merge script to be run by xdcp to support the MERGE function, more testing needed

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@13344 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-server/share/xcat/scripts/xdcpmerge.sh

@@ -0,0 +1,105 @@
+#!/bin/sh
+# This script is used by the xdcp MERGE: function to perform the
+# merge operation on the nodes for the /etc/passwd, /etc/shadow and 
+# and /etc/group files. These are the only supported files for merge.
+# The MERGE function is also only supported on Linux.
+#First parameter is nodesyncfiledir
+#The next parameter is the MERGE clause put in the following format   
+#mergefile1:currfile1 mergefile2:currfile2.....
+#For example:
+#/tmp/myusers:/etc/passwd /tmp/mypasswds:/etc/shadow /tmp/mygrps:/etc/group
+#
+#this is the base path to the merge directory
+logger -t xCAT "xdcp merge started"
+nodesyncfiledir=$1
+#this is the backup copy of the original current file 
+nodesyncfiledirorg="$nodesyncfiledir/org"
+#this is the path to merge working files
+nodesyncfiledirmerge="$nodesyncfiledir/merge"
+#this is the path to the files containing the merge data
+nodesynfiledirmergefiles="$nodesyncfiledir/merge/mergefiles"
+skip=0
+# for each input parameter
+for i in $*; do
+  # skip first parm
+  if [ $skip -eq 0 ]; then
+    skip=1
+    continue
+  fi
+  # get the merge file path and name, for example /tmp/myusers
+  mergefilename=`echo "$i"|cut -d ':' -f 1`
+  # get location on the node
+  mergefile="$nodesynfiledirmergefiles$mergefilename"
+  # get the file path and name to merge into, for example /etc/passwd
+  curfile=`echo "$i"|cut -d ':' -f 2`
+
+  # if curfile not /etc/passwd  or /etc/shadow or /etc/group 
+  # exit error
+  #if [ "$curfile" != "/etc/passwd" ] && [ "$curfile" != "/etc/shadow" ] && [ "$curfile" != "/etc/group" ]; then
+  #  `logger -t xCAT -p local4.err "Merge: $curfile is not /etc/passwd or /etc/shadow or /etc/group. It cannot be processes." `
+  #   exit 1
+  #fi 
+  # get the directory to backup the original file  
+  curfiledir=`dirname $curfile`
+  curfilename=`basename $curfile`
+  filebackupdir="$nodesyncfiledirorg$curfiledir"
+  # name of the path to the backup of original file
+  filebackup="$nodesyncfiledirorg$curfile"
+  # now do the work
+  # make the necessary directories
+  mkdir -p $filebackupdir 
+  # copy current to  backup 
+  cp -p $curfile $filebackup
+
+  # Go though the backup copy and remove duplicate lines that  are
+  # in the merge file and create a new backup 
+  # first get a list of  duplicate lines to remove 
+  # based on only username:  the first field in the file
+ cut -d: -f1 $filebackup > $filebackup.userlist
+ cut -d: -f1 $mergefile > $mergefile.userlist
+  comm -12 <(sort $filebackup.userlist | uniq) <(sort $mergefile.userlist | uniq) > $filebackup.remove
+ 
+  # now if there is a remove file,  use it to remove the dup lines in backup 
+  # Need to buit a command like the following with all users 
+  #grep -v -E ^(root|bin|...) $filebackup > $filebackup.nodups 
+  if [ -s "$filebackup.remove" ]; then
+    grepcmd="grep -v -E " 
+    removeusers=`cat $filebackup.remove`
+    startlist="'^("
+    userlist=$startlist
+    delim="|"
+    for u in $removeusers
+    do
+      userlist=$userlist$u$delim
+    done
+    # remove the last delimiter
+    userlisttmp="${userlist%?}"
+    listend=")'"
+    userlist=$userlisttmp$listend
+    grepcmd=$grepcmd$userlist
+    #set -x
+    grepcmd="$grepcmd $filebackup > $filebackup.nodups"
+    #echo "grepcmd=$grepcmd"
+    # now run it
+    eval $grepcmd
+    # if no dups file created
+    if [ -s "$filebackup.nodups" ]; then
+      cp -p $filebackup.nodups $filebackup
+      #echo "cp -p $filebackup.nodups $filebackup" 
+      rm $filebackup.nodups
+    fi 
+  fi 
+  # Now update the currentfile  
+  cat $filebackup $mergefile > $curfile
+  #echo "cat $filebackup $mergefile > $curfile"
+  # now cleanup
+  rm $filebackup.userlist 
+  #  echo "rm $filebackup.userlist"
+  rm $filebackup.remove 
+  #  echo "rm $filebackup.remove"
+  rm $mergefile.userlist 
+  #  echo "rm $mergefile.userlist"
+   
+done
+logger -t xCAT "xdcp merge complete"
+exit 0