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

#!/bin/sh

#
#   ti processor sdk linux am335x evm /bin/setup-targetfs-nfs.sh hacking
# 说明：
#     本文主要对TI的sdk中的setup-targetfs-nfs.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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# modification, are permitted provided that the following conditions
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#   from this software without specific prior written permission.
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cwd=`dirname $0`
. $cwd/common.sh

#
# #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

# TI_SDK_PATH=/home/Qt/ti-processor-sdk-linux-am335x-evm-01.00.00.00
SDKinstall=`grep TI_SDK_PATH= $cwd/../Rules.make | cut -d= -f2`
# dstdefault=/home/Qt/ti-processor-sdk-linux-am335x-evm-01.00.00.00/targetNFS
dstdefault=$SDKinstall/targetNFS


echo "--------------------------------------------------------------------------------"
# 配置NFS目录
echo "In which directory do you want to install the target filesystem?(if this directory does not exist it will be created)"
read -p "[ $dstdefault ] " dst

if [ ! -n "$dst" ]; then
    dst=$dstdefault
fi
echo "--------------------------------------------------------------------------------"

echo
echo "--------------------------------------------------------------------------------"
echo "This step will extract the target filesystem to $dst"
echo
# 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

extract_fs() {
    # 文件系统的tar包位置
    fstar=`ls -1 $cwd/../filesystem/??sdk*rootfs*.tar.gz`
    me=`whoami`                     # 获取用户名
    sudo mkdir -p $1                # 创建指定目录
    check_status
    sudo tar xzf $fstar -C $1       # 将文件系统解压到指定的目录
    check_status
    sudo chown $me:$me $1           # 改变指定目录的用户和群组
    check_status
    sudo chown -R $me:$me $1/home $1/usr $1/etc $1/lib $1/boot  # 改变指定目录下的属性
    check_status

    # Opt isn't a standard Linux directory. First make sure it exist.
    if [ -d $1/opt ];
    then
            sudo chown -R $me:$me $1/opt
            check_status
    fi

    echo
    # 显示提取文件成功
    echo "Successfully extracted `basename $fstar` to $1"
}

# 检查目录是否存在，根据是否存在做对应的事：备份、拷贝等。
if [ -d $dst ]; then
    echo "$dst already exists"
    echo "(r) rename existing filesystem (o) overwrite existing filesystem (s) skip filesystem extraction"
    read -p "[r] " exists
    case "$exists" in
      s) echo "Skipping filesystem extraction"
         echo "WARNING! Keeping the previous filesystem may cause compatibility problems if you are upgrading the SDK"
         ;;
      o) sudo rm -rf $dst
         echo "Old $dst removed"
         extract_fs $dst
         ;;
      *) dte="`date +%m%d%Y`_`date +%H`.`date +%M`"
         echo "Path for old filesystem:"
         read -p "[ $dst.$dte ]" old
         if [ ! -n "$old" ]; then
             old="$dst.$dte"
         fi
         sudo mv $dst $old
         check_status
         echo
         echo "Successfully moved old $dst to $old"
         extract_fs $dst
         ;;
    esac
else
    extract_fs $dst
fi
# 1. 查看
#     Qt@aplex:~/ti-processor-sdk-linux-am335x-evm-01.00.00.00$ ls -al
#     total 294792
#     -rwxr-xr-x  1 Qt   Qt        1260 Aug 14  2015 Rules.make
#     -rwxr-xr-x  1 Qt   Qt        4188 Apr 11  2015 setup.sh
#     -rw-rw-r--  1 Qt   Qt          77 Aug 14  2015 .gdbinit
#     -rw-rw-r--  1 Qt   Qt          65 Aug 14  2015 .targetfs
#     drwxr-xr-x 19 root root      4096 Aug 14  2015 targetNFS
#     Qt@aplex:~/ti-processor-sdk-linux-am335x-evm-01.00.00.00$ cat .targetfs 
#     /home/Qt/ti-processor-sdk-linux-am335x-evm-01.00.00.00/targetNFS
#     Qt@aplex:~/ti-processor-sdk-linux-am335x-evm-01.00.00.00$ 
#     Qt@aplex:~/ti-processor-sdk-linux-am335x-evm-01.00.00.00$ cat .gdbinit 
#     set sysroot /home/Qt/ti-processor-sdk-linux-am335x-evm-01.00.00.00/targetNFS
# 2. 如上可知，.targetfs确实生成了。
echo $dst > $cwd/../.targetfs
echo "set sysroot $dst" > $cwd/../.gdbinit
echo "--------------------------------------------------------------------------------"

# platform=am335x-evm
platform=`grep PLATFORM= $cwd/../Rules.make | cut -d= -f2`
echo
echo "--------------------------------------------------------------------------------"
echo "This step will set up the SDK to install binaries in to:"
echo "    $dst/home/root/$platform"
echo
echo "The files will be available from /home/root/$platform on the target."
echo
echo "This setting can be changed later by editing Rules.make and changing the"
echo "EXEC_DIR or DESTDIR variable (depending on your SDK)."
echo
read -p "Press return to continue" REPLY

sed -i "s=EXEC_DIR\=.*$=EXEC_DIR\=$dst/home/root/$platform=g" $cwd/../Rules.make
check_status

#  DESTDIR=/home/Qt/ti-processor-sdk-linux-am335x-evm-01.00.00.00/targetNFS
sed -i "s=DESTDIR\=.*$=DESTDIR\=$dst=g" $cwd/../Rules.make
check_status

echo "Rules.make edited successfully.."
echo "--------------------------------------------------------------------------------"

echo
echo "--------------------------------------------------------------------------------"
echo "This step will export your target filesystem for NFS access."
echo
echo "Note! This command requires you to have administrator priviliges (sudo access) "
echo "on your host."
read -p "Press return to continue" REPLY

# 检查NFS的路径是否已经设置了，如果设置了，那么就调过，如果没有设置，那么重新设置。
grep $dst /etc/exports > /dev/null
if [ "$?" -eq "0" ]; then
    echo "$dst already NFS exported, skipping.."
else
    sudo chmod 666 /etc/exports
    check_status
    sudo echo "$dst *(rw,nohide,insecure,no_subtree_check,async,no_root_squash)" >> /etc/exports
    check_status
    sudo chmod 644 /etc/exports
    check_status
fi

echo
sudo /etc/init.d/nfs-kernel-server stop     # 关闭nfs服务器
check_status
sleep 1
sudo /etc/init.d/nfs-kernel-server start    # 打开nfs服务为，是配置有效
check_status
echo "--------------------------------------------------------------------------------"