#!/usr/bin/env bash
set -euo pipefail

root="$(cd "$(dirname "$0")/.." && pwd)"
install_dir="${LAZARET_INSTALL_DIR:-$HOME/.local/bin}"

usage() {
    printf '%s\n' "usage: tools/install-to-host [--install-dir DIRECTORY]"
}

if [ "${1:-}" = "--help" ] && [ "$#" -eq 1 ]; then
    usage
    exit 0
elif [ "${1:-}" = "--install-dir" ] && [ "$#" -eq 2 ]; then
    install_dir="$2"
elif [ "$#" -ne 0 ]; then
    usage >&2
    exit 2
fi

for command in cargo cmp install readelf; do
    command -v "$command" >/dev/null 2>&1 || {
        printf '%s\n' "install-to-host: $command is required" >&2
        exit 1
    }
done

cd "$root"
tools/materialize-fuser
tools/materialize-runsc --build
cargo build \
    --release \
    --locked \
    --package lazaret-client \
    --package lazaret-host-coordinator \
    --package lazaret-escalation-client \
    --bins
env RUSTFLAGS="-C relocation-model=static -C link-arg=-no-pie" cargo build \
    --release \
    --locked \
    --target x86_64-unknown-linux-musl \
    --package lazaret-sandbox-init \
    --bin lazaret-sandbox-init

target_dir="${CARGO_TARGET_DIR:-target}"
if [[ "$target_dir" != /* ]]; then
    target_dir="$root/$target_dir"
fi

install -d -m 755 "$install_dir"
for executable in lazaret lazaret-host-coordinator lazaret-escalation-client; do
    install -m 755 "$target_dir/release/$executable" "$install_dir/$executable"
done
sandbox_init="$target_dir/x86_64-unknown-linux-musl/release/lazaret-sandbox-init"
if readelf -l "$sandbox_init" | grep -q 'Requesting program interpreter' ||
    ! readelf -d "$sandbox_init" 2>&1 | grep -q 'There is no dynamic section'; then
    printf '%s\n' "install-to-host: sandbox init is dynamically linked" >&2
    exit 1
fi
install -m 755 "$sandbox_init" "$install_dir/lazaret-sandbox-init"

runsc_build_id=5b441d02d40792cfe228b294fb688a80cf6161fb6876d49ef03138618ae2562e
runsc_name="lazaret-runsc-$runsc_build_id"
runsc_source="$root/.lazaret/bin/$runsc_name"
runsc_destination="$install_dir/$runsc_name"
if [[ -e "$runsc_destination" ]]; then
    cmp --silent "$runsc_source" "$runsc_destination" || {
        printf '%s\n' "install-to-host: immutable runsc destination differs: $runsc_destination" >&2
        exit 1
    }
else
    install -m 755 "$runsc_source" "$runsc_destination"
fi

printf '%s\n' "Installed Lazaret in $install_dir"