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pkgmgr/scripts/pkgmgr-wrapper.sh
Kevin Veen-Birkenbach a3b21f23fc
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pkgmgr-wrapper: improve Nix detection and auto-initialization
- Extend PATH probing to include /home/nix/.nix-profile/bin/nix (container mode).
- Automatically invoke init-nix.sh when nix is not found before first run.
- Ensure pkgmgr always attempts a one-time Nix initialization instead of failing prematurely.
- Improve error message to clarify that nix was still missing *after* initialization attempt.
- Keep existing flake-based execution path unchanged (exec nix run …).

This makes the wrapper fully reliable across Debian/Ubuntu package installs,
fresh containers, and minimal systems where Nix is not yet initialized.

https://chatgpt.com/share/693b005d-b250-800f-8830-ab71685f51b3
2025-12-11 18:33:02 +01:00

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#!/usr/bin/env bash
set -euo pipefail
# Ensure NIX_CONFIG has our defaults if not already set
if [[ -z "${NIX_CONFIG:-}" ]]; then
export NIX_CONFIG="experimental-features = nix-command flakes"
fi
FLAKE_DIR="/usr/lib/package-manager"
# ---------------------------------------------------------------------------
# Try to ensure that "nix" is on PATH (common locations + container user)
# ---------------------------------------------------------------------------
if ! command -v nix >/dev/null 2>&1; then
CANDIDATES=(
"/nix/var/nix/profiles/default/bin/nix"
"${HOME:-/root}/.nix-profile/bin/nix"
"/home/nix/.nix-profile/bin/nix"
)
for candidate in "${CANDIDATES[@]}"; do
if [[ -x "$candidate" ]]; then
PATH="$(dirname "$candidate"):${PATH}"
export PATH
break
fi
done
fi
# ---------------------------------------------------------------------------
# If nix is still missing, try to run init-nix.sh once
# ---------------------------------------------------------------------------
if ! command -v nix >/dev/null 2>&1; then
if [[ -x "${FLAKE_DIR}/init-nix.sh" ]]; then
"${FLAKE_DIR}/init-nix.sh" || true
fi
fi
# ---------------------------------------------------------------------------
# Primary path: use Nix flake if available
# ---------------------------------------------------------------------------
if command -v nix >/dev/null 2>&1; then
exec nix run "${FLAKE_DIR}#pkgmgr" -- "$@"
fi
echo "[pkgmgr-wrapper] ERROR: 'nix' binary not found on PATH after init."
echo "[pkgmgr-wrapper] Nix is required to run pkgmgr (no Python fallback)."
exit 1