ti processor sdk linux am335x evm /bin/unshallow-repositories.sh hacking

#!/bin/bash

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

# Authors:
#    Franklin Cooper Jr.
# This distribution contains contributions or derivatives under copyright
# as follows:
#
# Copyright (c) 2015, Texas Instruments Incorporated
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# - Redistributions of source code must retain the above copyright notice,
#   this list of conditions and the following disclaimer.
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#   documentation and/or other materials provided with the distribution.
# - Neither the name of Texas Instruments nor the names of its
#   contributors may be used to endorse or promote products derived
#   from this software without specific prior written permission.
#
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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install_dir="/home/Qt/ti-processor-sdk-linux-am335x-evm-01.00.00.00"

# Find git binary within the host native bin directory
sdk_git_bin="$install_dir/linux-devkit/sysroots/i*/usr/bin/git"
sdk_git_bin=`which $sdk_git_bin`

if [ "$sdk_git_bin" = "" ]
then
    echo
    echo "Couldn‘t find the git command within linux-devkit"
    echo "Unable to automatically unshallow git repository"
    echo "If you have git installed and a version higher than 1.8.0.3 ( git --version)"
    echo "You can manually unshallow the Linux git repository by running the below"
    echo "command within the SDK‘s Linux git repository"
    echo "git fetch --unshallow"
    echo
    exit 1
fi

# 
# Qt@aplex:~/ti-processor-sdk-linux-am335x-evm-01.00.00.00$ find board-support -maxdepth 1 -name "linux*"
# board-support/linux-3.14.26-g2489c02
linux_dir=`find $install_dir/board-support -maxdepth 1 -name "linux*"`
linux=`basename $linux_dir`

# 
if [ -f $linux_dir/.git/shallow ]
then
    echo
    echo "The kernel git repository has been trimmed to reduce the size of the SDK installer"
    echo "in a process called \"shallowing\". This process causes the repository to include"
    echo "only a small fraction of the entire git history. To retrieve the entire git history"
    echo "you must unshallow the repository. This will require internet access and if applicable"
    echo "proper git proxy settings to access the original remote repository. This script will"
    echo "automatically unshallow the Linux repository for you and retrieve its full history."
    echo "Depending on your internet speed this process can take 5+ minutes."
    echo "Would you like to continue (y/n)?"
    echo

    read -p "[ y ] " continueunshallow
    echo

    if [ ! -n "$continueunshallow" ]; then
       continueunshallow="y"
    fi

    if [ "$continueunshallow" != "y" ]; then
        echo "You selected no. Please run script the again when your ready to unshallow the"
        echo "repository."
        exit 0
    fi

    echo "The unshallowing process has begun. For the first couple of minutes you may not see"
    echo "any additional output. This is normal."

    cd $linux_dir
    # 获取内核
    $sdk_git_bin fetch --unshallow

    if [ "$?" = "0" ]
    then
        echo
        echo "The unshallowing process has been completed. The Linux git repository has been"
        echo "fully restored."
    else
        echo
        echo "Error unshallowing git repository. Please check your internet connection and"
        echo "your git proxy settings."
    fi

    echo

    cd -
else
    echo
    echo "Kernel git repository is not shallow."
    echo "The repository has the full commit history and can be treated as a normal"
    echo "git repository."
    echo
fi