#!/bin/sh
# Clawdie operator USB live seed importer.
# Reads operator-provided files from the FAT32 CLAWDIESEED partition
# (mountable on Linux/macOS/Windows pre- or post-flash) and installs them into
# the live system at every boot. Idempotent by design: editing the seed and
# rebooting re-applies it. Failure is never fatal — a missing/empty/unmountable
# seed logs and continues so the operator can still log in via SDDM.
#
# Two layers of contract (see clawdie-live-seed.README.txt for the operator view):
#   1. Legacy top-level allowlist: /authorized_keys, /ssh/authorized_keys.
#   2. Per-agent directories: /<agent-name>/ holding env, soul/, harness.toml,
#      ssh/authorized_keys. On the live USB (single agent) the first agent dir
#      maps to the clawdie user; on a deployed host the importer loops every dir
#      (multi-agent provisioning is a documented follow-up seam).
#
# SECURITY: this partition is plaintext FAT32. By operator decision the env
# files here may carry secrets (provider API keys, vault-bootstrap creds).
# Treat seeded sticks as secret-bearing media. The importer lands secrets 0600
# owned by the agent user and supports optional consume-and-shred (a /shred
# marker file on the seed) to wipe env files after import.
#
# Runs before LOGIN so sshd sees imported authorized_keys on first attach.

# PROVIDE: clawdie_live_seed
# REQUIRE: FILESYSTEMS devfs
# BEFORE: LOGIN
# KEYWORD: nojail

# rc.subr only exists on the FreeBSD target. Guard it so the import functions
# below can be sourced and unit-tested on a non-FreeBSD host (CLAWDIE_SEED_TEST=1).
if [ -r /etc/rc.subr ]; then
    . /etc/rc.subr
fi

name="clawdie_live_seed"
rcvar="${name}_enable"
start_cmd="${name}_start"
stop_cmd=":"
status_cmd="${name}_status"
extra_commands="status"

SEED_LABEL="CLAWDIESEED"
SEED_MOUNT="${SEED_MOUNT:-/mnt/clawdie-seed}"
SEED_LOG="${SEED_LOG:-/var/log/clawdie-live-seed.log}"
SEED_USER="${SEED_USER:-clawdie}"
SEED_USER_HOME="${SEED_USER_HOME:-/home/clawdie}"
# Where imported agent payloads are staged. Runtime consumption (loading a soul
# into the agent workspace cwd, launching the chosen harness) reads from here.
SEED_IMPORT_ROOT="${SEED_IMPORT_ROOT:-/var/db/clawdie/seed}"
# Directory names reserved at the seed root (not treated as agent dirs).
SEED_RESERVED_DIRS="ssh"
# Valid harness values mirror Colibri's AgentRuntime enum (colibri-glasspane).
SEED_VALID_HARNESSES="pi zot local"

_seed_log() {
    printf '%s %s\n' "$(date '+%Y-%m-%dT%H:%M:%S')" "$1" >>"${SEED_LOG}" 2>/dev/null || true
}

_seed_find_partition() {
    for _candidate in \
        "/dev/msdosfs/${SEED_LABEL}" \
        "/dev/gpt/${SEED_LABEL}" \
        "/dev/label/${SEED_LABEL}"
    do
        if [ -e "${_candidate}" ]; then
            echo "${_candidate}"
            return 0
        fi
    done

    if command -v gpart >/dev/null 2>&1; then
        gpart show -lp 2>/dev/null \
            | awk -v label="${SEED_LABEL}" '
                $0 ~ label {
                    for (i = 1; i <= NF; i++) {
                        if ($i ~ "^/dev/") { print $i; exit }
                    }
                }
            '
    fi
    return 0
}

_seed_install_authorized_keys() {
    _src="$1"
    _user="${2:-${SEED_USER}}"
    _home="${3:-${SEED_USER_HOME}}"

    _ssh_dir="${_home}/.ssh"
    _dst="${_ssh_dir}/authorized_keys"

    mkdir -p "${_ssh_dir}"
    chown "${_user}:${_user}" "${_ssh_dir}" 2>/dev/null || true
    chmod 0700 "${_ssh_dir}"

    # Strip CRLF so keys created on Windows/Linux editors don't get rejected
    # by sshd for trailing whitespace.
    tr -d '\r' <"${_src}" >"${_dst}.new"
    mv -f "${_dst}.new" "${_dst}"
    chown "${_user}:${_user}" "${_dst}" 2>/dev/null || true
    chmod 0600 "${_dst}"

