check_env函數解析，check_env解析

check_env函數解析，check_env解析

又是一個比較長的函數，是用來檢查檔案許可權，目錄條件的。具體代碼如下：

check_env(){    # Check user privilege.    #檢查使用者權限

    check_user root    # Check FQDN hostname.

    #檢查主機名稱是否符合規則    check_hostname    # Check config tool: dialog.

    #檢查組態工具dialog是否存在    check_pkg ${BIN_DIALOG} ${PKG_DIALOG}    ECHO_INFO -n "Checking configuration file: ${IREDMAIL_CONFIG_FILE} ..."    #判斷設定檔是否存在，預設的安裝包下是沒有的，應該是用於安裝中斷後，恢複安裝的。

    if [ -f ${IREDMAIL_CONFIG_FILE} ]; then        if grep '^#EOF$' ${IREDMAIL_CONFIG_FILE} >/dev/null; then            echo -e " [FOUND]"            ECHO_QUESTION -n "Use it for mail server setting? [y|N]"

                        #讀取已經存在的設定檔

            read_setting ${AUTO_USE_EXISTING_CONFIG_FILE}

            #給使用者一個選擇，是用已經存在的設定檔，還是重新安裝

            case $ANSWER in                Y|y )                    ECHO_INFO "Use config file: ${IREDMAIL_CONFIG_FILE} for mail server setting."                    . ${IREDMAIL_CONFIG_FILE}                    # Check installation status.                    # After each component installation was completed, there                    # should be a variable in ${STATUS_FILE}, e.g.                    #                    #   export STATUS_PHP_INSTALLATION='DONE'                    #   export STATUS_PHP_CONFIGURATION='DONE'                    #

                    #判斷狀態檔案是否存在，如果存在則讀取狀態檔案

                                    if [ -f ${STATUS_FILE} ]; then                        ECHO_INFO "Import installation process status from file: ${STATUS_FILE}."                        . ${STATUS_FILE}                    else                        echo '' > ${STATUS_FILE}                    fi                    # Initialize tip file.                    if [ ! -f ${TIP_FILE} ]; then                        cat > ${TIP_FILE} <<EOF${CONF_MSG}EOF                    fi                    ;;                N|n|* )                    ECHO_INFO "Skip configuration file: ${IREDMAIL_CONFIG_FILE}."                    . ${CONFIG_VIA_DIALOG}                    ;;            esac        else            ECHO_INFO "Found, but not finished."            . ${CONFIG_VIA_DIALOG}        fi    else        ECHO_INFO "[NOT FOUND]"        . ${CONFIG_VIA_DIALOG}    fi    check_runtime_dir}