23. supdate

NOTE : Get the Korn shell /bin/ksh by installing pdksh*.rpm from the Linux contrib cdrom

Save this file as a text file and chmod a+rx on it.

#!/bin/ksh

# CVS program supdate
# Program to update the file from CVS read/write mode

# Every filename is composed of 3 parts - Home directory, sub-directory 
# and the filename. The full-path is $HOME/$subdir/$fname
# And in CVS the same directory structure is maintained (by 
# variable $subdir) therefore in cvs we will have $CVSROOT/$subdir/$fname
# In this program these 4 variables $HOME, $CVSROOT, $subdir and $fname
# play an important role. For example, sample values can be like
# HOME=/home/aldev, subdir=myproject/src CVSROOT=/home/cvsroot 
# and fname=foo.cpp

# Caution: Put double-quotes to protect the variables having 
#          spaces, like "$HOME/$subdir" if subdir is 'some foo.cpp'

cmdname=`basename $0`

if [ $# -lt 1 ]; then
        print "\nUsage: $cmdname <filename>"
        exit
fi

# Put double quotes to protect spaces in $1
tmpaa="$1"

# Check if file already exists....
if [ $# -gt 0 -a  -f $tmpaa ]; then
        user_perms=" "
        group_perms=" "
        other_perms=" "
        user_perms=`ls -l $tmpaa | awk '{print $tmpaa }' | cut -b3-3 `
        group_perms=`ls -l $tmpaa | awk '{print $tmpaa }' | cut -b6-6 `
        other_perms=`ls -l $tmpaa | awk '{print $tmpaa }' | cut -b9-9 `
        if [ "$user_perms" = "w" -o "$group_perms" = "w"  \
                        -o "$other_perms" = "w" ]; then
                while :
                do
                        print "\n$cmdname will backup your working file "
                        print "$tmpaa to $tmpaa.supdate_bak before doing any merges."
                        print "Are you sure you want the merge the changes from"
                        print -n "CVS repository to your working file ? <y/n> [n]: "
                        read ans
                        if [ "$ans" = "y" -o "$ans" = "Y" ]; then
                                if [ -f $tmpaa.supdate_bak ]; then
                                        print "\nWarning : File $tmpaa.supdate_bak already exists!!"
                                        print "Please examine the file $tmpaa.supdate_bak and delete it"
                                        print "and then re-try this $cmdname "
                                        print "Aborting $cmdname ...."
                                        exit
                                else
                                        cp $tmpaa $tmpaa.supdate_bak
                                        break
                                fi
                        elif [ "$ans" = "n" -o "$ans" = "N" -o "$ans" = "" -o "$ans" = " " ]; then
                                exit
                        fi
                done
        fi
fi

if [ -d $tmpaa ]; then
        print "\nDirectory update is disabled because cvs update"
        print "merges the changes from repository to your working directory."
        print "Hence give the filename to update - as shown below: "
        print " Usage: $cmdname <filename>"
        exit
#       cvs update
else
        cvs update $tmpaa
fi

print "\nDone $cmdname. $cmdname successful"
print "\n\nThe original file is backed-up to $tmpaa.supdate_bak"
print "\nHence your original file is SAVED to $tmpaa.supdate_bak"
print "\n\n"
#print "\nTip (Usage): $cmdname <filename/directory name>\n"