    _seed_log "installed authorized_keys from ${_src} -> ${_dst}"
}

# Merge KEY=VALUE pairs from a plaintext env file into a target .env, preserving
# keys the source does not mention and replacing those it does. Lands 0600 owned
# by the agent user. Mirrors clawdie-vault-fetch's --write-env upsert.
_seed_import_env() {
    _src="$1"
    _dst="$2"
    _user="${3:-${SEED_USER}}"

    [ -f "${_src}" ] || return 0

    mkdir -p "$(dirname "${_dst}")"
    touch "${_dst}"
    chmod 0600 "${_dst}"

    _merged="${_dst}.seedmerge"
    cp "${_dst}" "${_merged}" 2>/dev/null || : >"${_merged}"

    _count=0
    while IFS= read -r _line || [ -n "${_line}" ]; do
        # Skip blanks, comments, and lines without a KEY=.
        case "${_line}" in
            ''|'#'*) continue ;;
            *=*) : ;;
            *) continue ;;
        esac
        _line="$(printf '%s' "${_line}" | tr -d '\r')"
        _k="${_line%%=*}"
        grep -v "^${_k}=" "${_merged}" >"${_merged}.tmp" 2>/dev/null || : >"${_merged}.tmp"
        mv "${_merged}.tmp" "${_merged}"
        printf '%s\n' "${_line}" >>"${_merged}"
        _count=$((_count + 1))
    done <"${_src}"

    cp "${_merged}" "${_dst}"
    chmod 0600 "${_dst}"
    chown "${_user}:${_user}" "${_dst}" 2>/dev/null || true
    rm -f "${_merged}"
    _seed_log "imported ${_count} env key(s) from ${_src} -> ${_dst}"
}

# Validate + record a harness descriptor. We only parse the `harness` value to
# sanity-check it against the AgentRuntime enum; the full file is staged as-is
# for the runtime to read.
_seed_import_harness() {
    _src="$1"
    _stage="$2"

    [ -f "${_src}" ] || return 0

    _h="$(grep -E '^[[:space:]]*harness[[:space:]]*=' "${_src}" 2>/dev/null \
        | head -n 1 | sed -E 's/^[^=]*=[[:space:]]*"?([A-Za-z]+)"?.*/\1/' | tr 'A-Z' 'a-z')"
    _ok=0
    for _v in ${SEED_VALID_HARNESSES}; do
        [ "${_h}" = "${_v}" ] && _ok=1
    done
    if [ "${_ok}" -ne 1 ]; then
        _seed_log "WARN harness '${_h:-<none>}' in ${_src} not in {${SEED_VALID_HARNESSES}} — recording anyway"
    fi

    mkdir -p "${_stage}"
    cp "${_src}" "${_stage}/harness.toml" 2>/dev/null || true
    _seed_log "recorded harness '${_h:-<none>}' -> ${_stage}/harness.toml"
}

# Stage a soul/ backup tree for later consumption by the agent workspace.
_seed_import_soul() {
    _src="$1"
    _stage="$2"

    [ -d "${_src}" ] || return 0

    mkdir -p "${_stage}/soul"
    # cp -R is portable; the tree is small (layered-soul ~600 KB).
    cp -R "${_src}/." "${_stage}/soul/" 2>/dev/null || true
    _seed_log "staged soul backup ${_src} -> ${_stage}/soul"
}

# Import one /<agent-name>/ directory. On the live USB this is called once with
# the clawdie user/home as the target; on a deployed host the caller loops.
_seed_import_agent_dir() {
    _dir="$1"      # absolute path to the agent dir on the mounted seed
    _agent="$2"    # agent name (already validated)
    _user="$3"
    _home="$4"

    _stage="${SEED_IMPORT_ROOT}/${_agent}"
    mkdir -p "${_stage}"
    printf '%s\n' "${_agent}" >"${_stage}/agent-name" 2>/dev/null || true

    _seed_import_env     "${_dir}/env"                "${_home}/.env" "${_user}"
    _seed_import_harness "${_dir}/harness.toml"       "${_stage}"
    _seed_import_soul    "${_dir}/soul"               "${_stage}"
    if [ -f "${_dir}/ssh/authorized_keys" ]; then
        _seed_install_authorized_keys "${_dir}/ssh/authorized_keys" "${_user}" "${_home}"
    fi

    _seed_log "imported agent dir '${_agent}' -> stage ${_stage}, user ${_user}"
}

# Return 0 if NAME is a safe agent directory name (no traversal, not reserved).
_seed_agent_name_ok() {
    _n="$1"
    case "${_n}" in
        ''|.|..|*/*) return 1 ;;
    esac
    # Allowlist characters to keep this off the filesystem's sharp edges.
    case "${_n}" in
        *[!A-Za-z0-9._-]*) return 1 ;;
    esac
    for _r in ${SEED_RESERVED_DIRS}; do
        [ "${_n}" = "${_r}" ] && return 1
    done
    return 0
}

