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upgrade-nix: resolve profile symlinks
The profile present in PATH is not necessarily the actual profile location. User profiles are generally added as $HOME/.nix-profile in which case the indirect profile link needs to be resolved first. /home/user/.nix-profile -> /nix/var/nix/profiles/per-user/user/profile /nix/var/nix/profiles/per-user/user/profile -> profile-15-link /nix/var/nix/profiles/per-user/user/profile-14-link -> /nix/store/hyi4kkjh3bwi2z3wfljrkfymz9904h62-user-environment /nix/var/nix/profiles/per-user/user/profile-15-link -> /nix/store/6njpl3qvihz46vj911pwx7hfcvwhifl9-user-environment To upgrade nix here we want /nix/var/nix/profiles/per-user/user/profile-16-link instead of /home/user/.nix-profile-1-link. The latter is not a gcroot and would be garbage collected, resulting in a broken profile. Fixes #2175
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