應用 UFS snapshot 進行比對 /etc 及 /usr/local/etc 下的檔案內容

1. 這隻程式運作的前提是已經完成 UFS snapshot 並且已經正常掛載. 沒有掛載 snapshot 只會看到出現很多找不到檔案的訊息.

2. 程式碼

#!/usr/local/bin/bash

PATH=$PATH
CHKPARA=0

if [ -n "$1" ]; then
        CHKPATH="$1"
        shift
else
        CHKPARA=1
fi

if [ -n "$1" ]; then
        SSKEYWORD="$1"
        shift
else
        CHKPARA=1
fi

if [ -n "$1" ]; then
        SSBASE="$1"
        shift
else
        CHKPARA=1
fi

if [ $CHKPARA -eq 1 ]; then
        echo "Usage: $0 check_path snapshot_keyword snapshot_base_path"
        echo "Example: $0 /etc Weekly /SNAPSHOT/System"
        exit 1
else
        echo "Collect difference between $CHKPATH and $SSBASE/${SSKEYWORD}*$CHKPATH."
fi

date +"%Y/%m/%d %H:%M:%S"
LAST_DIR="/"
CHKPATH=`echo $CHKPATH | sed -e 's/\///'`

for CONF in `find $LAST_DIR$CHKPATH -type f -name '*'`
do
        if [ `ls $SSBASE | grep ${SSKEYWORD} |wc -l` -lt 1 ]; then
                echo "$SSBASE/${SSKEYWORD}* does not existed!"
                exit 1
        fi
        ls -d $SSBASE/${SSKEYWORD}* | while read DIR
        do
                if [ -f ${LAST_DIR}${CONF} ]&&[ -f ${DIR}${CONF} ]; then
                        if [ $LAST_DIR = "/" ]; then
                                LAST_DIR=""
                        fi
                        DIFFC=`diff ${LAST_DIR}${CONF} ${DIR}${CONF} | wc -l`
                        if [ $DIFFC -gt 0 ]; then
                                echo "[[[ Difference between ${LAST_DIR}${CONF} and ${DIR}${CONF} ]]]"
                                diff ${LAST_DIR}${CONF} ${DIR}${CONF}
                                echo ""
                        fi
                        DIFFC=0
                else
                        if [ ! -f ${LAST_DIR}${CONF} ]; then
                                echo "File ${LAST_DIR}${CONF} does not existed."
                        fi
                fi

                LAST_DIR=$DIR
        done
done
echo ""
date +"%Y/%m/%d %H:%M:%S"

3. 使用範例

/PATH/TO/CHK_ETC_diff.sh /PATH/TO/SRC SNAPSHOT_KEYWORD /PATH/TO/SNAPSHOT_ROOT