问题的提出
公司各个业务线的安装包小则几十兆、大则几百兆，使用自建的升级系统向全国百万级用户下发新版本时，流量耗费相当惊人。有时新版本仅仅改了几个 dll ，总变更量不过几十 K 而已，也要发布一个完整版本。为了降低流量费用，我们推出了补丁升级的方式：产品组将修改的 dll 单独挑选出来，加上一个配置文件压缩成包，上传到自建的升级后台；在客户端，识别到补丁包类型后，手动解压并替换各个 dll 完成安装（之前是直接启动下载好的安装包）。这种方式一经推出，受到了业务线的追捧。然而在使用过程中，也发现一些问题，就是在修改完一个源文件后，受影响的往往不止一个 dll，如果仅把其中一两个 dll 替换了，没替换的 dll 很可能就会和新的 dll 产生接口不兼容，从而引发崩溃。而有的安装包包含了几十个、上百个 dll，如果一一对比，非常费时费力。特别是一些 dll 仅仅是编译时间不一样，通过普通的文件对比工具，根本无法判断这个 dll 的源码有没有改过，这让开发人员非常头大。
问题的解决
其实这个问题用 c++ 写个程序是可以解决的，但是一想到要遍历目录、构造文件名 map、对比两个目录中的文件名、对比相同文件名的内容、复制文件到目标目录、压缩目标目录…这一系列操作时，我觉得还是算了 —— 都得从头开始写，工作量不小。而 msys2 或 windows 中就有不少现成的命令可以用，例如对比目录可以用 diff -r 命令、对比 win32 可执行文件可以用 dumpbin /disasm 命令反编译然后再用 diff 命令对比、压缩文件夹可以使用 7z 命令等等，完全不用重复造轮子，直接用 shell 将它们粘合起来就完事了！下面就来看看我是怎么用 shell 脚本来写这个小工具吧。
处理命令行参数
这个脚本一开始先处理输入的命令行参数：
1 # return code:
2 # 0 : success
3 # 1 : no difference
4 # 2 : compress failure
5 # 3 : create file/dir failure (privilege ?)
6 # 126 : file/dir existent
7 # 127 : invalid arguments
8
9 function usage ()
10 {
11 echo "Usage: diffpacker.sh -o oldversionfolder -n newversionfolder -r relativepath -x exportfolder -v version [-s sp] [-t (verbose)] [-e (exactmode)]"
12
13 exit 127
14 }
15
16 srcdir=
17 dstdir=
18 reldir=
19 outdir=
20 version=
21 sp=0
22 verbose=0
23 exactmode=0
24 setupdir="setup"
25 # pure windows utilities subdir
26 win32="win32"
27
28 if [ "${$*/-t//}" != "$*" ]; then
29 # dump parameters when verbose on
30 echo "total $# param(s):"
31 for var in $*; do
32 echo "$var"
33 done
34 fi
35
36
37 while getopts "o:n:r:x:v:s:te" arg
38 do
39 case $arg in
40 o)
41 srcdir=$OPTARG
42 ;;
43 n)
44 dstdir=$OPTARG
45 ;;
46 r)
47 reldir=$OPTARG
48 ;;
49 x)
50 outdir=$OPTARG
51 ;;
52 v)
53 version=$OPTARG
54 ;;
55 s)
56 sp=$OPTARG
57 ;;
58 t)
59 verbose=1
60 ;;
61 e)
62 exactmode=1
63 ;;
64 ?)
65 echo "unkonw argument: $arg"
66 usage
67 exit 127
68 ;;
69 esac
70 done
71
72 # reldir can be empty
73 if [ -z "$srcdir" -o -z "$dstdir" -o -z "$outdir" -o -z "$version" ]; then
74 echo "empty parameter found: $srcdir, $dstdir, $outdir, $version"
75 usage
76 exit 127
77 fi
78
79 #replace all \ to / to avoid shell string choked on \
80 srcdir=${srcdir//\\/\/}
81 dstdir=${dstdir//\\/\/}
82 reldir=${reldir//\\/\/}
83 outdir=${outdir//\\/\/}
84
85 echo "srcdir=$srcdir"
86 echo "dstdir=$dstdir"
87 echo "reldir=$reldir"
88 echo "outdir=$outdir"
89 echo "version=$version"
90 echo "sp=$sp"
91 echo "verbose=$verbose"
92 echo "exactmode=$exactmode"
93 echo ""
94
95 if [ ! -d "$srcdir" ]; then
96 echo "not a directory : $srcdir"
97 exit 126
98 fi
99
100 if [ ! -d "$dstdir" ]; then
101 echo "not a directory : $dstdir"
102 exit 126
103 fi
104
105 #if [ -e "$outdir" ]; then
106 resp=$(ls -A "$outdir")
107 if [ "$resp" != "" ]; then
108 echo "out directory not empty: $outdir, fatal error!"
