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

#!/bin/sh

#
#      ti processor sdk linux am335x evm /bin/setup-tftp.sh hacking
# 说明：
#     本文主要对TI的sdk中的setup-tftp.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

# This distribution contains contributions or derivatives under copyright
# as follows:
#
# Copyright (c) 2010, Texas Instruments Incorporated
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# 获取当前工作路径，并执行common.sh，是为了使用里面的函数
cwd=`dirname $0`
. $cwd/common.sh

# tftp配置文件路径
tftpcfg=/etc/xinetd.d/tftp
# tftp根目录路径
tftprootdefault=/tftpboot

# 创建tftpcfg文件，并将设定好的配置放入里面；
tftp() {
    echo "
service tftp
{
protocol = udp
port = 69
socket_type = dgram
wait = yes
user = nobody
server = /usr/sbin/in.tftpd
server_args = $tftproot
disable = no
}
" | sudo tee $tftpcfg > /dev/null
     check_status
     echo
     echo "$tftpcfg successfully created"
}

echo "--------------------------------------------------------------------------------"
echo "Which directory do you want to be your tftp root directory?(if this directory does not exist it will be created for you)"
# 采用默认的tftproot还是自定义路径，有这部分决定。
read -p "[ $tftprootdefault ] " tftproot

if [ ! -n "$tftproot" ]; then
    tftproot=$tftprootdefault
fi
#
# 1. 查看结果：
#     Qt@aplex:~/ti-processor-sdk-linux-am335x-evm-01.00.00.00$ ls -al
#     total 294792
#     ......
#     -rw-rw-r--  1 Qt   Qt          10 Aug 14  2015 .tftproot
#     Qt@aplex:~/ti-processor-sdk-linux-am335x-evm-01.00.00.00$ cat .tftproot 
#     /tftpboot
# 2. 由上面可知，确实生成了.tftproot文件，里面确实也是/tftpboot
echo $tftproot > $cwd/../.tftproot
echo "--------------------------------------------------------------------------------"

echo
echo "--------------------------------------------------------------------------------"
echo "This step will set up the tftp server in the $tftproot directory."
echo
# 接下来需要设定tftp服务器，需要root权限。
echo "Note! This command requires you to have administrator priviliges (sudo access) "
echo "on your host."
read -p "Press return to continue" REPLY

# 查看目录是否存在，如果存在，那么不用创建，如果不存在，那么就创建。
if [ -d $tftproot ]; then
    echo
    echo "$tftproot already exists, not creating.."
else
    sudo mkdir -p $tftproot
    check_status
    sudo chmod 777 $tftproot
    check_status
    sudo chown nobody $tftproot
    check_status
fi