# Core import routine, factored out of the rc start_cmd so it can be tested
# against a pre-mounted directory (CLAWDIE_SEED_TEST). Operates on $SEED_MOUNT.
_seed_import_tree() {
    _imported=0

    # Layer 1: legacy top-level authorized_keys (default clawdie user).
    if [ -f "${SEED_MOUNT}/ssh/authorized_keys" ]; then
        _seed_install_authorized_keys "${SEED_MOUNT}/ssh/authorized_keys"
        _imported=1
    elif [ -f "${SEED_MOUNT}/authorized_keys" ]; then
        _seed_install_authorized_keys "${SEED_MOUNT}/authorized_keys"
        _imported=1
    fi

    # Layer 2: per-agent directories. On the live USB (single agent) the first
    # valid dir, sorted, maps to the clawdie user. Additional dirs are staged
    # but flagged: deployed multi-agent provisioning is the follow-up seam.
    _first=1
    for _entry in "${SEED_MOUNT}"/*; do
        [ -d "${_entry}" ] || continue
        _agent="$(basename "${_entry}")"
        if ! _seed_agent_name_ok "${_agent}"; then
            [ "${_agent}" = "ssh" ] || _seed_log "skipping non-agent dir '${_agent}'"
            continue
        fi

        if [ "${_first}" -eq 1 ]; then
            _seed_import_agent_dir "${_entry}" "${_agent}" "${SEED_USER}" "${SEED_USER_HOME}"
            printf '%s\n' "${_agent}" >"${SEED_IMPORT_ROOT}/active-agent" 2>/dev/null || true
            _first=0
            _imported=1
        else
            # Stage payload for visibility but do not provision a second live
            # identity — the live USB is single-agent.
            _seed_import_agent_dir "${_entry}" "${_agent}" "${SEED_USER}" "${SEED_USER_HOME}.${_agent}"
            _seed_log "NOTE additional agent dir '${_agent}' staged; deployed multi-agent provisioning not yet wired"
        fi
    done

    if [ "${_imported}" -eq 0 ]; then
        _seed_log "no allowlisted files or agent dirs on seed — nothing to import"
    fi
    return 0
}

clawdie_live_seed_start() {
    : >>"${SEED_LOG}" 2>/dev/null || true
    mkdir -p "${SEED_IMPORT_ROOT}" 2>/dev/null || true

    _dev=$(_seed_find_partition)
    if [ -z "${_dev:-}" ]; then
        _seed_log "no ${SEED_LABEL} partition found — skipping import"
        return 0
    fi

    mkdir -p "${SEED_MOUNT}"
    if ! mount -t msdosfs -o ro "${_dev}" "${SEED_MOUNT}" 2>>"${SEED_LOG}"; then
        _seed_log "mount failed on ${_dev} — skipping import"
        return 0
    fi

    _seed_import_tree

    # Optional consume-and-shred: a /shred marker on the seed asks us to wipe
    # env files after import so secrets do not persist on the stick. Requires a
    # brief RW remount; off unless the operator opts in per stick.
    if [ -f "${SEED_MOUNT}/shred" ]; then
        umount "${SEED_MOUNT}" 2>/dev/null || true
        if mount -t msdosfs "${_dev}" "${SEED_MOUNT}" 2>>"${SEED_LOG}"; then
            find "${SEED_MOUNT}" -name env -type f -exec rm -f {} + 2>/dev/null || true
            rm -f "${SEED_MOUNT}/shred" 2>/dev/null || true
            _seed_log "consume-and-shred: wiped env files from seed"
        else
            _seed_log "consume-and-shred requested but RW remount failed — env left on seed"
        fi
    fi

    umount "${SEED_MOUNT}" 2>/dev/null || true
    return 0
}

clawdie_live_seed_status() {
    if [ -s "${SEED_LOG}" ]; then
        echo "${name}: one-shot importer; last run log tail:"
        tail -n 5 "${SEED_LOG}"
        return 0
    fi
    echo "${name}: not yet run this boot (no log at ${SEED_LOG})"
    return 1
}

# On FreeBSD, hand off to rc.subr. Under test (no rc.subr / CLAWDIE_SEED_TEST),
# skip it so the functions above can be exercised directly.
if [ -n "${CLAWDIE_SEED_TEST:-}" ]; then
    :
elif command -v run_rc_command >/dev/null 2>&1; then
    load_rc_config "$name"
    : "${clawdie_live_seed_enable:=YES}"
    run_rc_command "$1"
fi