109 exit 126
110 fi
111
112 if [ "${outdir:$((${#outdir}-1))}" == "/" ]; then
113 # remove tailing /
114 outdir=${outdir%?}
115 fi
116
117 if [ ! -z "$reldir" ] && [ "${reldir:$((${#reldir}-1))}" == "/" ]; then
118 # remove tailing /
119 reldir=${reldir%?}
120 fi
121
122 srcasm="src.asm"
123 dstasm="dst.asm"
124 dirdiff="dir.diff"
125 patdiff="diffpattern.txt"
126 itemcnt=0
127 jsonhead=\
128 "{\n"\
129 " \"version\": \"$version\",\n"\
130 " \"sp\": \"$sp\",\n"\
131 " \"actions\": \n"\
132 " [\n"
133
134 json=
135 jsontail=\
136 "\n ]\n"\
137 "}\n"
138
139 echo "exclude patterns: "
140 while read line
141 do
142 echo $line
143 done < "$patdiff"
144
145 # to avoid user not end file with \n
146 if [ ! -z "$line" ]; then
147 echo "$line"
148 fi
149 echo ""
简单解说一下：
- 16-26：声明用到的变量；
- 28-34：如果命令行中含有 -t (verbose) 选项，则打印命令行各个参数；
- 37-70：使用 getopts 命令解析命令行，这个脚本接收以下选项：
- -o (old) 用于对比的旧目录；
- -n (new) 用于对比的新目录；
- -r (relative) 补丁包根目录相对于安装目录的位置，有时可能只针对安装目录的某个子目录进行 patch；
- -x (output) 输出补丁包的目录；
- -v (version) 补丁包版本号，写入配置文件用；
- -s (serial pack) 补丁号，写入配置文件用；
- -t (verbose) 详细输出；
- -e （exact mode) 配置文件中增加和替换文件项将按每项对应一段 json 的方式精确设置，否则按整个目录递归覆盖设置。
- 72-77：空路径校验；
- 79-83：替换路径中的反斜杠为斜杠，因 shell 会将反斜杠识别为转义字符的开始；
- 85-93：打印识别后的各选项，方便出问题时排错；
- 95-120：路径校验，包括：
- 对比目录不得为普通文件；
- 输出目录不得含有文件（防止将中间对比结果和上一次或其它对比结果放在一起打包）；
- 剔除输出目录与相对目录的结尾斜杠（方便后续处理）。
- 122-137：中间变量的定义，包含反编译中间文件、目录对比中间文件、忽略文件模式的中间文件以及生成配置文件的 json 头和尾；
- 139-149：在对比目录时，用户可以提供一个要忽略的文件模式（pattern）列表，例如不对比 [Dd]ebug、[Ss]ymbol、*.pdb 这些编译中间目录或文件，可以使用正则表达式，每行一个。这里打印这些 pattern 用于排错。
对比目录
经过前期的铺垫，进入第一个重头戏：
1 if [ -f "$patdiff" ]; then
2 diff -qr "$srcdir" "$dstdir" -X "$patdiff" > "$dirdiff"
3 else
4 diff -qr "$srcdir" "$dstdir" > "$dirdiff"
5 fi
6
7 while read line
8 do
9 if [ $verbose != 0 ]; then
10 echo $line
11 fi
12
13 tmp=$(echo $line | sed -n 's/Files \(.*\) and \(.*\) differ$/\1\\n\2/p')
14 if [ ! -z "$tmp" ]; then
15 left=$(echo -e $tmp | sed -n 1p)
16 right=$(echo -e $tmp | sed -n 2p)
17 if [ $verbose != 0 ]; then
18 echo -e "left =$left, \nright=$right"
19 fi
20 ......
21 else
22 tmp=$(echo $line | sed -n 's/Only in \(.*\): \(.*\)/\1\\n\2/p')
23 if [ ! -z "$tmp" ]; then
24 isdir=0
25 dir=$(echo -e $tmp | sed -n 1p)
26 file=$(echo -e $tmp | sed -n 2p)
27 if [ -d "$dir/$file" ]; then
28 isdir=1
29 fi
30
31 if [ $verbose != 0 ]; then
32 echo "dir=$dir, file=$file, isdir=$isdir"
33 fi
34 ......
35 else
36 echo "unrecognized diff output: $line"
37 fi
38 fi
39 echo ""
40 done < "$dirdiff"
这段代码省略了一些与对比目录无关的内容，便于看清整个大的流程：
- 1-5：根据是否有忽略模式文件来调用 diff，当存在这种文件时（上文中的 139-149），增加 -X 选项来添加忽略模式文件到对比目录过程(diff)；否则使用简单输出模式(-q)递归(-r)对比目录及其子目录，输出内容保存在 dir.diff 文件中；
- 7,8,40：遍历 dir.diff 文件内容，根据输出格式的不同，细分为以下几类场景：
- 两侧都有但文件内容不一致：”Files C:/compare/BIMMAKE.old/BmIGMS/TypeRule4Bimface.json and C:/compare/BIMMAKE/BmIGMS/TypeRule4Bimface.json differ”，通过 sed 匹配例子中高亮部分关键字，就可以分别提取出旧文件与新文件的完整路径（分别为 sed 输出的第一二行，line 13-16）；
- 仅有旧目录有的内容：”Only in C:/compare/BIMMAKE.old/sdk : ViewerConfig.ini”；
- 仅有新目录有的内容：”Only in C:/compare/BIMMAKE/sdk : Mesh.dll”， 以上两种场景相似，通过 sed 匹配例子中高亮部分关键字，就可以分别提取出目录与文件了（line 22-26），至于是新目录还是旧目录，与新旧根目录做个对比就晓得了，这个后面再说；
- 两边文件一致：不会有任何输出（这里必需为 diff 命令使用 -q 选项，不然会将文件内容差异也展示出来，那就非常乱了）。下面是一段完整的对比输出（内容超长、展开慎重）：
bash;gutter:false;collapse:true
Files C: /compare/BIMMAKE .old /AppBimmake .exe and C: /compare/BIMMAKE/AppBimmake .exe differ
Files C: /compare/BIMMAKE .old /AppBimmakeImpl .dll and C: /compare/BIMMAKE/AppBimmakeImpl .dll differ
Files C: /compare/BIMMAKE .old /AppComponentEditor .exe and C: /compare/BIMMAKE/AppComponentEditor .exe differ
Files C: /compare/BIMMAKE .old /AppComponentEditorImpl .dll and C: /compare/BIMMAKE/AppComponentEditorImpl .dll differ
Only in C: /compare/BIMMAKE : AppSocketPortConfig.exe
Only in C: /compare/BIMMAKE : AppSocketPortConfigImpl.dll
Files C: /compare/BIMMAKE .old /BIMMAKE/Templates/bmDefaultTemplate .gbp and C: /compare/BIMMAKE/BIMMAKE/Templates/bmDefaultTemplate .gbp differ
