nixpkgs/upgrade.sh

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#! /bin/sh -e
if test -z "$NIXOS"; then NIXOS=/etc/nixos/nixos; fi
if test -z "$NIXOS_CONFIG"; then NIXOS_CONFIG=/etc/nixos/configuration.nix; fi
nix-env -p /nix/var/nix/profiles/system -f $NIXOS/system/system.nix \
--arg configuration "import $NIXOS_CONFIG" \
--set -A system
/nix/var/nix/profiles/system/bin/switch-to-configuration switch