通过两个manifest文件比较两个版本之间差异

#!/bin/sh
current=$(pwd)
echo -n "Please input first manifest:"
read ManifestOld
echo -n "Please input second manifest:"
read ManifestNew
export log=$(echo "${current}/diff_two_manifest.txt")
 
cat $current/$ManifestOld |grep "project name=" |while read line
do
    eachline=$(echo $line)
    projecttmp=${
    
    eachline#*\"}
    project=${
    
    projecttmp%%\"*}
    revisionoldtmp=${eachline#*revision=\"}
    revisionold=${
    
    revisionoldtmp%%\"*}
    pathtmp=${eachline#*path=\"}
    path=${
    
    pathtmp%%\"*}
    revisionnewline=$(cat $current/$ManifestNew |grep $project)
    revisionnewtmp=${revisionnewline#*revision=\"}
    revisionnew=${
    
    revisionnewtmp%%\"*}
    if [ $revisionold != $revisionnew ];then
        cd $current/$path
        echo ------------------------------------------------------------ |tee -a $log
        echo "project "$path: |tee -a $log
        git log --pretty=oneline $revisionold..$revisionnew |tee -a $log
        echo ------------------------------------------------------------ |tee -a $log
        cd $current
    fi
done