Files C: /compare/BIMMAKE .old /BmAnimation .dll and C: /compare/BIMMAKE/BmAnimation .dll differ
Files C: /compare/BIMMAKE .old /BmAnimationScript .dll and C: /compare/BIMMAKE/BmAnimationScript .dll differ
Only in C: /compare/BIMMAKE : BmAppSetting.xml
Files C: /compare/BIMMAKE .old /BmCommonDraw .dll and C: /compare/BIMMAKE/BmCommonDraw .dll differ
Files C: /compare/BIMMAKE .old /BmCommonEdit .dll and C: /compare/BIMMAKE/BmCommonEdit .dll differ
Files C: /compare/BIMMAKE .old /BmDataExchange .dll and C: /compare/BIMMAKE/BmDataExchange .dll differ
Files C: /compare/BIMMAKE .old /BmDrawingExport .dll and C: /compare/BIMMAKE/BmDrawingExport .dll differ
Files C: /compare/BIMMAKE .old /BmFalcon .dll and C: /compare/BIMMAKE/BmFalcon .dll differ
Files C: /compare/BIMMAKE .old /BmFamilyBridge .dll and C: /compare/BIMMAKE/BmFamilyBridge .dll differ
Files C: /compare/BIMMAKE .old /BmGbmpModel .dll and C: /compare/BIMMAKE/BmGbmpModel .dll differ
Files C: /compare/BIMMAKE .old /BmGbmpUiPlatform .dll and C: /compare/BIMMAKE/BmGbmpUiPlatform .dll differ
Files C: /compare/BIMMAKE .old /BmGgpUtility .dll and C: /compare/BIMMAKE/BmGgpUtility .dll differ
Files C: /compare/BIMMAKE .old /BmGuxActionConfig .json and C: /compare/BIMMAKE/BmGuxActionConfig .json differ
Files C: /compare/BIMMAKE .old /BmHotKeyConfig .xml and C: /compare/BIMMAKE/BmHotKeyConfig .xml differ
Files C: /compare/BIMMAKE .old /BmIGMS/TypeRule .json and C: /compare/BIMMAKE/BmIGMS/TypeRule .json differ
Files C: /compare/BIMMAKE .old /BmIGMS/TypeRule4Bimface .json and C: /compare/BIMMAKE/BmIGMS/TypeRule4Bimface .json differ
Files C: /compare/BIMMAKE .old /BmIGMSExport .dll and C: /compare/BIMMAKE/BmIGMSExport .dll differ
Files C: /compare/BIMMAKE .old /BmImportGfc .dll and C: /compare/BIMMAKE/BmImportGfc .dll differ
Files C: /compare/BIMMAKE .old /BmImportIfc .dll and C: /compare/BIMMAKE/BmImportIfc .dll differ
Files C: /compare/BIMMAKE .old /BmInterOpRevitProject .dll and C: /compare/BIMMAKE/BmInterOpRevitProject .dll differ
Files C: /compare/BIMMAKE .old /BmInteraction .dll and C: /compare/BIMMAKE/BmInteraction .dll differ
Files C: /compare/BIMMAKE .old /BmLicense .dll and C: /compare/BIMMAKE/BmLicense .dll differ
Files C: /compare/BIMMAKE .old /BmModel .dll and C: /compare/BIMMAKE/BmModel .dll differ
Files C: /compare/BIMMAKE .old /BmMultiThreadNetwork .dll and C: /compare/BIMMAKE/BmMultiThreadNetwork .dll differ
Files C: /compare/BIMMAKE .old /BmPositioningElements .dll and C: /compare/BIMMAKE/BmPositioningElements .dll differ
Files C: /compare/BIMMAKE .old /BmRebar .dll and C: /compare/BIMMAKE/BmRebar .dll differ
Only in C: /compare/BIMMAKE .old: BmRecentDocumentPathRecord.xml
Files C: /compare/BIMMAKE .old /BmSiteLayout .dll and C: /compare/BIMMAKE/BmSiteLayout .dll differ
Files C: /compare/BIMMAKE .old /BmSiteLayoutFamily .dll and C: /compare/BIMMAKE/BmSiteLayoutFamily .dll differ
Files C: /compare/BIMMAKE .old /BmSiteLayoutUi .dll and C: /compare/BIMMAKE/BmSiteLayoutUi .dll differ
Files C: /compare/BIMMAKE .old /BmStructure .dll and C: /compare/BIMMAKE/BmStructure .dll differ
Files C: /compare/BIMMAKE .old /BmStructureFamily .dll and C: /compare/BIMMAKE/BmStructureFamily .dll differ
Files C: /compare/BIMMAKE .old /BmSurfaceSystem .dll and C: /compare/BIMMAKE/BmSurfaceSystem .dll differ
Files C: /compare/BIMMAKE .old /BmTeighaUtility .dll and C: /compare/BIMMAKE/BmTeighaUtility .dll differ
Files C: /compare/BIMMAKE .old /BmTest .dll and C: /compare/BIMMAKE/BmTest .dll differ
Files C: /compare/BIMMAKE .old /BmThirdPartyUpdate .dll and C: /compare/BIMMAKE/BmThirdPartyUpdate .dll differ
Files C: /compare/BIMMAKE .old /BmUiAnimation .dll and C: /compare/BIMMAKE/BmUiAnimation .dll differ
Files C: /compare/BIMMAKE .old /BmUiAnimationWidget .dll and C: /compare/BIMMAKE/BmUiAnimationWidget .dll differ
Files C: /compare/BIMMAKE .old /BmUiCommonComponent .dll and C: /compare/BIMMAKE/BmUiCommonComponent .dll differ
