FREESCALE-SDK Linux porting a Build environment script host-prepare.sh analysis

Next, use your own extra-curricular rest time to perform Linux porting and analysis based on the PowerPC architecture Freescale-sdk. The main reference is the official document Freescale Linux SDK start_here.html, the first to build the compilation environment script host-prepare.sh analysis. Before porting the system, you need to build a compilation environment, install the necessary packages, and prepare for the post-compilation system. Many people see the script headache, the following is my analysis process, the analysis of bad places can leave a message, discussed together.

I. Build the compilation environment script analysis./scripts/host-prepare.sh

[Email protected]:~/sdk/qoriq-sdk-v1.4-20130625-yocto$./scripts/host-prepare.sh-h
Usage:./scripts/host-prepare.sh [-h] [-f]
-h:display Help
-f:force Install all needed host pkgs, running non-interactively
Analyze./scripts/host-prepare.sh script, enter command./scripts/host-prepare.sh-h, display Help information.
Script_dir= ' Readlink-f $ (dirname $) ' #获取当前脚本所在目录
Usage_message () { #帮助子函数, enter-H or-? When the function is called to run
echo "Usage: $ [h] [-f]
-h:display Help
-f:force Install all needed host pkgs, running non-interactively
"
} #getopts Options Variable
While getopts "FH" Host_prepare_flag #每次执行循环, getopts checks the next command-line argument and determines if it is legitimate. Check whether the parameter starts with a--followed by a letter contained in option
Do #如果是, the matching option letter exists in the specified variable variable, and returns the exit status 0;
Case $host _prepare_flag in #如果-The letters that follow are not included in the options and are deposited in a variable? and returns the exit status 0;
f) force_update= ' true '; #如果命令行中已经没有参数, or the next parameter does not start with--Returns an exit status of not 0.
;;
?) Usage_message;exit 1;
;;
Esac
Done
# Check Host distribution #检查客服机系统类型, there are/etc/lsb-release files, open the show Distrib_id=ubuntu distrib_release=10.04
If [-r/etc/lsb-release] && grep ubuntu/etc/lsb-release >/dev/null 2>&1#1表示stdout标准输出, the system default value is 1,>/dev/null equivalent to 1>/dev/null
Then #2表示stderr标准错误
# ubuntu-based System
. /etc/lsb-release
distro= "Ubuntu"
Release=${distrib_release}
Hostpkg= "Apt-get"
elif [-r/etc/debian_version]
Then
# debian-based
distro= "Debian"
Release= ' Cat/etc/debian_version '
Hostpkg= "Apt-get"
......
echo "Verifying sudo permission to execute $hostpkg command."#输出Verifying sudo permission to execute apt-get command.
User= ' WhoAmI ' | | True #这里包括下面几句都是关于root权限判断的, analyze??? later
......
Case ' $distro ' in #根据上面系统判断得出 $distro = "Ubuntu", so execute the script script= "$SCRIPT _dir/host-prepare-ubuntu-mint-debian.sh";
' Ubuntu ' | ' Mint ' | ' Debian ')
script= "$SCRIPT _dir/host-prepare-ubuntu-mint-debian.sh";
;;
' Redhat ' | ' CentOS ' | ' Fedora ')
script= "$SCRIPT _dir/host-prepare-rhel-centos-fedora.sh";
;;
' SUSE ' | ' OpenSUSE ')
script= "$SCRIPT _dir/host-prepare-suse.sh";
;;
Esac
#紧接着上面分析 $SCRIPT _dir/host-prepare-ubuntu-mint-debian.sh, of which $script_dir=~/sdk/qoriq-sdk-v1.4-20130625-yocto/ Scripts
if test $force _update; Then update_flag= '-y--force-yes '; fi#force_update = ' true ' Assignment update_flag= '-y--force-yes '
pkgs= "sed wget subversion git-core coreutils \
Unzip texi2html texinfo libsdl1.2-dev docbook-utils fop gawk \
Python-pysqlite2 diffstat make gcc build-essential xsltproc \
g++ desktop-file-utils chrpath Libgl1-mesa-dev libglu1-mesa-dev \
autoconf automake groff libtool xterm libxml-parser-perl \
"
# pkgs required for FSL use
pkgs= "$PKGS vim-common xz-utils CVS Tofrodos libstring-crc32-perl"
pkgs= "$PKGS Patch Libbonobo2-common Libncurses5-dev"
If ["' uname-m '" = "x86_64"]; Then
pkgs= "$PKGS ia32-libs Lib32ncurses5-dev"
Fi #对PKGS赋值需要安装的包
echo "Now we" re going to install all the other development packages needed to build Yocto, please wait "
sudo apt-get $UPDATE _flag install $PKGS #搭建编译环境, install the necessary packages
At this point, the necessary packages have been installed to build a good environment for the post-system normal compilation.

FREESCALE-SDK Linux porting a Build environment script host-prepare.sh analysis