#
# #platform
# PLATFORM=am335x-evm
# #defconfig
# DEFCONFIG=singlecore-omap2plus_defconfig
# #Architecture
# ARCH=armv7-a
# #u-boot machine
# UBOOT_MACHINE=am335x_evm_config
# #Points to the root of the TI SDK
# export TI_SDK_PATH=/home/Qt/ti-processor-sdk-linux-am335x-evm-01.00.00.00
# #root of the target file system for installing applications
# DESTDIR=/home/Qt/ti-processor-sdk-linux-am335x-evm-01.00.00.00/targetNFS
# #Points to the root of the Linux libraries and headers matching the
# #demo file system.
# export LINUX_DEVKIT_PATH=$(TI_SDK_PATH)/linux-devkit
# #Cross compiler prefix
# export CROSS_COMPILE=$(LINUX_DEVKIT_PATH)/sysroots/i686-arago-linux/usr/bin/arm-linux-gnueabihf-
# #Default CC value to be used when cross compiling.  This is so that the
# #GNU Make default of "cc" is not used to point to the host compiler
# export CC=$(CROSS_COMPILE)gcc
# #Location of environment-setup file
# export ENV_SETUP=$(LINUX_DEVKIT_PATH)/environment-setup
# #The directory that points to the SDK kernel source tree
# LINUXKERNEL_INSTALL_DIR=$(TI_SDK_PATH)/board-support/linux-3.14.26-g2489c02
# CFLAGS= -march=armv7-a -marm -mthumb-interwork -mfloat-abi=hard -mfpu=neon -mtune=cortex-a8
# SDK_PATH_TARGET=$(TI_SDK_PATH)/linux-devkit/sysroots/cortexa8t2hf-vfp-neon-linux-gnueabi/
# MAKE_JOBS=4
#
platform=`cat $cwd/../Rules.make | grep -e "^PLATFORM=" | cut -d= -f2`
kernelimage="zImage-""$platform"".bin"
# 之前编译好的文件
kernelimagesrc=`ls -1 $cwd/../board-support/prebuilt-images/$kernelimage`
# 如果tftp根目录下存在了对应的内核文件
if [ -f $tftproot/$kernelimage ]; then
    echo
    echo "$tftproot/$kernelimage already exists. The existing installed file can be renamed and saved under the new name."
    # 由用户决定是使用哪种方式，重命名还是重写。
    echo "(r) rename (o) overwrite (s) skip copy "
    read -p "[r] " exists
    case "$exists" in
      s) echo "Skipping copy of $kernelimage, existing version will be used"
         ;;
      o) sudo cp $kernelimagesrc $tftproot
         check_status
         echo
         echo "Successfully overwritten $kernelimage in tftp root directory $tftproot"
         ;;
      *) dte="`date +%m%d%Y`_`date +%H`.`date +%M`"
         echo "New name for existing kernelimage: "
         # 默认用kernelimage名加上日期来代表老版本的文件名
         read -p "[ $kernelimage.$dte ]" newname
         if [ ! -n "$newname" ]; then
             newname="$kernelimage.$dte"
         fi
         sudo mv "$tftproot/$kernelimage" "$tftproot/$newname"
         check_status
         sudo cp $kernelimagesrc $tftproot
         check_status
         echo
         echo "Successfully copied $kernelimage to tftp root directory $tftproot as $newname"
         ;;
    esac
else
    # 当然如果文件本身就不存在，那么直接cp就行了。
    sudo cp $kernelimagesrc $tftproot
    check_status
    echo
    echo "Successfully copied $kernelimage to tftp root directory $tftproot"
fi

dtbfiles=`cd $cwd/../board-support/prebuilt-images/;ls -1 *.dtb`
prebuiltimagesdir=`cd $cwd/../board-support/prebuilt-images/ ; echo $PWD`

# 这里跟前面的kernel操作差不多。
for dtbfile in $dtbfiles
do
    if [ -f $tftproot/$dtbfile ]; then
        echo
        echo "$tftproot/$dtbfile already exists. The existing installed file can be renamed and saved under the new name."
        echo "(o) overwrite (s) skip copy "
        read -p "[o] " exists
        case "$exists" in
          s) echo "Skipping copy of $dtbfile, existing version will be used"
             ;;
          *) sudo cp "$prebuiltimagesdir/$dtbfile" $tftproot
             check_status
             echo
             echo "Successfully overwritten $$dtbfile in tftp root directory $tftproot"
             ;;
        esac
    else
        sudo cp "$prebuiltimagesdir/$dtbfile" $tftproot
        check_status
        echo
        echo "Successfully copied $dtbfile to tftp root directory $tftproot"
    fi
done

echo
# 如果tftpcfg文件已经存在，需要查看tftp配置中的tftp根目录是否在我们需要的位置，
# 如果不在，那么还是需要另外配置。
if [ -f $tftpcfg ]; then
    echo "$tftpcfg already exists.."

    #Use = instead of == for POSIX and dash shell compliance
    if [ "`cat $tftpcfg | grep server_args | cut -d= -f2 | sed 's/^[ ]*//'`" 
          = "$tftproot" ]; then
        echo "$tftproot already exported for TFTP, skipping.."
    else
        echo "Copying old $tftpcfg to $tftpcfg.old"
        sudo cp $tftpcfg $tftpcfg.old
        check_status
        tftp
    fi
else
    # 如果tftpcfg文件不存在，那么就创建tftp配置文件。
    tftp
fi

echo
echo "Restarting tftp server"
sudo /etc/init.d/xinetd stop        # stop tftp服务
check_status
sleep 1
sudo /etc/init.d/xinetd start       # start tftp服务使tftpcfg有效。
check_status
echo "--------------------------------------------------------------------------------"