Files C: /compare/BIMMAKE .old /BmUiDataExchange .dll and C: /compare/BIMMAKE/BmUiDataExchange .dll differ
Files C: /compare/BIMMAKE .old /BmUiInplaceEdit .dll and C: /compare/BIMMAKE/BmUiInplaceEdit .dll differ
Files C: /compare/BIMMAKE .old /BmUiPlatform .dll and C: /compare/BIMMAKE/BmUiPlatform .dll differ
Files C: /compare/BIMMAKE .old /BmUiReBar .dll and C: /compare/BIMMAKE/BmUiReBar .dll differ
Files C: /compare/BIMMAKE .old /BmUiStructure .dll and C: /compare/BIMMAKE/BmUiStructure .dll differ
Files C: /compare/BIMMAKE .old /BmUiVisual .dll and C: /compare/BIMMAKE/BmUiVisual .dll differ
Files C: /compare/BIMMAKE .old /BmVisualModel .dll and C: /compare/BIMMAKE/BmVisualModel .dll differ
Files C: /compare/BIMMAKE .old /BmWelcomeTemplateFile/MjTemplateFile .xml and C: /compare/BIMMAKE/BmWelcomeTemplateFile/MjTemplateFile .xml differ
Files C: /compare/BIMMAKE .old /BmWelcomeTemplateFile/ 二次结构砌体.gbp and C: /compare/BIMMAKE/BmWelcomeTemplateFile/ 二次结构砌体.gbp differ
Files C: /compare/BIMMAKE .old /BmWelcomeTemplateFile/ 二次结构砌体.png and C: /compare/BIMMAKE/BmWelcomeTemplateFile/ 二次结构砌体.png differ
Only in C: /compare/BIMMAKE .old /BmWelcomeTemplateFile : 小别墅.gbp
Only in C: /compare/BIMMAKE .old /BmWelcomeTemplateFile : 小别墅.png
Files C: /compare/BIMMAKE .old /BmWelcomeTemplateFile/ 施工场地布置.gbp and C: /compare/BIMMAKE/BmWelcomeTemplateFile/ 施工场地布置.gbp differ
Files C: /compare/BIMMAKE .old /BmWelcomeTemplateFile/ 施工场地布置.png and C: /compare/BIMMAKE/BmWelcomeTemplateFile/ 施工场地布置.png differ
Only in C: /compare/BIMMAKE/BmWelcomeTemplateFile : 木模板配模.gbp
Only in C: /compare/BIMMAKE/BmWelcomeTemplateFile : 木模板配模.png
Only in C: /compare/BIMMAKE .old /BmWelcomeTemplateFile : 老虎窗屋顶.gbp
Only in C: /compare/BIMMAKE .old /BmWelcomeTemplateFile : 老虎窗屋顶.png
Only in C: /compare/BIMMAKE/BmWelcomeTemplateFile : 钢筋节点深化.gbp
Only in C: /compare/BIMMAKE/BmWelcomeTemplateFile : 钢筋节点深化.png
Files C: /compare/BIMMAKE .old /CadIdentifier/ArchiAlgo .dll and C: /compare/BIMMAKE/CadIdentifier/ArchiAlgo .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/BarInfo .GDB and C: /compare/BIMMAKE/CadIdentifier/BarInfo .GDB differ
Files C: /compare/BIMMAKE .old /CadIdentifier/BarInfo .GDB.back and C: /compare/BIMMAKE/CadIdentifier/BarInfo .GDB.back differ
Files C: /compare/BIMMAKE .old /CadIdentifier/CadIdentifier2018 .exe and C: /compare/BIMMAKE/CadIdentifier/CadIdentifier2018 .exe differ
Files C: /compare/BIMMAKE .old /CadIdentifier/CmdCore .dll and C: /compare/BIMMAKE/CadIdentifier/CmdCore .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/Common .dll and C: /compare/BIMMAKE/CadIdentifier/Common .dll differ
Only in C: /compare/BIMMAKE .old /CadIdentifier : DBErrorReport.txt
Files C: /compare/BIMMAKE .old /CadIdentifier/DBOperations .dll and C: /compare/BIMMAKE/CadIdentifier/DBOperations .dll differ
Only in C: /compare/BIMMAKE/CadIdentifier : Fonts
Files C: /compare/BIMMAKE .old /CadIdentifier/GCADIdentification .dll and C: /compare/BIMMAKE/CadIdentifier/GCADIdentification .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GCADModel .dll and C: /compare/BIMMAKE/CadIdentifier/GCADModel .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GCLDataService .dll and C: /compare/BIMMAKE/CadIdentifier/GCLDataService .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GCLProjectDataHelper .dll and C: /compare/BIMMAKE/CadIdentifier/GCLProjectDataHelper .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GCPPMProjDataHelper .dll and C: /compare/BIMMAKE/CadIdentifier/GCPPMProjDataHelper .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GEPEngine .dll and C: /compare/BIMMAKE/CadIdentifier/GEPEngine .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GFCCommon .dll and C: /compare/BIMMAKE/CadIdentifier/GFCCommon .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GGDB .dll and C: /compare/BIMMAKE/CadIdentifier/GGDB .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GGDBDataAwareCtrl .dll and C: /compare/BIMMAKE/CadIdentifier/GGDBDataAwareCtrl .