fix: make Nix survive home volume mount in devops image#17
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Move nix.conf to /etc/nix/ (system-wide, outside the home volume) and symlink nix binaries from /usr/local/bin to their resolved /nix/store paths. This avoids relying on ~/.nix-profile or ~/.config which are wiped when Coder mounts a persistent volume over /home/coder.
Multiple nix-* binaries (nix-build, nix-env, etc.) resolve to the same /nix/store/.../bin/nix target. Using 'ln -s target /usr/local/bin/' takes the basename from the target, causing all links to collide on /usr/local/bin/nix. Fix by explicitly naming each link with basename of the original profile binary.
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Summary
Fixes the Nix installation in the devops image so it works at runtime when Coder mounts a persistent volume over
/home/coder.Problem
PR #15 installed Nix correctly at build time, but two things broke at runtime:
~/.config/nix/nix.conf(flakes config) — wiped by the home volume mount~/.nix-profile/bin(added to PATH viaENV) — the symlink doesn't exist on the mounted volume, sonixis not foundFix
nix.confto/etc/nix/nix.conf— system-wide config, outside the home directory/usr/local/bin/— at build time, resolve~/.nix-profile/bin/nix*through to the real/nix/store/…paths (which persist outside the home volume) and create symlinks in/usr/local/bin/which is already on$PATHENV PATH— no longer needed since/usr/local/binis already on the default PATH~/.config/nixcreation — replaced by the system-wide configWhy this works
/nix/(store + var) is outside the home volume and survives workspace restarts/etc/nix/nix.confis outside the home volume/usr/local/bin/is outside the home volumereadlink -fto resolve to absolute/nix/store/…paths, so they don't depend on~/.nix-profileexisting at runtime