Script to merge configuration file

 

目地:

把一个配置文件里面的配置项拷贝到另一个配置文件中。

 

前提要求:

两个配置文件基本相同, 文件名相同, 主要用在软件升级的情况下, 新版本的配置文件和老版本的配置文件基本相同, 但是可能新增或者删除了部分配置项, 现在需要一个工具把老的配置值拷贝到新的配置文件里面去.

 

 

原来的

/u/XXX/old/a.conf

新的

/u/XXX/new/a.conf

 

结果是

1. 把old/a.conf中的所有配置都carry forword到new/a.conf, 包括

    - old/a.conf和new/a.conf都存在的项 - 覆盖

    - old/a.conf中存在而new/a.conf中不存在的项 - 新增

2. 保留new/a.conf中新增的配置项不动

3. 在old/a.conf中被注释掉的配置, 在new/a.conf中也标记为注释状态

 

 

 

#!/bin/ksh OLD_CONFIG_FILE_DIR=/u/XXX/old NEW_CONFIG_FILE_DIR=/u/XXX/new CONFIG_FILE="1.conf" nawk -F "=" 'BEGIN { print "##########################################################################"; print "# NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE"; print "#"; print "# This file has been updated via FLUSH scripts. Before setting any"; print "# commented-out properties, check the bottom of this file to see if"; print "# that property is already set there."; print "##########################################################################"; } # This section will affect only on old file # After this section, there are 2 properties maps, and 1 properties name-value map: # 1. commentedOutPropertyTbl: keep all commented-out properties name of old file # 2. uncommentedOutPropertyTbl: keep all un-commented-out properties name of old file # 3. propertyTbl: keep all un-commented out properties name-value pair of old file FILENAME == OLDFILE { if ( $0 ~ /^[#][^ ].*[=].*$/ ) { # This will try to find out all commented-out properties in old file # We will make sure these properties will be kept in commented-out too in new file. split( $0, propertySpec, "="); propertyName = substr(propertySpec["1"], 2); # propertyName is property name commentedOutPropertyTbl[propertyName] = ""; } if ( $1 !~ /^[#]/ && $1 !~ /^[ ]*$/ ) { # This will try to find out all un-commented-out properties in old file uncommentedOutPropertyTbl[$1] = ""; # If there is an equal sign buried in the property value if ( NF > 2 ) { firstEqual=index($0,"="); # return of 0 means no equal sign was found if ( firstEqual == 0 ) { propertyTbl[$1] = $2; } else { restOfLine=substr($0, (firstEqual+1)); propertyTbl[$1] = restOfLine; } } else { propertyTbl[$1] = $2; } } next; #otherwise, the row will be executed for bellow 4 line command. } # Here begin handle with new file { if ( $1 ~ /^[#]/ || $1 ~ /^[ ]*$/ ) { # print out the original content of commented-out lines and blank lines of new file print; next; } else { # handle with property definition line firstchar = ""; if ( $1 in commentedOutPropertyTbl && $1 in uncommentedOutPropertyTbl == false ) { # if the property in old file is commented-out, # it will also be commented-out in new file. firstchar = "#"; } if ( $1 in propertyTbl ) { # the property has been defined in old file, the property value defined in old file # should be ported into new file. if ( length(propertyTbl[$1]) == 0 ) { print firstchar $1 "=" $2; usedProperties[$1] = ""; } else { print firstchar $1 "=" propertyTbl[$1]; usedProperties[$1] = ""; } } else { # the property has not been defined in old file, in other words, it is new added # property in new file, so keep the new file value. print firstchar $1 "=" $2; } next; } } END { # Now dump out those properties which were uncommented by the user # after new spa was installed. print "##########################################################################"; print "# ADDED BY FLUSH SCRIPTS " print "# " print "##########################################################################"; for ( prop in propertyTbl ) { # for all properties defined in old file if ( prop in usedProperties ) { # if the property has redefined in new file, here do nothing } else { # if the property is defined in old file, but not defined in new file, # in other words, the property is removed from new file, we forward the # old property definition to new file, and just keep there. print prop "=" propertyTbl[prop]; } } } ' OLDFILE=${OLD_CONFIG_FILE_DIR}/${CONFIG_FILE} NEWFILE=${NEW_CONFIG_FILE_DIR}/${CONFIG_FILE} ${OLD_CONFIG_FILE_DIR}/${CONFIG_FILE} ${NEW_CONFIG_FILE_DIR}/${CONFIG_FILE}

 

 

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