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GGJProjectDataHelper .dll and C: /compare/BIMMAKE/CadIdentifier/GGJProjectDataHelper .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GGJSectionBarEditor .dll and C: /compare/BIMMAKE/CadIdentifier/GGJSectionBarEditor .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GGPViewerProxy .dll and C: /compare/BIMMAKE/CadIdentifier/GGPViewerProxy .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GLDCommon .dll and C: /compare/BIMMAKE/CadIdentifier/GLDCommon .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GLDCrypt .dll and C: /compare/BIMMAKE/CadIdentifier/GLDCrypt .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GLDPrivateCalledPlatform .dll and C: /compare/BIMMAKE/CadIdentifier/GLDPrivateCalledPlatform .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GLDStyles .dll and C: /compare/BIMMAKE/CadIdentifier/GLDStyles .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GLDTableView .dll and C: /compare/BIMMAKE/CadIdentifier/GLDTableView .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GLDThemeEngine .dll and C: /compare/BIMMAKE/CadIdentifier/GLDThemeEngine .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GLDWidget .dll and C: /compare/BIMMAKE/CadIdentifier/GLDWidget .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GLDXML .dll and C: /compare/BIMMAKE/CadIdentifier/GLDXML .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GLDZip .dll and C: /compare/BIMMAKE/CadIdentifier/GLDZip .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GMCommon .dll and C: /compare/BIMMAKE/CadIdentifier/GMCommon .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GMJ .dll and C: /compare/BIMMAKE/CadIdentifier/GMJ .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GMModel .dll and C: /compare/BIMMAKE/CadIdentifier/GMModel .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GMPControls .dll and C: /compare/BIMMAKE/CadIdentifier/GMPControls .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GMPCore .dll and C: /compare/BIMMAKE/CadIdentifier/GMPCore .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GMPRibbonStyle .dll and C: /compare/BIMMAKE/CadIdentifier/GMPRibbonStyle .dll differ
Files C: /compare/BIMMAKE .old /CadIdentifier/GMPUIExtends .dll and C: /compare/BIMMAKE/CadIdentifier/GMPUIExtends .dll differ
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<pre><code>
## 文件内容对比
在上面目录对比过程中，如果两边文件都存在而只是内容不同，进入文件内容对比逻辑：
</code></pre>
<p>1 # for windows command, parameter seperator is /
2 # and bash will autoexpand to DRIVE:/
3 # here use // to avoid expanding.</p>
<p>4 $win32/dumpbin //disasm "$left" | sed '5d' > "$srcasm"
5
6 # use sed '5d' to remove a line like :
7 # Dump of file Bin1334\Release\GSUPService.exe
8 # which disturb the diff result by writing dir name
9 # remove it !!</p>
<p>10 $win32/dumpbin //disasm "$right" | sed '5d' > "$dstasm"
11
12 if [ $(cat "$srcasm" | wc -l) -gt 10 ] && [ $(cat "$dstasm" | wc -l) -gt 10 ]; then
13 # left & right are all valid PE format
14 resp=$(diff -q "$srcasm" "$dstasm")
15 if [ $verbose != 0 ]; then
16 echo "resp=$resp"
17 fi
18 else
19 resp="non PE format differs"
20 echo "$resp"
21 fi
22
23 if [ -z "$resp" ]; then
24 echo -e " $left \n== $right in asm, skip"
25 else
26 # need to replace
27 echo -e " $left \n!= $right"
28 relpath=$(get_relative_path "$srcdir" "$left")
29 if [ -z "$relpath" ]; then
30 echo "find relative path by source dir failed, try dest"
31 relpath=$(get_relative_path "$dstdir" "$right")
32 if [ -z "$relpath" ]; then
33 echo "find relative path by dest dir failed, skip"
34 continue;
35 fi
36 fi
37
38 if [ $verbose != 0 ]; then
39 echo "relpath: $relpath"
40 fi
41
42 tarpath="$outdir/$setupdir$relpath"
43 copy_file "$right" "$tarpath"
44 itemcnt=$(($itemcnt+1))
45 if [ $exactmode != 0 ]; then
46 # 1st argument represent zip folder
47 # 2nd argument represent install folder
48 # differs with copy order !
