#! /bin/sh

BUILDBASE="@BUILDBASE@"
EGDIR="@EGDIR@"
PKG_COMP_HOME="@PKG_COMP_HOME@"
PKG_COMP_USER="@PKG_COMP_USER@"
PKG_COMP_EGDIR="@PKG_COMP_EGDIR@"
SANDBOXCTL_EGDIR="@SANDBOXCTL_EGDIR@"

# Regexp to match our crontab entry.
CRONTAB_RE="${PREFIX}/sbin/pkg_comp4cron .*${BUILDBASE}/pkg_comp.conf"

# Dumps the pkg_comp user's crontab to a temporary file and outputs
# the path to the file.  If the crontab does not exist, populates
# the output with some basic contents.
get_crontab() {
    local tempfile="$(mktemp "${TMPDIR:-/tmp}/pkg_comp.XXXXXX")"
    if ! crontab -u "${PKG_COMP_USER}" -l >>"${tempfile}"; then
        cat >>"${tempfile}" <<EOF
PATH=${PREFIX}/bin:${PREFIX}/sbin:/usr/bin:/usr/sbin:/bin:/sbin
SHELL=/bin/sh

# Cheatsheet: minute hour day-of-month month day-of-week(0,7=Sun)
EOF
    fi
    echo "${tempfile}"
}

# Adds an entry to for pkg_comp to the crontab if not yet present.
install_crontab() {
    local tempfile; tempfile="$(get_crontab)" || return
    if ! grep "${CRONTAB_RE}" "${tempfile}" >/dev/null; then
        echo "@daily ${PREFIX}/sbin/pkg_comp4cron -l \"${BUILDBASE}/log\"" \
            "-- -c \"${BUILDBASE}/pkg_comp.conf\" auto" \
            >>"${tempfile}"
        crontab -u "${PKG_COMP_USER}" - <"${tempfile}"
        echo "pkg_comp daily entry added to ${PKG_COMP_USER}'s crontab"
    fi
    rm -f "${tempfile}"
}

# Removes the previously-configured crontab entry by this package.
uninstall_crontab() {
    local tempfile; tempfile="$(get_crontab)" || return
    if grep "${CRONTAB_RE}" "${tempfile}" >/dev/null; then
        local tempfile2="$(mktemp "${TMPDIR:-/tmp}/pkg_comp.XXXXXX")"
        grep -v "${CRONTAB_RE}" "${tempfile}" >>"${tempfile2}"
        if [ -s "${tempfile2}" ]; then
            crontab -u "${PKG_COMP_USER}" "${tempfile2}"
        else
            crontab -u "${PKG_COMP_USER}" -r
        fi
        echo "pkg_comp daily entry removed from ${PKG_COMP_USER}'s crontab"
        rm -f "${tempfile2}"
    fi
    rm -f "${tempfile}"
}

case "${STAGE}" in
    POST-INSTALL)
        if [ ! -e "${PKG_COMP_HOME}/sandbox.conf" ]; then
            echo "${PKGNAME}: Installing sample sandbox.conf file"
            ${MKDIR} -p "${PKG_COMP_HOME}"
            sed "s,^SANDBOX_ROOT=.*$,SANDBOX_ROOT=${PKG_COMP_HOME}/sandbox," \
                "${SANDBOXCTL_EGDIR}/default.conf" \
                >"${PKG_COMP_HOME}/sandbox.conf"
        fi

        if [ ! -e "${PKG_COMP_HOME}/extra.mk.conf" ]; then
            echo "${PKGNAME}: Installing sample extra.mk.conf file"
            ${MKDIR} -p "${PKG_COMP_HOME}"
            cp "${PKG_COMP_EGDIR}/extra.mk.conf" "${PKG_COMP_HOME}/"
        fi

        install_crontab
        ;;

    DEINSTALL)
        uninstall_crontab
        ;;
esac