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21. sedit

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

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


#!/bin/ksh

# CVS program sedit
# Program to check out the file from CVS read/write mode with locking

# 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`

Usage()
{
#       print "\nUsage: $cmdname [-r revision_number] [-F] <filename>"
#       print "The options -r, -F are optional "
#       print "The option -F is FORCE edit even if file is "
#       print "locked by another developer"

        print "\nUsage: $cmdname [-r revision_number] <filename>"
        print "The options -r are optional "

        print "For example - "
        print " $cmdname -r 1.1 foo.cpp"
        print " $cmdname foo.cpp "
#       print " $cmdname -F foo.cpp "
        print " "
}

# Command getopt will not supported in next major release.
# Use getopts instead.
#while getopts r:F ii
while getopts r: ii
do
        case $ii in
        r) FLAG1=$ii; OARG1="$OPTARG";;
#       F) FLAG2=$ii; OARG2="$OPTARG";;
        ?) Usage; exit 2;;
        esac
done
shift ` expr $OPTIND - 1 `

#echo FLAG1 = $FLAG1 , OARG1 = $OARG1

if [ $# -lt 1 ]; then
        Usage
        exit
fi

homedir=` echo $HOME | cut -f1 -d' '  `
if [ "$homedir" = "" ]; then
        print "\nError: \$HOME is not set!!\n"
        exit
fi

bkextn=sedit_bak

cur_dir=`pwd`
#echo $cur_dir

len=${#homedir}
len=$(($len + 2))
#echo $len

subdir=` echo $cur_dir | cut -b $len-2000 `
tmpaa=`dirname $1`
if [ "$tmpaa" = "." ]; then
        fname=$1
        if [ "$subdir" = "" ]; then
                subdir=$tmpaa
        fi
else
        fname=`basename $1`
        if [ "$subdir" = "" ]; then
                subdir=$tmpaa
        else
                subdir="$subdir/$tmpaa"
        fi
fi
#echo "subdir is : " $subdir
#echo "fname is : " $fname

# If file is already checked out by another developer....
cvs_root=` echo $CVSROOT | cut -f1 -d' '  `
if [ "$cvs_root" = "" ]; then
        print "\nError: \$CVSROOT is not set!!\n"
        exit
fi
mkdir -p "$CVSROOT/$subdir/Locks" 2>/dev/null

if [ ! -e "$CVSROOT/$subdir/$fname,v" ]; then
        print "\nError: File $fname does not exist in CVS repository!!\n"
        exit
fi

# CVS directory in your local directory is required for all commands..
if [ ! -d  "$homedir/$subdir/CVS" ]; then
        tmpaa=` (cd "$CVSROOT/$subdir"; find * -prune -type f -print | head -1 ) `
        tmpbb=`basename $tmpaa | cut -d',' -f1 `
        if [ "$tmpaa" = "" -o ! -f "$CVSROOT/$subdir/$tmpbb,v" ]; then
                print "\nThe directory $homedir/$subdir/CVS does not exist"
                print "You must do a sget on `basename $subdir` directory. Give -"
                print "       cd $homedir/`dirname $subdir` "
                print "       sget `basename $subdir` "
                exit
        else
                # Now try to create CVS in local dir by sget
                (
                        cd "$homedir"
                        if [ "$subdir" = "." ]; then  # don't use dot, will mess up cvs
                                cvs -r checkout -A $tmpbb
                        else
                                cvs -r checkout -A "$subdir/$tmpbb"
                        fi
                )
        fi
fi

# Get the tip revision number of the file....
# Use tmpfile as the arg cannot be set inside the sub-shell
tmpfile=$homedir/sedit-lock.tmp
\rm -f $tmpfile 2>/dev/null
if [ "$FLAG1" = "" ]; then
        (
        cd $homedir
                if [ "$subdir" = "." ]; then  # don't use dot, will mess up cvs
                        cvs log $fname | head -6 | grep head: | awk '{print $2}' > $tmpfile
                else
                        cvs log "$subdir/$fname" | head -6 | grep head: | awk '{print $2}' > $tmpfile
                fi
        )
        OARG1=`cat $tmpfile`
        \rm -f $tmpfile 2>/dev/null
fi

lockfile="$CVSROOT/$subdir/Locks/$fname-$OARG1"
#echo "lockfile is : " $lockfile
#if [ -e $lockfile -a "$FLAG2" = "" ]; then
if [ -e $lockfile ]; then
        print "\nError: File $fname Revision $OARG1 already locked by another developer !!"
        aa=` ls -l $lockfile | awk '{print "Locking developers unix login name is = " $3}' `
        print $aa
        print "That developer should do scommit OR sunlock to release the lock"
        print " "
#       print "You can also use -F option to force edit the file even if"
#       print "the file is locked by another developer. But you must talk to"
#       print "other developer to work concurrently on this file."
#       print "For example - this option is useful if you work on a seperate"
#       print "C++ function in the file which does not interfere with other"
#       print "developer."
#       print " "
        exit
fi

# Get read-only copy now....
if [ ! -e "$HOME/$subdir/$fname" ]; then
        (
        cd $homedir
                if [ "$subdir" = "." ]; then  # don't use dot, will mess up cvs
                        cvs -r checkout $fname 1>/dev/null
                else
                        cvs -r checkout "$subdir/$fname" 1>/dev/null
                fi
        )
fi

# Check if file already exists....
tmpaa="$HOME/$subdir/$fname"
if [ -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
                print "\nError: The file is writable. Aborting $cmdname ......"
                print "       You must backup, scommit or delete file and"
                print "       try $cmdname again\n"
                exit
        fi
        #print "\nNote: The file $tmpaa is read-only."
        #print "Hence I am moving it to $tmpaa.$bkextn ....\n"
        \mv -f $tmpaa $tmpaa.$bkextn
        chmod 444 $tmpaa.$bkextn
elif [ -d $tmpaa ]; then
        print "\nError: $tmpaa is a directory and NOT a file. Aborting $cmdname ....\n"
        exit
fi

# Create subshell
print "\nNow getting the file $fname from CVS repository ...\n"
(
        cd $homedir
        # Use -A option to clear the sticky tag and to get
        # the HEAD revision version
        if [ "$FLAG1" = "" ]; then
                if [ "$subdir" = "." ]; then  # don't use dot, will mess up cvs
                        cvs -w checkout -A $fname
                else
                        cvs -w checkout -A "$subdir/$fname"
                fi
        else
                if [ "$subdir" = "." ]; then  # don't use dot, will mess up cvs
                        cvs -w checkout -A -$FLAG1 $OARG1 $fname
                else
                        cvs -w checkout -A -$FLAG1 $OARG1 "$subdir/$fname"
                fi
        fi
)

if [ -e "$HOME/$subdir/$fname" ]; then
        # The lockfile is $CVSROOT/$subdir/Locks/$fname-$OARG1
        touch $lockfile
        if [ -e $lockfile ]; then
                print "\nDone $cmdname"
        else
                print "\nFatal Error: File $fname Revision $OARG1 not locked !!"
                print "\nCheck the reason for this failure.. before proceeding..."
        fi
fi

#pwd

#print "\nTip (Usage): $cmdname <filename> \n"


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