49 replace_item "$setupdir$relpath" "$relpath"
50 fi
51 fi</p>
<pre><code>
这里需要考虑二进制可执行文件不能直接对比（同样的代码编译两次得到的可执行文件也不一样，这是因为 PE 文件中包含了生成时间、唯一 ID 等与代码无关的内容），因此需要将其先反编译为汇编文本，再对汇编语句进行对比。这里没有通过文件后缀(dll / exe)来判断是否为可执行文件，这是因为产品中总有一些 dll 有奇奇怪怪的后缀。这里统一采用 dumpbin 进行反汇编，如果成功就是可执行文件；反之就是普通的文本或二进制文件。
* 1-10：尝试使用 dumpbin 进行反汇编（注意使用 //disasm 来传递 win32 命令选项，因为 msys2 会将单独的 / 认为是根目录从而自动进行扩展、是我们不想要的）。下面是反汇编成功后的输出：
;gutter:true;collapse:false
Microsoft (R) COFF /PE Dumper Version 12.00.40629.0
Copyright (C) Microsoft Corporation. All rights reserved.
File Type: DLL
0000000180001000: 45 8B C0 mov r8d,r8d
……
000000018000E202: CC int 3
Summary
1000 .data
1000 .pdata
7000 .rdata
1000 .reloc
1000 .rsrc
E000 .text
可见 dumpbin 会输出一个占 5 行的头部信息，为了防止这个信息干扰后续的对比，这里使用 sed 删除前 5 行；
- 12-21：如果旧文件与新文件反汇编结果行数都大于10，说明两者都是可执行文件，去除前 5 行后进行反汇编内容的对比；否则是普通文件，不再进行对比（diff 已告诉我们它们不同）。下面是反汇编失败时的输出：
bash;gutter:true;collapse:false
$ win32 /dumpbin //disasm C: /compare/BIMMAKE/FillPatternFileApiTestData/right .pat
Microsoft (R) COFF /PE Dumper Version 12.00.40629.0
Copyright (C) Microsoft Corporation. All rights reserved.</p>
<p>Dump of file C: /compare/BIMMAKE/FillPatternFileApiTestData/right .pat
C: /compare/BIMMAKE/FillPatternFileApiTestData/right .pat : warning LNK4048: Invalid format file ; ignored</p>
<p>Summary</p>
<pre><code>
可以看到一共只有 9 行输出，而一般成功的反汇编输出少则上百行、多则上万行，再少也不可能少于 10 行输出；
* 23-36：如果文件内容一样，跳过此文件；否则需要确定当前文件在对比目录中的相对路径。先尝试使用旧目录去获取，如果失败再尝试使用新目录去获取。这里获取相对目录的工作交由 get_relative_path 这个函数来完成，出于对整体的把握，这里不对这些细节展开介绍了；
* 42-50：通过上面获得的相对路径，就可以在输出目录构建目标文件全路径啦。复制文件的工作交由 copy_file 函数来完成，在内部它先创建对应的目录，然后调用 cp 完成文件复制。如果用户选择了 exact 模式，则将为每项在配置文件中添加一条 json 格式的替换记录 (通过 replace_item 函数)，格式类似于下面这样：
;gutter:true;collapse:false
{
"type" : "replace" ,
"target" : "/Teigha/ACCAMERA_20.8src_14.tx" ,
"source" : "setup/Teigha/ACCAMERA_20.8src_14.tx"
},
对于非 exact 模式可以直接将整个目录递归覆盖到目标区域，因而不需要一条条的添加 json 配置。
单个文件处理
在上面的目录对比过程中，如果两边只有一个文件/目录存在，进入单个文件/目录处理逻辑：
1 relpath=$(get_relative_path "$srcdir" "$dir")
2 if [ ! -z "$relpath" ]; then
3 # need to remove
4 echo -e "only in $srcdir: (old)\n $dir/$file, \nrelpath: $relpath/$file"
5 itemcnt=$(($itemcnt+1))
6 # 1st argument represent install folder
7 # differs with copy order !
8 delete_item "$relpath/$file" $isdir
9 else
10 relpath=$(get_relative_path "$dstdir" "$dir")
11 if [ ! -z "$relpath" ]; then
12 # need to add
13 echo -e "only in $dstdir: (new)\n $dir/$file, \nrelpath: $relpath/$file"
14 copy_file "$dir/$file" "$outdir/$setupdir$relpath/$file"
15 itemcnt=$(($itemcnt+1))
16 if [ $exactmode != 0 ]; then
17 # 1st argument represent zip folder
18 # 2nd argument represent install folder
19 # differs with copy order !
20 add_item "$setupdir$relpath/$file" "$relpath/$file" $isdir
21 fi
22 else
23 echo "unknown single file: $dir/$file"
24 fi
25 fi
如果单个文件项位于新目录，则新增文件项；如果位于旧目录，则删除：
- 1-8：计算单个文件项在旧目录的相对路径，如果结果不为空，表示文件项位于旧目录，否则位于新目录。删除文件的工作交由 delete_item 函数完成，其实就是在配置文件中加入一条删除记录：
bash;gutter:true;collapse:false
{
"type" : "delete" ,
"target" : "/sdk/QProfile.txt"
},</p>
<pre><code>
如果是单独的目录，则递归删除整个目录：
;gutter:true;collapse:false
{
"type" : "delete_dir" ,
"target" : "/Share/ViewCoreResources/MaterialLibrary/textures/rainTextures"
},
删除项是否添加是和 exact 模式无关的，因为目录的递归覆盖只能添加或替换文件，不能删除。
- 10-21：计算单个文件项在新目录的相对路径，此时结果一般是不为空的，调用 copy_file 函数复制新文件项到输出目录。当用户选择 exact 模式时，在配置文件中加入一条增加记录 (通过 add_item)：
bash;gutter:true;collapse:false
{
"type" : "add" ,
"target" : "/Teigha/GripPoints_20.8src_14.tx" ,
"source" : "setup/Teigha/GripPoints_20.8src_14.tx"
},</p>
<pre><code>
如果是单独的目录，则递归增加整个目录：
;gutter:true;collapse:false
{
"type" : "add_dir" ,
"target" : "//Libraries" ,
"source" : "setup//Libraries"
},
copy_file 通过给 cp 传递 -r 选项，可以很好的支持目录的递归拷贝。
生成配置文件
处理完各个文件和子目录以后，就可以生成升级需要的配置文件啦：
1 # remove temporary files
2 if [ $verbose -eq 0 ]; then
3 # only remove temporary files
4 # when not in verbose mode
5 rm "$srcasm"
6 rm "$dstasm"
7 rm "$dirdiff"
8 fi
9
10 if [ $itemcnt -eq 0 ]; then
11 echo "no item add/replace/delete found, stop generating..."
