add misc/upgrade-lix.sh wrapper script, for nix-daemon@.service checks

Change-Id: I073b753f24e24eefe9d8f68543c4d1be6a6a6964
2026-03-09 22:28:51 +01:00
parent 8c03cc961f
commit 861e5a7471
1 changed files with 132 additions and 0 deletions
@@ -0,0 +1,132 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+function eprintln()
+{
+    printf "%s\n" "$@" >&2
+}
+
+ANSI_YELLOW=$'\x1b[33m'
+ANSI_RESET=$'\x1b[0m'
+
+function printUsage()
+{
+    echo "usage: upgrade-lix.sh <latest-tag>"
+    echo
+    echo "e.g.: ./upgrade-lix.sh 2.95"
+}
+
+function checkSystemdService()
+{
+    # Check if we have systemd.
+    local SYSTEMCTL
+    if command -v systemctl >/dev/null 2>&1; then
+        SYSTEMCTL="$(command -v systemctl)"
+    else
+        # Try /usr/bin, in case PATH is on vacation.
+        if [[ -x /usr/bin/systemctl ]]; then
+            SYSTEMCTL="/usr/bin/systemctl"
+        else
+            # If there's really no systemctl, then this is probably not a systemd system.
+            # On non-systemd systems, there's no issue.
+            # Exit with success.
+            return 0
+        fi
+    fi
+
+    if "$SYSTEMCTL" cat nix-daemon@.service --no-pager >/dev/null 2>&1; then
+        # The instanced daemon service unit exists, so we're good.
+        return 0
+    fi
+
+    # Juuuust in case something unusual went wrong with the systemctl call,
+    # we'll do one more check. This could maybe happen if someone put the file
+    # in place but hasn't `daemon-reload`ed yet. Maybe.
+    if [[ -e /etc/systemd/system/nix-daemon@.service ]]; then
+        return 0
+    fi
+
+    # If we got here then we DO have systemd but we do NOT have nix-daemon@.service.
+    # AKA: the bad case.
+    eprintln "${ANSI_YELLOW}WARNING${ANSI_RESET}: manual intervention will be required to complete this Lix install!"
+    eprintln "The Lix daemon is now an instanced unit that is fully socket-activated."
+    eprintln
+    eprintln "This requires a new systemd unit: nix-daemon@.service"
+    eprintln
+    eprintln "'nix upgrade-nix' will provide a profile with a new Lix, likely one of:"
+    eprintln "  /nix/var/nix/profiles/default"
+    eprintln "  /nix/var/nix/profiles/per-user/root/profile"
+    eprintln "It will have the instanced systemd unit file at 'lib/systemd/system/nix-daemon@.service'"
+    eprintln
+    eprintln "You should symlink or copy this file to '/etc/systemd/system/nix-daemon@.service',"
+    eprintln "and then run 'systemctl daemon-reload && systemctl restart nix-daemon.socket'."
+    eprintln "Until you do that, all nix commands will require root and '--store local'."
+    eprintln
+
+    local RESPONSE
+    # Single-character read with a prompt, for a traditional y/n prompt.
+    read -er -N 1 -p "Procede with installation? [y/N] " RESPONSE
+
+    # Lowercase the respose before comparing: Y and y are both "yes".
+    # Anything else is "no".
+    if [[ "${RESPONSE@L}" = "y" ]]; then
+        return 0
+    fi
+
+    eprintln "Installation cancelled!"
+    exit 1
+}
+
+# We take only one argument.
+# If that argument looks "help"-y, then we should print usage instead.
+if [[ "$#" -eq 1 ]]; then
+    case "$1" in
+        -h|-H|-?|*help*)
+            printUsage
+            exit 0
+        ;;
+    esac
+else
+    printUsage
+    exit 0
+fi
+
+LIX_VERSION="$1"
+# Let people override these if they reeeeeeally need to...
+LIX_REF="${LIX_REF:-refs/tags/$LIX_VERSION}"
+LIX_BASE="${LIX_BASE:-"git+https://git.lix.systems/lix-project/lix"}"
+
+if [[ "$EUID" != 0 ]]; then
+    eprintln "Please run this script as root."
+    eprintln "If you use sudo, make sure your PATH environment variable is kept with '--preserve-env=PATH'."
+    exit 2
+fi
+
+if ! command -v nix >/dev/null 2>&1; then
+    eprintln "Couldn't find a 'nix' in your PATH: '$PATH'"
+    eprintln "If you're running with sudo, make sure PATH is preserved with '--preserve-env=PATH'."
+    eprintln "If you're passing '--preserve-env=PATH', check /etc/sudoers for 'env_reset' and 'env_keep'."
+    eprintln "If you cannot modify that, run this script from a root shell, instead of directly from sudo."
+    exit 3
+fi
+
+NIX="${NIX:-$(command -v nix)}"
+
+declare -a SUBSTITUTER_ARGS=(
+    "--extra-substituters"
+    "https://cache.lix.systems"
+    "--extra-trusted-public-keys"
+    "cache.lix.systems:aBnZUw8zA7H35Cz2RyKFVs3H4PlGTLawyY5KRbvJR8o="
+)
+
+checkSystemdService
+
+set -x
+exec "$NIX" run \
+    --extra-experimental-features "nix-command flakes" \
+    "${SUBSTITUTER_ARGS[@]}" \
+    "${LIX_BASE}?ref=${LIX_REF}" \
+    --extra-experimental-features "nix-command flakes" \
+    upgrade-nix \
+    "${SUBSTITUTER_ARGS[@]}"