20. sget

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 sget
# Program to check out the file from CVS read-only

# 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/symbolic_tag_name] <file/directory name> "
        print "The options -r are optional "
        print "For example - "
        print " $cmdname -r 1.1 foo.cpp"
        print " $cmdname foo.cpp "
        print " $cmdname some_directory "
        print "Extract by symbolic revision tag like - "
        print " $cmdname -r REVISION_1 some_directory "
        print " "
        exit
}

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

#echo FLAG1 = $FLAG1 , OARG1 = $OARG1

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

bkextn=sget_bak

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

cur_dir=`pwd`
#echo $cur_dir

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

subdir=` echo $cur_dir | cut -b $len-2000 `
#echo "subdir is : " $subdir
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

# Check if file already exists....
if [ -f "$HOME/$subdir/$fname" ]; then
        tmpaa="$HOME/$subdir/$fname"
        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 should either backup, scommit or delete the file and"
                print "       try $cmdname again\n"
                exit
        fi
fi

# Move the file
mkdir -p "$HOME/$subdir"
touch "$HOME/$subdir/$fname" 2>/dev/null
\mv -f "$HOME/$subdir/$fname" "$HOME/$subdir/$fname.$bkextn"

# Create subshell
(
        cd $homedir

        # Use -A option to clear all sticky flags
        if [ "$FLAG1" = "" ]; then
                if [ "$subdir" = "." ]; then  # don't use dot, will mess up cvs
                        cvs -r checkout -A $fname
                else
                        cvs -r checkout -A "$subdir/$fname"
                fi
        else
                if [ "$subdir" = "." ]; then  # don't use dot, will mess up cvs
                        cvs -r checkout -A -$FLAG1 $OARG1 $fname
                else
                        cvs -r checkout -A -$FLAG1 $OARG1 "$subdir/$fname"
                fi
        fi
)
#pwd

if [ -f "$HOME/$subdir/$fname" ]; then
        print "\nREAD-ONLY copy of the file $subdir/$fname obtained."
        print "Done $cmdname"
        #print "\nTip (Usage): $cmdname <file/directory name> \n"
fi