tvl-depot/bin/__dispatch.sh
Griffin Smith a73714a93c feat(ops/nixos): Add generic rebuild-system script
This adds a first crack at one idea for a generic, non-user-specific
rebuild-system script to ops.nixos.rebuild-system. The idea here is that
we enumerate all the nixos systems stored in the monorepo (similarly to
what we do for ci-builds right now) then search through them by hostname
to find the one matching the hostname of the current system, which is an
attempt at a more generic version of tazjin's rebuilder script which
does the same thing but with an explicit case block.

As a caveat, it feels like there's a slight possibility that this way of
finding systems is going to get slow to evaluate - on my system it feels
fine but if it grows out of hand it's probably feasible to just bake
this into the built script as a dynamically generated case statement.

Change-Id: I2e4c5401913b6f4d936ab48ba2f95f96e0e78eb4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/894
Tested-by: BuildkiteCI
Reviewed-by: lukegb <lukegb@tvl.fyi>
2020-07-06 15:16:36 +00:00

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#!/usr/bin/env bash
# This script dispatches invocations transparently to programs instantiated from
# Nix.
#
# To add a new tool, insert it into the case statement below by setting `attr`
# to the key in nixpkgs which represents the program you want to run.
set -ueo pipefail
readonly REPO_ROOT=$(dirname "$0")/..
TARGET_TOOL=$(basename "$0")
case "${TARGET_TOOL}" in
terraform)
attr="third_party.terraform-gcp"
;;
kontemplate)
attr="kontemplate"
;;
stern)
attr="third_party.stern"
;;
aoc2019)
attr="fun.aoc2019.${1}"
;;
rink)
attr="third_party.rink"
;;
age)
attr="third_party.age"
;;
age-keygen)
attr="third_party.age"
;;
rebuilder)
attr="users.tazjin.nixos.rebuilder"
;;
meson)
attr="third_party.meson"
;;
ninja)
attr="third_party.ninja"
;;
git-bug)
attr="third_party.git-bug"
;;
depot-build)
attr="tools.depot-build"
;;
gerrit)
attr="tools.gerrit-cli"
;;
hash-password)
attr="tools.hash-password"
;;
rebuild-system)
attr="ops.nixos.rebuild-system"
;;
*)
echo "The tool '${TARGET_TOOL}' is currently not installed in this repository."
exit 1
;;
esac
result=$(nix-build --no-out-link --attr "${attr}" "${REPO_ROOT}")
PATH="${result}/bin:$PATH"
exec "${TARGET_TOOL}" "${@}"