12 exit 1
13 fi
14
15 if [ $exactmode -eq 0 ]; then
16 # not exact mode
17 # add setup dir totally
18 if [ -z "$reldir" ]; then
19 jsonitem=$(echo " {\n"\
20 " \"type\": \"add_dir\",\n"\
21 " \"target\": \".\",\n"\
22 " \"source\": \"$setupdir\"\n"\
23 " }")
24 else
25 jsonitem=$(echo " {\n"\
26 " \"type\": \"add_dir\",\n"\
27 " \"target\": \"$reldir\",\n"\
28 " \"source\": \"$setupdir\"\n"\
29 " }")
30 fi
31
32 if [ $verbose != 0 ]; then
33 echo -e "$jsonitem"
34 fi
35
36 if [ -z "$json" ]; then
37 json="$jsonitem"
38 else
39 json="$json,\n$jsonitem"
40 fi
41 fi
42
43 json="$jsonhead$json$jsontail"
44 echo -e "$json" > "$outdir/upgrade.json"
45 echo "upgrade.json created, $itemcnt items generated"
46 echo -e "$json"
由于之前在处理文件过程中已经将必要的配置信息生成好了，这里的工作其实很简单：
- 2-8：如果指定 verbose 选项，则保留中间文件用于排错，否则删除；
- 10-13：如果经过对比，没有任何差异，或两个目录都是空的，导致输出内容为空，则中止并退出整个打包脚本；
- 15-41：非 exact 模式下，需要添加一条 add_dir 配置来将输出目录中的所有文件递归覆盖到安装目录。如果用户指定了只替换安装目录中的某个子目录，这里需要调整一下目标路径(line 24-30)；
- 43-46：将各个 json 组装成完整内容并生成到输出目录，名称固定为 “upgrade.json”。
生成压缩包
所有内容就绪后就可以压缩成包上传到后台啦：
1 tarpath="$outdir/*"
2 if [ "${tarpath/:/}" == "$tarpath" ]; then
3 # not contain ':', a relative path
4 # prefix ./ to avoid generate root dir in 7z
5 tarpath="./$tarpath"
6 fi
7
8 $win32/7z a "$setupdir.7z" "$tarpath"
9 resp=$?
10 if [ -z "$setupdir.7z" ]; then
11 echo "compressing failed: $resp"
12 exit 2
13 fi
14
15 mv "$setupdir.7z" "$outdir/$setupdir-$version-$sp.7z"
16 #echo "create 7zip compress packet OK"
17 exit 0
这里没有使用 tar cvzf 来生成 setup.tar.gz 文件，因为升级客户端只能接收 7z 格式的压缩包，这里使用 win32 版本的 7z 命令执行压缩过程。从另外的角度来讲，7z 压缩算法也是目前压缩率最高的算法，可以有效的降低网络传输的流量（7z 压缩率亲测高于 zip 及 gz）。这段代码比较简单，就不展开讲解了，最后会生成下面这样的文件结构：
bash;gutter:false;collapse:false
$ ls -lhrt
total 348M
drwxr-xr-x 1 yunh 1049089 0 11月 17 19:18 setup/
-rw-r--r-- 1 yunh 1049089 147K 11月 17 19:19 upgrade.json
-rw-r--r-- 1 yunh 1049089 348M 11月 17 19:19 setup-1.8.0.0-0.7z</p>
<pre><code>
所有需要添加和替换的文件都会被放在 setup 目录下，这样在递归替换时就可以避免将无关文件（例如 upgrade.json）替换到安装目录。生成的压缩包命名方式为：setup-version-sp.7z。非 exact 模式生成的配置文件内容如下：
;gutter:true;collapse:false
{
"version" : "1.8.0.0" ,
"sp" : "0" ,
"actions" :
[
{
"type" : "delete" ,
"target" : "//BmRecentDocumentPathRecord.xml"
},
{
"type" : "delete" ,
"target" : "/BmWelcomeTemplateFile/小别墅.gbp"
},
{
"type" : "delete" ,
"target" : "/BmWelcomeTemplateFile/小别墅.png"
},
{
"type" : "delete" ,
"target" : "/BmWelcomeTemplateFile/老虎窗屋顶.gbp"
},
{
"type" : "delete" ,
"target" : "/BmWelcomeTemplateFile/老虎窗屋顶.png"
},
{
"type" : "delete" ,
"target" : "/CadIdentifier/DBErrorReport.txt"
},
{
"type" : "delete" ,
"target" : "//GPUDriverConfig.ini"
},
{
"type" : "delete" ,
"target" : "//MjLicense.dll"
},
{
"type" : "delete" ,
