56 lines
1.5 KiB
Bash
56 lines
1.5 KiB
Bash
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#!/usr/bin/env bash
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set -euo pipefail
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# Prevent double-sourcing
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if [[ -n "${PKGMGR_NIX_CONF_FILE_SH:-}" ]]; then
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return 0
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fi
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PKGMGR_NIX_CONF_FILE_SH=1
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nixconf_file_path() {
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echo "/etc/nix/nix.conf"
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}
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nixconf_ensure_experimental_features() {
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local nix_conf want
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nix_conf="$(nixconf_file_path)"
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want="experimental-features = nix-command flakes"
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mkdir -p /etc/nix
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if [[ ! -f "${nix_conf}" ]]; then
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echo "[nix-conf] Creating ${nix_conf} with: ${want}"
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printf "%s\n" "${want}" >"${nix_conf}"
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return 0
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fi
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if grep -qE '^\s*experimental-features\s*=' "${nix_conf}"; then
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if grep -qE '^\s*experimental-features\s*=.*\bnix-command\b' "${nix_conf}" \
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&& grep -qE '^\s*experimental-features\s*=.*\bflakes\b' "${nix_conf}"; then
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echo "[nix-conf] experimental-features already correct"
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return 0
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fi
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echo "[nix-conf] Extending experimental-features in ${nix_conf}"
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local current
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current="$(grep -E '^\s*experimental-features\s*=' "${nix_conf}" | head -n1 | cut -d= -f2-)"
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current="$(echo "${current}" | xargs)" # trim
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# Build a merged feature string without duplicates (simple token set)
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local merged="nix-command flakes"
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local token
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for token in ${current}; do
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if [[ " ${merged} " != *" ${token} "* ]]; then
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merged="${merged} ${token}"
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fi
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done
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sed -i "s|^\s*experimental-features\s*=.*|experimental-features = ${merged}|" "${nix_conf}"
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return 0
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fi
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echo "[nix-conf] Appending to ${nix_conf}: ${want}"
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printf "\n%s\n" "${want}" >>"${nix_conf}"
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}
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