Persist CA bundle configuration on CentOS for Nix and HTTPS tools

Move CA bundle detection from the Docker entrypoint to CentOS dependencies and persist it system-wide.
This ensures Nix, Git, curl, and Python HTTPS access works in virgin environments by configuring `/etc/profile.d` and `/etc/nix/nix.conf`.
Removes runtime-only CA exports from the container entrypoint and makes the setup reproducible and distro-correct.

https://chatgpt.com/share/693c5ddf-3260-800f-ac94-38c635dba307

scripts/docker/entry.sh

@@ -1,53 +1,6 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-# ---------------------------------------------------------------------------
-# Detect and export a valid CA bundle so Nix, Git, curl and Python tooling
-# can successfully perform HTTPS requests on all distros (Debian, Ubuntu,
-# Fedora, RHEL, CentOS, etc.)
-# ---------------------------------------------------------------------------
-detect_ca_bundle() {
-  # Common CA bundle locations across major Linux distributions
-  local candidates=(
-    /etc/ssl/certs/ca-certificates.crt                       # Debian/Ubuntu
-    /etc/ssl/cert.pem                                       # Some distros
-    /etc/pki/tls/certs/ca-bundle.crt                        # Fedora/RHEL/CentOS
-    /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem       # CentOS/RHEL extracted bundle
-    /etc/ssl/ca-bundle.pem                                  # Generic fallback
-  )
-
-  for path in "${candidates[@]}"; do
-    if [[ -f "$path" ]]; then
-      echo "$path"
-      return 0
-    fi
-  done
-
-  return 1
-}
-
-# Use existing NIX_SSL_CERT_FILE if provided, otherwise auto-detect
-CA_BUNDLE="${NIX_SSL_CERT_FILE:-}"
-
-if [[ -z "${CA_BUNDLE}" ]]; then
-  CA_BUNDLE="$(detect_ca_bundle || true)"
-fi
-
-if [[ -n "${CA_BUNDLE}" ]]; then
-  # Export for Nix (critical)
-  export NIX_SSL_CERT_FILE="${CA_BUNDLE}"
-
-  # Export for Git, Python requests, curl, etc.
-  export SSL_CERT_FILE="${CA_BUNDLE}"
-  export REQUESTS_CA_BUNDLE="${CA_BUNDLE}"
-  export GIT_SSL_CAINFO="${CA_BUNDLE}"
-
-  echo "[docker] Using CA bundle: ${CA_BUNDLE}"
-else
-  echo "[docker] WARNING: No CA certificate bundle found."
-  echo "[docker] HTTPS access for Nix flakes and other tools may fail."
-fi
-
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 echo "[docker] Starting package-manager container"

scripts/installation/centos/dependencies.sh

@@ -13,10 +13,64 @@ dnf -y install \
   bash \
   curl-minimal \
   ca-certificates \
-  python3.11 \
+  python3 \
   sudo \
   xz
 
 dnf clean all
 
+# -----------------------------------------------------------------------------
+# Persist CA bundle configuration system-wide (virgin-compatible)
+# -----------------------------------------------------------------------------
+detect_ca_bundle() {
+  local candidates=(
+    /etc/pki/tls/certs/ca-bundle.crt
+    /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem
+    /etc/ssl/certs/ca-certificates.crt
+    /etc/ssl/cert.pem
+    /etc/ssl/ca-bundle.pem
+  )
+
+  for path in "${candidates[@]}"; do
+    if [[ -f "$path" ]]; then
+      echo "$path"
+      return 0
+    fi
+  done
+
+  return 1
+}
+
+CA_BUNDLE="$(detect_ca_bundle || true)"
+
+if [[ -n "${CA_BUNDLE}" ]]; then
+  echo "[centos/dependencies] Persisting CA bundle: ${CA_BUNDLE}"
+
+  # 1) Make it available for login shells
+  cat >/etc/profile.d/pkgmgr-ca.sh <<EOF
+# Generated by package-manager
+export NIX_SSL_CERT_FILE="${CA_BUNDLE}"
+export SSL_CERT_FILE="${CA_BUNDLE}"
+export REQUESTS_CA_BUNDLE="${CA_BUNDLE}"
+export GIT_SSL_CAINFO="${CA_BUNDLE}"
+EOF
+  chmod 0644 /etc/profile.d/pkgmgr-ca.sh
+
+  # 2) Ensure Nix uses it even without environment variables
+  mkdir -p /etc/nix
+  if [[ -f /etc/nix/nix.conf ]]; then
+    # Replace existing ssl-cert-file or append it
+    if grep -qE '^\s*ssl-cert-file\s*=' /etc/nix/nix.conf; then
+      sed -i "s|^\s*ssl-cert-file\s*=.*|ssl-cert-file = ${CA_BUNDLE}|" /etc/nix/nix.conf
+    else
+      echo "ssl-cert-file = ${CA_BUNDLE}" >>/etc/nix/nix.conf
+    fi
+  else
+    echo "ssl-cert-file = ${CA_BUNDLE}" >/etc/nix/nix.conf
+  fi
+
+else
+  echo "[centos/dependencies] WARNING: No CA bundle found after installing ca-certificates."
+fi
+
 echo "[centos/dependencies] Done."