ti processor sdk linux am335x evm /bin/setup-package-install.sh hacking

#!/bin/sh

#
#   ti processor sdk linux am335x evm /bin/setup-package-install.sh hacking
# 说明：
#     本文主要对TI的sdk中的setup-package-install.sh脚本进行解读，是为了了解
# 其工作机制。
#
#                                      2016-4-16 深圳 南山平山村 曾剑锋

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# as follows:
#
# Copyright (c) 2010, Texas Instruments Incorporated
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# modification, are permitted provided that the following conditions
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# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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cwd=`dirname $0`
. $cwd/common.sh

entry_header() {
cat << EOF
-------------------------------------------------------------------------------
setup package script
This script will make sure you have the proper host support packages installed
This script requires administrator priviliges (sudo access) if packages are to be installed.
-------------------------------------------------------------------------------
EOF
}

exit_footer() {
cat << EOF
--------------------------------------------------------------------------------
Package verification and installation successfully completed
--------------------------------------------------------------------------------
EOF
}

cwd=`dirname $0`
. $cwd/common.sh

entry_header

packages_to_install="xinetd tftpd nfs-kernel-server minicom build-essential libncurses5-dev autoconf automake"

get_host_type host

# Starting with Ubuntu 14.04 the package name for uboot-mkimage has changed
# to u-boot-tools

if [ "$host" = "trusty" ]; then
    packages_to_install="$packages_to_install u-boot-tools"
else
    packages_to_install="$packages_to_install uboot-mkimage"

fi

cmd="sudo apt-get install "

# 合成需要安装的工具包
# Check and only install the missing packages
for i in $packages_to_install; do
    is_it_installed=`dpkg-query -l $i 2>/dev/null`
    if [ "$?" -ne "0" ]; then
        needs_installation=`echo $needs_installation`" "$i
        new_cmd=`echo $cmd`" "$i    # 每次将需要安装的包加载当前的cmd字符串后面
        cmd=$new_cmd
    fi
done

if [ "$needs_installation" = "" ]; then
    echo "System has required packages!"
else
    echo "System requires packages $needs_installation to be installed"

    echo "Installation requires you to have administrator priviliges (sudo access) "
    echo "on your host. Do you have administrator privilieges?"

    # Force the user to answer.  Maybe the user does not want to continue
    while true;
    do
        read -p "Type ‘y‘ to continue or ‘n‘ to exit the installation: " REPLY
        if [ "$REPLY" = ‘y‘ -o "$REPLY" = ‘n‘ ]; then
            break;
        fi
    done

    if [ "$REPLY" = ‘n‘ ]; then
        echo "Installation is aborted by user"
        exit 1
    fi

    # 执行并安装程序
    echo "Performing $cmd"
    $cmd
    check_status
fi
# Print the exit statement to the console
exit_footer