晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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Current File : //lib/dracut/modules.d/98integrity/ima-keys-load.sh
#!/usr/bin/sh

SECURITYFSDIR="/sys/kernel/security"
IMASECDIR="${SECURITYFSDIR}/ima"
IMACONFIG="${NEWROOT}/etc/sysconfig/ima"

load_x509_keys() {
    KEYRING_ID=$1

    # override the default configuration
    if [ -f "${IMACONFIG}" ]; then
        # shellcheck disable=SC1090
        . "${IMACONFIG}"
    fi

    if [ -z "${IMAKEYSDIR}" ]; then
        IMAKEYSDIR="/etc/keys/ima"
    fi

    for PUBKEY in "${NEWROOT}${IMAKEYSDIR}"/*; do
        # check for public key's existence
        if [ ! -f "${PUBKEY}" ]; then
            if [ "${RD_DEBUG}" = "yes" ]; then
                info "integrity: IMA x509 cert file not found: ${PUBKEY}"
            fi
            continue
        fi

        # FIXME: X509ID unused?
        # shellcheck disable=SC2034
        if ! X509ID=$(evmctl import "${PUBKEY}" "${KEYRING_ID}"); then
            info "integrity: IMA x509 cert not loaded on keyring: ${PUBKEY}"
        fi
    done

    if [ "${RD_DEBUG}" = "yes" ]; then
        keyctl show "${KEYRING_ID}"
    fi
    return 0
}

# check kernel support for IMA
if [ ! -e "${IMASECDIR}" ]; then
    if [ "${RD_DEBUG}" = "yes" ]; then
        info "integrity: IMA kernel support is disabled"
    fi
    return 0
fi

# get the IMA keyring id

if line=$(keyctl describe %keyring:.ima); then
    _ima_id=${line%%:*}
else
    _ima_id=$(keyctl search @u keyring _ima)
    if [ -z "${_ima_id}" ]; then
        _ima_id=$(keyctl newring _ima @u)
    fi
fi

# load the IMA public key(s)
load_x509_keys "${_ima_id}"