"target" : "//MjRichTextEditor.dll"
},
{
"type" : "delete" ,
"target" : "//MjUIArchitecture.dll"
},
{
"type" : "delete" ,
"target" : "//Packing4Rendering.dll"
},
{
"type" : "delete" ,
"target" : "//QProfile.txt"
},
{
"type" : "delete" ,
"target" : "//RecentDocumentPathRecord.xml"
},
{
"type" : "delete" ,
"target" : "//ViewerConfig.ini"
},
{
"type" : "delete" ,
"target" : "//algorithmLog.ini"
},
{
"type" : "delete" ,
"target" : "//gdpcore.1.txt"
},
{
"type" : "delete" ,
"target" : "//gdpcore.txt"
},
{
"type" : "delete" ,
"target" : "/sdk/QProfile.txt"
},
{
"type" : "delete" ,
"target" : "/sdk/ViewerConfig.ini"
},
{
"type" : "delete" ,
"target" : "/sdk/algorithmLog.ini"
},
{
"type" : "add_dir" ,
"target" : "." ,
"source" : "setup"
}
]
}
所有新增及替换操作，全在最后一条 add_dir 配置项了。如果是 exact 模式的话，配置文件就会大很多了，它会针对每个新增、替换项生成一个类似上面删除项的条目，这里就不多做演示了。
用户图形界面
上面的脚本只能通过命令行界面 (CUI) 调用，那能不能将它嵌入到用户图形界面 (GUI) 呢？答案是可以的。
上面这个程序是 真的只做了界面。在获取用户完整输入后，它创建了一个匿名管道 (CreatePipe)，并将管道的一端作为新进程的标准输出 (stdout)、同时用参数构造新进程的命令行 (上面的脚本 diffpacker.sh 作为第一参数) 来启动 bash.exe 进程。当脚本在运行中产生输出时，程序通过匿名管道读取这些输出，并将它们重定向到 UI 底部的输出框，达到实时查看脚本输出的效果。
下载
由于不涉及到后台接口，这个小工具中的脚本、调用到的命令及图形界面源码和可执行程序都是可以完整下载的：https://files.cnblogs.com/files/goodcitizen/diffpacker.zip
有类似需求的同学，改改脚本就可以用啦。其中用到了 msys2，它是一个运行在 windows 上的 bash，我们常用的 git 就使用它作为 git bash 的技术支撑。之前我的不少文章也都涉及过它：
《查看博客园积分与排名趋势图的工具》、《用 shell 脚本做 restful api 接口监控》、《用 shell 脚本做日志清洗》，感兴趣的可以参考一下。
下面是 msys2 的主页，可以从这里获取 Windows 上的安装包：https://www.msys2.org/
后记
这个小工具后来在业务线得到了广泛使用，在某个大产品使用过程中还引发了一次血案，关于该案，我现在给大家梳理一下：
产品组有两个 dll 分别封装了基类 (base.dll) 和派生类 (derived.dll)；有一次产品组为基类添加了两个成员作为补丁版本，在 diff 过程中成功的识别出了 base.dll 被修改，但是没有将 derived.dll 识别出来，然后就这样没有经由本地验证就向外发布了；结果导致打过补丁的版本一启动就崩溃了，原因是 derived.dll 中旧的派生类和 base.dll 中新的基类二进制不兼容了。
后来他们通过紧急补丁修复了上述问题，在后面复盘问题的过程中，我手动检查了脚本的运行日志，发现确实没有识别出新旧 derived.dll —— 脚本认为它们是二进制相同的。后来查询了一些相关资料，了解到我的 dumpbin /disasm 只是反编译了可执行文件中的代码段，而其它一些段 (例如数据段) 则被遗漏了。上面这个例子中，父类的成员变化后，肯定会有相应的 section 会做出调整，但是我通过调整 dumpbin 的选项也没有对比出这个段在哪里。后来尝试使用 msys2 自带的 objdump 命令去反编译，它确实可以得到更丰富的内容，从而判断出新旧 derived.dll 是不同的，但验证同一段相同代码编译两次生成的 dll 进行对比时，它仍然会告诉我两个 dll 不同！所以我不能简单的使用 objdump 替换 dumpbin，因为如果它报告所有 dll 都不同的话，这实际上就没有意义了。最后，这段代码还是带着 bug 继续”上岗”了，产品组现在多了一个心眼儿，每次生成 patch 后都会亲自做一下验证。
这个故事从侧面说明之前产品组对我的工具的信任程度 —— 那是毫无保留信任啊，哈哈。然而我做这个小工具花了多长时间呢？其实也就一周左右，而且有很多时间是花费在调试 windows 与 shell 的一些不兼容之处，真正写业务代码也就不到一周。如果换作用 c++ 来写呢，我恐怕没有一个月是搞不定的了，这就是使用现成组件”搭积木”带来的效率优势。而 shell 作为各个命令之间的粘合剂，为实现这种装配式的开发提供了必要的支撑。现在回头来看 linux 的设计哲学 —— “有众多单一目的的小程序，一个程序只实现一个功能，多个程序组合完成复杂任务” —— 的的确确是一个法宝啊。
Original: https://www.cnblogs.com/goodcitizen/p/compare_two_dir_and_generate_patch_package_by_shell_scripts.html
Author: goodcitizen
Title: 使用 shell 脚本自动对比两个安装目录并生成差异补丁包
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