lfs), since they rely on slirp4netns for network access in the build chroot. Derivations using builtin:git-download are unaffected because they run in the daemon process itself, which has full network access. Change-Id: Ib73e69a8760e74eb8141dd0408c27aa8b3001e37 Signed-off-by: Ludovic Courtès <ludo@gnu.org> Merges: #6959